LM3544

www.ti.com

SNVS062C – AUGUST 2000 – REVISED MAY 2013

AC ELECTRICAL CHARACTERISTICS

Limits are for TJ = 25°C and VIN = 5.0V.

SYMBOL

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

tr

OUTX Rise Time

(1)

CL = 33 μF, ILOAD = 500 mA

1.5

ms

tf

OUTX Fall Time

(2)

CL = 33 μF, ILOAD = 500 mA

0.9

ms

tON

Turn-on Delay(3)

CL = 33 μF, ILOAD = 500 mA

2.9

ms

tOFF

Turn-off Delay(4)

CL = 33 μF, ILOAD = 500 mA

0.7

ms

tF

Flag Delay(5)

IFLAG = 10 mA

7

ms

(1)

Time for OUTX to rise from 10% to 90% of its enabled steady-state value after ENX (ENX) is asserted.

(2)

Time for OUTX to fall from 10% to 90% of its enabled steady-state value after ENX (ENX) is deasserted.

(3)

Time between ENX rising through VIH (ENX falling through VIL) and OUTX rising through 90% of its enabled steady-state voltage.

(4)

Time between ENX falling through VIL (ENX rising through VIH) and OUTX falling through 10% of its enabled steady-state voltage.

(5)

Time between ENX rising through VIN (ENX falling through VIN) and FLAGX falling through 0.3V when OUTX is connected to GND.

PIN DESCRIPTIONS

Pin Number

Pin Name

Pin Function

2, 6

IN 1, 2

Supply Inputs: These pins are the inputs to the power switches and the supply input for

the IC. In most applications they are connected together externally and to a single input

voltage supply.

1, 5

GND 1, 2

Grounds: Must be connected together and to a common ground.

15, 14, 11, 10

OUT 1, 2, 3, 4

Switch Outputs: These pins are the outputs of the high side switches.

3, 4, 7, 8

LM3544-H: EN 1, 2, 3, 4

Enable (Inputs): Active-high (or active-low) logic enable inputs.

(LM3544-L: EN 1, 2, 3, 4)

16, 13, 12, 9

FLAG 1, 2, 3,4

Fault Flag (Outputs): Active-low open drain outputs. Indicates over-current, UVLO or

thermal shutdown. See APPLICATION INFORMATION for more details.

Copyright © 2000–2013, Texas Instruments Incorporated

Submit Documentation Feedback

5

Product Folder Links: LM3544