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BQ24753RHDT Datasheet(PDF) 2 Page - Texas Instruments |
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BQ24753RHDT Datasheet(HTML) 2 Page - Texas Instruments |
2 / 38 page DESCRIPTION (CONTINUED) VREF RAC 0.010 Ω RSR 0.010 Ω Q2 (ACFET) SI4435 Q3(BATFET) SI4435 P P ACN ACP ACDET SRSET ACSET VREF CELLS VDAC VADJ ADC IADAPT HOST PVCC HIDRV PH BTST REGN LODRV PGND SRP SRN P PACK+ PACK- SYSTEM ADAPTER + ADAPTER - /ACGOOD AGND bq24753 2.2 µF C1 432 kΩ 1% 66.5 kΩ 1% R1 R2 10 kΩ R5 1 µF C4 100 pF C5 0.1 µF C8 Q4 FDS6680A Q5 FDS6680A 0.1 µF C9 L1 8.2 µH D1 BAT54 1 µF C10 BAT OVPSET 422 kΩ 1% R3 71 kΩ 1% R4 LEARN ACOP Q1 (ACFET) SI4435 10 µF C6 C15 0.1 µF C16 0.47 µF 0.1 µF C2 C3 2 Ω R10 0.1 µF PowerPad 10 µF C7 10 µF C12 C14 0.1 µF C13 0.1 µF C11 10 µF GPIO DAC DAC CHGEN ACGOOD ACDRV BATDRV bq24753 SLUS885A – DECEMBER 2008 – REVISED DECEMBER 2008........................................................................................................................................ www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. The bq24753 controls external switches to prevent battery discharge back to the input, connect the adapter to the system, and to connect the battery to the system using 6-V gate drives for better system efficiency. For maximum system safety, inrush-power limiting provides instantaneous response to high input voltage multiplied by current. This AC Overpower protection (ACOP) feature limits the input-switch power to the programmed level on the ACOP pin, and latches off if the high-power condition persists to prevent overheating. The bq24753 features Dynamic Power Management (DPM) and input power limiting. These features reduce battery charge current when the input power limit is reached to avoid overloading the AC adapter when supplying the load and the battery charger simultaneously. A highly-accurate current-sense amplifier enables precise measurement of input current from the AC adapter to monitor the overall system power. (1) Pull-up rail could be either VREF or other system rail. (2) SRSET/ACSET could come from either DAC or resistor dividers. VIN = 20 V, VBAT = 3-cell Li-Ion, Icharge = 3 A, Iadapter_limit = 3.5 A Figure 1. Typical System Schematic, Voltage and Current Programmed by DAC 2 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s) :bq24753 |
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