Datasheet > RT8228B

RT8228B

更新时间： 2024-09-25 19:54:47

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
15页	259K
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RT8228B 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)：	600
Iq (typ) (mA)：	0.5	Features：	Adjustable Current Limit;Adjustable Frequency;Built-in Bootstrap Switch;COT Control;Cycle-by-Cycle Current Limit;Diode Emulation Mode;Enable Input;OVP;Power Good;SCP;Selectable (PSM or PWM);Stable with Ceramic Capacitor;UVP
Package Type：	WQFN2x2-12

RT8228B 数据手册

RT8228B

Single Synchronous Buck PWM Controller

General Description

Features

z Built in 1% 0.5V Reference Voltage

z Adjustable 0.5V to 3.3V Output Range

z Support Pure MLCC Output Capacitor

z Quick Load Step Response within 100ns

z 4700ppm/°C Programmable Current Limit by Low

Side R_DS(ON)Sensing

The RT8228B 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.

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.

z 4.5V to 26V Battery Input Range

z Resistor Programmable Frequency

z Internal Ramp Current Limit Soft-Start Control

z Drives Large Synchronous Rectifier FETs

z Integrated Boost Switch

The RT8228B 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 buck conversion allows this device

to directly step down high voltage batteries at the highest

possible efficiency. The RT8228B is intended for CPU core,

chipset, DRAM, or other low voltage supplies as low as

0.5V. The RT8228B is available in a WQFN-12L 2x2

package.

z Over/Under Voltage Protection

z Thermal Shutdown

z Power Good Indicator

z RoHS Compliant and Halogen Free

Applications

z Notebook Computers

z CPU Core Supply

z Chipset/RAM Supply as Low as 0.5V

z GenericDC/DC Power Regulator

Ordering Information

RT8228B

Pin Configurations

Package Type

(TOP VIEW)

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

Lead Plating System

12 11 10

G : Green (Halogen Free and Pb Free)

Z : ECO (Ecological Element with

Halogen Free and Pb free)

LGATE

PGOOD

GND

PHASE

UGATE

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

is a registered trademark of Richtek Technology Corporation.

DS8228B-06 January 2014

www.richtek.com

12 3 4 5 6 7...15

中文翻译

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RT8231C	RICHTEK	获取价格	暂无描述
RT8234A	RICHTEK	获取价格	Single Synchronous Buck PWM Controller with LDO Regulator
RT8237C	RICHTEK	获取价格	暂无描述

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