PWM/VFM step-down DC/DC Converter
R1224N Series
2002. Aug. 5
Rev. 1.11 - 1 -
■ 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
● Range of Input Voltage xxxxxxxxxxxxx2.3Va18.5V
● Built-in Soft-start Function and Protection Function (Reset type protection)
● Three options of Oscillator Frequency xxxxxx180kHz, 300kHz, 500kHz
● High Efficiency xxxxxxxxxxxxxxxxxxTyp. 90%
● Output Voltage xxxxxxxxxxxxx Stepwise Setting with a step of 0.1V in the range of 1.2V to 6.0V as
fixed voltage type. Reference Voltage of Adjustable Type is 1.0V
● Standby Current xxxxxxxxxxxxxxxxxTyp. 0.0µA
● High Accuracy Output Voltage xxxxxxxxxx±2.0%
● Low Temperature-Drift Coefficient of Output Voltage xxxxx Typ. ±100ppm/qC
■ 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.
Rev. 1.11 - 2 -
■ BLOCK DIAGRAM
*Fixed Output Voltage Type
OSC
V
IN
EXT
GND
VOUT
Vref
CE
Chip Enable
Soft Start
Protection
PWM/VFM
CONTROL
Vref
Amp
UVLO
*Adjustable Output Voltage Type
OSC
V
IN
EXT
GND
VFB
Vref
CE
Chip Enable
Soft Start
Protection
PWM/VFM
CONTROL
Vref
UVLO
Amp
Rev. 1.11 - 3 -
■ SELECTION GUIDE
In the R1224N Series, the output voltage, the oscillator frequency, the optional function, and the taping type
for the ICs can be selected at the user’s request.
The selection can be made with designating the part number as shown below;
R1224NXX2X-TR
nnn
abc
Code Contents
a Setting Output Voltage(VOUT):
Stepwise setting with a step of 0.1V in the range of 1.2V to 6.0V is possible.
Adjustable type; a=10 means Reference voltage=1.0V Optional Function is G/H/M.
bDesignation of Oscillator Frequency
2 : fixed
cDesignation of Optional Function
E : 300kHz, with a PWM/VFM alternative circuit
F : 500kHz, with a PWM/VFM alternative circuit
G : 300kHz, without a PWM/VFM alternative circuit
H : 500kHz, without a PWM/VFM alternative circuit
L : 180kHz, with a PWM/VFM alternative circuit
M : 180kHz, without a PWM/VFM alternative circuit
■ PIN CONFIGURATION
●SOT-23-5
13
V
OUT
CE GND (VFB)
(mark side)
54
2
VIN EXT
■PIN DESCRIPTION
㩷
Pin No.Symbol Description
1 CE Chip Enable Pin (Active with “H”)
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
Rev. 1.11 - 4 -
■ ABSOLUTE MAXIMUM RATINGS
(GND=0V)
Symbol Item Rating Unit
VIN V
IN Supply Voltage 20 V
VEXT EXT Pin Output Voltage -0.3aVIN+0.3 V
VCE CE Pin Input Voltage -0.3aVIN+0.3 V
VOUT/(VFB) VOUT/VFB Pin Input Voltage -0.3aVIN+0.3 V
IEXT EXT Pin Inductor Drive Output Current r50 mA
PD Power Dissipation 250 mW
Topt Operating Temperature Range -40a+85 qC
Tstg Storage Temperature Range -55a+125 qC
■ ELECTRICAL CHARACTERISTICS
●R1224Nxx2X (X=E/F/G/H/L/M) except R1224N102X (Topt=25qC)
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 VSETd1.5V, VIN=VCE=3.0V
VSETu
0.98
VSET VSETu
1.02
V
'VOUT/
'T
Step-down Output Voltage
Temperature Coefficient
-40qCd Topt d 85qCr100 ppm
/qC
fosc Oscillator Frequency VIN=VCE=VSET+1.5V, IOUT=-100mA
When VSETd1.5, VIN=VCE=3.0V
L/M version
E/G version
F/H version
144
240
400
180
