General Description

The RT6575C/D 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 RT6575C/D has an oscillator

output to drive the external charge pump application. Other

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

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

that prevents negative voltage during shutdown.

A constant current ripple PWM control scheme operates

without sense resistors and provides 100ns response to

load transient. For maximizing power efficiency, the

RT6575C/D automatically switches to the diode-emulation

mode in light load applications. To eliminate noise in audio

applications, an audio-skipping mode is included, which

maintains the switching frequency above 25kHz. The

RT6575C/D is available in the WQFN-20L 3x3 package.

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 :

? 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

? Support Audio-Skipping Mode (ASM)

? Internal Frequency Setting

? 300kHz/355kHz (CH1/CH2)

? Internal Soft-Start and Soft-Discharge

? 4700ppm/°C RDS(ON) Current Sensing

? Independent Switcher Enable Control

? Built-in OVP/UVP/OCP/OTP

? Non-Latch UVLO

? Power Good Indicator