BQ24705RGETG4

Battery Charger Lead-Acid/Li-Ion/NiCD/NiMH 8000mA 8V to 18V 24Pin VQFN EP T/R

**DESCRIPON**

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.

**1****FEATURES**

**2**• **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