This is a Simple 1.5V Battery to 5V Voltage Converter Circuit Diagram. Stable and secure 5V DC (at 200mA max) from an
ordinary 1.5V AA sized cell. At the heart of this circuit is IC1 MAX756
from Maxim, which is a CMOS step-up DC-DC switching regulator for small,
low input voltage or battery-powered systems.
Simple 1.5V Battery to 5V Voltage Converter Circuit Diagram
MAX756 accepts a positive input voltage down to 0.7V and converts it
to a higher pin selectable output voltage of 5V (or 3.3V). Typical
full-load efficiency for the this IC is greater than 87%. Max756
combine a switch-mode regulator with an N-channel MOSFET, precision
voltage reference, and power-fail detector in a single monolithic
device. The MOSFET is a “sense-FET” type for best efficiency, and has a
very low gate threshold voltage to ensure start-up under low-battery
voltage conditions (1.1V typ).
The
circuit can be easily wired on a very small rectangular common PCB.All
connections should be kept as short as possible. If available,try to
add a good quality 8 pin DIP socket for IC1. Note that the power
inductor’s (L1) DC resistance significantly affects efficiency. For
highest efficiency, limit L1’s DC resistance to 0.03 Ohm or less. A
thru-hole type standard power inductor can be used. Similarly, the ESR
of all capacitors (bypass and filter) affects circuit efficiency. Best
performance is obtained by using specialized low-ESR capacitors.