300
500
216
360
600
kHz
'fOSC/
'T
Oscillator Frequency
Temperature Coefficient
-40qCd Topt d 85qCr0.2 %
/qC
IDD1 Supply Current1 VIN=VCE=VOUT=18.5V
E/F/L/M version
G version
H version
20
30
40
50
60
80
PA
Istb Standby Current VIN=18.5V, VCE=0V, VOUT=0V 0.0 0.5
PA
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 0.5
PA
ICEL CE "L" Input Current VIN= VOUT=18.5V, VCE=0V -0.5 0.0
PA
VCEH CE "H" Input Voltage VIN=8V,VOUT=0V 1.5 V
VCEL CE "L" Input Voltage VIN=8V,VOUT=0V 0.3 V
Maxdty 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
Rev. 1.11 - 5 -
●R1224N102X (X=G/H/M) (Topt=25qC)
Symbol Item Conditions Min. Typ. Max. Unit
VIN Operating Input Voltage 2.3 18.5 V
VFB Feedback Voltage VIN=VCE=3.5V, IFB=-100mA 0.98 1.00 1.02 V
'VFB/
'T
Feedback Voltage
Temperature Coefficient
-40qCd Topt d 85qCr100 ppm
/qC
fosc Oscillator Frequency VIN=VCE=3.5V, IFB=-100mA
M version
G version
H version
144
240
400
180
300
500
216
360
600
kHz
'fOSC/
'T
Oscillator Frequency
Temperature Coefficient
-40qCd Topt d 85qCr0.2 %
/qC
IDD1 Supply Current1 VIN=VCE=VFB=18.5V
M version
G version
H version
20
30
40
50
60
80
PA
Istb Standby Current VIN=18.5V, VCE=0V, VFB=0V 0.0 0.5
PA
IEXTH EXT "H" Output Current VIN=8V,VEXT=7.9V,VFB=8V,VCE=8V -17 mA
IEXTL EXT "L" Output Current VIN=8V,VEXT=0.1V,VFB=0V,VCE=8V 30 mA
ICEH CE "H" Input Current VIN=VCE=VFB=18.5V 0.0 0.5
PA
ICEL CE "L" Input Current VIN= VFB=18.5V, VCE=0V -0.5 0.0
PA
VCEH CE "H" Input Voltage VIN=8V,VFB=0V 1.5 V
VCEL CE "L" Input Voltage VIN=8V,VFB=0V 0.3 V
Maxdty 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, IFB=-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
■ TYPICAL APPLICATION AND APPLICATION HINTS
(1) Fixed Output Voltage Type (R1224Nxx2E/F/G/H/L/M except xx=10)
C3
C2
L
C1
R1
SD
VOUT
VIN
CE
CE CONTROL
LOAD
EXT
GND
PMOS
PMOS: HAT1044M (Hitachi) L: CR105-270MC (Sumida, 27PH)
SD1: RB063L-30 (Rohm) C3: 47PF (Tantalum Type)
C1: 10PF (Ceramic Type) C2: 0.1PF (Ceramic Type)
R1: 10:
Rev. 1.11 - 6 -
(2) Adjustable Output Type (R1224N102G/H/M) Example: Output Voltage=3.2V
C3
C2
L
C1
R1
SD
VFB
VIN
CE
CE CONTROL
LOAD
EXT
GND
C4
R2
R4
R3
PMOS
PMOS: HAT1044M (Hitachi) L: CR105-270MC (Sumida, 27PH)
SD1: RB063L-30 (Rohm) C3: 47PF (Tantalum Type)
C1: 10PF (Ceramic Type) C2: 0.1PF (Ceramic Type) C4: 1000pF(Ceramic Type)
R1: 10:, R2=22k:, R3=2.7k:, R4=33k:
When you use these ICs, consider the following issues;㩷
㩷
● 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 VOUT 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 VOUT. 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 22PF 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 R1225N 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
Rev. 1.11 - 7 -
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.
✰ 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.
■ 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:
V
OUT: R2+R4=VFB: R2
V
OUT=VFBu(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.
