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BQ2057TTSTR Datasheet(PDF) 11 Page - Texas Instruments |
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BQ2057TTSTR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 24 page bq2057, bq2057C bq2057T, bq2057W SLUS025F − MAY 2001 − REVISED JULY 2002 11 www.ti.com APPLICATION INFORMATION Figure 5. High-Side Current Sensing Figure 6. Low-Side Current Sensing SNS BAT VCC TS COMP CC VSS STAT bq2057 DC+ DC− RSNS BAT+ BAT− SNS BAT VCC TS COMP CC VSS STAT bq2057 DC+ DC− RSNS BAT+ BAT− voltage regulation phase The voltage regulation feedback is through the BAT pin. This input is tied directly to the positive side of the battery pack. The bq2057 monitors the battery-pack voltage between the BAT and VSS pins. The bq2057 is offered in four fixed-voltage versions: 4.1 V, 4.2 V, 8.2 V and 8.4 V. Other regulation voltages can be achieved by adding a voltage divider between the positive and negative terminals of the battery pack and using bq2057T or bq2057W. The voltage divider presents scaled battery-pack voltage to BAT input. (See Figure 7 and Figure 8.) The resistor values RB1 and RB2 for the voltage divider are calculated by the following equation: R B1 R B2 + N V (CELL) V O(REG) –1 Where: N = Number of cells in series V(CELL) = Desired regulation voltage per cell (2) |
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