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BQ2004E Datasheet(PDF) 1 Page - Texas Instruments |
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BQ2004E 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 bq2004E and bq2004H Fast Charge ICs provide comprehensive fast charge control functions together with high-speed switching power con- trol 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 bq2004E/H-based charg- ers to support battery conditioning and capacity determination. High-efficiency power conversion is accomplished using the bq2004E/H as a hysteretic PWM controller for switch-mode regulation of the charg- ing current. The bq2004E/H may al- ternatively be used to gate an exter- nally 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 rise ( ∆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 with appropriate display mode selections are available. The bq2004H differs from the bq2004E only in that fast charge, hold-off, and top-off time units have been scaled up by a factor of two, and the bq2004H provides different display selections. Timing differ- ences between the two ICs are illus- trated in Table 1. Display differ- ences are shown in Table 2. 1 Fast-Charge ICs bq2004E/H 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 6/99 E Pin Names |
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Similar Description - BQ2004E |
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