Product details


Number of series cells 1, 2, 3, 4 Charge current (Max) (A) 2 Operating Vin (Max) (V) 5.5 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (Min) (V) 0 Battery charge voltage (Max) (V) 20 Absolute Vin (safety rating) (Max) ((V)) 7 Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (JEITA profile) Operating Vin (Min) (V) 4.5 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

PDIP (N) 16 181 mm² 19.3 x 9.4 SOIC (D) 16 59 mm² 9.9 x 6 open-in-new Find other Battery charger ICs


  • Safe charge of Li-Ion battery packs
  • Pulse-width modulation control for current and voltage regulation
  • Programmable high-side/low-side current-sense
  • Fast charge terminated by selectable minimum current; safety backup termination at maximum time
  • Precharge qualification detects shorted or damaged cells and conditions battery
  • Charging continuously qualified by temperature and voltage limits
  • Direct LED control outputs to display charge status and fault conditions
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The bq2954 Li-Ion Charge-Management IC uses a flexible pulse-width modulation regulator to control voltage and current during charging. The regulator frequency is set by an external capacitor for design flexibility. The switch-mode design minimizes power dissipation.

For safety, the bq2954 inhibits fast charging until the battery voltage and temperature are within configured limits. If the battery voltage is less than the low-voltage threshold, the bq2954 provides low-current conditioning of the battery.

For charge qualification, the bq2954 uses an external thermistor to measure battery temperature. Charging begins when power is applied or the battery is inserted

The bq2954 charges a battery in two phases. First a constant-current phase replenishes approximately 70% of battery capacity. Then a voltage- regulation phase completes the battery charge.

The bq2954 provides status indications of all charger states and faults for accurate determination of the battery and charge-system conditions.

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Technical documentation

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Type Title Date
* Data sheet Lithium Ion Charge Management IC with Integrated Switching Controller datasheet Sep. 05, 1999
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

Design & development

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PDIP (N) 16 View options
SOIC (D) 16 View options

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