RT5797B

Copyright © 2022 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

DS5797B-06

April 2022

www.richtek.com

1

3A, 1MHz, 6V CMCOT Synchronous Step-Down Converter

General Description

The RT5797B is a high efficiency synchronous step-

down DC-DC converter. Its input voltage range is from

2.7V to 6V and provides an adjustable regulated output

voltage from 0.6V to 3.4V while delivering up to 3A of

output current.

The internal synchronous low on-resistance power

switches increase efficiency and eliminate the need for

an

external

Schottky diode.

The Current

Mode

Constant-On-time (CMCOT) operation with internal

compensation allows the transient response to be

optimized over a wide range of loads and output

capacitors. The RT5797B is available in the WDFN-8L

2x2 package.

Marking Information

2S : Product Code

W : Date Code

2SW

RT5797BLGQW

2T : Product Code

W : Date Code

2TW

RT5797BHGQW

Features

⚫

Efficiency Up to 95%

⚫

RDSON 100m HS / 70m LS

⚫

VIN Range 2.7V to 6V

⚫

VREF 0.6V with 1% Accuracy at 25C

⚫

CMCOT

™ Control Loop Design for Best

Transient Response, Robust Loop Stability with

Low-ESR (MLCC) COUT

⚫

Soft-Start 1.2ms

Applications

⚫

STB, Cable Modem, & xDSL Platforms

⚫

LCD TV Power Supply & Metering Platforms

⚫

General Purpose Point of Load (POL)

Ordering Information

Package Type

QW : WDFN-8L 2x2 (W-Type)

RT5797B

Lead Plating System

G : Green (Halogen Free and Pb Free)

UVP Option

H : Hiccup

L : Latched-Off

Note :

Richtek products are :



RoHS compliant and compatible with the current

requirements of IPC/JEDEC J-STD-020.



Suitable for use in SnPb or Pb-free soldering processes.

Simplified Application Circuit

VIN

PGND

RT5797B

CIN

EN

VOUT

R1

LX

L

R2

VIN

FB

COUT

PG

SGND