BQ27621-G1 System-Side Fuel Gauge with Dynamic Voltage Correlation, Battery Gas Gauge | TI.com

BQ27621-G1 (ACTIVE)

System-Side Fuel Gauge with Dynamic Voltage Correlation, Battery Gas Gauge

 

Description

The Texas Instruments bq27621-G1 is a minimally configured microcontroller peripheral that provides system-side fuel gauging for single-cell Li-Ion batteries. The device requires very little user configuration and system microcontroller firmware development.

The bq27621-G1 uses the Dynamic Voltage Correlation algorithm for fuel gauging. This process eliminates the need for a sense resistor when calculating remaining battery capacity (mAh), state-of-charge (%), battery voltage (mV), and temperature (°C).

Battery fuel gauging with the bq27621-G1 requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery circuit. The tiny 9-pin, 1.62 mm × 1.58 mm, 0.5 mm pitch YZF package is ideal for space-constrained applications.

Features

  • Single-Cell Li-Ion Battery Fuel Gauge
    • Resides on System Board
    • Supports Embedded or Removable Batteries
    • Powered Directly from Battery with Integrated
      LDO
  • Easy To Configure Fuel Gauging Based on the
    Dynamic Voltage Correlation Algorithm
    • Reports Remaining Capacity and State of
      Charge (SOC) with Smoothing Filter
    • Automatically Adjusts for Self-Discharge,
      Temperature, and Rate Changes
  • Microcontroller Peripheral Supports:
    • 400-kHz I2C Serial Interface
    • Configurable SOC Interrupt or
      Battery Low Digital Output Warning
    • Internal Temperature Sensor or
      Host Reported Temperature
  • Support 4.2-V, 4.3-V, and 4.35-V Chemistries
  • 9-pin 1.62 × 1.58 mm, 0.5 mm pitch YZF 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)
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)    
BQ27220 Order now Single Cell     Li-Ion/Li-Polymer     29000     I2C     100     None     Pack
System    
CEDV    
   
   
-40 to 85     DSBGA | 9     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)    
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)    
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)