Datasheet > RT8238B

RT8238B

更新时间： 2024-01-07 02:19:44

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
15页	226K
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技术参数
数据手册

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RT8238B 技术参数

Status：	Active	Vs (typ) (V)：	5
Vin (min) (V)：	4.5	Vin (max) (V)：	26
Vout (min) (V)：	0.5	Vout (max) (V)：	3.3
Preset Vout (V)：		Output Adj. Method：	Resistor
Accuracy (+/- %)：	1	Freq (typ) (kHz)：	300
Freq (min) (kHz)：	200	Freq (max) (kHz)：	500
Iq (typ) (mA)：	0.5	Features：	OVP;Power Good;Selectable (PSM or PWM);UVP;Ultrasonic Mode Control
Package Type：	WQFN2x2-12

RT8238B 数据手册

RT8238B

Single Synchronous Buck PWM Controller

General Description

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 R_DS(ON)Sensing

The RT8238B PWM controller provides high efficiency,

excellent transient response, and highDC output accuracy

needed for stepping down high voltage batteries to

generate low voltage CPU core, I/O, and chipset RAM

supplies in notebook computers.

 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

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 RT8238B 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

RT8238B is intended for CPU core, chipset, DRAM, or

other low voltage supplies as low as 0.5V. The RT8238B

is available in a WQFN-12L 2x2 package.

 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

 GenericDC/DC Power Regulator

Pin Configurations

(TOP VIEW)

Ordering Information

RT8238B

12 11 10

Package Type

QW : WQFN-12L 2x2 (W-Type)

LGATE

PGOOD

GND

PHASE

UGATE

Lead Plating System

G : Green (Halogen Free and Pb Free)

MODE

Note :

Richtek products are :

 RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

 Suitable for use in SnPb or Pb-free soldering processes.

WQFN-12L 2x2

Marking Information

3Y : Product Code

W : Date Code

3YW

is a registered trademark of Richtek Technology Corporation.

DS8238B-00 July 2015

www.richtek.com

12 3 4 5 6 7...15

中文翻译

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与RT8238B相关器件

型号	品牌	获取价格	描述	数据表
RT8239A	RICHTEK	获取价格	暂无描述
RT8239AGQW	RICHTEK	获取价格	High Efficiency, Main Power Supply Controller for Notebook Computers
RT8239AZQW	RICHTEK	获取价格	High Efficiency, Main Power Supply Controller for Notebook Computers
RT8239B	RICHTEK	获取价格	暂无描述
RT8239BGQW	RICHTEK	获取价格	High Efficiency, Main Power Supply Controller for Notebook Computers
RT8239BZQW	RICHTEK	获取价格	High Efficiency, Main Power Supply Controller for Notebook Computers
RT8239C	RICHTEK	获取价格	暂无描述
RT8239CGQW	RICHTEK	获取价格	High Efficiency, Main Power Supply Controller for Notebook Computers
RT8239CZQW	RICHTEK	获取价格	High Efficiency, Main Power Supply Controller for Notebook Computers
RT8240A	RICHTEK	获取价格	暂无描述

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