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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|Number of series cells|
|Charge current (Max) (A)|
|Operating Vin (Min) (V)|
|Operating Vin (Max) (V)|
|Absolute Vin (safety rating) (Max) ((V))|
|Battery charge voltage (Min) (V)|
|Battery charge voltage (Max) (V)|
|Operating temperature range (C)|
|Package size: mm2:W x L (PKG)|
Programmable MPPT Setting
Temp Monitoring (Thermistor Pin)
|-40 to 85|
|VQFN | 16|
|16VQFN: 12 mm2: 3.5 x 3.5 (VQFN | 16)|