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.
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|# Series Cells|
|Battery Charge Voltage (V)|
|Charge Current (Max) (A)|
|Charging Control Topology|
|Operating Temperature Range (C)|
|Approx. Price (US$)|
|Operating Vin (Max) (V)|
|Absolute Vin (safety rating) (Max) ((V))|
| 1 |
| Li-Ion/Li-Polymer |
|Temp Monitoring (Thermistor Pin)|
|-40 to 85|
|2.00 | 1ku|
|Sample & Buy|