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bq24741RHDR Datasheet(PDF) 2 Page - Texas Instruments |
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bq24741RHDR Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 30 page  DESCRIPTION (CONTINUED) VREF RAC 0.010 Q1 (ACFET) SI4435 Q3(BATFET) SI4435 Controlledby HOST P P ACN ACP ACDET EXTPWR ISET ACSET VREF GPIO CELLS CE VDAC VADJ ADC IADAPT HOST PVCC HIDRV SW BTST REGN LODRV PGND SRP SRN P PACK+ PACK- SYSTEM ADAPTER+ ADAPTER- EXTPWR AGND bq24741 432 k 1% 66.5 k 1% R1 R2 R3 C4 C2 C3 C5 C8 Q4_A FDS8978 Q4_B FDS8978 C9 L1 D1 BAT54 C10 BAT TRICKLE FSET R6 97.6 k DPMDET R4 LPMOD VREF LPREF R7 73.2 k 1% R8 26.7 k 1% Q2 (ACFET) SI4435 Controlledby HOST C6 C15 0.1 µF R5 C1 2 R11 2.2 µF 0.1 µF 0.1 µF 1 µF 10 k 10 k 100 pF C14 0.1 µF C13 0.1 µF 0.1 µF 1 µF C11 10 µF 10µH RSR 0.020 0.1 µF 10 µF C7 10 µF C12 10 µF PowerPad D2 BAT54 C13 100 nF 120 k R14 ISET_PWM VREF 102 k 1% R12 64.9 k 1% R13 VREF 60.4 k 1% R9 40.2 k 1% R10 (D=0.72,V =VDAC) peak 10 k 10k R15 bq24741 SLUS875A – MARCH 2009 – REVISED MARCH 2009 ...................................................................................................................................................... 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 bq24741 features resistor-programmable PWM switching frequency and accurate 150mA trickle charge (with 20 m Ω sensing resistor), which can be enabled via the TRICKLE pin. The bq24741 also 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 high-accuracy current sense amplifier enables accurate 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 power performance according to what is available from the adapter. Text for space Text for space Text for space FS = 400 kHz, 90 W Adapter, VADAPTER = 19 V, VBAT = 3-cell Li-Ion (4.2V/cell), Icharge = 3.6 A, Iadapter_limit = 4.0 A Figure 1. Typical System Schematic, Voltage, and Current Programmed by Resistor Text for space Text for space Text for space Text for space Text for space 2 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated Product Folder Link(s) :bq24741 |
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