RT9451 datasheet(1/37 Pages) RICHTEK

部件名	RT9451

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

PDF	37 Pages

Scroll/Zoom	100%

制造商	RICHTEK [Richtek Technology Corporation]

网页	http://www.richtek.com

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1 / 37 page

RT9451

®

DS9451-00

September 2013

www.richtek.com

1

©

Copyright

is a registered trademark of Richtek Technology Corporation.

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.

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 500mA to 975mA.

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 I

2C interface or GPIO control.

Simplified Application Circuit

RT9451

+ Battery

BATS

LX

VIN

CIN

CSYSS

L

MID

CMID

GND

DP

VIO

DM

SDA

SCL

Control

Inputs

USB Charger

Detection

Ordering Information

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.

Applications

Mobile Phones and Smart Phones

MP3 Players

Handheld Devices

RT9451

Package Type

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

Lead Plating System

G : Green (Halogen Free and Pb Free)

类似零件编号 - RT9451

制造商	部件名	数据表	功能描述
Richtek Technology Corp...	RT9451GQW	319Kb / 37P	Switch-Mode Single Cell Li-ion Battery Charger
Richtek Technology Corp...	RT9451	319Kb / 37P	Switch-Mode Single Cell Li-ion Battery Charger

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类似说明 - RT9451

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NXP Semiconductors	NE57611	131Kb / 12P	Single cell Li-ion battery charger 2003 Oct 15
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