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BQ2004 Datasheet(PDF) 1 Page - Texas Instruments |
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BQ2004 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 16 page  Features ➤ Fast charge and conditioning of nickel cadmium or nickel-metal hydride batteries ➤ Hysteretic PWM switch-mode current regulation or gated con- trol of an external regulator ➤ Easily integrated into systems or used as a stand-alone charger ➤ Pre-charge qualification of tem- perature and voltage ➤ Configurable, direct LED outputs display battery and charge status ➤ Fast-charge termination by ∆ tem- perature/ ∆ time, peak volume de- tection, - ∆V, maximum voltage, maximum temperature, and maxi- mum time ➤ Optional top-off charge and pulsed current maintenance charging ➤ Logic-level controlled low-power mode (< 5 µA standby current) General Description 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 so- lution 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 charg- ing current. The bq2004 may alterna- tively 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 tempera- ture and voltage are within config- ured limits. Temperature, voltage, and time are monitored throughout fast charge. Fast charge is terminated by any of the following: n Rate of temperature time ( ∆T/∆t) n Peak voltage detection (PVD) n Negative delta voltage (- ∆V) n Maximum voltage n Maximum temperature n Maximum time After fast charge, optional top-off and pulsed current maintenance phases are available. 1 Fast-Charge IC bq2004 DCMD Discharge command DSEL Display select VSEL Voltage termination select TM1 Timer mode select 1 TM2 Timer mode select 2 TCO Temperature cutoff TS Temperature sense BAT Battery voltage 1 PN2004E01.eps 16-Pin Narrow DIP or Narrow SOIC 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 INH DIS MOD VCC VSS LED2 LED1 SNS DCMD DSEL VSEL TM1 TM2 TCO TS BAT SNS Sense resistor input LED1 Charge status output 1 LED2 Charge status output 2 VSS System ground VCC 5.0V ±10% power MOD Charge current control DIS Discharge control output INH Charge inhibit input Pin Connections SLUS063–JUNE 1999 F Pin Names |
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