BQ24741RHDT

锂离子或锂聚合物电池充电器具有低Iq和准确的涓流充电 Li-Ion or Li-Polymer Battery Charger with Low Iq and Accurate Trickle Charge

DESCRIPON

The bq24741/2 is a high-efficiency, synchronous battery charger with integrated compensation, offering low component count for space-constrained Li-ion or Li-polymer 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 bq24741/2 charges two, three, or four series Li+ cells, supporting up to 10 A of charge current, and is available in a 28-pin, 5x5-mm2 thin QFN package.

FEATURES

• NMOS-NMOS Synchronous Buck Converter

• Resistor-Programmable Switching Frequency between 300 kHz and 800 kHz

• 9 V-24 V Input Voltage Operation Range

• Support Two to Four Cells

• Analog Inputs with Ratiometric Programming via Resistors or DAC/GPIO

   – Charge Voltage 4-4.512 V/cell

   – Charge Current up to 10 A

   – Adapter Current Limit for DPM

• 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

• 150 mA Trickle-charge Current with ±33% Accuracy Down to Zero Battery Voltage

• Safety Protection

   – Input Overvoltage Protection

   – Battery Overvoltage Protection

   – Charger Overcurrent Protection

   – Thermal Shutdown Protection

   – FET/Inductor/Battery Short Protection

• Status and Monitoring Outputs

   – Adapter Present Indicator

   – Programmable Input Power Detect with Adjustable Threshold

   – Dynamic Power Management DPM with Status Indicator

   – Current Drawn from Input Source

• Charge Enable Pin

• Internal Soft-Start and Loop Compensation

• 25 ns Minimum Driver Dead-Time and 99.5% Maximum Effective Duty Cycle

• 28-pin, 5x5-mm2 QFN package

• Energy Star Low Quiescent Current Iq

   – < 10 μA Off-State Battery Discharge Current

   – < 1.5 mA Off-State Input Quiescent Current

APPLICATIONS

• Notebook and Ultra-Mobile PC

• Portable Data Capture Terminals

• Portable Printers

• Medical Diagnostics Equipment

• Battery Bay Chargers

• Battery Back-up Systems