LM5068

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SNVS254B – MAY 2004 – REVISED DECEMBER 2004

Pin Description (continued)

PIN

NAME

DESCRIPTION

APPLICATION INFORMATION

5

SENSE

Current Sense Input

Load current is monitored via an external current sense

fault timer is initiated. Load current is actively limited to

catastrophic fault, the fast gate pull down circuit will reduce

the MOSFET gate voltage and initiate active current

limiting.

6

GATE

N-Channel MOSFET Gate Drive Output

This output is pulled high by a 60 µA current source to turn

on the MOSFET.

7

TIMER

Timer Input

An external capacitor connected to this pin sets the initial

start-up delay and the delay to shutdown in the event of an

over-current condition. This pin is also used for the

automatic re-try timing sequence, following fault shutdown

(-2 and –4 versions).

8

Positive Supply Voltage Input

Configuration Table

Part Number

Latch Off /Successive Re-try

Power Good Polarity

Package

LM5068MM-1/MMX-1

Latch Off

Active HIGH

MSOP- 8

LM5068MM-2/MMX-2

Auto Re-try

Active HIGH

LM5068MM-3/MMX-3

Latch Off

Active LOW

LM5068MM-4/MMX-4

Auto Re-try

Active LOW

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Absolute Maximum Ratings

(1)

100V

100V

8V

8V

16V

+150°C

-55°C to +150°C

Soldering Information

2kV

(1)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which

operation of the device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.

(2)

The ESD rating of Pin 7 is 1.5kV. It is recommended that proper ESD precautions are taken to avoid performance degradation or loss of

functionality.

Operating Ratings

10V to 90V

Junction Temp. Range

−40°C to +105°C

Copyright © 2004, Texas Instruments Incorporated

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