Calculation tool
BQ24650
Standalone 1-6 cell Buck battery charge controller with solar input and integrated MPPT
Data sheet
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
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.
Technical documentation
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Evaluation board
BQ24650EVM-639 — BQ24650 Evaluation Module Synchronous, Switch-Mode, Battery Charge Controller for Solar Power
The BQ24650EVM Evaluation Module assists users in evaluating the bq24650 synchronous battery charger. The bq24650 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 (...)
User guide: PDF
Reference designs
TIDA-00049 — High efficiency sync switch mode charger controller solar lithium battery charger reference design
This reference design is featured in solar lithium battery applications. This design, which contains an integrated switch-mode battery charge controller, provides input voltage regulation, which reduces charge current when input voltage falls below a programmed level. When the input is powered by a (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN (RVA) | 16 | Ultra Librarian |
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