RT9451 datasheet(4/37 Pages) RICHTEK

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RT9451

DS9451-00

September 2013

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Function Block Diagram

Operation

The RT9451 is designed for single cell Li-Ion battery charger

in portable applications.

Base Circuits

Base circuits provide the internal power, VDD and reference

voltage and bias current.

Protection Circuits

The protection circuits include the OVP, UVLO and OTP

circuits. The protection circuits turn off the charging when

the input power or die temperature is in abnormal level.

Switching Charger

The switching charger controls the operation during the

charging process. The controller will make sure the battery

is well charged in a suitable current, voltage, and die

temperature.

Logic Circuits

The STAT and INT indicate the charger and interrupt

condition. During the charging process, the STAT pin is

pulled low and pulled high when the charger is under

abnormal condition or charge done. The INT pin indicates

the fault condition. When any fault occurs, the INT is pulled

low.

LDO

The RT9451 provides a 50mA LDO to support the peripheral

circuits. The output voltage is regulated to 4.9V and the

maximum output current is 120mA.

OSC

The oscillator runs at fixed 375kHz frequency for the PWM

control of switching charger.

2C Interface

The I

2C interface is used to program battery voltage, charge

current, termination current, MIVR level, and OTG voltage.

D+/D

−−−−− Detection

The D+/D

− detection can detect the devices which are

inserted to the USB connector.

D+/D-

Detection

Switching

Charger

LDO

BASE

OSC

Protection

Logic

Interface

VREF

IBIAS

VDDP

ISENL

BATS

ISENR

PGND

STAT

LDO

VIN

VIO

SDA

SCL

MID

OTG

INT

MID_LDO

GND

BOOT

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