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IC / CP / RT8238A / WQFN-12-2X2

تولید کننده: Richtek
مدل کالا: RT8238A
موجودی:
تماس 8893- 6186
قیمت: 0تومان

CP - RT8238A – Richtek - WQFN-12-2X2

Single Synchronous Buck PWM Controller

تنها کنترل کننده باک PWM

 

General Description

 

The RT8238A 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 RT8238A 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 RT8238A is intended for CPU core, chipset, DRAM, or other low voltage supplies as low as 0.5V. The RT8238A is available in a WQFN-12L 2x2 package

 

Features

 

Built in 1% 0.5V Reference Voltage

Adjustable 0.5V to 3.3V Output Range

Quick Load Step Response within 100ns

4700ppm/°C Programmable Current Limit by Low Side RDS(ON) Sensing

4.5V to 26V Battery Input Range

Resistor Programmable Frequency

Internal Ramp Current Limit Soft-Start Control

Drives Large Synchronous Rectifier FETs

Integrated Boost Switch

Over/Under Voltage Protection

Thermal Shutdown

Power Good Indicator

RoHS Compliant and Halogen Free

 

Applications

 

Notebook Computers

CPU Core Supply

Chipset/RAM Supply as Low as 0.5V

Generic DC/DC Power Regulator

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