1 mF

C VREF

LO 1.0 H

m

10nF

C BOOT

+

PACK -

PACK +

1mF

C AUXPWR

SCL

SDA

CSOUT

CSIN

PGND

SW

I2CBUS

bq24155

10kW

VAUX

HOST

SCL

SDA

STAT

VREF

STAT

PMID

VBUS

C IN

VBUS

C IN

1 F

m

4.7 F

m

BOOT

ISEL

U1

AUXPWR

ISEL

C O

1 0mF

R SNS

0.1 mF

10kW

10kW

10kW

SGND

bq24155

www.ti.com

SLUS942 – FEBRUARY 2010

Fully Integrated Switch-Mode One-Cell Li-Ion Charger with Full USB Compliance

Check for Samples: bq24155

1

FEATURES

2

•

Charge Faster than Linear Chargers

APPLICATIONS

•

Mobile and Smart Phones

•

High-Accuracy Voltage and Current Regulation

•

MP3 Players

–

Input Current Regulation Accuracy: ±5%

•

Handheld Devices

(100 mA and 500 mA)

–

Charge Voltage Regulation Accuracy:

DESCRIPTION

±0.5% (25°C), ±1% (0°C-125°C)

The bq24155 is a compact, flexible, high-efficiency,

–

Charge Current Regulation Accuracy: ±5%

USB-friendly

switch-mode

charge

management

•

High-Efficiency Mini-USB/AC Battery Charger

device for single-cell Li-ion and Li-polymer batteries

for Single-Cell Li-Ion and Li-Polymer Battery

used in a wide range of portable applications. The

Packs

charge parameters can be programmed through an

•

20-V Absolute Maximum Input Voltage Rating

PWM controller, power FETs, input current sensing,

•

6-V Maximum Operating Input Voltage

high-accuracy current and voltage regulation, and

•

Built-In Input Current Sensing and Limiting

charge termination, into a small WCSP package.

•

Integrated Power FETs for Up To 1.25-A

The bq24155 charges the battery in three phases:

Charge Rate

conditioning, constant current and constant voltage.

•

Programmable Charge Parameters through

The input current is automatically limited to the value

set by the host. Charge is terminated based on

user-selectable minimum current level. A safety timer

–

Input Current

–

Fast-Charge/Termination Current

interface.

During

normal

operation,

bq24155

–

Charge Voltage (3.5 V to 4.44 V)

automatically restarts the charge cycle if the battery

–

Safety Timer with Reset Control

voltage

falls

below

an

internal

threshold

and

automatically enters sleep mode or high impedance

–

Termination Enable

mode when the input supply is removed. The charge

•

Synchronous Fixed-Frequency PWM

Controller Operating at 3 MHz with 0% to

interface.

99.5% Duty Cycle

Typical Application Circuit

•

Automatic High Impedance Mode for Low

Power Consumption

•

Robust Protection

–

Reverse Leakage Protection Prevents

Battery Drainage

–

Thermal Regulation and Protection

–

Input/Output Overvoltage Protection

•

Status Output for Charging and Faults

•

USB Friendly Boot-Up Sequence

•

Automatic Charging

•

Power Up System without Battery

•

3.5 mm x 3.5 mm 14-Pin QFN Package

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

PRODUCTION DATA information is current as of publication date.

Copyright © 2010, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.