1 Features
1• Maximum Power Point Tracking (MPPT) capability
by input Voltage regulation
• Programmable MPPT setting
• 5-V to 28-V Input solar panel
• 600-kHz NMOS-NMOS Synchronous buck
controller
• Resistor programmable float voltage
• Accommodates Li-Ion/Polymer, LiFePO4, lead
acid chemistries
• Accuracy
– ±0.5% Charge voltage regulation
– ±3% Charge current regulation
– ±0.6% Input voltage regulation
• High Integration
– Internal loop compensation
– Internal digital soft start
• Safety
– Input overvoltage protection
– Battery temperature-sensing
– Battery absent detection
– Thermal shutdown
• Charge status outputs for LED or host processor
• Charge enable on MPPSET pin
• Automatic sleep mode for low power consumption
– < 15-μA OFF-state battery discharge current
• Small 3.5 × 3.5 mm2 16-pin QFN package

2 Applications
• Solar-powered applications
• Remote monitoring stations
• Portable handheld instruments
• 12-V to 24-V Automotive systems
• Current-limited power source

3 Description
The BQ24650 device is a highly integrated switchmode
battery charge controller. It provides input
voltage regulation, which reduces charge current
when input voltage falls below a programmed level.
When the input is powered by a solar panel, the input
regulation loop lowers the charge current so that the
solar panel can provide maximum power output.
The BQ24650 offers a constant-frequency
synchronous PWM controller with high accuracy
current and voltage regulation, charge
preconditioning, charge termination, and charge
status monitoring.