General Description

The RT8205L/M is a dual step-down, switch mode power supply controller generating logic-supply voltages in battery powered systems. It includes two Pulse-Width Modulation (PWM) controllers adjustable from 2V to 5.5V, and also features fixed 5V/3.3V linear regulators. Each linear regulator provides up to 100mA output current with automatic linear regulator bootstrapping to the PWM

outputs. An optional external charge pump can be monitored through SECFB (RT8205M). The RT8205L/M includes on-board power up sequencing, a power good output, internal soft-start, and internal soft-discharge output that prevents negative voltage during shutdown.

Features

Constant On-time Control with 100ns Load Step Response

Wide Input Voltage Range : 6V to 25V

Dual Adjustable Outputs from 2V to 5.5V

Secondary Feedback Input Maintains Charge Pump Voltage (RT8205M)

Fixed 3.3V and 5V LDO Output : 100mA

2V Reference Voltage

Frequency Selectable via TONSEL Setting

4700ppm/°C RDS(ON)Current Sensing

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

Applications

Notebook and Sub-Notebook Computers

3-Cell and 4-Cell Li+ Battery-Powered Devices