- Chipset: MP2307DN
- Input voltage: 4.75V-23V
- Output voltage: 1V-17V
- Output current: peak 3A, continuous 1.8A
- Efficiency: up to 95% (@ Vin=5V, Vout=3.3V, Iout=300mA)
- Switching frequency: 340KHz
- Output ripple: 30mV (no load)
- Supply current: 1.5mA (no load)
- Working temperature: -40℃ ~ +85℃
- Module Size: 17*11*4mm
- Mounting: 15.24 x 8.9mm (0.6 x 0.35in)
Looking at zoomed picture, this looks like typical application from datasheet - except R1 has been replaced by trimpot. Soft-start is enabled.
Despite it's tiny size this step-down DC regulator is no pushover. We tested one unit at 12.00Vin and 5.00Vout, with 4.6Ω load, voltage dropped to 4.98V and input current went to 0.5A. That is approx 90% efficiency and less than 20mΩ internal resistance.
When set to 5.00V and input dropped to 5.00V, the output had 4.05V. Input range 6V to 20V, output voltage moved 5.00 - 5.02V.
This module can take some abuse too: when shorted, the input current went to 0.99A first and then slowly dropped to 0.3A as chip and inductor were heating up. After removing the short, the circuit worked as expected.
With input at 12V and output set to 5V, the module took 48mA without load. The 100uF/25V electrolytic capacitor lowered this to 21mA. With 47Ω output load, the input current was 82mA without 100uF, and 72mA with 100uF.
Built-in trim-pot is very sensitive and for fixed output applications we recommend to hold it's position by drop of glue or cut it out and replace with fixed value resistor. See the MP2307 datasheet for the math.
I would not recommend this module under 50mA load as linear regulator will do a better job in that range, but going over 50mA this regulator will work excellent. Also recommending additional electrolytic at least 100uF/25V at the input.