R1224N332F-TR-FE - RICOH SEMICONDUCTOR

R1224N SERIES

PWM/VFM step-down DC/DC Controller

NO.EA-096-160524

OUTLINE

The R1224N Series are CMOS-based PWM step-down DC/DC Converter controllers with low supply current.

Each of these ICs consists of an oscillator, a PWM control circuit, a reference voltage unit, an error amplifier, a

phase compensation circuit, a soft-start circuit, a protection circuit, a PWM/VFM alternative circuit, a chip enable

circuit, resistors for output voltage detect, and input voltage detect circuit. A low ripple, high efficiency step-down

DC/DC converter can be easily composed of this IC with only several external components, or a power-transistor,

an inductor, a diode and capacitors. Output Voltage is fixed or can be adjusted with external resistors (Adjustable

types are without PWM/VFM alternative circuit).

With a PWM/VFM alternative circuit, when the load current is small, the operation is automatically switching

into the VFM oscillator from PWM oscillator. Therefore, the efficiency at small load current is improved. Several

types of the R1224Nxxx, which are without a PWM/VFM alternative circuit, are also available.

If the term of maximum duty cycle keeps on a certain time, the embedded protection circuit works. The

protection circuit is Reset-type protection circuit, and it works to restart the operation with soft-start and repeat

this operation until maximum duty cycle condition is released. When the cause of large load current or something

else is removed, the operation is automatically released and returns to normal operation. Further, built-in UVLO

function works when the input voltage is equal or less than UVLO threshold, it makes this IC be standby and

suppresses the consumption current and avoid an unstable operation.

FEATURES

 Supply Current ................................................................ Typ. 20A (R1224Nxx2E/F/M/L, R1224N102M)

Typ. 30A (R1224Nxx2G, R1224N102G)

Typ. 40A (R1224Nxx2H, R1224N102H)

 Standby Current .............................................................. Typ. 0A

 Input Voltage Range ....................................................... 2.3V to 18.5V

 Output Voltage Range ..................................................... 1.2V to 6.0V (0.1V steps; R1224Nxx2x)

1.0V to VIN (R1224N102x)

 Output Voltage Accuracy ................................................. 2.0%

 Oscillator Frequency ....................................................... Typ. 180kHz (R1224Nxx2L/M, R1224N102M)

Typ. 300kHz (R1224Nxx2E/G, R1224N102G)

Typ. 500kHz (R1224Nxx2F/H, R1224N102H)

 Efficiency ......................................................................... Typ. 90%

 Low Temperature-Drift Coefficient of Output Voltage...... Typ. 100ppm/°C

 Package .......................................................................... SOT-23-5

 Built-in Soft-start Func tion ............................................... Typ. 10ms

 Built-in Current Limit Circuit

APPLICATIONS

 Power source for hand-held communication equipment, cameras, video instruments such as VCRs,

camcorders.

 Power source for battery-powered equipment.

 Power source for household electrical appliances.

R1224N

BLOCK DIAGRAM

Fixed Output Voltage Type

OSC

Amp

Vref

OUT

EXT

GND

PWM/VFM

CONTROL Soft Start

Protection Chip Enable

UVLO

Adjust able Output Voltage Type

OSC

Amp

Vref

EXT

GND

Soft Start

Protection Chip Enable

UVLO

R1224N

SELECTION GUIDE

The output voltage, the oscillator frequency, the modulation method and the output voltage adjustment for the

ICs can be selected at the user’s request.

Product Name Package Quantity per Reel Pb Free Halogen Free

R1224Nxx2-TR-FE SOT-23-5 3,000 pcs Yes Yes

xx : The output voltage can be designated in the range from 1.2V(12) to 6.0V(60) in 0.1V steps.

(For externally adjustable output voltage type, feedback voltage of 1.0V(10).)

 : The oscillator frequency, the modulation method and the output voltage adjustment are options as follows.

Code Oscillator frequency PWM/VFM

alternative circuit Output voltage

adjustment

E 300kHz Yes No

F 500kHz Yes No

G 300kHz No Yes

H 500kHz No Yes

L 180kHz Yes No

M 180kHz No Yes

PIN CONFIGURATION

 SOT-23-5

123

(mark side)

PIN DESCRIPTION

Pin No Symbol Pin Description

1 CE Chip Enable Pin ("H" Active)

2 GND Ground Pin

3 VOUT (VFB) Pin for Monitoring Output Voltage (Feedback Voltage)

4 EXT External Transistor Drive Pin (CMOS Output)

5 VIN Power Supply Pin



R1224N

ABSOLUTE MAXIMUM RATINGS GND=0V

Symbol Item Rating Unit

VIN VIN Supply Voltage 0.3 to 20 V

VEXT EXT Pin Output Voltage 0.3 to VIN0.3 V

VCE CE Pin Input Voltage 0.3 to VIN0.3 V

VOUT/VFB VOUT/VFB Pin Input Voltage 0.3 to VIN0.3 V

IEXT EXT Pin Inductor Drive Output Current  50 mA

PD Power Dissipation (SOT-23-5) 420 mW

Topt Operating Temperature Range 40 to 85 C

Tstg Storage Temperature Range 55 to 125 C



) For Power Dissipation, please refer to PACKAGE INFORMATION.

ABSOLUTE MAXIMUM RATINGS

Electronic and mechanical stress momentarily exceeded absolute maximum ratings may cause the

permanent damages and may degrade the life time and safety for both device and system using the device

in the field.

The functional operation at or over these absolute maximum ratings is not assured.

