Richtek RT8238BGQW

降压降压4.5V ~ 26V

Overview

The RT8238AGQW PWM controller provides high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high voltage batteries to generate low voltage CPU core, I/O, and chipset RAM supplies in notebook computers.The constant on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns "instant-on" response to load transients while maintaining a relatively constant switching frequency.The RT8238AGQW 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 and enter diode emulation mode at light load condition. The Audio Skipping Mode (ASM) setting maintains the switching frequency above 25kHz, which eliminates noise in audio applications. The buck conversion allows this device to directly step down high voltage batteries at the highest possible efficiency. The RT8238AGQW is intended for CPU core, chipset, DRAM, or other low voltage supplies as low as 0.5V. The RT8238AGQW is available in a WQFN-12L 2x2 package.

Features

Tape & Reel (TR) Package
Transistor Driver Output Type
Positive Output Configuration
Buck Topology
1 Number of Outputs
1 Output Phases
4.5V ~ 26V Voltage - Supply (Vcc/Vdd)
25kHz Frequency - Switching
Yes Synchronous Rectifier
No Clock Sync
Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start Control Features
Surface Mount Mounting Type