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BQ24745 Datasheet(PDF) 2 Page - Texas Instruments |
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BQ24745 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 39 page (1) Pullup rail could be either VREF or other system rail. RAC 0.010 RSR 0.010 Q1 (ACFET) SI4835BDY P P CSSN CSSP ACIN VREF CE SDA SCL SMBus VICM HOST (EC) UGATE PHASE BOOT VDDP LGATE PGND CSOP CSON PACK+ PACK- CHRG_IN ADAPTER + ADAPTER - GND bq24745 309k 1% 49.9k 1% R1 R2 1uF C4 C2 0.1u C3 0.1u 100pF C5 C6 1u Q3 FDS6680A Q4 FDS6680A 0.1uF C7 L1 5.6uH D1 BAT54 C8 1u C9 0.1uF C10 0.1uF C13 2x10u C15 10uF VFB ICOUT ICREF Q2 (RBFET) SI4835BDY Controlled by HOST C14 10uF C17 0.1uF R10 10k R11 10k EAI FBO NC NC EAO 27 28 2 12 3 26 7 9 10 8 14 16 4 5 6 1 15 17 18 19 20 25 21 23 24 DCIN VDDSMB 11 ACOK 10k R3 13 DISCRETE LOGIC RC6 10 Dig I/O +3.3V_ALWAYS OR +5V_ALWAYS R12 10k 22 100 R22 C1 2.2u RC1 2.2 DISCRETE LOGIC R20 20k R21 200k R19 7.5k C21 2000pF C22 130pF C23 51pF bq24745 SLUS761D – DECEMBER 2007 – REVISED OCTOBER 2011 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. DESCRIPTION (CONTINUED) The bq24745 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 adaptor 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, allowing monitoring the overall system power. If the adapter current is above the programmed low-power threshold, a signal is sent to host so that the system optimizes its performance to the power available from the adapter. An integrated comparator monitors the input current through the current-sense amplifier, and indicates when the input current exceeds a programmable threshold limit. TYPICAL APPLICATIONS VIN = 20 V, VBAT = 4-cell Li-Ion, ICHARGE = 4.5 A Figure 1. Typical System Schematic Using External Input-Current Comparator (Discrete Logic) Instead of Internal Comparator 2 Submit Documentation Feedback Copyright © 2007–2011, Texas Instruments Incorporated Product Folder Link(s) :bq24745 |
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