R1224N

ELECTRICAL CHARACTERISTICS

 R1224Nxx2x (x=E/F/G/H/L/M) except R1224N102x Topt=25C

Symbol Item Conditions Min. Typ. Max. Unit

VIN Operating Input Voltage 2.3 18.5 V

VOUT Step-down Output Voltage VIN



VCE



VSET



1.5V, IOUT





100mA

When VSET≤1.5V, VINVCE3.0V

VSET

0.98 VSET VSET

1.02 V

VOUT/

Topt

Step-down Output Voltage

Temperature Coefficient 40°C≤Topt≤85°C 100 ppm/°C

fosc Oscillator Frequency

VINVCEVSET1.5V, IOUT100mA

L/M Version

E/G Version

F/H Version

144

240

400

180

300

500

216

360

600

kHz

fosc/

Topt

Oscillator Frequency

Temperature Coefficient 40°C≤Topt≤85°C 0.2 %/°C

IDD1 Supply Current 1

VIN



VCE



VOUT



18.5V

E/F/L/M Version

G version

H version

A

Istandby Standby Current VIN18.5V, VCE0V, VOUT0V 0 0.5

A

IEXTH EXT "H" Output Current VIN



8V, VEXT



7.9V, VOUT



8V,

VCE8V 17 10 mA

IEXTL EXT "L" Output Current VIN



8V, VEXT



0.1V, VOUT



0V,

VCE8V 20 30 mA

ICEH CE "H" Input Current VINVCEVOUT18.5V 0 0.5

A

ICEL CE "L" Input Current VINVOUT18.5V, VCE0V 0.5 0

A

VCEH CE "H" Input Voltage VIN8V, IOUT10mA 1.5 V

VCEL CE "L" Input Voltage VIN8V, IOUT10mA 0.3 V

Maxduty Oscillator Maximum

Duty Cycle 100 %

VFMdty VFM Duty Cycle E/F/L Version 35 %

VUVLO1 UVLO Voltage VINVCE2.5V to 1.5V, VOUT0V 1.8 2.0 2.2 V

VUVLO2 UVLO Release Voltage VINVCE1.5V to 2.5V, VOUT0V VUVLO1

0.1 2.3 V

tstart Delay Time by Soft-Start function VIN



VSET



1.5V, IOUT





10mA

VCE0VVSET1.5V 5 10 20 ms

tprot Delay Time for protection circuit VIN



VCE



VSET



1.5V

VOUTVSET1.5V0V 5 15 30 ms

RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)

All of electronic equipment should be designed that the mounted semiconductor devices operate within the

recommended operating conditions. The semiconductor devices cannot operate normally over the

recommended operating conditions, even if when they are used over such conditions by momentary

electronic noise or surge. And the semiconductor devices may receive serious damage when they continue

to operate over the recommended operating conditions.

R1224N

 R1224N102x (x=G/H/M) Topt=25C

Symbol Item Conditions Min. Typ. Max. Unit

VIN Operating Input Voltage 2.3 18.5 V

VFB Feedback Voltage VINVCE3.0V, IOUT100mA 0.98 1.00 1.02 V

VFB/

Topt

Feedback Voltage

Temperature Coefficient 40°C≤Topt≤85°C 100 ppm/°C

fosc Oscillator Frequency

VIN



VCE



2.5V, IOUT





100mA

M Version

G Version

H Version

144

240

400

180

300

500

216

360

600

kHz

fosc/

Topt

Oscillator Frequency

Temperature Coefficient 40°C≤Topt≤85°C 0.2 %/°C

IDD1 Supply Current 1

VIN



VCE



VFB



18.5V

M Version

G Version

H Version

A

Istandby Standby Current VIN18.5V, VCE0V, VFB0V 0 0.5

A

IEXTH EXT "H" Output Current VIN



8V, VEXT



7.9V, VFB



8V,

VCE8V 17 10 mA

IEXTL EXT "L" Output Current VIN



8V, VEXT



0.1V, VFB



0V,

VCE8V 20 30 mA

ICEH CE "H" Input Current VINVCEVFB18.5V 0 0.5

A

ICEL CE "L" Input Current VINVFB18.5V, VCE0V 0.5 0

A

VCEH CE "H" Input Voltage VIN8V, IOUT10mA 1.5 V

VCEL CE "L" Input Voltage VIN8V, IOUT10mA 0.3 V

Maxduty Oscillator Maximum Duty Cycle 100 %

VUVLO1 UVLO Voltage VINVCE2.5V to 1.5V, VFB0V 1.8 2.0 2.2 V

VUVLO2 UVLO Release Voltage VINVCE1.5V to 2.5V, VFB0V VUVLO1

0.1 2.3 V

tstart Delay Time by Soft-Start function VIN



2.5V, IOUT





10mA

VCE0V2.5V 5 10 20 ms

tprot Delay Time for protection circuit VIN



VCE



2.5V

VFB2.5V0V 5 15 30 ms

RECOMMENDED OPERATING CONDITIONS (ELECTRICAL CHARACTERISTICS)

All of electronic equipment should be designed that the mounted semiconductor devices operate within the

recommended operating conditions. The semiconductor devices cannot operate normally over the

recommended operating conditions, even if when they are used over such conditions by momentary

electronic noise or surge. And the semiconductor devices may receive serious damage when they continue

to operate over the recommended operating conditions.

R1224N

TYPICAL APPLICATION AND APPLICATION HINTS

(1) Fixed Output Voltage Type (R1224Nxx2E/F/G/H/L/M excep t xx=10)

CE CONTROL

R1224N

EXT

GND

OUT

CE C3

LOAD

PMOS

PMOS: uPA1914 (Renesas) L : CR105NP-270MC (Sumida, 27H)

SD1 : CMS06 (TOSHIBA) C3 : 47F (Tantalum Type)

C1 : 10F (Ceramic Type) C2 : 0.1F (Ceramic Type)

R1 : 10

(2) Adjustable Output Type (R12 24N102G/H/M) Example: Output Voltage=3.2V

CE CONTROL

LOAD

PMOS

R1224N

EXT

GND

PMOS: uPA1914 (Renesas) L : CR105NP-270MC (Sumida, 27H)

SD1 : CMS06 (TOSHIBA) C3 : 47F (Tantalum Type)

C1 : 10F (Ceramic Type) C2 : 0.1F (Ceramic Type) C4: 1000pF (Ceramic Type)

R1 : 10, R2=22k, R3=2.7k, R4=33k

R1224N

When you use these ICs, consider the following issues;

As shown in the block diagram, a parasitic diode is formed in each terminal, each of these diodes is not formed

for load current, therefore do not use it in such a way. When you control the CE pin by another power supply, do

not make its “H” level more than the voltage level of VIN pin.

Set external components as close as possible to the IC and minimize the connection between the components

and the IC. In particular, a capacitor should be connected to VIN pin with the minimum connection. Make

sufficient ground and reinforce supplying. A large switching current could flow through the connection of power

supply, an inductor and the connection of VIN. If the impedance of the connection of power supply is high, the

voltage level of power supply of the IC fluctuates with the switching current. This may cause unstable operation

of the IC.

Protection circuit may work if the maximum duty cycle continue for the time defined in the electrical

characteristics. Once after stopping the output voltage, output will restart with soft-start operation. If the

difference between input voltage and output voltage is small, the protection circuit may work.

Use capacitors with a capacity of 22F or more for VOUT pin, and with good high frequency characteristics such

as tantalum capacitors. We recommend you to use output capacitors with an allowable voltage at least twice as

much as setting output voltage. This is because there may be a case where a spike-shaped high voltage is

generated by an inductor when an external transistor is on and off.

Choose an inductor that has sufficiently small D.C. resistance and large allowable current and is hard to reach

magnetic saturation. And if the value of inductance of an inductor is extremely small, the ILX may exceed the

absolute maximum rating at the maximum loading.

Use an inductor with appropriate inductance.

Use a diode of a Schottky type with high switching speed, and also pay attention to its current capacity.

