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 interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile) Operating Vin (Min) (V) 4.5 Rating Catalog
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 interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile) Operating Vin (Min) (V) 4.5 Rating Catalog
PDIP (N) 16 181 mm² 19.3 x 9.4 SOIC (DW) 16 77 mm² 7.52 x 10.28
  • 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
  • Direct LED outputs display battery and charge status
  • Fast-charge termination by V, maximum voltage, maximum temperature, and maximum time
  • Optional top-off charge
  • 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
  • Direct LED outputs display battery and charge status
  • Fast-charge termination by V, maximum voltage, maximum temperature, and maximum time
  • Optional top-off charge

The bq2003 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 bq2003 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 bq2003-based chargers to support battery conditioning and capacity determination.

High-efficiency power conversion is accomplished using the bq2003 as a hysteretic PWM controller for switch-mode regulation of the charging current. The bq2003 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 rise (t)
  • Negative delta voltage (-V)
  • Maximum voltage
  • Maximum temperature
  • Maximum time

After fast charge, an optional top-off phase is available. Constant-current maintenence charge is provided by an external trickle resistor.

The bq2003 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 bq2003 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 bq2003-based chargers to support battery conditioning and capacity determination.

High-efficiency power conversion is accomplished using the bq2003 as a hysteretic PWM controller for switch-mode regulation of the charging current. The bq2003 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 rise (t)
  • Negative delta voltage (-V)
  • Maximum voltage
  • Maximum temperature
  • Maximum time

After fast charge, an optional top-off phase is available. Constant-current maintenence charge is provided by an external trickle resistor.

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Technical documentation

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Type Title Date
* Data sheet Fast-Charge IC datasheet (Rev. A) 21 Feb 2000
Technical article When to use rechargeable batteries in small battery applications 01 Oct 2019
Technical article Should I use a linear charger or a switching charger? 31 Oct 2015
Technical article Summertime and the livin' is easy 20 Jun 2014
User guide DV2003L1 Fast Charge Development System Control of On-Board Linear Current 05 Sep 1999
User guide DV2003S1 Fast Charge Development System User's Guide 05 Sep 1999
User guide DV2003S2 Fast Charge Development System Control of On-Board n-FET Switch-Mode 05 Sep 1999

Design & development

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

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