BQ27520-G4 System Side Impedance Track™ Fuel Gauge With Integrated LDO. | TI.com

BQ27520-G4 (ACTIVE)

System Side Impedance Track™ Fuel Gauge With Integrated LDO.

 

Description

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.

Features

  • 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

Parametrics

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Part number Order Number of series cells Cell chemistry Battery capacity (Max) (mAh) Communication interface Battery capacity (Min) (mAh) External capacity indication Implementation Gas gauge algorithm Cell balancing Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
BQ27520-G4 Order now Single Cell     Li-Ion/Li-Polymer     32000     I2C     100     None     System     Impedance Track    
   
   
-40 to 85     DSBGA | 15     See datasheet (DSBGA)    
BQ27220 Order now Single Cell     Li-Ion/Li-Polymer     29000     I2C     100     None     Pack
System    
CEDV    
   
   
-40 to 85     DSBGA | 9     See datasheet (DSBGA)    
BQ27320 Order now Single Cell     Li-Ion/Li-Polymer     29000     I2C     100     None     Pack
System    
CEDV    
   
   
-40 to 85     DSBGA | 15     See datasheet (DSBGA)    
BQ27426 Order now Single Cell     Li-Ion/Li-Polymer     14000     I2C     100     None     System     Impedance Track    
   
   
-40 to 85     DSBGA | 9     See datasheet (DSBGA)    
BQ27546-G1 Order now Single Cell     Li-Ion/Li-Polymer     32000     HDQ
I2C    
100     None     Pack     Impedance Track    
   
SHA-1 Authentication     -40 to 85     DSBGA | 15     See datasheet (DSBGA)    
BQ27621-G1 Order now Single Cell     Li-Ion/Li-Polymer     32000     I2C     100     None     System     Dynamic Voltage Correlation    
   
No Sense Resistor Required     -40 to 85     DSBGA | 9     See datasheet (DSBGA)    
BQ35100 Order now Single Cell     Primary Lithium     32000     I2C     100     None     Pack
System    
Primary    
   
End of Service     -40 to 85     TSSOP | 14     14TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 14)