Do not use this IC under the condition with VIN voltage at equal or less than minimum operating voltage.

When the threshold level of an external power MOSFET is rather low and the drive-ability of voltage supplier is

small, if the output pin is short circuit, input voltage may be equal or less than UVLO detector threshold. In this

case, the devise is reset with UVLO function that is different from the reset-protection function caused by

maximum duty cycle.

With the PWM/VFM alternative circuit, when the on duty cycle of switching is 35% or less, the R1224N alters

from PWM mode to VFM mode (Pulse skip mode). The purpose of this circuit is raising the efficiency with a light

load by skipping the frequency and suppressing the consumption current. However, the ratio of output voltage

against input voltage is 35% or less, (ex. VIN>8.6V and VOUT=3.0V) even if the large current may be loaded, the

IC keeps its VFM mode. As a result, frequency might be decreased, and oscillation waveform might be unstable.

These phenomena are the typical characteristics of the IC with PWM/VFM alternative circuit.

If the input voltage is equal or more than 6V, R1 and C2 in the typical application are necessary as a VIN filter to

prevent unstable operation.

The performance of power source circuits using these ICs extremely depends upon the peripheral circuits.

Pay attention in the selection of the peripheral circuits. In particular, design the peripheral circuits in a way that

the values such as voltage, current, and power of each component, PCB patterns and the IC do not exceed their

respected rated values.

R1224N

How to Adjust Output Voltage and about Phase Compensation

As for Adjustable Output type, feedback pin (VFB) voltage is controlled to maintain 1.0V.

Output Voltage, VOUT is as following equation:

OUT: R2R4VFB: R2

OUTVFB(R2R4)/R2

Thus, with changing the value of R2 and R4, output voltage can be set in the specified range.

In the DC/DC converter, with the load current and external components such as L and C, phase might be behind

180 degree. In this case, the phase margin of the system will be less and stability will be worse. To prevent this,

phase margin should be secured with proceeding the phase. A pole is formed with external components L and

C3.

C3L1/2 ~ Fpole 

A zero (signal back to zero) is formed with R4 and C4.

Fzero~1/(2R4C4)

For example, if L27H, C347µF, the cut off frequency of the pole is approximately 4.5kHz.

To make the cut off frequency of the pole as much as 4.5kHz, set R433k and C41000pF.

If VOUT is set at 2.5V, R222k is appropriate.

R3 prevents feedback of the noise to VFB pin, about 2.7k is appropriate value.

CE CONTROL

LOAD

PMOS

R1224N

EXT

GND

R1224N

OPERATION of step-down DC/DC converter and Output Current

The step-down DC/DC converter charges energy in the inductor when Lx transistor is ON, and discharges the

energy from the inductor when Lx transistor is OFF and controls with less energy loss, so that a lower output

voltage than the input voltage is obtained. The operation will be explained with reference to the following

diagrams:

IOUT

Lx Tr L

VIN

VOUT

GND



1/fosc

ton toff

topen

ILmin

ILmax

Step 1: Lx Tr. turns on and current IL (=i1) flows, and energy is charged into CL. At this moment, IL increases

from ILmin. (=0) to reach ILmax. in proportion to the on-time period (ton) of Lx Tr.

Step 2: When Lx Tr. turns off, Schottky diode (SD) turns on in order that L maintains IL at ILmax, and current IL

(=i2) flows.

Step 3: IL decreases gradually and reaches ILmin. after a time period of topen, and SD turns off, provided that in

the continuous mode, next cycle starts before IL becomes to 0 because toff time is not enough. In this

case, IL value is from this ILmin (>0).

In the case of PWM control system, the output voltage is maintained by controlling the on-time period (ton), with

the oscillator frequency (fosc) being maintained constant.

Discontinuous Conduction Mode and Continuous Conduction Mode

The maximum value (ILmax) and the minimum value (ILmin) current which flow through the inductor is the

same as those when Lx Tr. is ON and when it is OFF.

The difference between ILmax and ILmin, which is represented by I;

IILmax-ILminVOUTtopen/L(VIN-VOUT)ton/L ................................... Equation 1

wherein, T1/foscton+toff

duty (%)ton/T100tonfosc100

topen









toff

In Equation 1, VOUTtopen/L and (VIN-VOUT)ton/L are respectively shown the change of the current at ON, and

the change of the current at OFF.

When the output current (IOUT) is relatively small, topen<toff as illustrated in the above diagram. In this case, the

energy is charged in the inductor during the time period of ton and is discharged in its entirely during the time

period of toff, therefore ILmin becomes to zero (ILmin=0). When Iout is gradually increased, eventually, topen

becomes to toff (topen=toff), and when IOUT is further increased, ILmin becomes larger than zero (ILmin>0). The

former mode is referred to as the discontinuous mode and the latter mode is referred to as continuous mode.

R1224N

In the continuous mode, when Equation 1 is solved for ton and assumed that the solution is tonc,

toncTVOUT/VIN ..................................................................................... Equation 2

When ton<tonc, the mode is the discontinuous mode, and when tontonc, the mode is the continuous mode.

OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS

When Lx Tr. is ON:

(Wherein, Ripple Current P-P value is described as IRP, ON resistance of Lx Tr. is described as Rp the direct

current of the inductor is described as RL.)

VINVOUT(RpRL)IOUTLIRP/ton ................................................. Equation 3

When Lx Tr. is OFF:

LIRP/toffVFVOUTRLIOUT ............................................................ Equation 4

Put Equation 4 to Equation 3 and solve for ON duty, ton/(toff+ton)DON,

DON(VOUTVFRLIOUT)/(VINVFRpIOUT) ...................................... Equation 5

Ripple Current is as follows;

IRP(VINVOUTRpIOUTRLIOUT)DON/f/L ........................................ Equation 6

Wherein, peak current that flows through L, Lx Tr., and SD is as follows;

ILmaxIOUTIRP/2 ............................................................................ Equation 7

Consider ILmax, condition of input and output and select external components.

The above explanation is directed to the calculation in an ideal case in continuous mode.

R1224N

External Components

1. Inductor

Select an inductor that peak current does not exceed ILmax. If larger current than allowable current flows,

magnetic saturation occurs and make transform efficiency worse.

When the load current is definite, the smaller value of L, the larger the ripple current.

Provided that the allowable current is large in that case and DC current is small, therefore, for large output

current, efficiency is better than using an inductor with a large value of L and vice versa.

2. Diode

Use a diode with low VF (Schottky type is recommended.) and high switching speed.

Reverse voltage rating should be more than VIN and current rating should be equal or more than ILmax.

3. Capacitors

As for CIN, use a capacitor with low ESR (Equivalent Series Resistance) and a capacity of at least 10µF for

stable operation.

COUT can reduce ripple of Output Voltage, therefore 47µF or more value of tantalum type capacitor is

recommended.

