BQ25122 700-nA Low IQ Highly Integrated Battery Charge Management Solution | TI.com

BQ25122
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700-nA Low IQ Highly Integrated Battery Charge Management Solution

 

Description

The bq25122 is a highly integrated battery charge management IC that integrates the most common functions for wearable devices: Linear charger, regulated output, load switch, manual reset with timer, and battery voltage monitor. The integrated buck converter is a high efficiency, low IQ switcher using DCS control that extends light load efficiency down to 10-µA load currents. The low quiescent current during operation and shutdown enables maximum battery life. The device supports charge currents from 5 mA to 300 mA. The input current limit, charge current, buck converter output voltage, LDO output voltage, and other parameters are programmable through the I2C interface.

The battery is charged using a standard Li-Ion charge profile with three phases: precharge, constant current and constant voltage. A voltage-based JEITA compatible battery pack thermistor monitoring input (TS) is included that monitors battery temperature and automatically changes charge parameters to prevent the battery from charging outside of its safe temperature range. The charger is optimized for 5-V USB input, with 20-V tolerance to withstand line transients. The buck converter is run from the input or battery. When in battery only mode, the device can run from a battery up to 4.65 V.

A configurable load switch allows system optimization by disconnecting infrequently used devices. The manual reset with timer allows multiple different configuration options for wake are reset optimization.

Features

  • Increases System Operation Time Between Charges
    • Configurable 300-mA Buck Regulator
      (1.2-V Default)
    • 700 nA (typical) Iq with Buck Converter Enabled (No Load)
    • Configurable Load Switch or 100mA LDO Output (Load Switch enabled by default)
    • Up to 300-mA Charge Current for Fast Charging
    • 0.5% Accurate Battery Voltage Regulation (Configurable from 3.6 V to 4.65 V in 10-mV Steps)
    • Configurable Termination Current Down to
      500 µA
    • Simple Voltage Based Battery Monitor
  • Highly Integrated Solution with Small Footprint
    • 2.5 mm x 2.5 mm WCSP Package and 6 External Components for Minimal Solution
    • Push-Button Wake-Up and Reset with Adjustable Timers
    • Power Path Management for Powering the System and Charging the Battery
    • Power Path Management enables < 50 nA 150 nA Ship Mode Battery Quiescent Current for Longest Shelf Life
    • Battery Charger Operates from 3.4 V – 5.5 VIN (5.5-V OVP / 20-V Tolerant)
    • Dedicated Pins for Input Current Limit, Charge Current, Termination Current, and Status Output
  • I2C Communication Control
    • Charge Voltage and Current
    • Termination Threshold
    • Input Current Limit
    • VINDPM Threshold
    • Timer Options
    • Load Switch Control
    • Controls for Interrupts for Faults and Status
    • System Output Voltage Adjustment
    • LDO Output Voltage Adjustment

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Parametrics

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Part number Order Number of series cells Function Cell chemistry Charge current (Max) (A) Operating Vin (Min) (V) Operating Vin (Max) (V) Absolute Vin (safety rating) (Max) ((V)) Battery charge voltage (Min) (V) Battery charge voltage (Max) (V) Features Control interface Control topology Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
BQ25122 Order now 1     Charger     Li-Ion/Li-Polymer     0.3     3.4     5.5     20     3.6     4.65     Integrated Buck Converter
Integrated LDO
JEITA BAT Temp Monitoring (Thermistor Pin)
OVP
Power Path
Temp Monitoring (Thermistor Pin)
Thermal Regulation
UVLO    
I2C     Linear     Catalog     -40 to 85     DSBGA | 25     See datasheet (DSBGA)    
BQ25120A Order now 1     Charger     Li-Ion/Li-Polymer     0.3     3.4     5.5     20     3.6     4.65     Integrated Buck Converter
Integrated LDO
JEITA BAT Temp Monitoring (Thermistor Pin)
OVP
Power Path
Temp Monitoring (Thermistor Pin)
Thermal Regulation
UVLO    
I2C     Linear     Catalog     -40 to 85     DSBGA | 25     See datasheet (DSBGA)    
BQ25121A Order now 1     Charger     Li-Ion/Li-Polymer     0.3     3.4     5.5     20     3.6     4.65     Integrated Buck Converter
Integrated LDO
JEITA BAT Temp Monitoring (Thermistor Pin)
OVP
Power Path
Temp Monitoring (Thermistor Pin)
Thermal Regulation
UVLO    
I2C     Linear     Catalog     -40 to 85     DSBGA | 25     See datasheet (DSBGA)    
BQ25125 Order now 1     Charger     Li-Ion/Li-Polymer     0.3     3.4     5.5     20     3.6     4.65     Integrated Buck Converter
Integrated LDO
JEITA BAT Temp Monitoring (Thermistor Pin)
OVP
Power Path
Temp Monitoring (Thermistor Pin)
Thermal Regulation
UVLO    
I2C     Linear     Catalog     -40 to 85     DSBGA | 25     See datasheet (DSBGA)    
BQ25150 Order now 1     Charger     Li-Ion/Li-Polymer     0.5     3.4     5.5     20     3.6     4.6     Integrated LDO
Power Path
JEITA BAT Temp Monitoring (Thermistor Pin)
Temp Monitoring (Thermistor Pin)
Integrated ADC
Thermal Regulation    
I2C     Linear     Catalog     -40 to 85     DSBGA | 20     20DSBGA: 4 mm2: 2.2 x 1.8 (DSBGA | 20)