General Description

The RT6585C 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

RT6585C provides a mode selection pin, SKIPSEL, to

select Diode-Emulation Mode (DEM) or Audio

Skipping Mode (ASM). Other features include onboard 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 RT6585C automatically switches to the

diode-emulation mode in light load applications. The

RT6585C is available in the WQFN-20L 3x3 package.

The recommended junction temperature range is

−40C to 125C.

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

⚫ Internal Frequency Setting

⚫ 500kHz/600kHz (CH1/CH2)

⚫ Internal Soft-Start and Soft-Discharge

⚫ 4700ppm/oC RDS(ON) Current Sensing

⚫ Independent Switcher Enable Control

⚫ Built in OVP/UVP/OCP/OTP

⚫ Non-latch UVLO

⚫ Power-Good Indicator

⚫ 20-Lead WQFN Package

Applications

⚫ Notebook and Sub-Notebook Computers

⚫ System Power Supplies

⚫ 3-Cell and 4-Cell Li+ Battery-Powered Device