4. Lx Transistor

Pch Power MOSFET is required for this IC.

Its breakdown voltage between gate and source should be a few V higher than Input Voltage.

In the case of Input Voltage is low, to turn on MOSFET completely, to use a MOSFET with low threshold

voltage is effective.

If a large load current is necessary for your application and important, choose a MOSFET with low ON

resistance for good efficiency.

If a small load current is mainly necessary for your application, choose a MOSFET with low gate capacity for

good efficiency.

Maximum continuous drain current of MOSFET should be larger than peak current, ILmax.

R1224N

TIMING CHART

OUT

Set Output Voltage

UVLO Voltage

Input Voltage

Rising Time

UVLO Reset

OUT

Set Output Voltage

Protection Circuit Delay Time

OUT

Set Output

Voltage

EXT

OUT

Set Output

Voltage

Stable

Operation

Stable

Operation

Stable

Operation

Soft Start Soft Start Soft Start Soft Start

Reset Protection

The timing chart shown above describes the changing process of input voltage rising, stable operating,

operating with large current, stable operating, input voltage falling, input voltage recovering, and stable

operating.

First, until when the input voltage (VIN) reaches UVLO voltage, the circuit inside keeps the condition of

pre-standby.

Second, after VIN becomes beyond the UVLO threshold, soft-start operation starts, when the soft-start

operation finishes, the operation becomes stable.

If too large current flows through the circuit because of short or other reasons, EXT signal ignores that during

the delay time of protection circuit. (The current value depends on the circuit.)

After the delay time passes, reset protection works, or EXT signal will be “H”, then output will turn off, then

soft-start operation starts. After the soft-start operation, EXT signal will be “L”, but if the large current is still

flowing, after the delay time of protection circuit passes, reset protection circuit will work again, the operation will

be continuously repeated unless the cause of large current flowing is not removed.

Once the cause of the large current flowing is removed, within the delay time, the operation will be back to the

stable one.

If the timing for release the large current is in the protection process, the operation will be back to the normal

one after the soft-start operation.

If the VIN becomes lower than the set VOUT, that situation is same as large current condition, so protection

circuit may be ready to work, therefore, after the delay time of protection circuit, EXT will be “H”.

Further, if the VIN is lower than UVLO voltage, the circuit inside will be stopped by UVLO function.

After that, if VIN rises, until when the VIN reaches UVLO voltage, the circuit inside keeps the condition of

spre-standby.

Then after VIN becomes beyond the UVLO threshold, soft-start operation starts, when the soft-start operation

finishes, the operation becomes stable.

R1224N

TEST CIRCUITS

Output Voltage, Oscillator Frequency, CE “H” Input Voltage, CE “L” Input Voltage, Soft-start time

R1224N

EXT

GND

OUT

PMOS

Oscilloscope

)

Supply Current 1 Standby Current

R1224N

GND

OUT

)

3 1

R1224N

GND

OUT

)

EXT “H” Output Cu rrent EXT “L” Output Current

A R1224N

GND

OUT

)

EXT

3 1

5 4

AR1224N

GND

OUT

)

EXT

5 4

CE “H” Input Current, CE “L” Input Current Output Delay Ti me for Protection Circuit

R1224N

GND

OUT

)

3 1

R1224N

GND

VOUT

VIN

(VFB)

EXT

Oscilloscope

5 4

PMOS : HAT1044M (Hitachi) L : CD104-270MC (Sumida, 27H)

SD1 : RB491D (Rohm)

C1 : 47F (Tantalum Type) C2 : 47F (Tantalum Type)

R1224N

TYPICAL CHARACTERISTICS

1)Output Voltage vs. Output Current (*Note)

R1224N182E L=10µH R1224N182F L=10µH

1.830

1.850

1.810

1.790

1.770

1.750

Output Current l

OUT

(mA)

Output Voltage V

OUT

(V)

0.1 1 10 100 1000 10000

3.3V

1.850

1.770

1.790

1.810

1.830

1.750

Output Voltage V

OUT

(V)

3.3V

Output Current I

OUT

(mA)

0.1 1 10 100001000100

R1224N182G L=10µH R1224N182H L=10µH

1.830

1.850

1.810

1.790

1.770

1.750

Output Current lOUT(mA)

Output Voltage VOUT(V)

0.1 1 10 100 1000 10000

VIN12V

VIN5V

VIN3.3V

1.830

1.850

1.810

1.790

1.770

1.750

Output Current lOUT(mA)

Output Voltage VOUT(V)

0.1 1 10 100 1000 10000

VIN12V

VIN5V

VIN3.3V

R1224N182L L=27µH R1224N182M L=27µH

1.830

1.850

1.810

1.790

1.770

1.750

Output Current l

OUT

(mA)

Output Voltage V

OUT

(V)

0.1 1 10 100 1000 10000

3.3V

1.830

1.850

1.810

1.790

1.770

1.750

Output Current l

OUT

(mA)

Output Voltage V

OUT

(V)

0.1 1 10 100 1000 10000

12V

3.3V

R1224N

R1224N332E L=10µH R1224N332F L=10µH

3.34

3.40

3.30

3.28

3.24

3.20

Output Voltage V

OUT

(V)

0.1 1 10 100 1000 10000

3.38

3.36

3.32

3.26

3.22

Output Current l

OUT

(mA)

4.8V

3.340

3.400

3.300

3.280

3.240

3.200

Output Voltage V

OUT

(V)

0.1 1 10 100 1000 10000

3.380

3.360

3.320

3.260

3.220

Output Current l

OUT

(mA)

4.8V

R1224N332G L=10µH R1224N332G (VIN=10V)

3.340

3.400

3.300

3.280

3.240

3.200

Output Voltage VOUT(V)

0.1 1 10 100 1000 10000

3.380

3.360

3.320

3.260

3.220

Output Current lOUT(mA)

VIN15V

VIN12V

VIN4.8V

3.32

3.35

3.30

Output Current lOUT(mA)

Output Voltage VOUT(V)

0.1 1 10 100 1000 10000

3.34

3.33

3.31

R1224N332G (VIN=16V) R1224N332H L=10µH

3.32

3.35

3.30

Output Current l

OUT

(mA)

Output Voltage V

OUT

(V)

0.1 1 10 100 1000 10000

3.34

3.33

3.31

3.340

3.400

3.300

3.280

3.240

3.200

Output Voltage V

OUT

(V)

0.1 1 10 100 1000 10000

3.380

3.360

3.320

3.260

3.220

Output Current l

OUT

(mA)

15V

12V

4.8V

R1224N

R1224N332L L=27µH R1224N332M L=27µH

3.340

3.400

3.300

3.280

3.240

3.200

Output Voltage V

OUT

(V)