Fpole a1/2SLuC3
A zero (signal back to zero) is formed with R4 and C4.
#Fzeroa1/(2SuR4uC4)
For example, if L=27PH, C3=47PF, 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.
C3
C2
L
C1
R1
SD
VFB
VIN
CE
CE CONTROL
LOAD
EXT
GND
C4
R2
R4
R3
PMOS
Rev. 1.11 - 8 -
■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:
<Basic Circuits> <Current through L>
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 u topen / L = (VIN-VOUT)uton/LEquation 1
wherein, T=1/fosc=ton+toff
duty (%)=ton/Tu100=tonu fosc u 100
topen d toff
In Equation 1, VOUTutopen/L and (VIN-VOUT)uton/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.
In the continuous mode, when Equation 1 is solved for ton and assumed that the solution is tonc,
tonc=TuVOUT/VIN Equation 2
When ton<tonc, the mode is the discontinuous mode, and when ton=tonc, the mode is the continuous mode.
SD
L
CL
VOUT
IOUT
VIN Lx Tr
i1
i2
T=1/fosc
toff ton
ILmax
ILmin topen
Rev. 1.11 - 9 -
■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.)
V
IN=VOUT+(Rp+RL)uIOUT+LuIRP/ton Equation 3
When Lx Tr. is OFF:
LuIRP/toff = VF+VOUT+RLuIOUT Equation 4
Put Equation 4 to Equation 3 and solve for ON duty, ton/(toff+ton)=DON,
D
ON=(VOUT+VF+RLuIOUT)/(VIN+VF-RpuIOUT)Equation 5
Ripple Current is as follows;
I
RP=(VIN-VOUT-RpuIOUT-RLuIOUT)uDON/f/L }Equation 6
Wherein, peak current that flows through L, Lx Tr., and SD is as follows;
ILmax=I
OUT+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.
■ 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 10PF for stable
operation.
COUT can reduce ripple of Output Voltage, therefore 47PF 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.
Rev. 1.11 - 10 -
■TEST CIRCUITS
A) Output Voltage, Oscillator Frequency, CE”H” Input Voltage, CE”L” Input Voltage, Soft-start time
EXT
GND
VOUT
(VFB)
VIN
CE
PMOS
L1
+
-
C1 +
-
C2
D1
Oscilloscope
V
B) Supply Current1 C) Standby Current
EXT
GND
VOUT
(VFB)
VIN
CE
A
EXT
GND
VOUT
(VFB)
VIN
CE
A
D) EXT “H” Output Current E) EXT “L” Output Current
EXT
GND
VOUT
(VFB)
VIN
CE
A
EXT
GND
VOUT
(VFB)
VIN
CE
A
F) CE “H” Input Current, CE “L” Input Current G) Output Delay Time for Protection Circuit
EXT
GND
VOUT
(VFB)
VIN
CE A
Oscilloscope
EXT
GND
VOUT
(VFB)
VIN
CE
+
-
C2
PMOS: HAT1044M (Hitachi) L: CD104-270MC (Sumida, 27PH)
SD1: RB491D (Rohm)
C1: 47PF (Tantalum Type) C2: 47PF (Tantalum Type)
Rev. 1.11 - 11 -
■TYPICAL CHARACTERISTICS
1) Output Voltage vs. Output Current (*Note)
R1224N182E L=10uH
1.750
1.770
1.790
1.810
1.830
1.850
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Output Voltage Vout(V)
Vin3.3V
Vin5V
R1224N182F L=10uH
1.750
1.770
1.790
1.810
1.830
1.850
0.1 1 10 100 1000 10000
Output Current Iout (mA)
Output Voltage Vout(V)
Vin3.3V
Vin5V
R1224N182G L=10uH
1.750
1.770
1.790
1.810
1.830
1.850
0.1 1 10 100 1000 10000
Output Current Iout (mA)
Output Voltage Vout(V)
Vin3.3V
Vin5V
Vin12V
R1224N182H L=10uH
1.750
1.770
1.790
1.810
1.830
1.850
0.1 1 10 100 1000 10000
Output Current Iout (mA)
Output Voltage Vout(V)
Vin3.3V
Vin5V
Vin12V
R1224N182L L=27uH
1.750
1.770
1.790
1.810
1.830
1.850
0.1 1 10 100 1000 10000
Output Current Iout (mA)
Output Voltage Vout (V)
Vin3.3V
Vin5V
R1224N182M L=27uH
1.750
1.770
1.790
1.810
1.830
1.850
0.1 1 10 100 1000 10000
Output Current Iout (mA)
