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.