• Single-Series Cell Li-Ion Battery Fuel Gauge Resides on System Board
  • Integrated 2.5 VDC LDO
  • External Low-Value 10-mΩ Sense Resistor
• Patented Impedance Track™ Technology
  • Adjusts for Battery Aging, Self-Discharge, Temperature, and Rate Changes
  • Reports Remaining Capacity, State-of-Charge (SOC), and Time-to-Empty
  • Optional Smoothing Filter
  • Battery State-of-Health (Aging) Estimation
  • Supports Embedded or Removable Packs with up to 32A hr Capacity
  • Accommodates Pack Swapping With 2 Separate Battery Profiles
• Microcontroller Peripheral Supports:
  • 400-kHz I2C Serial Interface
  • 32 Bytes of Scratch-Pad FLASH NVM
  • Battery Low Digital Output Warning
  • Configurable SOC Interrupts
  • External Thermistor, Internal Sensor, or Host-reported Temperature Options
• Tiny 15-pin, 2610 × 1956 µm, 0.5-mm pitch NanoFree™ (DSBGA) Package

• Smartphones, Feature Phones, and Tablets
• Digital Still and Video Cameras
• Handheld Terminals
• MP3 or Multimedia Players

The Texas Instruments bq27520-G4 system-side 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. The fuel gauge resides on the main board of the system and manages an embedded battery (non-removable) or a removable battery pack.

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), temperature (°C), and state of health (%).

Battery fuel gauging requires only PACK+ (P+), PACK– (P–), and optional Thermistor (T) connections to a removable battery pack or embedded battery circuit. The device uses a 15-ball NanoFree™ (DSBGA) package in the nominal dimensions of 2610 × 1956 µm with 0.5-mm lead pitch. It is ideal for space-constrained applications.