Datasheet > RT9451

RT9451

更新时间： 2024-02-25 23:54:12

品牌	Logo	应用领域
立锜 - RICHTEK		电池
页数	文件大小	规格书
37页	329K
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中文翻译

获取价格

技术参数
数据手册

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RT9451 技术参数

Status：	Active	Vin (min) (V)：	4.3
Vin (max) (V)：	12	Battery Charge Voltage (max) (V)：	4.44
Battery Charge Current (max) (A)：	4	Input Source：	AC Adapter;USB
Features：	Built-in Bootstrap Switch;Current Mode Control;Cycle-by-Cycle Current Limit;Internal Compensation;OCP;OVP	Package Type：	WQFN4x4-32

RT9451 数据手册

RT9451

Switch-Mode Single Cell Li-ion Battery Charger with USB OTG

General Description

The RT9451 integrates a high efficiency USB friendly switch

mode charger with On-The-Go (OTG) support for single

cell Li-ion and Li-polymer batteries,D+D− detection, and

a 50mA LDO regulator into a single chip.

In OTG mode, the PWM controller boosts the battery

voltage to 5V and provides up to 1.6A of current to the

USB output.At very light load, the Boost operates in burst

mode to optimize efficiency. OTG mode can be enabled

either through I²C interface orGPIO control.

The charger features a synchronous 375kHz PWM

controller with integrated power MOSFETs, input current

sensing and regulation, Minimum Input Voltage Regulation

(MIVR), high accuracy charge current and voltage

regulation, and charge termination. It charges the battery

in three phases : low current pre-charge, constant current

fast charge, and constant voltage trickle charge. The input

current is automatically limited to the value set by the

host. The charger can be configured to terminate charge

based on user-selectable minimum current level and

automatically restart the charge cycle if the battery voltage

falls below the recharge threshold. A safety timer with

reset control provides a safety backup for I²C interface.

The charger automatically enters sleep mode or high

impedance mode when the input supply is removed. The

charge status is reported to the host using the I²C interface

and the STAT pin. The D+D− detection circuit allows

automatic detection of a USB wall charger. If a wall charger

is detected, the input current limit will automatically

increase from 500mAto 975mA.

Applications

 Mobile Phones and Smart Phones

 MP3 Players

 HandheldDevices

Ordering Information

RT9451

Package Type

QW : WQFN-32L 4x4 (W-Type)

Lead Plating System

G : Green (Halogen Free and Pb Free)

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.

Simplified Application Circuit

RT9451

MID

VIN

MID

SCL

SDA

Control

Inputs

SYSS

Battery

VIO

USB Charger

Detection

BATS

GND

is a registered trademark of Richtek Technology Corporation.

DS9451-01 March 2017

www.richtek.com

12 3 4 5 6 7...37

中文翻译

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与RT9451相关器件

型号	品牌	获取价格	描述	数据表
RT9451_17	RICHTEK	获取价格	Switch-Mode Single Cell Li-ion Battery Charger
RT9451GQW	RICHTEK	获取价格	Switch-Mode Single Cell Li-ion Battery Charger
RT9455	RICHTEK	获取价格	暂无描述
RT9458	RICHTEK	获取价格	暂无描述
RT9460	RICHTEK	获取价格	暂无描述
RT9465	RICHTEK	获取价格	3A Single Cell Li-on Battery Slave Switching Charg
RT9465GQW	RICHTEK	获取价格	3A Single Cell Li-on Battery Slave Switching Charg
RT9466	RICHTEK	获取价格	暂无描述
RT9467	RICHTEK	获取价格	暂无描述
RT9468	RICHTEK	获取价格	暂无描述

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