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BQ2054SNG4 Datasheet(PDF) 3 Page - Texas Instruments |
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BQ2054SNG4 Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 19 page  Charge Algorithm The bq2054 uses a two-phase fast charge algorithm. In phase 1, the bq2054 regulates constant current (ISNS = IMAX) until VCELL (= VBAT -VSNS) rises to VREG. The bq2054 then transitions to phase 2 and regulates con- stant voltage (VCELL =VREG) until the charging current falls below the programmed IMIN threshold. The charg- ing current must remain below IMIN for 120 ± 40ms bef- ore a valid fast charge termination is detected. Fast charge then terminates, and the bq2054 enters the Charge Complete state. See Figures 1 and 2. Charge Qualification The bq2054 starts a charge cycle when power is applied while a battery is present or when a battery is inserted. Figure 2 shows the state diagram for pre-charge qualifi- cation and temperature monitoring. The bq2054 first checks that the battery temperature is within the al- lowed, user-configurable range. If the temperature is out of range, the bq2054 enters the Charge Pending state and waits until the battery temperature is within the al- lowed range. Charge Pending is enunciated by LED3 flashing. Thermal monitoring continues throughout the charge cycle, and the bq2054 enters the Charge Pending state when the temperature out of range. (There is one excep- tion; if the bq2054 is in the Fault state—see below—the out-of-range temperature is not recognized until the bq2054 leaves the Fault state.) All timers are sus- pended (but not reset) while the bq2054 is in Charge Pending. When the temperature comes back into range, the bq2054 returns to the point in the charge cycle where the out-of-range temperature was detected. When the temperature is valid, the bq2054 then regu- lates current to ICOND (=IMAX/5). After an initial holdoff period tHO (which prevents the chip from reacting to transient voltage spikes that may occur when charge current is first applied), the chip begins monitoring VCELL.If VCELL does not rise to at least VMIN before the expiration of time-out limit tMTO (e.g. the cell has failed short), the bq2054 enters the Fault state. If VMIN is achieved before expiration of the time limit, the chip be- gins fast charging. Once in the Fault state, the bq2054 waits until VCC is cycled or a new battery insertion is detected. It then starts a new charge cycle and begins the qualification process again. 3 bq2054 GR205401.eps IMAX IMIN ICOND VMIN VREG Time Phase 1 Phase 2 Fast Charge Voltage Current Figure 1. bq2054 Charge Algorithm |
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