Product Description

• The RT8205A/B/C dual step-down, switch-mode power supply controller generates logic-supply voltages in battery-powered systems.
• The RT8205A/B/C includes two pulse-width modulation (PWM) controllers fixed at 5V/ 3.3V or adjustable from 2V to 5.5V. An alternative LGATE1 output LG1_CP can be used for external charge pump (RT8205B). And an optional external charge pump can be monitored through SECFB (RT8205C). This device also features 2 linear regulators providing fixed 5V and 3.3V outputs.
• The linear regulator each provides up to 70mA output current with automatic linear-regulator bootstrapping to the PWM outputs. The RT8205A/B/C includes on-board power-up sequencing, the power-good output, internal soft- start, and internal soft-discharge output that prevents negative voltages on shutdown.
• TECHNICAL SHEET: https://pdf1.alldatasheet.com/datasheet-pdf/view/475847/RICHTEK/RT8205AGQW.html

• Wide Input Voltage Range 6V to 25V
• Dual Fixed 5V/3.3V Outputs or Adjustable from 2V to 5.5V, 1.5% Accuracy.
• Alternative LGATE1 Output (LG1_CP) acts as Clock for Charge Pump (RT8205B)
• Secondary Feedback Input Maintains Charge Pump Voltage (RT8205C)
• Fixed 3.3V and 5V LDO Output : 70mA
• 2V Reference Voltage ± 1% : 50μA
• Constant ON-Time Control with 100ns Load Step Response
• Frequency Selectable via TONSEL Setting
• RDS(ON) Current Sensing and Programmable Current Limit combined with Enable Control
• Selectable PWM, DEM, or Ultrasonic Mode
• Internal Soft-Start and Soft-Discharge
• High Efficiency up to 97%
• 5mW Quiescent Power Dissipation
• Thermal Shutdown
• RoHS Compliant and Halogen Free

• Notebook and Sub-Notebook Computers
• 3-Cell and 4-Cell Li+ Battery-Powered Devices