0.1 1 10 100 1000 10000

3.380

3.360

3.320

3.260

3.220

Output Current l

OUT

(mA)

4.8V

3.340

3.400

3.300

3.280

3.240

3.200

Output Voltage V

OUT

(V)

0.1 1 10 100 1000 10000

3.380

3.360

3.320

3.260

3.220

Output Current l

OUT

(mA)

15V

12V

4.8V

R1224N332M (VIN=5V) R1224N332M (VIN=10V)

3.32

3.35

3.30

Output Voltage VOUT(V)

3.34

3.33

3.31

Output Current l

OUT(A)

012345

3.32

3.35

3.30

Output Voltage VOUT(V)

3.34

3.33

3.31

Output Current lOUT(A)

012345

R1224N332M (VIN=18V) R1224N502E L=10µH

3.32

3.35

3.30

Output Voltage V

OUT

(V)

3.34

3.33

3.31

Output Current l

OUT

(A)

01234

5.040

5.100

5.000

4.980

4.940

4.900

Output Voltage V

OUT

(V)

0.1

1 10 100 1000 10000

5.080

5.060

5.020

4.960

4.920

Output Current l

OUT

(mA)

10V

6.5V

R1224N

R1224N502F L=10µH R1224N502G L=10µH

5.040

5.100

5.000

4.980

4.940

4.900

Output Voltage V

OUT

(V)

0.1

1 10 100 1000 10000

5.080

5.060

5.020

4.960

4.920

Output Current l

OUT

(mA)

10V

6.5V

5.040

5.100

5.000

4.980

4.940

4.900

Output Voltage V

OUT

(V)

0.1

1 10 100 1000 10000

5.080

5.060

5.020

4.960

4.920

Output Current l

OUT

(mA)

15V

12V

6.5V

R1224N502G (VIN=10V) R1224N502G (VIN=16V)

5.02

5.05

5.000.1 1 10 100 1000 10000

5.04

5.03

5.01

Output Voltage VOUT(V)

Output Current lOUT(mA)

5.02

5.05

5.00

Output Current lOUT(mA)

Output Voltage VOUT(V)

0.1 1 10 100 1000 10000

5.04

5.03

5.01

R1224N502H L=10µH R1224N502L L=27µH

5.040

5.100

5.000

4.980

4.940

4.900

Output Voltage V

OUT

(V)

0.1

1 10 100 1000 10000

5.080

5.060

5.020

4.960

4.920

Output Current l

OUT

(mA)

15V

12V

6.5V

5.040

5.100

5.000

4.980

4.940

4.900

Output Voltage V

OUT

(V)

0.1

1 10 100 1000 10000

5.080

5.060

5.020

4.960

4.920

Output Current l

OUT

(mA)

10V

6.5V

R1224N

R1224N502M L=27µH

5.040

5.100

5.000

4.980

4.940

4.900

Output Voltage V

OUT

(V)

0.1 1 10 100 1000 10000

5.080

5.060

5.020

4.960

4.920

Output Current l

OUT

(mA)

15V

12V

6.5V

*Note: Typical characteristics 1) are obtained with using

the following components;

PMOS : IRF7406 (IR)

L : CDRH127-100MC (Sumida: 10µH)

SD : RB083L-20 (Rohm)

C1 : 25SC47 (Sanyo/OS-con: 47µF/25V)2

C2 : 0.1µF (Ceramic Type)

C3 : 10SA220 (Sanyo/OS-con: 220µF/10V)

R1 : 10

2) Efficiency vs. Output Current (*Note)

R1224N182F (VIN=3.3V) CDRH127-10µH R1224N182F (VIN=5.0V) CDRH127-10µH

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N182G (VIN=3.3V) CDRH127-10µH R1224N182G (VIN=5.0V) CDRH127-10µH

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

100

Efficiency η(%)

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

R1224N

R1224N182G (VIN=12V) CDRH127-10µH R1224N182H (VIN=3.3V) CDRH127-10µH

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N182H (VIN=5.0V) CDRH127-10µH R1224N182H (VIN=12V) CDRH127-10µH

Output Current lOUT(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current lOUT(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N182L (VIN=3.3V) CDRH127-27µH R1224N182L (VIN=5.0V) CDRH127-27µH

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N

R1224N182M (VIN=3.3V) CDRH127-27µH R1224N182M (VIN=5.0V) CDRH127-27µH

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N182M (VIN=12V) CDRH127-27µH R1224N332E (VIN=7.0V) CDRH127-10µH

Output Current lOUT(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current lOUT(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N332E (VIN=4.8V) CDRH127-10µH R1224N332F (VIN=7.0V) CDRH127-10µH

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N

R1224N332F (VIN=4.8V) CDRH127-10µH R1224N332G (VIN=12V) CDRH127-10µH

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N332G (VIN=4.8V) CDRH127-10µH R1224N332G (VIN=10V)

Output Current lOUT(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current lOUT(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N332G (VIN=16V) R1224N332G (VIN=15V) CDRH127-10µH

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N

R1224N332H (VIN=12V) CDRH127-10µH R1224N332H (VIN=4.8V) CDRH127-10µH

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N332H (VIN=15V) CDRH127-10µH R1224N332L (VIN=7.0V) CDRH127-27µH

Output Current lOUT(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current lOUT(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N332L (VIN=4.8V) CDRH127-27µH R1224N332M (VIN=12V) CDRH127-27µH

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N

R1224N332M (VIN=4.8V) CDRH127-27µH R1224N332M (VIN=5V)

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current l

OUT

(A)

012345

100

Efficiency η(%)

R1224N332M (VIN=10V) R1224N332M (VIN=18V)

Output Current lOUT(A)

012345

100

Efficiency η(%)

100

Efficiency η(%)

Output Current l

OUT(A)

01234

R1224N332M (VIN=15V) CDRH127-27µH R1224N502E (VIN=6.5V) CDRH127-10µH

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N

R1224N502E (VIN=10V) CDRH127-10µH R1224N502F (VIN=6.5V) CDRH127-10µH

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N502F (VIN=10V) CDRH127-10µH R1224N502G (VIN=10V)

Output Current lOUT(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current lOUT(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N502G (VIN=16V) R1224N502G (VIN=6.5V) CDRH127-10µH

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N

R1224N502G (VIN=12V) CDRH127-10µH R1224N502G (VIN=15V) CDRH127-10µH

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N502H (VIN=6.5V) CDRH127-10µH R1224N502H (VIN=12V) CDRH127-10µH

Output Current lOUT(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current lOUT(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N502H (VIN=15V) CDRH127-10µH R1224N502L (VIN=6.5V) CDRH127-27µH

