bq27741-G1 Single-Cell Li-Ion Battery Fuel Gauge with Integrated Protection

1 Features

• 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.

1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Schematic

4 Revision History

Changes from B Revision (April 2015) to C Revision

• Changed Pin Configuration and FunctionsGo
• Changed Absolute Maximum RatingsGo
• Changed Recommended Operating ConditionsGo
• Deleted UNDERTEMPERATURE FAULT ModeGo
• Added Community ResourcesGo

5 Device Comparison Table

6 Pin Configuration and Functions

YZF Package

15-Pin DSBGA