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BQ2002E Datasheet(PDF) 1 Page - Texas Instruments |
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BQ2002E Datasheet(HTML) 1 Page - Texas Instruments |
1 / 13 page Features ® Fast charge of nickel cadmium or nickel-metal hydride batter- ies ® Direct LED output displays charge status ® Fast-charge termination by - ∆V, maximum voltage, maximum temperature, and maximum time ® Internal band-gap voltage ref- erence ® Optional top-off charge ® Selectable pulse trickle charge rates ® Low-power mode ® 8-pin 300-mil DIP or 150-mil SOIC General Description The bq2002E and bq2002G Fast- Charge ICs are low-cost CMOS bat- tery-charge controllers providing reli- able charge termination for both NiCd and NiMH battery applications. Con- trolling a current-limited or con- stant-current supply allows the bq2002E/G to be the basis for a cost- effective stand-alone or system-inte- grated charger. The bq2002E/G inte- grates fast charge with optional top-off and pulsed- trickle control in a single IC for charging one or more NiCd or NiMH battery cells. Fast charge is initiated on application of the charging supply or battery re- placement. For safety, fast charge is inhibited if the battery temperature and voltage are outside configured limits. Fast charge is terminated by any of the following: n Peak voltage detection (PVD) n Negative delta voltage (- ∆V) n Maximum voltage n Maximum temperature n Maximum time After fast charge, the bq2002E/G op- tionally tops-off and pulse-trickles the battery per the pre-configured limits. Fast charge may be inhibited using the INH pin. The bq2002E/G may also be placed in low-standby-power mode to reduce system power con- sumption. The bq2002E differs from the bq2002G only in that a slightly dif- ferent set of fast-charge and top-off time limits is available. All differ- ences between the two ICs are illus- trated in Table 1. 1 NiCd/NiMH Fast-Charge Management ICs bq2002E/G TM Timer mode select input LED Charging status output BAT Battery voltage input VSS System ground 1 PN-200201.eps 8-Pin DIP or Narrow SOIC 2 3 4 8 7 6 5 TM LED BAT VSS CC INH VCC TS TS Temperature sense input VCC Supply voltage input INH Charge inhibit input CC Charge control output Pin Connections Pin Names 2/99 bq2002E/G Selection Guide Part No. LBAT TCO HTF LTF - ∆V PVD Fast Charge tMTO Top-Off Maintenance bq2002E 0.175 ∗ VCC 0.5 ∗ VCC 0.6 ∗ VCC None C/2 200 None C/32 1C 80 C/16 C/32 2C 40 None C/32 bq2002G 0.175 ∗ VCC 0.5 ∗ VCC 0.6 ∗ VCC None C/2 160 None C/32 1C 80 C/16 C/32 2C 40 None C/32 |
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