Output Voltage Vout (V)
Vin3.3V
Vin5V
Vin12V
Rev. 1.11 - 12 -
R1224N332E L=10uH
3.20
3.22
3.24
3.26
3.28
3.30
3.32
3.34
3.36
3.38
3.40
0.1 1 10 100 1000 10000
Output Current Iout (mA)
Output Voltage Vout (V)
Vin4.8V
Vin7V
R1224N332F L=10uH
3.200
3.220
3.240
3.260
3.280
3.300
3.320
3.340
3.360
3.380
3.400
0.1 1 10 100 1000 10000
Output Current Iout (mA)
Output Voltage Vout (V)
Vin4.8V
Vin7V
R1224N332G L=10uH
3.200
3.220
3.240
3.260
3.280
3.300
3.320
3.340
3.360
3.380
3.400
0.1 1 10 100 1000 10000
Output Current Iout (mA)
Output Voltage Vout (V)
Vin4.8V
Vin12V
Vin15V
R1224N332G(V IN=10V)
3.30
3.31
3.32
3.33
3.34
3.35
0.1 1 10 100 1000 10000
Output Current I OUT
(mA)
Output Voltage V OUT
(V)
R1224N332G(V IN=16V)
3.30
3.31
3.32
3.33
3.34
3.35
0.1 1 10 100 1000 10000
Output Current I OUT
(mA)
Output Voltage V OUT
(V)
R1224N332H L=10uH
3.200
3.220
3.240
3.260
3.280
3.300
3.320
3.340
3.360
3.380
3.400
0.1 1 10 100 1000 10000
Output Current Iout (mA)
Output Voltage Vout (V)
Vin4.8V
Vin12V
Vin15V
Rev. 1.11 - 13 -
R1224N332L L=27uH
3.200
3.220
3.240
3.260
3.280
3.300
3.320
3.340
3.360
3.380
3.400
0.1 1 10 100 1000 10000
Output Current Iout (mA)
Output Voltage Vout (V)
Vin4.8V
Vin7V
R1224N332M L=27uH
3.200
3.220
3.240
3.260
3.280
3.300
3.320
3.340
3.360
3.380
3.400
0.1 1 10 100 1000 10000
Output Current Iout (mA)
Output Voltage Vout (V)
Vin4.8V
Vin12V
Vin15V
R1224N332M(VIN=5V)
3.30
3.31
3.32
3.33
3.34
3.35
012345
Output Current IOUT(A)
Output Voltage VOUT(V)
R1224N332M(VIN=10V)
3.30
3.31
3.32
3.33
3.34
3.35
012345
Output Current IOUT(A)
Output Voltage VOUT(V)
R1224N332M(VIN=18V)
3.30
3.31
3.32
3.33
3.34
3.35
01234
Output Current IOUT(A)
Output Voltage VOUT(V)
R1224N502E L=10uH
4.900
4.920
4.940
4.960
4.980
5.000
5.020
5.040
5.060
5.080
5.100
0.1 1 10 100 1000 10000
Output Current Iout (mA)
Output Voltage Vout (V)
Vin6.5V
Vin10V
Rev. 1.11 - 14 -
R1224N502F L=10uH
4.900
4.920
4.940
4.960
4.980
5.000
5.020
5.040
5.060
5.080
5.100
0.1 1 10 100 1000 10000
Output Current Iout (mA)
Output Voltage Vout (V)
Vin6.5V
Vin10V
R1224N502G L=10uH
4.900
4.920
4.940
4.960
4.980
5.000
5.020
5.040
5.060
5.080
5.100
0.1 1 10 100 1000 10000
Output Current Iout (mA)
Output Voltage Vout (V)
Vin6.5V
Vin12V
Vin15V
R1224N502G(VIN=10V)
5.00
5.01
5.02
5.03
5.04
5.05
0.1 1 10 100 1000 10000
Output Current IOUT(mA)
Output Voltage VOUT(V)
R1224N502G(VIN=16V)
5.00
5.01
5.02
5.03
5.04
5.05
0.1 1 10 100 1000 10000
Output Current IOUT(mA)
Output Voltage VOUT(V)
R1224N502H L=10uH
4.900
4.920
4.940
4.960
4.980
5.000
5.020
5.040
5.060
5.080
5.100
0.1 1 10 100 1000 10000
Output Current Iout (mA)
Output Voltage Vout (V)
Vin6.5V
Vin12V
Vin15V
R1224N502L L=27uH
4.900
4.920
4.940
4.960
4.980
5.000
5.020
5.040
5.060
5.080
5.100
0.1 1 10 100 1000 10000
Output Current Iout (mA)
Output Voltage Vout (V)
Vin6.5V
Vin10V
Rev. 1.11 - 15 -
R1224N502M L=27uH
4.900
4.920
4.940
4.960
4.980
5.000
5.020
5.040
5.060
5.080
5.100
0.1 1 10 100 1000 10000
Output Current Iout (mA)
Output Voltage Vout (V)
Vin6.5V
Vin12V
Vin15V
2) Efficiency vs. Output Current (*Note)
R1224N182F(Vin=3.3V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N182F(Vin=5.0V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N182G(Vin=3.3V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N182G(Vin=5.0V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
