Datasheet > RT6545BGQW

RT6545BGQW

更新时间： 2022-02-26 11:49:27

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
21页	260K
描述
Dual-Channel Synchronous DC/DC Step-Down Controller with 5V/3.3V LDOs

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RT6545BGQW 数据手册

RT6545A/B

Dual-Channel Synchronous DC/DC Step-Down Controller

with 5V/3.3V LDOs

General Description

Features

^Support Connected Standby Mode for Ultrabook

^CCRCOT Control with 100ns Load Step Response

^PWM Maximum Duty Ratio > 98%

^5V to 25V Input Voltage Range

^Dual Adjustable Output :

The RT6545A/B is a dual-channel step-down, controller

generating supply voltages for battery-powered systems.

It includes two Pulse-Width Modulation (PWM) controllers

adjustable from 2V to 5.5V, and two fixed 5V/3.3V linear

regulators. Each linear regulator provides up to 100mA

output current and 3.3V linear regulator provides 1%

accuracy under 35mA. The RT6545A/B has an oscillator

output to driver the external charge pump application. Other

features include on-board power-up sequencing, a power-

good output, internal soft-start, and soft-discharge output

that prevents negative voltage during shutdown.

 CH1 : 2V to 5.5V

 CH2 : 2V to 4V

^5V/3.3V LDOs with 100mA Output Current

^1% Accuracy on 3.3V LDO Output

^Oscillator Driving Output for Charge Pump

Application

 Internal Frequency Setting

A constant current ripple PWM control scheme operates

without sense resistors and provides 100ns response to

load transient. For maximizing power efficiency, the

RT6545A/B automatically switches to the diode-emulation

mode in light load applications. The RT6545A/B is available

in the WQFN-20L 3x3 package.

^400kHz/475kHz (CH1/CH2)

 Internal Soft-Start and Soft-Discharge

 4700ppm/°C R_DS(ON)Current Sensing

 Independent Switcher Enable Control

 Built in OVP/UVP/OCP/OTP

 Non-latch UVLO

 Power Good Indicator

 RoHS Compliant and Halogen Free

Simplified Application Circuit

UGATE2

VIN

RT6545A/B

BOOT2

UGATE1

BOOT1

PHASE2

LGATE2

OUT2

OUT1

PHASE1

LGATE1

FB2

CS1

CS2

BYP1

LDO5

FB1

EN1

Channel 1 Enable

Channel 2 Enable

PGOOD

LDO3

dicator

PGOOD In

EN2

3.3V

Off

GND

is a registered trademark of Richtek Technology Corporation.

DS6545A/B-00 May 2016

www.richtek.com

12 3 4 5 6 7...21

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