HostSystem

Power

Management

Controller

I C

2

LDO

Battery

Low

Warning

bq27500

Battery

Good

Voltage

Sense

Temp

Sense

Current

Sense

PACK–

PACK+

T

Single-CellLi-Ion

BatteryPack

FETs

CHG

DSG

Protection

IC

bq27500-V130

www.ti.com

SLUS914A – OCTOBER 2009 – REVISED DECEMBER 2009

System-Side Impedance Track Fuel Gauge

Check for Samples: bq27500-V130

1

INTRODUCTION

1.1

FEATURES

1.2

APPLICATIONS

1234

• Battery Fuel Gauge for 1-Series Li-Ion

•

Smart Phones

Applications

•

PDAs

• Resides on System Main Board

•

Digital Still and Video Cameras

– Works With Embedded or Removable

•

Handheld Terminals

Battery Packs

•

MP3 or Multimedia Players

• Uses PACK+, PACK–, and T Battery Terminals

• Microcontroller Peripheral Provides:

1.3

DESCRIPTION

– Accurate Battery Fuel Gauging

– Internal Temperature Sensor for System

The Texas Instruments bq27500 system-side Li-Ion

Temperature Reporting

battery fuel gauge is a microcontroller peripheral that

– Battery Low Interrupt Warning

provides fuel gauging for single-cell Li-Ion battery

– Battery Insertion Indicator

packs.

The

device

requires

little

system

– 96 Bytes of Non-Volatile Scratch-Pad FLASH

microcontroller firmware development. The bq27500

• Battery Fuel Gauge Based on Patented

resides on the system main board and manages an

Impedance Track™ Technology

embedded battery (non-removable) or a removable

– Models the Battery Discharge Curve for

battery pack.

Accurate Time-to-Empty Predictions

The bq27500 uses the patented Impedance Track

– Automatically Adjusts for Battery Aging,

algorithm for fuel gauging, and provides information

Battery Self-Discharge, and

such

as

remaining

battery

capacity

(mAh),

Temperature/Rate Inefficiencies

state-of-charge (%), run-time to empty (min.), battery

– Low-Value Sense Resistor (10 m

Ω or Less)

voltage (mV), and temperature (°C).

Microcontroller Port

Battery fuel gauging with the bq27500 requires only

• 12-Pin 2,5-mm × 4-mm SON Package

PACK+ (P+), PACK– (P–), and Thermistor (T)

connections

to

a

removable

battery

pack

or

embedded battery.

TYPICAL APPLICATION

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

Impedance Track, bqEASY are trademarks of Texas Instruments.

3

I2C is a trademark of NXP B.V.

4

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009, 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.