Rev. 1.11 - 16 -
R1224N182G(Vin=12V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N182H(Vin=3.3V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N182H(Vin=5.0V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N182H(Vin=12V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N182L(Vin=3.3V) CDRH127-27uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N182L(Vin=5.0V) CDRH127-27uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
Rev. 1.11 - 17 -
R1224N182M(Vin=3.3V) CDRH127-27uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N182M(Vin=5.0V) CDRH127-27uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N182M(Vin=12V) CDRH127-27uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N332E(Vin=7.0V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N332E(Vin=4.8V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N332F(Vin=7.0V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
Rev. 1.11 - 18 -
R1224N332F(Vin=4.8V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N332G(Vin=12V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N332G(Vin=4.8V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N332G(VIN=10V)
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100 1000 10000
Output Current IOUT(mA)
Efficiency (%)
R1224N332G(VIN=16V)
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100 1000 10000
Output Current IOUT(mA)
Efficiency (%)
R1224N332G(Vin=15V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
Rev. 1.11 - 19 -
R1224N332H(Vin=12V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N332H(Vin=4.8V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N332H(Vin=15V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N332L(Vin=7.0V) CDRH127-27uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N332L(Vin=4.8V) CDRH127-27uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N332M(Vin=12V) CDRH127-27uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
Rev. 1.11 - 20 -
R1224N332M(Vin=4.8V) CDRH127-27uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N332M(VIN=5V)
80
82
84
86
88
90
92
94
96
98
100
012345
Output Current IOUT(A)
Efficiency (%)
R1224N332M(VIN=10V)
80
82
84
86
88
90
92
94
96
98
100
012345
Output Current IOUT(A)
Efficiency (%)
R1224N332M(VIN =18V)
80
82
84
86
88
90
92
94
96
98
100
01234
Output Current IOUT
(A)
Efficiency (%)
R1224N332M(Vin=15V) CDRH127-27uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N502E(Vin=6.5V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
Rev. 1.11 - 21 -
R1224N502E(Vin=10V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N502F(Vin=6.5V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N502F(Vin=10V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N502G(VIN=10V)
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100 1000 10000
Output Current IOUT(mA)
Efficiency (%)
R1224N502G(VIN=16V)
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100 1000 10000
Output Current IOUT(mA)
Efficiency (%)
R1224N502G(Vin=6.5V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
Rev. 1.11 - 22 -
