FEATURES
300 kHz NMOS-NMOS Synchronous Buck Converter
Stand-alone Charger Specifically for Lithium Phosphate
5V–28V VCC Input Operating Range, Support 1-7 Battery Cells
High-Accuracy Voltage and Current Regulation
– ±0.5% Charge Voltage Accuracy
– ±3% Charge Current Accuracy
– ±3% Adapter Current Accuracy
Integration
– Automatic System Power Selection from Adapter or Battery
– Internal Loop Compensation
– Internal Soft Start
– Dynamic Power Management (DPM) Safety Protection
– Input Over-Voltage Protection
– Battery Thermistor Sense Suspend Charge at Hot/Cold and
Automatically I CHARGE/8 at Hot/Cold or Warm/Cool
– Battery Detection
– Reverse Protection Input FET
– Programmable Safety Timer
– Charge Over-Current Protection
– Battery Short Protection
– Battery Over-Voltage Protection
– Thermal Shutdown Status Outputs
– Adapter Present
– Charger Operation Status
Charge Enable Pin 6V Gate Drive for Synchronous Buck Converter
30ns Driver Dead-time and 99.95% Max Effective Duty Cycle
Energy Star Low Quiescent Current Iq– < 15mA
Off-State Battery Discharge current
– < 1.5 mA Off-State Input Quiescent Current
APPLICATIONS
Power Tool and Portable Equipment
Personal Digital Assistants
Handheld Terminals
Industrial and Medical Equipment
Netbook, Mobile Internet Device and
Ultra-Mobile PC
DESCRIPTION
The bq24630 is highly integrated switch-mode battery charge
controller designed specifically for Lithium Phosphate battery. It
offers a constant-frequency
synchronous PWM controller with high accuracy current and voltage
regulation, charge preconditioning, termination, adapter current
regulation, and charge status monitoring. The bq24630 charges the
battery in three phases: preconditioning, constant current, and
constant voltage. Charge is terminated when the current reaches a
minimum user-selectable level. A programmable charge timer provides
a safety backup. The bq24630 automatically restarts the charge
cycle if the battery voltage falls below an internal threshold, and
enters a low-quiescent current sleep mode when the input voltage
falls below the
battery voltage