This discrete LDO kit delivers 2 A continuous with a very low dropout.
For a nylon 3D printed enclosure, please see my other listing 267715531314. To print your own, search "M9OMS" on Thingiverse.
| Parameter | Value | Note |
|---|---|---|
| Input voltage | 8–18 V DC | — |
| Output voltage | 9.0 / 12.0 / 13.8 V | Set via header pins, trim via R7 |
| Max output current | 2 A | Continuous |
| Dropout voltage | <100 mV | At 1 A |
| Quiescent current | ~6 mA | Vin = 13 V |
| Load regulation | ~20 mV / ~40 mV | 0.1 A to 1 A / 0.1 A to 2 A |
| Transient response | ~25-40 µs recovery | 0.1 A ↔ 1.5 A |
A no-load offset of 20-30mV is exhibited, resolving at currents above 30 mA. Adding a pre-load resistor is recommended for applications requiring tight regulation accuracy at very light loads.
Input and output through-hole pads accommodate up to 18 AWG stranded wire.
Power dissipated in the pass element is:
The supplied heatsink is rated for 1.5 W continuous, or 3 W at 50% duty cycle (typical for SSB/CW radio operation). At a 13.8 V input and 12 V / 1 A output, dissipation is 1.8 W - typical intermittent operation will not require external cooling. For higher input voltages, increased current, or continuous-duty operation at maximum load, external cooling is required. Bottom-mount the PMOS to couple the pass element directly to a metal enclosure or a larger external heatsink.
The PCB includes a clearance hole to facilitate bottom-mounting. Always use high-quality thermal paste for optimal heat transfer.