BQ24750ARHDR

Product Summary

The BQ24750ARHDR is a high-efficiency, synchronous battery charger with integrated compensation and system power selector logic, offering low component count for space-constrained multi-chemistry battery charging applications. Ratiometric charge current and voltage programming allows high regulation accuracies, and can be either hardwired with resistors or programmed by the system power-management microcontroller using a DAC or GPIOs. The BQ24750ARHDR charges two, three, or four series Li+ cells, supporting up to 10 A of charge current, and is available in a 28-pin, 5x5-mm QFN package. The BQ24750ARHDR 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 Over-Power 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 BQ24750ARHDR 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.

Parametrics

BQ24750ARHDR absolute maximum ratings: (1)Voltage range PVCC, ACP, ACN, SRP, SRN, BAT, BATDRV, ACDRV: -0.3 to 30V; (2)Voltage range PH: -1 to 30V; (3)Voltage range REGN, LODRV, VADJ, ACSET, SRSET, TS, ACDET, ACOP, CHGEN, CELLS, : -0.3 to 7V; (4)Voltage range VDAC: -0.3 to 5.5V; (5)Voltage range VREF, IADAPT : -0.3 to 3.6V; (6)Voltage range BTST, HIDRV with respect to AGND and PGND: -0.3 to 36V; (7)Maximum difference voltage ACP-ACN, SRP-SRN, AGND-PGND: -0.5 to 0.5 V; (8)Junction temperature range: -40 to 155 ℃; (9)Storage temperature range: -55 to 155℃.

Features

BQ24750ARHDR features: (1)NMOS-NMOS Synchronous Buck Converter with 300 kHz Frequency and >95% Efficiency; (2)30-ns Minimum Driver Dead-time and 99.5% Maximum Effective Duty Cycle; (3)High-Accuracy Voltage and Current Regulation; (4)Supports Two, Three, or Four Li+ Cells; (5)5–24 V AC/DC-Adapter Operating Range; (6)Analog Inputs with Ratiometric Programming via Resistors or DAC/GPIO Host Control; (7)Supports Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.; (8)Charge Enable.

Diagrams