MIC2544 datasheet(4/14 Pages) MICREL

4 / 14 page

Micrel, Inc.

MIC2544/2548

April 2010

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

μA

Supply Current

Switch on, OUT = open

(4)

160

μA

Enable high

(4)

2.4

1.7

VEN

Enable Input Voltage

Enable low

(1)

1.5

0.8

Enable Input Capacitance

Note 5

RDS(on)

Switch Resistance

IOUT = 500mA

120

IOUT = 100mA to 1A, VOUT=1V to 4V

(6)

184

230

276

Current Limit Factor

IOUT = 500mA to 1.5A, VOUT=1V to 4V

(6)

161

230

299

Output Leakage Current

Switch off

μA

tON

Output Turn-On Delay

RL = 10Ω, CL = 1μF, Figures 1a, 1b

Output Turn-On Rise Time

RL = 10Ω, CL = 1μF, Figures 1a, 1b

TOFF

Output Turn-Off Delay

RL = 10Ω, CL = 1μF, Figures 1a, 1b

μs

Output Turn-Off Fall Time

RL = 10Ω, CL = 1μF, Figures 1a, 1b

μs

TJ increasing

140

°C

Overtemperature Threshold Shutdown

TJ decreasing

130

°C

VIN = 5V, IL = 10μA

Error Flag Output Resistance

VIN = 3.3V, IL = 10μA

Error Flag Off Current

VFLG = 5V

0.01

μA

EN Pulse Reset Width

MIC2548 thermal shutdown latch

μs

VIN to EN Set-Up

MIC2548

(6)

μs

Current-Limit Response Time

VOUT = 0V

(6)

μs

Overcurrent Flag Response Time

VOUT = VIN/2 to FLG low

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

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