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BQ24725ARGRR Datasheet(PDF) 36 Page - Texas Instruments |
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BQ24725ARGRR Datasheet(HTML) 36 Page - Texas Instruments |
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36 / 47 page  VCC BATDRV REGN BTST HIDRV PHASE LODRV GND SRP SRN Q4 Sis412DN L1 4.7µH SYSTEM C10 10 µF RSR 10 mW R1 430 kW R2 487 kW C2 0.1µF U1 bq24725A C8 10uF Q3 Sis412DN C7 0.047µF Adapter + RAC 10 mW Pack + C6 1µF HOST Dig I/O SMBus +3.3V C4 100 pF R4 R5 R7 549 k W ACN ACP CMSRC ACDRV ACDET ILIM SDA SCL ACOK IOUT Din BAT54A R9 4.7 W R3 10 kW R8 100 kW R10 4.02 kW R11 4.02 kW D1 BAT54 C9 10uF C11 10 µF Pack - C3 0.1µF C5 1µF R6 4.02 kW C1 0.1 µF Total Csys 220 µF Adapter - ADC Q1 (ACFET) FDS6680A Q2 (RBFET) FDS6680A PowerPad C13 0.1µF C14 0.1µF R14 10 W R15 7.5 W * * C17 2200pF C16 0.047µF R12 100 kW Q5 (BATFET) Si4435DDY D2 SL42 10 kW 10 kW * * bq24725A SLUSAL0A – SEPTEMBER 2011 – REVISED AUGUST 2014 www.ti.com System Examples (continued) Fs = 750kHz, IADPT = 2.048A, ICHRG = 1.984A, ILIM = 2.54A, VCHRG = 4.200V, 12W adapter and 1S2P battery pack Use 0 Ω for better current sensing accuracy, use 10Ω/7.5Ω resistor for reversely battery connection protection. See application information about negative output voltage protection for hard shorts on battery to ground or battery reversely connection. The total Csys is the total lump sum of system capacitance. It is not required by charger IC. Use Din for reverse input voltage protection. See application information about reverse input voltage protection. Figure 26. Typical System Schematic for 5V Input 1S Battery 10 Power Supply Recommendations When adapter is attached, and ACOK goes HIGH, the system is connected to adapter through ACFET/RBFET. An external resistor voltage divider attenuates the adapter voltage before it goes to ACDET. The adapter detect threshold should typically be programmed to a value greater than the maximum battery voltage, but lower than the IC maximum allowed input voltage and system maximum allowed voltage. When adapter is removed, the system is connected to battery through BATFET. Typically the battery depletion threshold should be greater than the minimum system voltage so that the battery capacity can be fully utilized for maximum battery life. 36 Submit Documentation Feedback Copyright © 2011–2014, Texas Instruments Incorporated Product Folder Links: bq24725A |
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