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Switch between LDO and switched regulator

G

Gopal

Jan 1, 1970
0
Hi,
A basic design question: Can we implement some sort of "if
condition" in a circuit to choose between LDO and switched regulator.
The application is something like this.
I have a device that is ti be run at 4V to 36V range. I know thats
pretty big range. And my micro and other stuff works at 3.3V. Now, as
per power efficiency of the regulators, I know LDo is better at
voltages close to 4V and switched regulator is efficient at voltages
close to 36V. So, is there any way a circuit can be designed to choose
the LDOs deoending upon on the input voltage.

Thank you

Gopal
 
J

John Larkin

Jan 1, 1970
0
Hi,
A basic design question: Can we implement some sort of "if
condition" in a circuit to choose between LDO and switched regulator.
The application is something like this.
I have a device that is ti be run at 4V to 36V range. I know thats
pretty big range. And my micro and other stuff works at 3.3V. Now, as
per power efficiency of the regulators, I know LDo is better at
voltages close to 4V and switched regulator is efficient at voltages
close to 36V. So, is there any way a circuit can be designed to choose
the LDOs deoending upon on the input voltage.

Thank you

Gopal

An LDO will be about 80% efficient dropping 4 to 3.3. A good switcher
could beat this over the entire range.

John
 
G

Gopal

Jan 1, 1970
0
Hi,
A "good switching regulator" may again take more components than
LDO. Do you have any good design schematic that can regulate 3.3V from
4V-36V .

Thanks

Gopal
 
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