R1224N502G(Vin=12V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N502G(Vin=15V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N502H(Vin=6.5V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N502H(Vin=12V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N502H(Vin=15V) CDRH127-10uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N502L(Vin=6.5V) CDRH127-27uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
Rev. 1.11 - 23 -
R1224N502L(Vin=10V) CDRH127-27uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N502M(Vin=6.5V) CDRH127-27uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N502M(Vin=12V) CDRH127-27uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
R1224N502M(Vin=15V) CDRH127-27uH
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Efficiency
*Note: Typical characteristics 9), 10) are obtained with using the following components;
PMOS: IRF7406 (IR)
L: CDRH127-100MC (Sumida: 10PH) C2: 0.1PF (Ceramic Type)
SD: RB083L-20 (Rohm) C3: 10SA220(Sanyo/OS-con: 220PF/10V)
C1: 25SC47(Sanyo/OS-con: 47PF/25V)u2 R1: 10:
3) Ripple Voltage vs. Output Current
R1224N182E L=10uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin3.3V
Vin5V
R1224N182F L=10uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin3.3V
Vin5V
Rev. 1.11 - 24 -
R1224N182G L=10uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin3.3V
Vin5V
Vin12V
R1224N182H L=10uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin3.3V
Vin5V
Vin12V
R1224N182L L=27uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin3.3V
Vin5V
R1224N182M L=27uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin3.3V
Vin5V
Vin12V
R1224N332E L=10uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin4.8V
Vin7V
R1224N332F L=10uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin4.8V
Vin7V
Rev. 1.11 - 25 -
R1224N332G L=10uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin4.8V
Vin12V
Vin15V
R1224N332H L=10uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin4.8V
Vin12V
Vin15V
R1224N332L L=27uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin4.8V
Vin7V
R1224N332M L=27uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin4.8V
Vin12V
Vin15V
R1224N502E L=10uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin6.5V
Vin10V
R1224N502F L=10uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin6.5V
Vin10V
Rev. 1.11 - 26 -
R1224N502G L=10uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin6.5V
Vin12V
Vin15V
R1224N502H L=10uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin6.5V
Vin12V
Vin15V
R1224N502L L=27uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin6.5V
Vin10V
R1224N502M L=27uH
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
Output Current Iout(mA)
Ripple Voltage Vrpp(mV)
Vin6.5V
Vin12V
Vin15V
4) Output Voltage vs. Input Voltage
R1224N182E L=10uH
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
1mA
500mA
R1224N182F L=10uH
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
1mA
500mA
Rev. 1.11 - 27 -
R1224N182G L=10uH
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
-1mA
-500mA
R1224N182H L=10uH
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
-1mA
-500mA
R1224N182L L=27uH
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
1mA
500mA
R1224N182M L=27uH
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
1mA
500mA
R1224N332E L=10uH
3.20
3.22
3.24
3.26
3.28
3.30
3.32
