RT9451 datasheet(2/37 Pages) RICHTEK

2 / 37 page

RT9451

DS9451-00

September 2013

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Pin Configurations

WQFN-32L 4x4

(TOP VIEW)

VIN

PGND

VIO

INT

VDDP

GND

BOOT

MID_LDO

10 11 12 13

31 30 29 28

GND

Features

Integrated Switching Charger and 50mA LDO in a

Single Package

Charges Faster Than Linear Chargers

High Accuracy Voltage and Current Regulation

Charge Voltage Regulation Accuracy :

±±±±±1%

Charge Current Regulation Accuracy :

±±±±±5%

Minimum Input Voltage Regulation : 4.2V to 4.76V

with Step of 80mV

Bad Adaptor Detection and Rejection

Safety Limit Register for Maximum Charge Voltage

and Current Limiting

High Efficiency Mini-USB/AC Battery Charger for

Single Cell Li-Ion and Li-Polymer Battery Packs

28V Absolute Maximum Input Voltage Rating

12V Maximum Operating Input Voltage

Built-In Input Current Sensing and Limiting

Integrated Power FETs for Up to 4A Charge Rate

Programmable Charge Parameters through I2C

Interface (up to 400 Kbps) :

Input Current

Fast Charge/Termination Current

Charge Voltage (3.5V to 4.44V)

Safety Timer

Termination Enable

Synchronous Fixed Frequency PWM Controller

Operating at 375kHz With 0% to 99% Duty Cycle

Automatic High Impedance Mode for Low Power

Consumption

Safety Timer with Reset Control

Thermal Regulation and Protection

Input/Output Over-Voltage Protections

Status Output for Charging and Faults

USB Friendly Boot-Up Sequence

Automatic Charging

Boost Mode Operation for USB OTG

Input Voltage Range (BATS) : 2.5V to 4.5V

Output Voltage for VIN : 4.425V to 5.506V

RoHS Compliant and Halogen Free

Marking Information

0Q=YM

DNN

0Q= : Product Code

YMDNN : Date Code

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