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BQ2003S Datasheet(PDF) 1 Page - Texas Instruments |
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BQ2003S Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 15 page  1 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 ➤ Direct LED outputs display battery and charge status ➤ Fast-charge termination by ∆ temperature/∆ time, -∆V, maxi- mum voltage, maximum tem- perature, and maximum time ➤ Optional top-off charge General Description 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 so- lution 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 charg- ing current. The bq2003 may alterna- tively be used to gate an externally regulated charging current. Fast charge may begin on applica- tion of the charging supply, replace- ment of the battery, or switch de- pression. 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: n Rate of temperature rise ( ∆T/∆t) n Negative delta voltage (- ∆V) n Maximum voltage n Maximum temperature n Maximum time After fast charge, an optional top-off phase is available. Constant-cur- rent maintenence charge is provided by an external trickle resistor. Fast-Charge IC bq2003 CCMD Charge command/select DCMD Discharge command DVEN - ∆V enable/disable TM 1 Timer mode select 1 TM 2 Timer mode select 2 TS Temperature sense BAT Battery voltage VSS System ground 1 PN200301.eps 16-Pin DIP or SOIC 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC DIS MOD CHG TEMP MCV TCO SNS CCMD DCMD DVEN TM1 TM2 TS BAT VSS SNS Sense resistor input TCO Temperature cutoff MCV Maximum voltage TEMP Temperature status output CHG Charging status output MOD Charge current control DIS Discharge control VCC 5.0V ±10% power Pin Connections Pin Names SLUS095A - OCTOBER 1999 I |
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