3.34
3.36
3.38
3.40
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
1mA
500mA
R1224N332F L=10uH
3.20
3.22
3.24
3.26
3.28
3.30
3.32
3.34
3.36
3.38
3.40
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
1mA
500mA
Rev. 1.11 - 28 -
R1224N332G L=10uH
3.20
3.22
3.24
3.26
3.28
3.30
3.32
3.34
3.36
3.38
3.40
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
-1mA
-500mA
R1224N332H L=10uH
3.20
3.22
3.24
3.26
3.28
3.30
3.32
3.34
3.36
3.38
3.40
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
-1mA
-500mA
R1224N332L L=27uH
3.20
3.22
3.24
3.26
3.28
3.30
3.32
3.34
3.36
3.38
3.40
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
1mA
500mA
R1224N332M L=27uH
3.20
3.22
3.24
3.26
3.28
3.30
3.32
3.34
3.36
3.38
3.40
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
1mA
500mA
R1224N502E L=10uH
4.80
4.85
4.90
4.95
5.00
5.05
5.10
5.15
5.20
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
1mA
500mA
R1224N502F L=10uH
4.80
4.85
4.90
4.95
5.00
5.05
5.10
5.15
5.20
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
1mA
500mA
Rev. 1.11 - 29 -
R1224N502G L=10uH
4.80
4.85
4.90
4.95
5.00
5.05
5.10
5.15
5.20
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
-1mA
-500mA
R1224N502H L=10uH
4.80
4.85
4.90
4.95
5.00
5.05
5.10
5.15
5.20
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
-1mA
-500mA
R1224N502L L=27uH
4.80
4.85
4.90
4.95
5.00
5.05
5.10
5.15
5.20
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
1mA
500mA
R1224N502M L=27uH
4.80
4.85
4.90
4.95
5.00
5.05
5.10
5.15
5.20
051015 20
Input Voltage Vin(V)
Output Voltage Vout(V)
1mA
500mA
5) Output Voltage vs. Temperature
R1224N332E
3.27
3.28
3.29
3.30
3.31
3.32
3.33
-40 10 60
Temperature Topt
Output Voltage VOUT(V)
R1224N122F
1.190
1.195
1.200
1.205
1.210
-40 10 60
Temperature Topt
Output Voltage VOUT(V)
(qC)
(qC)
Rev. 1.11 - 30 -
R1224N602L
5.90
5.95
6.00
6.05
6.10
-40 10 60
Temperature Topt
Output Voltage VOUT(V)
R1224N102G
0.990
0.995
1.000
1.005
1.010
-40 10 60
Temperature Topt
Output Voltage VOUT(V)
6) Oscillator Frequency vs. Temperature
R1224N102G
240
270
300
330
360
-40 10 60
Temperature Topt
Oscillator Frequency fosc (kHz)
R1224N102H
400
450
500
550
600
-40 10 60
Temperature Topt
Oscillator Frequency fosc(kHz)
R1224N102M
144
162
180
198
216
-40 -20 0 20406080
Temperature Topt
Oscillator Frequency fosc(kHz)
(qC)
(qC)
(qC) (qC)
(qC)
Rev. 1.11 - 31 -
7) Supply Current vs. Temperature
R1224N332E
0
5
10
15
20
25
-40 10 60
Temperature Topt
Supply Current1 Iss1(uA)
R1224N602L
0
5
10
15
20
25
-40 10 60
Temperature Topt
Supply Current1 Iss1(uA)
R1224N602F
0
5
10
15
20
25
-40 10 60
Temperature Topt
Supply Current1 Iss1(uA)
R1224N102G
0
10
20
30
40
-40 10 60
Temperature Topt
Supply Current1 Iss1(uA)
R1224N102H
0
10
20
30
40
50
60
-40 10 60
Temperature Topt
Supply Current1 Iss1(uA)
R1224N102M
0
10
20
30
40
-40 10 60
Temperature Topt
Supply Current1 Iss1(uA)
(qC) (qC)
(qC) (qC)
(qC) (qC)
Rev. 1.11 - 32 -
8) Soft-start time vs. Temperature
R1224N102G
5
10
15
-40 -20 0 20406080
Temperature Topt
Soft-start time Tsoft(ms)
9) Delay Time for Protection vs. Temperature
R1224N332E
10
15
20
25
30
-40 -20 0 20406080
Temperature Topt
Delay Time for Protection Tprot(ms)
10) EXT "H" Output Current vs. Temperature
R1224N332E
-25
-20
