SKU: TH1997
The Adafruit LM66200 Ideal Dual Diode Breakout Board provides an easy and efficient way to automatically switch between two power sources such as USB, battery, or DC input. It uses low-loss ideal diode circuitry with ~40 mΩ RdsOn to minimize voltage drop while safely preventing back-powering between supplies.
The Adafruit LM66200 Ideal Dual Diode Breakout Board provides an easy and efficient way to automatically switch between two power sources such as USB, battery, or DC input. It uses low-loss ideal diode circuitry with ~40 mΩ RdsOn to minimize voltage drop while safely preventing back-powering between supplies.
Supporting 2–5 V inputs and up to 2.5 A continuous current, the board includes enable and status pins for power control and monitoring. Its compact, breadboard-friendly design with 0.1″ breakout pads makes it ideal for portable and dual-power electronics projects.
Technical details for Adafruit LM66200 Ideal Dual Diode Breakout Board.
| Specification | Details |
|---|---|
| Product Type | Dual Ideal Diode / Power OR-ing Breakout Board |
| Controller IC | LM66200 |
| Input Voltage Range | 2 V to 5 V DC (Vin1, Vin2) |
| Output Voltage | Automatically selects higher of Vin1 or Vin2 |
| Continuous Output Current | Up to 2.5 A |
| On-Resistance (RdsOn) | ~40 mΩ (typical) |
| Back-Power Protection | Yes (prevents reverse current between supplies) |
| Enable Control | Active-high enable pin with onboard 1 MΩ pull-down |
| Status Output | Indicates which input supply is active |
| Breakout Pins | 6 × 0.1″ (Vin1, Vin2, Vout, GND, EN, Status) |
| Mounting / Prototyping | Breadboard-friendly PCB |
| Headers Included | Yes (requires soldering) |
| Typical Applications | USB + battery power switching, backup power, portable devices |
| Pin | Description |
|---|---|
| VIN1 | First power input (2–5 V DC). Can be connected to USB, battery, or DC supply. |
| VIN2 | Second power input (2–5 V DC). The higher of VIN1 or VIN2 is automatically selected. |
| GND | Common ground for both input supplies and the output. |
| VOUT | Power output. Provides the higher of VIN1 or VIN2 with minimal voltage drop. |
| !ON (EN) | Enable control pin. Pull high to disable the output. Onboard 1 MΩ pull-down enables output by default. |
| STA | Status output indicating which input supply is currently active. |
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