Product details


Number of series cells 1 Charge current (Max) (A) 0.5 Operating Vin (Max) (V) 13.5 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (Min) (V) 4.1 Battery charge voltage (Max) (V) 4.1 Absolute Vin (safety rating) (Max) ((V)) 16.5 Control topology Linear Control interface Standalone (RC-Settable) Operating Vin (Min) (V) 2.8 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

HVSSOP (DGN) 8 9 mm² 3 x 3 open-in-new Find other Battery charger ICs


  • Designed Specifically to Work With Current-Limited Wall Supplies
  • Ideal for Low Dropout Charger Design for Single-Cell Li-Ion Packs With Coke or Graphite Anodes
  • Integrated PowerFET for 500 mA
  • Integrated Voltage Regulation With 0.5% Accuracy
  • Battery Insertion and Removal Detection
  • Charge Termination by Minimum Current and Time
  • Pre-Charge Conditioning With Safety Timer
  • Sleep Mode for Low-Power Consumption
  • Charge Status Output for LED or Host Processor Interface Indicates
  • Charge-in-Progress, Charge Completion, and Fault Conditions
  • Optional Temperature Monitoring Before and During Charge
  • Small, 8-Pin Power-Pad MSOP Package

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The bq2420x series are simple Li-Ion linear charge management devices targeted at low-cost and space limited charger applications. The bq2420x series offer integrated powerFET, high-accuracy voltage regulation, temperature monitoring, charge status, and charge termination, in a single monolithic device.

The bq2420x is designed to work with a current-limited wall-mount transformer and therefore does not provide any current regulation. However, these devices offer a fixed internal current limit to prevent damage to the internal powerFET. A time-limited pre-conditioning phase is provided to condition deeply discharged cells. Once the battery reaches the charge voltage, the high accuracy voltage regulation loop takes over and completes the charge cycle. Charge is terminated based on minimum current. An internal charge timer provides a backup safety for charge termination.

Other standard features include an automatic sleep mode activated when VCC falls below the battery voltage falls below the VRCH threshold.

In addition to the standard features, the core product provides two additional enhancements: temperature monitoring and status display. The temperaturesense circuit continuously measures battery temperature using an external thermistor and inhibits charge until the battery temperature is within the user-defined thresholds. The STAT pin indicates three conditions of operation of the charger. These conditions are charge-in-progress, charge complete, and fault. This output can be used to drive an LED or an interface to a microcontroller.

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Technical documentation

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Type Title Date
* Data sheet Single-Chip Li-Ion & Li_Pol Charge Mgmt IC for Current-Limited Application datasheet (Rev. C) Mar. 19, 2008
Technical article When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical article Should I use a linear charger or a switching charger? Oct. 31, 2015
Technical article Summertime and the livin' is easy Jun. 20, 2014
User guide bq2420x Single-Chip Li-Ion/Li-Pol Charge Management IC for Current-Limited Appli Dec. 10, 2001

Design & development

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Software development

Temp Sense Designer Software
TEMPSENSE-SW The TempSense Designer software allows the user to easily design temperature sensing circuits for many of the Texas Instruments battery charger devices. A full listing of the supported devices is included under the "Support" menu in the program. The user can use the thermisters included in the (...)

The program gives the user:

  • Worse-case limits of the resistance
  • Trip voltages
  • Temperatures of the design

CAD/CAE symbols

Package Pins Download
HVSSOP (DGN) 8 View options

Ordering & quality

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