The RT6576C/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 RT6576C/D 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. A constant current ripple PWM control scheme operates without sense resistors and provides 100ns response to load transient. For maximizing power efficiency, the RT6576C/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 RT6576C/D is available in the WQFN-20L 3x3 package.
Feature
- 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
Applications
- Notebook and Sub-Notebook Computers
- System Power Supplies
- 2-Cell to 4-Cell Li+ Battery-Powered Devices
