General Description

The RT8125H PWM controller provides high efficiency,

excellent transient response, and high DC output accuracy

needed for CPU core, I/O, and chipset RAM supplies in

notebook computers.

Richtek Mach ResponseTM technology is specifically

designed for providing 100ns “instant-on” response to

load transients while maintaining a relatively constant

switching frequency.

The RT8125H achieves high efficiency at a reduced cost

by eliminating the current sense resistor found in

traditional current mode PWMs. Efficiency is further

enhanced by its ability to drive very large synchronous

rectifier MOSFETs. The Buck conversion allows this device

to directly step down high voltage batteries at the highest

possible efficiency. The RT8125H provides an 1 high

accuracy 0.8V reference voltage with minimum 1mA

source/sink current for high accuracy output application.

Features

 Richtek Mach ResponseTM Technology

 1 High Accuracy 0.8V Reference

 VCC Input Range : 4.5V to 13.2V

 VOUT Operating Range : 0.3V to 3.3V

 Power Stage Input Range : 1.5V to 24V

 Fixed Operating Frequency : 300kHz

 VIN Detection

 LG_OCSET for Current Limit

 PGOOD Indicator

 Embedded Bootstrap Switch

 High Side Gate Driver Pull Low Resistor (10kΩ)

 Current Limit with Low Side Current Sense Scheme

 Enable Function with Mode Selection

 OVP/UVP/OTP/Pre-OVP/Current Limit

 Shutdown Current <100μA

 RoHS Compliant and Halogen Free

Applications

 Generic DC-DC Power Regulator

 Mother Boards and Desktop Servers