Tool/software:
Due to space constraints I have to use a very small SMD inductor on the SW pin.
The datasheet recommends to use a 2.2µH inductor but these are not available in sizes smaller than 0603.
I found a small 1.5µH inductor: TDK PLE856CCA1R5M-1PT00 but I am unsure if this will work.
It is rated as:
- 1.5μH ±20% at 1MHz
- Isat 330mA (max), 400mA (typ)
- DCR 520mR (max), 450mR (typ)
My system uses
- 5V USB-input
- 1,8V SYS
- 1,8V LDO
- Typical current: ~ 4-50mA but I want to lay it out for peaks up to 150mA
In the "SLURAY9 — BQ25125 Setup Guide Tool" I can change the inductor to 1.5µA and with ISYS(Max) 150mA the Pk-Pk Inductor Ripple Current increases from 261,8mA to 384mA and Maximum Inductor Current from 280,9,9mA to 342mA.
Can I use this 1.5µH inductor?
Do I have to change other values e.g. the output capacitor (currently 10µF).
Will the efficiency drop a lot compared to the 2.2µH?
Is there anything else to consider when changing the inductor?
