Datasheet

LM5033

SNVS181B –APRIL 2004–REVISED APRIL 2013

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PIN DESCRIPTIONS

PIN NAME DESCRIPTION APPLICATION INFORMATION

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

with transient capability to 100V .

2 REF 2.5V precision reference output Sink only, requires an external pull-up resistor. This can

be used as a reference for external circuitry.

3 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 5kΩ

pullup to +5.2V.

4 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.

5 OUT1 Gate Driver Output #1 Alternating output gate driver, which can source and sink

1.5A.

6 OUT2 Gate Driver Output #2 Alternating output gate driver, which can source and sink

1.5A.

7 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.

8 CS 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.

9 R

/ 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.

10 SS 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.

Product Folder Links: LM5033