-15
-10
-40 -20 0 20406080
Temperatur e Topt
EXT "H" Output Current
IEXTH (mA)
(qC)
(qC)
(qC)
Rev. 1.11 - 33 -
11) EXT"L" Output Current vs. Temperature
R1224N332E
20
30
40
50
-40 -20 0 20406080
Temperature Topt
EXT ”L” Output Current IEXTL(mA)
12) Load Transient Response
R1224N332G L=10uH Vin=4.8V
2.50
2.60
2.70
2.80
2.90
3.00
3.10
3.20
3.30
3.40
3.50
-0 -0 0 1E-
04
2E-
04
3E-
04
4E-
04
Time(sec)
Output Voltage Vout(V)
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Output Current Iout(mA)
R1224N332G L=10uH Vin=4.8V
3.00
3.05
3.10
3.15
3.20
3.25
3.30
3.35
3.40
3.45
3.50
-0.04 -0.02 0 0.02 0.04 0.06 0.08
Time(sec)
Output Voltage Vout(V)
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Output Current Iout(mA)
R1224N332G L=10uH Vin=10V
2.50
2.60
2.70
2.80
2.90
3.00
3.10
3.20
3.30
3.40
3.50
-0.00
02
-0.00
01
0.000
0
0.000
1
0.000
2
0.000
3
0.000
4
Time(sec)
Output Voltage Vout(V)
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Output Current Iout(mA)
R1224N332G L=10uH Vin=10V
3.00
3.05
3.10
3.15
3.20
3.25
3.30
3.35
3.40
3.45
3.50
-0.04 -0.02 0 0.02 0.04 0.06 0.08
Time(sec)
Output Voltage Vout(V)
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Output Current Iout(mA)
(qC)
Rev. 1.11 - 34 -
R1224N332H L=10uH Vin=4.8V
2.50
2.60
2.70
2.80
2.90
3.00
3.10
3.20
3.30
3.40
3.50
-2E-04 -1E-04 01E-042E-04 3E-04 4E-04
Time(sec)
Output Voltage Vout(V)
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Output Current Iout (mA)
R1224N332H L=10uH Vin=4.8V
3.00
3.05
3.10
3.15
3.20
3.25
3.30
3.35
3.40
3.45
3.50
-0.04 -0.02 0 0.02 0.04 0.06 0.08
Time(sec)
Output Voltage Vout(V)
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Output Current Iout(mA)
R1224N332H L=10uH Vin=10V
2.50
2.60
2.70
2.80
2.90
3.00
3.10
3.20
3.30
3.40
3.50
-2E-
04
-1E-
04
01E-042E-04 3E-04 4E-04
Time(sec)
Output Voltage Vout(V)
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Output Current Iout(mA)
R1224N332H L=10uH Vin=10V
2.50
2.60
2.70
2.80
2.90
3.00
3.10
3.20
3.30
3.40
3.50
-2E-04 -1E-04 0 0.000
1
0.000
2
0.000
3
0.000
4
Time(sec)
Output Voltage Vout(V)
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Output Current Iout(mA)
R1224N332M L=27uH Vin=4.8V
2.50
2.60
2.70
2.80
2.90
3.00
3.10
3.20
3.30
3.40
3.50
-2E-04 -1E-04 0 0.000
1
0.000
2
0.000
3
0.000
4
Time(sec)
Output Voltage Vout(V)
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Output Current Iout(mA)
R1224N332M L=27uH Vin=4.8V
3.00
3.05
3.10
3.15
3.20
3.25
3.30
3.35
3.40
3.45
3.50
-0.04 -0.02 0 0.02 0.04 0.06 0.08
Time(sec)
Output Voltage Vout(V)
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Output Current Iout(mA)
Rev. 1.11 - 35 -
R1224N332M L=27uH Vin=10V
2.50
2.60
2.70
2.80
2.90
3.00
3.10
3.20
3.30
3.40
3.50
-2E-
04
-1E-
04
01E-04 2E-04 3E-04 4E-04
Time(sec)
Output Voltage Vout(V)
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Output Current Iout(mA)
R1224N332M L=27uH Vin=10V
3.00
3.05
3.10
3.15
3.20
3.25
3.30
3.35
3.40
3.45
3.50
-0.04 -0.02 0 0.02 0.04 0.06 0.08
Time(sec)
Output Voltage Vout(V)
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Output Current Iout(mA)
13) UVLO Voltage vs. Temperature
R1224N332E
1.90
1.95
2.00
2.05
2.10
2.15
2.20
-40 -20 0 20406080
Temperature Topt
UVLO Voltage VUVLO(V)
(qC)