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N

R1224N502L (VIN=10V) CDRH127-27µH R1224N502M (VIN=6.5V) CDRH127-27µH

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current l

OUT

(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

R1224N502M (VIN=12V) CDRH127-27µH R1224N502M (VIN=15V) CDRH127-27µH

Output Current lOUT(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

Output Current lOUT(mA)

0.1 1 10 100 1000 10000

100

Efficiency η(%)

*Note: Typical characteristics 2) are obtained with using the following components;

PMOS : IRF7406 (IR)

L : CDRH127-100MC (Sumida: 10µH) C2 : 0.1µF (Ceramic Type)

SD : RB083L-20 (Rohm) C3 : 10SA220 (Sanyo/OS-con: 220µF/10V)

C1 : 25SC47 (Sanyo/OS-con: 47µF/25V)2 R1 : 10

R1224N

3) Ripple Voltage vs. Output Current

R1224N182E L=10µH R1224N182F L=10µH

Output Current I

OUT

(mA)

Ripple Voltage Vrpp(mV)

0.1 1 10 100001000100

3.3V

Output Current I

OUT

(mA)

Ripple Voltage Vrpp(mV)

0.1 1 10 100001000100

3.3V

R1224N182G L=10µH R1224N182H L=10µH

12V

3.3V

Output Current I

OUT

(mA)

Ripple Voltage Vrpp(mV)

0.1 1 10 100001000100

12V

3.3V

Output Current I

OUT

(mA)

Ripple Voltage Vrpp(mV)

0.1 1 10 100001000100

R1224N182L L=27µH R1224N182M L=27µH

Output Current I

OUT

(mA)

Ripple Voltage Vrpp(mV)

0.1 1 10 100001000100

3.3V

12V

3.3V

Output Current I

OUT

(mA)

Ripple Voltage Vrpp(mV)

0.1 1 10 100001000100

R1224N

R1224N332E L=10µH R1224N332F L=10µH

Output Current I

OUT

(mA)

Ripple Voltage Vrpp(mV)

0.1 1 10 100001000100

4.8V

Output Current I

OUT

(mA)

Ripple Voltage Vrpp(mV)

0.1 1 10 100001000100

4.8V

R1224N332G L=10µH R1224N332H L=10µH

Output Current lOUT(mA)

Ripple Voltage Vrpp(mV)

0.1 110

100 1000 10000

VIN15V

VIN12V

VIN4.8V

Output Current lOUT(mA)

Ripple Voltage Vrpp(mV)

0.1 1 10 100 1000 10000

VIN15V

VIN12V

VIN4.8V

R1224N332L L=27µH R1224N332M L=27µH

Output Current l

OUT

(mA)

Ripple Voltage Vrpp(mV)

0.1 1 10 100 1000 10000

4.8V

Output Current l

OUT

(mA)

Ripple Voltage Vrpp(mV)

0.1 1 10 100 1000 10000

15V

12V

4.8V

R1224N

R1224N502E L=10µH R1224N502F L=10µH

Output Current l

OUT

(mA)

Ripple Voltage Vrpp(mV)

0.1 1 10 100 1000 10000

10V

6.5V

Output Current l

OUT

(mA)

Ripple Voltage Vrpp(mV)

0.1 1 10 100 1000 10000

10V

6.5V

R1224N502G L=10µH R1224N502H L=10µH

Output Current IOUT(mA)

Ripple Voltage Vrpp(mV)

0.1 1 10 100001000100

VIN15V

VIN12V

VIN6.5V

Output Current IOUT(mA)

Ripple Voltage Vrpp(mV)

0.1 1 10 100001000100

VIN15V

VIN12V

VIN6.5V

R1224N502L L=27µH R1224N502M L=27µH

Output Current I

OUT

(mA)

Ripple Voltage Vrpp(mV)

0.1 1 10 100001000100

10V

6.5V

Output Current I

OUT

(mA)

Ripple Voltage Vrpp(mV)

0.1 1 10 100001000100

15V

12V

6.5V

R1224N

4) Output Voltage vs. Input Voltage

R1224N182E L=10µH R1224N182F L=10µH

2.00

1.95

1.90

1.85

1.80

1.75

1.70

1.65

1.60

Input Voltage V

(V)

Output Voltage V

OUT

(V)

0 5 10 15 20

1mA

500mA

2.00

1.95

1.90

1.85

1.80

1.75

1.70

1.65

1.60

Input Voltage V

(V)

Output Voltage V

OUT

(V)

0 5 10 15 20

1mA

500mA

R1224N182G L=10µH R1224N182H L=10µH

2.00

1.95

1.90

1.85

1.80

1.75

1.70

1.65

1.60

Input Voltage V

(V)

Output Voltage V

OUT

(V)

0 5 10 15 20

-1mA

-500mA

2.00

1.95

1.90

1.85

1.80

1.75

1.70

1.65

1.60

Input Voltage V

(V)

Output Voltage V

OUT

(V)

0 5 10 15 20

-1mA

-500mA

R1224N182L L=27µH R1224N182M L=27µH

2.00

1.95

1.90

1.85

1.80

1.75

1.70

1.65

1.60

Input Voltage VIN(V)

Output Voltage VOUT(V)

0 5 10 15 20

1mA

500mA

2.00

1.95

1.90

1.85

1.80

1.75

1.70

1.65

1.60

Input Voltage VIN(V)

Output Voltage VOUT(V)

0 5 10 15 20

1mA

500mA

R1224N

R1224N332E L=10µH R1224N332F L=10µH

3.40

3.34

3.36

3.38

3.32

3.30

3.28

3.26

3.24

3.22

3.20

Input Voltage V

(V)

Output Voltage V

OUT

(V)

0 5 10 15 20

1mA

500mA

3.40

3.34

3.36

3.38

3.32

3.30

3.28

3.26

3.24

3.22

3.20

Input Voltage V

(V)

Output Voltage V

OUT

(V)

0 5 10 15 20

1mA

500mA

R1224N332G L=10µH R1224N332H L=10µH

3.40

3.34

3.36

3.38

3.32

3.30

3.28

3.26

3.24

3.22

3.20

Input Voltage VIN(V)

Output Voltage VOUT(V)

0 5 10 15 20

-1mA

-500mA

3.40

3.34

3.36

3.38

3.32

3.30

3.28

3.26

3.24

3.22

3.20

Input Voltage VIN(V)

Output Voltage VOUT(V)

0 5 10 15 20

-1mA

-500mA

R1224N332L L=27µH R1224N332M L=27µH

3.40

3.34

3.36

3.38

3.32

3.30

3.28

3.26

3.24

3.22

3.20

Input Voltage V

(V)

Output Voltage V

OUT

(V)

0 5 10 15 20

1mA

500mA

3.40

3.34

3.36

3.38

3.32

3.30

3.28

3.26

3.24

3.22

3.20

Input Voltage V

(V)

Output Voltage V

OUT

(V)

