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BQ24705 Datasheet(PDF) 20 Page - Texas Instruments |
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BQ24705 Datasheet(HTML) 20 Page - Texas Instruments |
20 / 32 page BATTERY OVERVOLTAGE PROTECTION CHARGE OVERCURRENT PROTECTION THERMAL SHUTDOWN PROTECTION Status Outputs (ACGOOD, DPMDET) bq24705 SLUS779B – DECEMBER 2007 – REVISED MARCH 2009............................................................................................................................................... www.ti.com The converter stops switching when BAT voltage goes above 104% of the regulation voltage. The converter will not allow the high-side FET to turn on until the BAT voltage goes below 102% of the regulation voltage. This allows one-cycle response to an overvoltage condition, such as when the load is removed or the battery is disconnected. A 10-mA current sink from BAT to PGND is on only during charge, and allows discharging the stored output-inductor energy into the output capacitors. The charger has a secondary overcurrent protection. It monitors the charge current, and prevents the current from exceeding 145% of regulated charge current. The high-side gate drive turns off when the overcurrent is detected, and automatically resumes when the current falls below the overcurrent threshold. The QFN package has low thermal impedance, which provides good thermal conduction from the silicon to the ambient, to keep junctions temperatures low. As added level of protection, the charger converter turns off and self-protects whenever the junction temperature exceeds the TSHUT threshold of 155°C. The charger stays off until the junction temperature falls below 135°C. Two status outputs are available, and they require external pull up resistors to pull the pins to system digital rail for a high level. ACGOOD open-drain output goes low if ACDET is above 2.4 V. DPMDET open-drain output goes low when the DPM loop is active to reduce the battery charge current (after a 10-ms delay). 20 Submit Documentation Feedback Copyright © 2007–2009, Texas Instruments Incorporated Product Folder Link(s) :bq24705 Not Recommended for New Designs |
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