DC-DC Converter

Hi Phil,

Thanks for your support.

In between i got the complete requirement from client. Please find the below voltage min / Typ / max values.

All the voltage should adjust through I2C bus 5mV step size & max current each rail is 2A

In the below table 0.75 & 0.55 V are buck converter output & 1.8, 1.2 & 0.85 are LDO control.

could you please help and suggest the as per below

1. single PMIC output voltage configuration 

2. Individual voltage rail buck / LDO's suggest through I2C DAC to set output voltage.

Please let me know any more details required.

Thanks and Regards,

Arumugam.P

What's about VIN range? 

Input voltage range is 2.7 to 4.5V ..

Thanks and Regards,

Arumugam.P

LDO's output current can be OK if not meet 2A.

Hi, Arumugam,

  The group I'm working for in TI has many multi-rails PMIC devices with OTP configurable but usually need about 1M units business size for OTP kickoff; if you do meet the requirement, please contact with our local sales for process; If not, please pick one from the link below:

https://www.ti.com/power-management/non-isolated-dc-dc-switching-regulators/step-down-buck/buck-converter-integrated-switch/products.html#p238max=3.8;7&p236typ=0.000028;0.05&~p2192=I2C/PMBus

Hi Phil,

Thanks for your support.

Based on on your feedback I understand there is no standard PMIC for our requirement.

I will Pick anyone PMIC which suit for my requirement and select the DAC for digital control.

Thanks and Regards,

Arumugam.P 

Hi, Arumugam,

  We greatly appreciated your interest with our devices! Please let's know if you need our PMICs with business size met and then we can start an OTP kickoff. 

  Would you please help to close this ticket?

Hi Phil,

Sorry for again open this ticket.

I am facing challenging to select the LDO's for below requirement.

Can you please help me on this. 

Please note :There is a provision to have to change the voltage from Min V to Max V through Digital pot or DAC

Thanks and Regards,

Arumugam.P

Hi, Arumugam,

 All PMIC devices from what I'm in charge are customized OTP devices; there is no one with voltage changeable from Min V to Max V through Digital pot or DAC.

Hi Phil,

Thanks for your support 

Refer the Page number 4 given below app note. The TPS62088 is possible to control from 0.3V to 1.8V  through Digital POT or external DAC.

https://www.ti.com/lit/an/slyt777/slyt777.pdf?ts=1599062644491&ref_url=https%253A%252F%252Fwww.google.com%252F

I have selected BUCK based on the reference with above app note.

Now i am looking for LDO to change the output voltage through external DAC.

I fount TI LDO # LP38841-ADJ in which Quiescent Current is more (32mA) . 

Due to Quiescent Current is more the efficiency is very less with my output Load current ~ 6 mA.

TI have any part with less Quiescent current approx (25uA) with LP38841 electrical spec?

Thanks and Regards,

Arumugam.P

Hi, Arumugam,

  All devices from what I'm in charge can't change the voltage from Min V to Max V through Digital pot or DAC.

Hi Phil,

Thanks for Your support.

I haven't understand your answer "what I'm in charge can't change the voltage from Min V to Max V "

Refer attached tool downloaded from TI. I have used that tool to control the output voltage through DAC.

Design Tool for Output Voltage Adjustment using a DAC.xlsx