LM3544 datasheet(4/13 Pages) NSC

4 / 13 page

AC Electrical Characteristics

Limits are for T

J = 25˚C and VIN = 5.0V.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

OUT

x Rise Time (Note 5)

L = 33 µF, ILOAD = 500 mA

1.5

OUT

x Fall Time (Note 6)

L = 33 µF, ILOAD = 500 mA

0.9

Turn-on Delay (Note 7)

L = 33 µF, ILOAD = 500 mA

2.9

OFF

Turn-off Delay (Note 8)

L = 33 µF, ILOAD = 500 mA

0.7

Flag Delay (Note 9)

FLAG =10mA

Note 5: Time for OUTx to rise from 10% to 90% of its enabled steady-state value after ENx (ENx) is asserted.

Note 6: Time for OUTx to fall from 10% to 90% of its enabled steady-state value after ENx (ENx) is deasserted.

Note 7: Time between ENx rising through VIH (ENx falling through VIL) and OUTx rising through 90% of its enabled steady-state voltage.

Note 8: Time between ENx falling through VIL (ENx rising through VIH) and OUTx falling through 10% of its enabled steady-state voltage.

Note 9: Time between ENx rising through VIN (ENx falling through VIN) and FLAGX falling through 0.3V when OUTX is connected to GND.

Pin Description

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

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

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

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″ section for more

details.

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