LDO / Buck with digital control i/f to regulate the output

Josef Alt

Intellectual 1755 points

Hi,

my customer needs to adjust Vout in steps of 20mV (from 1.8V to 22V).

Do we have a LDO / Buck with a digital control interface to allow such functionality?

Thanks

Josef

over 4 years ago

0 Febin over 4 years ago

TI__Mastermind 25430 points

Hi Josef,

Is the Vout from 1.8V to 2.2V or 22V?

Are you looking for I2C interface to dynamically control the Vout?

What is the Vin range, max Load?

Regards,

Febin

0 Josef Alt over 4 years ago

TI__Intellectual 1755 points

Hi Febin,

Vin 23-26VDC

Iload_max 100mADC (constant load current typ. 1-5mA)

Vout adjustable from about 1.8V up to 20V (or if possible to 22V)

Yes I2C (or SPI) for dynamically tune the Vout. Settling time is not as important.

Please advise on possible solutions.

Best Regards

Josef

0 Stephen Ziel over 4 years ago in reply to Josef Alt

TI__Mastermind 37005 points

Hi Josef,

We do not have anything programmable with I2C or SPI. However we do have something that can meet this intent with our ANY OUT devices. The concept with the ANY OUT device is to include the resistors in the resistor divider directly inside the LDO. Then you tie the correct resistors to GND to set the output. You can use an IO bus to tie these resistors to GND to dynamically change Vout. You can also use the following blog to learn how to increase the resolution to meet the customer needs. I would suggest using the TPS7A4701 if you choose to go this route.

https://e2e.ti.com/blogs_/b/powerhouse/posts/increasing-resolution-for-any-out-programmable-output-voltage-devices

Thanks,

Stephen

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LDO / Buck with digital control i/f to regulate the output