A drop in replacement for TO-220 Linear Regulators using a DC-DC converter for higher efficiency
Designed by ketszim in Canada
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The seller may be offering an improved version or it may be hanging out on the beach, enjoying the retired life.
Swap out your LDO for a switcher today, with these designs for a modern take on the TO-220 mounted LM1117 and 78xx series LDO regulators! This project is my take on a quick and easy replacement for t…
Read More…This project is my take on a quick and easy replacement for the 3-pin LDO. The aim is to replace TO-220 linear regulators with a switching converter, in pursuit of higher efficiencies and current capacity.
Using a Recom RPX series DC-DC module for its small size and incorporating SMD feedback resistors and bulk capacitance on board allows for a drop-in replacement to existing LDO designs, while remaining in the same overall footprint as the counterpart.
As LM1117 LDOs have a different pinout to the 78xx series of regulators, I designed two versions of the layout.
| Output Voltage | R3 Value |
|---|---|
| 1.5V | 86k6 |
| 1.8V | 60k4 |
| 2.5V | 35k7 |
| 3.3V | 24k3 |
| 5.0V | 14k3 |
| 12V | 5k36 |
| 24V | 2k61 |
The device pinouts are:
The device is also fully open source, and all design/manufacturing files are available on Github.
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