0 5 10 15 20

1mA

500mA

R1224N

R1224N502E L=10µH R1224N502F L=10µH

5.20

5.15

5.10

5.05

5.00

4.95

4.90

4.85

4.80

Input Voltage V

(V)

Output Voltage V

OUT

(V)

0 5 10 15 20

1mA

500mA

5.20

5.15

5.10

5.05

5.00

4.95

4.90

4.85

4.80

Input Voltage V

(V)

Output Voltage V

OUT

(V)

0 5 10 15 20

1mA

500mA

R1224N502G L=10µH R1224N502H L=10µH

5.20

5.15

5.10

5.05

5.00

4.95

4.90

4.85

4.80

Input Voltage V

IN(V)

Output Voltage VOUT(V)

0 5 10 15 20

-1mA

-500mA

5.20

5.15

5.10

5.05

5.00

4.95

4.90

4.85

4.80

Input Voltage VIN(V)

Output Voltage VOUT(V)

0 5 10 15 20

-1mA

-500mA

R1224N502L L=27µH R1224N502M L=27µH

5.20

5.15

5.10

5.05

5.00

4.95

4.90

4.85

4.80

Input Voltage V

(V)

Output Voltage V

OUT

(V)

0 5 10 15 20

1mA

500mA

5.20

5.15

5.10

5.05

5.00

4.95

4.90

4.85

4.80

Input Voltage V

(V)

Output Voltage V

OUT

(V)

0 5 10 15 20

1mA

500mA

R1224N

5) Output Voltage vs. Temperature

R1224N332E R1224N122F

3.33

3.32

3.31

3.30

3.29

3.28

3.27

Temperature Topt(˚C)

Output Voltage V

OUT

(V)

-40 10 6035-15 85

1.210

1.205

1.200

1.195

1.190

Temperature Topt(˚C)

Output Voltage V

OUT

(V)

-40 10 6035-15 85

R1224N602L R1224N102G

6.10

6.05

6.00

5.95

5.90

Temperature Topt(˚C)

Output Voltage V

OUT

(V)

-40 10 6035-15 85

1.010

1.005

1.000

0.995

0.990

Temperature Topt(˚C)

Output Voltage V

OUT

(V)

-40 10 6035-15 85

6) Oscillator Frequency vs. Temperature

R1224N102G R1224N102H

360

330

300

270

240

Temperature Topt(˚C)

Oscillator Frequency fosc(kHz)

-40 10 6035-15 85

600

550

500

450

400

Temperature Topt(˚C)

Oscillator Frequency fosc(kHz)

-40 10 35-15 60 85

R1224N

R1224N102M

216

198

180

162

144

Temperature Topt(˚C)

Oscillator Frequency fosc(kHz)

-40 10 6035-15 85

7) Supply Current vs. Temperature

R1224N332E R1224N602L

Temperature Topt(˚C)

Supply Current1 Iss1(μA)

-40 10 6035-15 85

Temperature Topt(˚C)

Supply Current1 Iss1(μA)

-40 10 6035-15 85

R1224N602F R1224N102G

Temperature Topt(˚C)

Supply Current1 Iss1(μA)

-40 10 6035-15 85

Temperature Topt(˚C)

Supply Current1 Iss1(μA)

-40 10 6035-15 85

R1224N

R1224N102H R1224N102M

Temperature Topt(˚C)

Supply Current1 Iss1(μA)

-40 10 6035-15 85

Temperature Topt(˚C)

Supply Current1 Iss1(μA)

-40 10 6035-15 85

8) Soft-start time vs. Temperature

R1224N102G

Temperature Topt(˚C)

Soft-start time Tsoft(ms)

-40 10 6035-15 85

9) Delay Time for Protection vs. Temperature

R1224N332E

Temperature Topt(˚C)

-15-40 35 856010

Delay Time for Protection Tprot(ms)

R1224N

10) EXT “H” Output Current vs. Temperature

R1224N332E

-10

-15

-20

-25

Temperature Topt(˚C)

EXT "H" Output Current I

EXTH

(mA)

-40 10 6035-15 85

11) EXT “L” Output Current vs. Temperature

R1224N332E

Temperature Topt(˚C)

EXT "L" Output Current I

EXTL

(mA)

-40 10 6035-15 85

12) Load Transient Response

R1224N332G L=10µH VIN=4.8V R1224N332G L=10µH VIN=4.8V

Time(sec)

-0 -0 0

1E-04 2E-04 3E-04 4E-04

3.40

3.30

3.20

3.10

3.00

2.90

2.80

2.70

2.60

3.50

2.50

1800

1600

1400

1200

1000

800

600

400

200

2000

Output Voltage VOUT(V)

Output Current IOUT(mA)

Time(sec)

-0.04 -0.02 0 0.02 0.04 0.06 0.08

3.45

3.40

3.35

3.30

3.25

3.20

3.15

3.10

3.05

3.50

3.00

1800

1600

1400

1200

1000

800

600

400

200

2000

Output Voltage VOUT(V)

Output Current IOUT(mA)

R1224N

R1224N332G L=10µH VIN=10V R1224N332G L=10µH VIN=10V

Time(sec)

-0.0002 -0.0001 0.0000 0.0001 0.0002 0.0003 0.0004

3.40

3.30

3.20

3.10

3.00

2.90

2.80

2.70

2.60

3.50

2.50

1800

1600

1400

1200

1000

800

600

400

200

2000

Output Voltage VOUT(V)

Output Current IOUT(mA)

Time(sec)

-0.04 -0.02 0 0.02 0.04 0.06 0.08

3.45

3.40

3.35

3.30

3.25

3.20

3.15

3.10

3.05

3.50

3.00

1800

1600

1400

1200

1000

800

600

400

200

2000

Output Voltage VOUT(V)

Output Current IOUT(mA)

R1224N332H L=10µH VIN=4.8V R1224N332H L=10µH VIN=4.8V

Time(sec)

-2E-04 -1E-04 0 1E-04 2E-04 3E-04 4E-04

3.40

3.30

3.20

3.10

3.00

2.90

2.80

2.70

2.60

3.50

2.50

1800

1600

1400

1200

1000

800

600

400

200

2000

Output Voltage V

OUT

(V)

Output Current I

OUT

(mA)

Time(sec)

-0.04 -0.02 0 0.02 0.04 0.06 0.08

3.45

3.40

3.35

3.30

3.25

3.20

3.15

3.10

3.05

3.50

3.00

1800

1600

1400

1200

1000

800

600

400

200

2000

Output Voltage V

OUT

(V)

Output Current I

OUT

(mA)

R1224N332H L=10µH VIN=10V R1224N332H L=10µH VIN=10V

Time(sec)

