1 Features

1• Battery Fuel Gauge and Protector for 1-Series Li-

Ion Applications

• Microcontroller Peripheral Provides:

– Accurate Battery Fuel Gauging Supports up to

14,500 mAh

– External and Internal Temperature Sensors for

Battery Temperature Reporting

– Precision 16-Bit High-Side Coulomb Counter

with High-Side Low-Value Sense Resistor

(5 mΩ to 20 mΩ)

– Lifetime and Current Data Logging

– 64 Bytes of Non-Volatile Scratch Pad Flash

– SHA-1/HMAC Authentication

• Battery Fuel Gauging Based on Patented

Impedance Track™ Technology

– Models Battery Discharge Curve for Accurate

Time-To-Empty Predictions

– Automatically Adjusts for Aging, Self-

Discharge, and Temperature- and Rate-

Induced Effects on Battery

• Advanced Fuel Gauging Features

– Internal Short Detection

– Tab Disconnection Detection

• Safety and Protection:

– Over- and Undervoltage Protection with Low-

Power Mode

– Overcharging and Discharging Current

Protection

– Overtemperature Protection

– Short-Circuit Protection

– Low-Voltage Notification

– Voltage Doubler to Support High-Side

N-Channel FET Protection

• HDQ and I2C Interface Formats for

Communication with Host System

• Small 15-Ball NanoFree™ (BGA) Packaging

2 Applications

• Smartphones

• PDAs

• Digital Still and Video Cameras

• Handheld Terminals

• MP3 or Multimedia Players

3 Description

The Texas Instruments bq27741-G1 Li-Ion battery

fuel gauge is a microcontroller peripheral that

provides fuel gauging for single-cell Li-Ion battery

packs. The device requires little system

microcontroller firmware development for accurate

battery fuel gauging. The fuel gauge resides within

the battery pack or on the system’s main board with

an embedded battery (non-removable). The fuel gauge provides hardware-based over- and

undervoltage, overcurrent in charge or discharge, and

short-circuit protections.

The fuel gauge uses the patented Impedance

Track™ algorithm for fuel gauging, and provides

information such as remaining battery capacity

(mAh), state-of-charge (%), run-time to empty

(minimum), battery voltage (mV), and temperature

(°C), as well as recording vital parameters throughout

the lifetime of the battery.

The device comes in a 15-ball BGA package

(2.776 mm × 1.96 mm) that is ideal for space-

constrained applications.