Dual-Channel Synchronous DC/DC Step-Down Controller
with 5V/3.3V LDOs
The RT6585A/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 RT6585A/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.
A constant current ripple PWM control scheme operates
without sense resistors and provides 100ns response to
load transient. For maximizing power efficiency, the
RT6585A/B automatically switches to the diode-emulation
mode in light load applications. The RT6585A/B is available
in the WQFN-20L 3x3 package.
Support Connected Standby Mode for Ultrabook
CCRCOT Control with 100ns Load Step Response
PWM Maximum Duty Ratio > 98%
5V to 25V Input Voltage Range
2V to 5.5V Output Voltage Range
5V/3.3V LDOs with 100mA Output Current
1% Accuracy on 3.3V LDO Output
Oscillator Driving Output for Charge Pump
Internal Frequency Setting
Internal Soft-Start and Soft-Discharge
4700ppm/°C RDS(ON) Current Sensing
Independent Switcher Enable Control
Built in OVP/UVP/OCP/OTP
Power Good Indicator
RoHS Compliant and Halogen Free
Simplified Application Circuit
Channel 1 Enable
Channel 2 Enable
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS6585A/B-02 June 2014
is a registered trademark of Richtek Technology Corporation.