Datasheet Texas Instruments BQ24705

Not Recommended for New Designs bq24705
www.ti.com. SLUS779B – DECEMBER 2007 – REVISED MARCH 2009 600-kHz, Host-Controlled Multi-Cell Battery Charger With Input Overvoltage Protection
FEATURES APPLICATIONS 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 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-mΩ
Sense Resistor)
– Adapter Current Limit (DPM) Status and Monitoring Outputs
– AC/DC Adapter Present with Programmable
Voltage Threshold
– DPM Loop Active (DPMDET)
– Current Drawn from Input Source Supports Any Battery Chemistry: Li+, NiCd, …