RICHTEK RT6575DGQW(2)

The RT6575C/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 RT6575C/D 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 RT6575C/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 RT6575C/D is available in the WQFN-20L 3×3 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
• 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

• Notebook and Sub-Notebook Computers
• System Power Supplies
• 2-Cell to 4-Cell Li+ Battery-Powered Devices