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BQ2002FPNE4 Datasheet(PDF) 4 Page - Texas Instruments |
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BQ2002FPNE4 Datasheet(HTML) 4 Page - Texas Instruments |
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4 / 17 page  Starting A Charge Cycle Either of two events starts a charge cycle (see Figure 4): 1. Application of power to VCC or 2. Voltage at the BAT pin falling through the maximum cell voltage VMCV where VMCV = 2V ±5%. If the battery is within the configured temperature and voltage limits, the IC begins fast charge. The valid bat- tery voltage range is VBAT <VMCV. The valid tempera- ture range is VTS >VTCO where VTCO = 0.5 ∗ VCC ±5%. If the battery voltage or temperature is outside of these limits, the IC pulse-trickle charges until the next new charge cycle begins. Fast charge continues until termination by one or more of the five possible termination conditions: n Peak voltage detection (PVD) n Negative delta voltage (- ∆V) n Maximum voltage n Maximum temperature n Maximum time 4 bq2002/F Corresponding Fast-Charge Rate TM Termination Typical Fast-Charge and Top-Off Time Limits (minutes) Typical PVD and - ∆V Hold-Off Time (seconds) Top-Off Rate Pulse- Trickle Rate Pulse- Trickle Period (ms) bq2002 bq2002F C/2 Mid PVD 160 160 600 C/32 C/64 9.15 1C Low PVD 80 100 300 C/16 C/64 18.3 2C High - ∆V 40 40 150 Disabled C/32 18.3 Notes: Typical conditions = 25°C, VCC = 5.0V. Mid = 0.5 * VCC ±5V Tolerance on all timing is ±20%. Table 1. Fast-Charge Safety Time/Hold-Off Table TD2002F1.eps Fast Charging VCC = 0 Fast Charging CC Output LED s s Charge initiated by application of power Charge initiated by battery replacement Pulse-Trickle Top-Off (optional) 286 See Table 1 s 286 4576 Figure 4. Charge Cycle Phases |
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