BQ24705RGET Datasheet PDF - TI

●DESCRIPTION

●The bq24705 is a high-efficiency, synchronous battery charger with integrated compensation, offering low component count for space-limited multi-chemistry battery charging applications. 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.

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●FEATURES

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●NMOS-NMOS Synchronous Buck Converter

●with 600 kHz Frequency and >95% Efficiency

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●30-ns Minimum Driver Dead-time and 99.5%

●Maximum Effective Duty Cycle

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●High-Accuracy Voltage and Current Regulation

●– ±0.5% Charge Voltage Accuracy

●– ±3% Charge Current Accuracy

●– ±3% Adapter Current Accuracy

●– ±2% Input Current Sense Amp Accuracy

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●Integration

●– Internal Loop Compensation

●– Internal Soft-Start

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●Safety

●– Input Overvoltage Protection (OVP)

●– Dynamic Power Management (DPM) with

●Status Indicator

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●Supports Two, Three, or Four Li+ Cells

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●5 – 24 V AC/DC-Adapter Operating Range

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●Analog Inputs with Ratiometric Programming

●via Resistors or DAC/GPIO Host Control

●– Charge Voltage (4-4.512 V/cell)

●– Charge Current (up to 8 A, with 10-m

●Ω

●Sense Resistor)

●– Adapter Current Limit (DPM)

●APPLICATIONS

●• Notebook and Ultra-Mobile Computers

●• Portable Data-Capture Terminals

●• Portable Printers

●• Medical Diagnostics Equipment

●• Battery Bay Chargers

●• Battery Back-Up Systems