A 4-layer PCB with a solid ground plane and a separate power plane is recommended. The device should be placed near the battery, and the power inductors should be placed close to the device. A thermal pad should be used to connect the device to the PCB.
The inductor value depends on the input voltage, output voltage, and switching frequency. A good starting point is to use the inductor value calculation formula provided in the datasheet. The inductor value should be selected to ensure that the inductor current ripple is within 20-40% of the average inductor current.
The BQ24745RHDR can operate in ambient temperatures up to 105°C. However, the device's junction temperature should not exceed 125°C. The device's thermal performance should be evaluated using thermal simulation tools or thermal testing.
The BQ24745RHDR has a programmable charge voltage and current limit. The device should be configured based on the specific battery chemistry's recommended charging profile. The device's configuration should be evaluated using the device's evaluation module or a custom PCB.
A low-ESR ceramic capacitor with a value of 10-22uF is recommended. The input capacitor should be placed close to the device's input pins to minimize noise and ensure stable operation.
BQ24745RHDR datasheet
by Texas Instruments
