LM5033MMXSLASHNOPB datasheet(2/24 Pages) TI

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LM5033

SNVS181B – APRIL 2004 – REVISED APRIL 2013

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PIN DESCRIPTIONS

NAME

DESCRIPTION

APPLICATION INFORMATION

Vin

Input Voltage

Input to the start-up regulator. Input range is 15V to 90V,

with transient capability to 100V .

REF

2.5V precision reference output

Sink only, requires an external pull-up resistor. This can

be used as a reference for external circuitry.

COMP

PWM Input

Feedback to the PWM comparator’s inverting input,

through a 3:1 divider. The output duty cycle increases as

this pin’s voltage increases. Internally there is a 5k

Ω

pullup to +5.2V.

VCC

9.6V output from the internal high voltage series pass

An external voltage (10V - 15V) can be applied to this pin

regulator

to shutdown the internal regulator, thereby reducing

internal dissipation. An internal diode connects Vcc to

Vin.

OUT1

Gate Driver Output #1

Alternating output gate driver, which can source and sink

1.5A.

OUT2

Gate Driver Output #2

Alternating output gate driver, which can source and sink

1.5A.

GND

Ground pin for all internal circuitry

Connections to external ground must be done with care

for optimum performance. See the Functional Description

and Application Information Section for more information.

Current sense input

Current sense input for the current limit detection. If CS

exceeds 0.5V the outputs are disabled and the softstart

pin is discharged to ground.

RT/ SYNC

Oscillator timing resistor pin and synchronization input

An external resistor to ground sets the oscillator

frequency. This pin will also accept ac-coupled

synchronization pulses from an external source.

Softstart pin

An internal 10µA current source and an external

capacitor set the soft-start timing. This pin can be

externally pulled to below 0.5V to disable the output

drivers.

WSON

SUB

Die Substrate

The exposed die attach pad on the WSON package

DAP

should be connected to a PCB thermal pad at ground

potential. For additional information on using Texas

Instruments's No Pull Back WSON package, please refer

to Application Note AN-1187.

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