Product details


Number of series cells 1, 2, 3, 4 Charge current (Max) (A) 2 Operating Vin (Max) (V) 5.5 Cell chemistry NiCd, NiMH Battery charge voltage (Min) (V) 0 Battery charge voltage (Max) (V) 5.5 Absolute Vin (safety rating) (Max) ((V)) 7 Control topology Switch-Mode Buck Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold 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


  • Fast charge and conditioning of nickel cadmium or nickel-metal hydride batteries
  • Hysteretic PWM switch-mode current regulation or gated control of an external regulator
  • Easily integrated into systems or used as a stand-alone charger
  • Pre-charge qualification of temperature and voltage
  • Configurable, direct LED outputs display battery and charge status
  • Fast-charge termination by V, maximum voltage, maximum temperature, and maximum time
  • Optional top-off charge and pulsed current maintenance charging
  • Logic-level controlled low-power mode (< 5µA standby current)

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The bq2004 Fast Charge IC provides comprehensive fast charge control functions together with high-speed switching power control circuitry on a monolithic CMOS device.

Integration of closed-loop current control circuitry allows the bq2004 to be the basis of a cost-effective solution for stand-alone and system integrated chargers for batteries of one or more cells.

Switch-activated discharge-before charge allows bq2004-based chargers to support battery conditioning and capacity determination.

High-efficiency power conversion is accomplished using the bq2004 as a hysteretic PWM controller for switch-mode regulation of the charging current. The bq2004 may alternatively be used to gate an externally regulated charging current.

Fast charge may begin on application of the charging supply, replacement of the battery, or switch depression. For safety, fast charge is inhibited unless/until the battery temperature and voltage are within configured limits.

Temperature, voltage, and time are monitored throughout fast charge. Fast charge is terminated by any of the following:

  • Rate of temperature time (t)
  • Peak voltage detection (PVD)
  • Negative delta voltage (-V)
  • Maximum voltage
  • Maximum temperature
  • Maximum time

After fast charge, optional top-off and pulsed current maintenance phases are available.

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Technical documentation

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Type Title Date
* Data sheet Fast-Charge IC datasheet (Rev. B) Apr. 19, 2005
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 DV2004S1/ES1/HS1 Fast Charge Dev System Control of On-Board P-FET S-M Reg (Rev. A) Aug. 30, 2002
User guide DV2004L1 Fast Charge Development System Control of PNP Power Transistor Sep. 05, 1999
Application note High-Side Current Sensing with Benchmarq's Fast-Charge Control ICs Sep. 05, 1999
Application note Using NiMH and Li-Ion Batteries in Portable Applications Sep. 05, 1999

Design & development

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

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