Dual-Channel Synchronous DC/DC Step-Down Controller
Description
®
RT6576E
Dual-Channel Synchronous DC/DC Step-Down Controller with 5V/3.
3V LDOs
General Description
The RT6576E 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 RT6576E 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 RT6576E 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 RT6576E 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
Simplified Application Circuit
VIN
VOUT1
Channel 1 Enable Channel 2 Enable
VIN UGATE2 RT6576E BOOT2
UGATE1 BOOT1
PHASE2 LGATE2
PHASE1
LGATE1
FB2 CS1
BYP1
CS2
FB1 EN1 EN2 VCLK
LDO5
PGOOD LDO3
GND
VOUT2
5V PGOOD Indica...
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