BQ24650 VA
Texas Instruments
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.
Parts in family
Technical Specifications
| Lead Free Status | Yes |
| ROHS Compliance | Compliant |
| # Series Cells | >4 Cells |
| Approx. Price (US$) | 2.00 1ku |
| Battery Charge Voltage(Max)(V) | 26 |
| Battery Charge Voltage(Min)(V) | 2.1 |
| Battery Charge Voltage(V) | Adjustable |
| Cell Chemistry | Lead Acid,Li-Ion,Li-Polymer,LiFePO4 |
| Charge Current(Max)(A) | 10 |
| Control Topology | Switch-Mode |
| Estimated Package Size (WxL)(mm2) | [pf]16VQFN[/pf] |
| Operating Temperature ange(C) | -40 to 85 |
| Package Group | VQFN |
| Primary Charge Termination Method | Taper Current |
| Special Features | Temp Monitoring,Solar Input,Over Voltage Protection |
| Switching Frequency(Min)(kHz) | 510 |
| Switching Frequency(kHz) | 600 |