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BQ2000T Datasheet(PDF) 1 Page - Texas Instruments |
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BQ2000T Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 16 page  1 Features ➤ Safe management of fast charge for NiCd, NiMH, or Li- Ion battery packs ➤ High-frequency switching con- troller for efficient and simple charger design ➤ Pre-charge qualification for detecting shorted, damaged, or overheated cells ➤ Fast-charge termination by ∆T/∆t minimum current (Li-Ion), maximum tempera- ture, and maximum charge time ➤ Selectable top-off mode for achieving maximum capacity in NiMH batteries ➤ Programmable trickle-charge mode for reviving deeply dis- charged batteries and for post- charge maintenance ➤ Built-in battery removal and insertion detection ➤ Sleep mode for low power consumption General Description The bq2000T is a programmable, monolithic IC for fast-charge manage- ment of nickel cadmium (NiCd), nickel metal-hydride (NiMH), or lith- ium-ion (Li-Ion) batteries in single- or multi-chemistry applications. The bq2000T detects the battery chemis- try and proceeds with the optimal charging and termination algorithms. This process eliminates undesirable undercharged or overcharged condi- tions and allows accurate and safe termination of fast charge. Depending on the chemistry, the bq2000T provides a number of charge termination criteria: n Rate of temperature rise, ∆T/∆t (for NiCd and NiMH) n Minimum charging current (for Li-Ion) n Maximum temperature n Maximum charge time For safety, the bq2000T inhibits fast charge until the battery voltage and temperature are within user-defined limits. If the battery voltage is below the low-voltage threshold, the bq2000T uses trickle-charge to condition the battery. For NiMH batteries, the bq2000T provides an optional top-off charge to maximize the battery capacity. The integrated high-frequency com- parator allows the bq2000T to be the basis for a complete, high-efficiency power-conversion circuit for both nickel-based and lithium-based chemistries. bq2000T SNS Current-sense input VSS System ground LED Charge-status output BAT Battery-voltage input 1 PN-2000.eps 8-Pin DIP or Narrow SOIC or TSSOP 2 3 4 8 7 6 5 SNS LED BAT VSS MOD VCC TS RC Pin Connections Pin Names Programmable Multi-Chemistry Fast-Charge Management IC SLUS149A–FEBRUARY 2000 TS Temperature-sense input RC Timer-program input VCC Supply-voltage input MOD Modulation-control output |
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