APR349

Document number: DS43554 Rev. 2 - 2

2 of 10

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July 2021

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APR349

Pin Descriptions

Pin Number

Pin Name

Function

1

VDD

Supply input. It provides bias voltage for the internal logic circuit and the MOSFET driver.

2

GND

Ground, also used as FET source sense reference for DRAIN

3

GATE

Synchronous Rectification MOSFET Gate Drive

4

Rx

Program a voltage reference with a resistor from Rx to GND, to enable synchronous rectification

MOSFET drive signal

5

DRAIN

Synchronous Rectification MOSFET Drain Voltage Sense Input

6

VOUT

Internal Linear Regulator Input

Functional Block Diagram

VON_TH

LEB

Time

Integrator

∫(VDRAIN-VCC)dt

VOUT

Driver

GATE

Rx

DRAIN

VDD

GND

VOUT

4

3

5

6

1

2

PLR

DRAIN

LDO

VREF

S1

VDRAIN Sensing

One-Shot Pulse

I

tOFF_MIN

Driver

ON

OFF

Control

Core

VON_OFF

VON_REG