RT5753C datasheet(4/28 Pages) RICHTEK

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RT5753A/B/C/D

DS5753A/B/C/D-03 May 2022

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is a registered trademark of Richtek Technology Corporation.

Functional Block Diagram

Functional Pin Description

Pin No.

Pin Name

Pin Function

Output voltage sense. Sense the output voltage at the FB pin through a

resistive divider. The feedback reference voltage is 0.6V typically.

Open-drain power-good indicator output. Once being started-up, PG will be

pulled low to ground if any internal protection is triggered.

VIN

Power input. The input voltage range is from 2.5V to 6V. Connect a suitable

input capacitor between this pin and PGND pins, usually one 22

F or higher

than 22

F ceramic capacitors is recommended.

4, 9

(Exposed Pad)

PGND

Power ground. The exposed pad is internally unconnected which must be

soldered to a large PCB cooper area and connected to PGND for maximum

power dissipation.

No internal connection. Keep this pin floating.

Switch node between the internal switch and the synchronous rectifier.

Connect this pin to the inductor.

Enable control input. Connect this pin to logic high enables the device and

connect this pin to ground disables the device.

AGND

Analog ground.

VIN

PGND

VREF

Shutdown

Control

Driver

TON

Logic

Control

Current

Limit

Detector

Comparator

Error Amplifier

UVLO

OTP

VFB

Ramp

Generator

VIN

90%VREF

Discharge

Resistor

*OVP

AGND

*OVP : OVP is designed for RT5753AL/BL/CL/DL

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