bq24705 - Texas Instruments

bq24705 Host-Controlled Multi-Cell Battery Charger

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 microcontro.

Features

1
•2 NMOS-NMOS Synchronous Buck Converter with 600 kHz Frequency and >95% Efficiency
• 30-ns Minimum Driver Dead-time and 99.5% Maximum Effective Duty Cycle
• 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
• Integration
  – Internal Loop Compensation
  – Internal Soft-Start
• Safety
  – Input Overvoltage Protection (OVP)
  – Dynamic Power Management (DPM) with Status Indicator
• Supports Two, Three, or Four Li+ Cells
• 5
  – 24 V AC/DC-Adapter Operating Range
• Analog Inputs .