LM61460-Q1: design check

Please see my comments and questions:

You said:

Output voltage range:2-8V, current configure:5V

How are they planning to implement this:

1. Will a design have a fixed output voltage (between 2 and 8V) or do they need adjustable output voltage? 

You said:

Q1: consider the cost saving, i choose one Electrolytic capacitor 100uF, esr=35mR, ripple current=1.7A,  with 1*10uF and 1*4.7uF, can you check it's OK or not->especially for 100uF EC?

Q2: choose one 10uF with 2*220nF at input pin, it's OK or not?

Schematic Review:

1. Ensure the voltage ratings of the input capacitors are appropriate. (Rated Voltage > Abs max voltage on the input rail - thumb rule is to use atleast 50V rated caps for 12V automotive systems). 

2. Ensure CVcc and CBoot are high quality ceramic caps (Eg: X7R) for good thermal stability. Ensure proper voltage rating. 

3. Inductor - Ensure the Saturation current and DC Current rating of the Inductor > ~6.3A (for a 5A design). 

4. The output capacitor values seem okay. However, since this is an adjustable output implementation - I would recommend:

a. Have a provision for feedforward cap and resistor. 

b. Check the load transient and bode plot at all output voltages to ensure proper operation across different operating conditions. 

You said:

Q3: Customer want to adjust the output voltage, do you have good solution for current BUCK LM61460?

Look at this app note: https://www.ti.com/lit/an/slyt777/slyt777.pdf

You said::

Add note: this buck is used for control external LED, then need to consider the short circuit to power supply and GND testing. also iso7637-3a/3b/ESD

These are system level tests and not device specific. You will have to implement external protection if you see the device abs max ratings getting violated. 

Got it!

Please refer to the design resources and the comments I shared in my previous reply.