Micrel, Inc. MIC2544/2548
April 2010 4 M9999-043010
Absolute Maximum Ratings(1)
Supply Voltage (VIN)....................................................+7.0V
Output Voltage (VOUT) .................................................+7.0V
Output Current (IOUT) .................................Internally Limited
Enable Input (VEN) .................................. –0.3V to VIN+0.3V
Fault Flag Voltage (VFLG).............................................+7.0V
Fault Flag Current (IFLG) ..............................................50mA
Storage Temperature (Ts) .........................–65°C to +150°C
Junction Temperature (TJ) ........................Internally Limited
Lead Temperature (soldering, 5 sec.)........................ 260°C
ESD Rating(3).................................................................. 2kV
Operating Ratings(2)
Supply Voltage (VIN)..................................... +2.7V to +5.5V
Current Limit Set Range................................... 0.1A to 1.5A
Ambient Temperature (TA) .......................... –40°C to +85°C
Package Thermal Resistance
SOIC (θJA)........................................................160°C/W
MSOP (θJA) ......................................................206°C/W
Electrical Characteristics
VIN = +5V; TA = 25°C, bold values indicate –40°C to +85°C, unless noted.
Symbol Parameter Condition Min Typ Max Units
Switch off, OUT = open(4) # 0.75 5
μA
Supply Current Switch on, OUT = open(4) 75 160
μA
Enable high(4) 2.4 1.7 V
VEN Enable Input Voltage Enable low(1) 1.5 0.8 V
Enable Input Capacitance Note 5 1 pF
RDS(on) Switch Resistance IOUT = 500mA 80 120 mΩ
IOUT = 100mA to 1A, VOUT=1V to 4V(6) 184 230 276 V
Current Limit Factor IOUT = 500mA to 1.5A, VOUT=1V to 4V(6) 161 230 299 V
Output Leakage Current Switch off 1 10 μA
tON Output Turn-On Delay RL = 10Ω, CL = 1μF, Figures 1a, 1b 1 2 5 ms
TR Output Turn-On Rise Time RL = 10Ω, CL = 1μF, Figures 1a, 1b 1 2 5 ms
TOFF Output Turn-Off Delay RL = 10Ω, CL = 1μF, Figures 1a, 1b 22 μs
TF Output Turn-Off Fall Time RL = 10Ω, CL = 1μF, Figures 1a, 1b 21 μs
TJ increasing 140 °C
Overtemperature Threshold Shutdown TJ decreasing 130 °C
VIN = 5V, IL = 10μA 4 15
Ω
Error Flag Output Resistance VIN = 3.3V, IL = 10μA 5 20
Ω
Error Flag Off Current VFLG = 5V 0.01 1 μA
EN Pulse Reset Width MIC2548 thermal shutdown latch 5 μs
V
IN to EN Set-Up MIC2548(6) 0
μs
Current-Limit Response Time VOUT = 0V(6) 25
μs
Overcurrent Flag Response Time VOUT = VIN/2 to FLG low 5 μs
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
4. Off is ≤0.8V and on is ≥2.4V for the MIC2544-1 and MIC2548-1. Off is ≥2.4V and on is ≤0.8V for the MIC2544-2 and MIC2548-2. The enable input
has about 200mV of hysteresis.
5. Guaranteed by design but not production tested.
6. Current limit threshold is determined by ILIMIT = , where RSET is in ohms.
230V
RSET