Regulate 6V to 5V, regulate 4.5V to 5V.

[aallan]

Hi, I am using 3 x (4 x 1.5V AA batteries) to create a 6V power supply. I need to regulate this to 5V for my circuit.

Because of the application, the batteries will run until they are flat and the circuit fails. I need to extend the life of the circuit as long as possible.
Is it possible to regulate to 5V even when battery voltage drops to 5V and below?
If not, can anyone recommend a very low dropout voltage regulator?

Thanks in advance

 

[mtwieg]

Hi, I am using 3 x (4 x 1.5V AA batteries) to create a 6V power supply. I need to regulate this to 5V for my circuit.

Because of the application, the batteries will run until they are flat and the circuit fails. I need to extend the life of the circuit as long as possible.
Is it possible to regulate to 5V even when battery voltage drops to 5V and below?

You'll need a switching regulator like a Sepic or Cuk converter.