Packaging information
| Package | Pins VQFN (RVA) | 16 |
| Operating temperature range (°C) -40 to 85 |
| Package qty | Carrier 250 | SMALL T&R |
Features for the BQ24650
- 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
Description for the BQ24650
The BQ24650 device is a highly integrated switch-mode 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.
The BQ24650 charges the battery in three phases: pre-conditioning, constant current, and constant voltage. Charge is terminated when the current reaches 1/10 of the fast charge rate. The pre-charge timer is fixed at 30 minutes. The BQ24650 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.
The BQ24650 supports a battery from 2.1 V to 26 V with VFB set to a 2.1-V feedback reference. The charge current is programmed by selecting an appropriate sense resistor. The BQ24650 is available in a 16 -pin, 3.5 mm × 3.5 mm2 thin QFN package.