I am looking for recommendations for variable LDO USB 5 V input and variable output voltage from 1.6 to 5.5 V. voltage range done by a variable resistor. With current draw up to 50mA.
Thanks
A low drop out regulator, LDO, can’t increase the voltage or even match the input voltage.
To get 1.6 to 5.5 from a 4.75 to 5.25 (USB spec) input you can use a buck-boost switching regulator.
You could also use boost regulator to get the voltage up to say 7 volts followed by an adjustable linear LDO to get the final range.
Hi, thank you so much for your response. Kindly recommend a few part numbers
Thanks
Take a look at DigiKey part MCP1253-ADJI/MS-ND , this should get you started.
1 Like
Thank you so much for the recommendation.
Hi Steve,
I am trying to work with the component you recommended. I am a confused how to connect the pot I calculated. Kindly show me.
Thank you so much in advance.
Ephraim Ben-Ishai 4X5EG
You wire the potentiometer as a rheostat like this:
FYI
A potentiometer adjusts circuit voltage by varying the ratio of two resistances.
A rheostat adjusts circuit current by varying a single resistance.
All potentiometers can be wired as rheostats, dedicated rheostats are rarely usable as a potentiometer.
Your circuit uses a rheostat plus a fixed resistor to create a potentiometer that only adjusts in one direction. A very common application that greatly improves adjustability, stability and provides a low limit greater than the lowest voltage.
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Thank you so much!
Ephraim Ben-Ishai 4X5EG