We are using MAX20039 as an SMPS in our project with 400kHz switching frequency and 5V fixed output. The output current shall be around 150mA. The SMPS shall operate from 3 to 16V range.
In the evaluation board the compensation RC block selected as Cf = 100pf, Cc = 3300pf and Rc = 22k
1-Are these values suitable for our application and is there any Excel tool for calculating compensation RC blocks?
2- There is no diode connection for the BST pins in the datasheet so is the diode connection from BIAS and BST pins mandatory? (BAT54A in eval board)
In the datasheet for 5V fixed output, there is a statement "Connect FB to VCC to enable the fixed output voltage (5V)"
3-Should I connect VCC and FB pins with a resistor? Is this mandatory?
For the VCC capacitance datasheet recommends minimum 1uF as a capacitance. Eval board 2u2 and 100n capacitance connected with VCC pin but in eval board BOM it says 2x 2u2 capacitance. In our schematic, there is a 2u2 capacitance (CL05A225KP5NSNC) with %70 DC bias derating at 5V and 100n capacitances at the VCC pin.
4-How should I connect the VCC capacitances?
In the datasheet 10k pullup resistor is recommended but in the eval board, 51k is used for PGOOD.
Additionally, for the evaluation, SPS and FSYNC pins are connected like the attached image 0R resistors assumed as jumpers for the evaluation.
5-What pullup resistor value shall be more reliable for the SMPS operation?
Best Regards.