SLUSAH0F October 2011 – November 2019 BQ25504
The boost charger needs an appropriately sized inductor for proper operation. The inductor's saturation current should be at least 25% higher than the expected peak inductor currents recommended below if system load transients on VSTOR are expected. Since this device uses hysteretic control, the boost charger is considered naturally stable systems (single order transfer function).
For the boost charger to operate properly, an inductor of appropriate value must be connected between LBOOST, pin 20, and VIN_DC, pin 2. The boost charger internal control circuitry is designed to control the switching behavior with a nominal inductance of 22 µH ± 20%. The inductor must have a peak current capability of > 300 mA with a low series resistance (DCR) to maintain high efficiency.
A list of inductors recommended for this device is shown in Table 1.
|Inductance (µH)||Dimensions (mm)||Part Number||Manufacturer(1)|