-2E-04 -1E-04 0 1E-04 2E-04 3E-04 4E-04

3.40

3.30

3.20

3.10

3.00

2.90

2.80

2.70

2.60

3.50

2.50

1800

1600

1400

1200

1000

800

600

400

200

2000

Output Voltage VOUT(V)

Output Current IOUT(mA)

Time(sec)

3.40

3.30

3.20

3.10

3.00

2.90

2.80

2.70

2.60

3.50

2.50

1800

1600

1400

1200

1000

800

600

400

200

2000

Output Voltage VOUT(V)

Output Current IOUT(mA)

-2E-04 -1E-04 0

0.0001 0.0002 0.0003 0.0004

R1224N

R1224N332M L=27µH VIN=4.8V R1224N332M L=27µH VIN=4.8V

Time(sec)

-2E-04 -1E-04 0

0.0001 0.0002 0.0003 0.0004

3.40

3.30

3.20

3.10

3.00

2.90

2.80

2.70

2.60

3.50

2.50

1800

1600

1400

1200

1000

800

600

400

200

2000

Output Voltage VOUT(V)

Output Current IOUT(mA)

Time(sec)

-0.04 -0.02 0 0.02 0.04 0.06 0.08

3.45

3.40

3.35

3.30

3.25

3.20

3.15

3.10

3.05

3.50

3.00

1800

1600

1400

1200

1000

800

600

400

200

2000

Output Voltage VOUT(V)

Output Current IOUT(mA)

R1224N332M L=27µH VIN=10V R1224N332M L=27µH VIN=10V

Time(sec)

-2E-04 -1E-04 0 1E-04 2E-04 3E-04 4E-04

3.40

3.30

3.20

3.10

3.00

2.90

2.80

2.70

2.60

3.50

2.50

1800

1600

1400

1200

1000

800

600

400

200

2000

Output Voltage V

OUT

(V)

Output Current I

OUT

(mA)

Time(sec)

-0.04 -0.02 0 0.02 0.04 0.06 0.08

3.45

3.40

3.35

3.30

3.25

3.20

3.15

3.10

3.05

3.50

3.00

1800

1600

1400

1200

1000

800

600

400

200

2000

Output Voltage V

OUT

(V)

Output Current I

OUT

(mA)

12) UVLO Voltage vs. Temperature

R1224N332E

2.20

2.05

2.10

2.15

2.00

1.95

1.90

Temperature Topt(˚C)

-15-40 10 35 8560

UVLO Voltage V

UVLO

(V)

http://www.e-devices.ricoh.co.jp/en/

Sales&SupportOﬃces

RICOHELECTRONICDEVICESCO.,LTD.

Higashi-ShinagawaOﬃce(InternationalSales)

3-32-3,Higashi-Shinagawa,Shinagawa-ku,Tokyo140-8655,Japan

Phone:+81-3-5479-2857Fax:+81-3-5479-0502

RICOHEUROPE(NETHERLANDS)B.V.

SemiconductorSupportCentre

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Phone:+31-20-5474-309

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Phone:+49-211-6546-0

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Phone:+82-2-2135-5700Fax:+82-2-2051-5713

RICOHELECTRONICDEVICESSHANGHAICO.,LTD.

Room403,No.2Building,No.690BiboRoad,PuDongNewDistrict,Shanghai201203,

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Phone:+86-21-5027-3200Fax:+86-21-5027-3299

RICOHELECTRONICDEVICESCO.,LTD.

Taipeioﬃce

Room109,10F-1,No.51,HengyangRd.,TaipeiCity,Taiwan(R.O.C.)

Phone:+886-2-2313-1621/1622Fax:+886-2-2313-1623

Ricoh is committed to reducing the environmental loading materials in electrical devices

with a view to contributing to the protection of human health and the environment.

Ricoh has been providing RoHS compliant products since April 1, 2006 and Halogen-free products since

April 1, 2012.

Halogen Free

 1.Theproducts andthe productspeciﬁcationsdescribedinthis documentare subjecttochangeordiscontinuation of

productionwithout noticeforreasons

suchas improvement.Therefore,before decidingto usethe products,please

refertoRicohsalesrepresentativesforthelatestinformationthereon.

 2.Thematerials inthis documentmay notbe copiedor otherwisereproduced inwhole orin partwithout priorwritten

consentofRicoh.

 3.Please be sure to take any necessary formalities under relevant laws or regulations before exporting or otherwise

takingoutofyourcountrytheproductsorthetechnicalinformationdescribedherein.

 4.Thetechnicalinformationdescribedinthisdocumentshowstypicalcharacteristicsofandexampleapplicationcircuits

fortheproducts.Thereleaseofsuchinformationisnottobeconstruedasawarrantyoforagrantoflicenseunder

Ricoh'soranythirdparty'sintellectualpropertyrightsoranyotherrights.

 5.Theproductslistedinthisdocumentareintendedanddesignedforuseasgeneralelectroniccomponentsinstandard

applications (oﬃce equipment, telecommunication equipment, measuring instruments, consumer electronic products,

amusementequipment etc.).Those customersintendingto usea productin anapplicationrequiringextremequality

andreliability,forexample,inahighlyspeciﬁcapplicationwherethefailureormisoperationoftheproductcouldresult

inhumaninjuryordeath(aircraft,spacevehicle,nuclearreactorcontrolsystem,traﬃccontrolsystem,automotiveand

transportationequipment,combustionequipment,safetydevices,lifesupportsystemetc.)shouldﬁrstcontactus.

 6.Wearemakingourcontinuouseﬀorttoimprovethequalityandreliabilityofourproducts,butsemiconductorproducts

arelikelytofailwithcertainprobability.Inordertopreventanyinjurytopersonsordamagestopropertyresultingfrom

suchfailure,customersshouldbecarefulenoughtoincorporatesafetymeasuresintheirdesign,suchasredundancy

feature,ﬁrecontainmentfeatureandfail-safefeature.Wedonotassumeanyliability

orresponsibilityforanylossor

damagearisingfrommisuseorinappropriateuseoftheproducts.

 7.Anti-radiationdesignisnotimplementedintheproductsdescribedinthisdocument.

 8.The X-ray exposure can inﬂuence functions and characteristics of the products. Conﬁrm the product functions and

characteristicsintheevaluationstage.

 9.WLCSP products should be used in light shielded environments. The light exposure can inﬂuence functions and

characteristicsoftheproductsunderoperationorstorage.

10.There can be variation in the marking when diﬀerent AOI (Automated Optical Inspection) equipment is used. In the

caseofrecognizingthemarkingcharacteristicwithAOI,pleasecontactRicohsalesorourdistributorbeforeattempting

touseAOI.

11.

PleasecontactRicohsalesrepresentativesshouldyouhaveanyquestionsorcommentsconcerningtheproductsor

thetechnicalinformation.