®
RT6575E
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 RT6575E 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 RT6575E has an oscillator
output to drive 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
RT6575E automatically switches to the diode-emulation
mode in light load applications. The RT6575E is available
in the WQFN-20L 3x3 package.
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
RoHS Compliant and Halogen Free
Simplified Application Circuit
V
IN
UGATE2
VIN
RT6575E
BOOT2
UGATE1
BOOT1
PHASE2
LGATE2
V
OUT2
V
OUT1
PHASE1
LGATE1
FB2
CS1
CS2
BYP1
FB1
LDO5
5V
Channel 1 Enable
Channel 2 Enable
EN1
PGOOD
LDO3
icator
PGOOD Ind
EN2
3.3V
VCLK
GND
Copyright 2018 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS6575E-00 August 2018
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
