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Description
Most projects these days have multiple power supplies: say a battery or DC wall plug or USB for multiple powering options. Juggling these to have seamless hot-swap while avoiding back-powering is always a bit of a challenge: you want to keep things small, cheap, low power and of course reduce as much voltage drop as possible.
The Adafruit LM66200 Dual Ideal Diode breakout is a cute solution to dual supplies: it has back-voltage protection, and two 'ideal' diodes with RdsOn of 40 milliohms, support for 2.5A continuous draw and a separate enable input and status output.
Sure you could DIY the circuitry with multiple transistors, but this is compact and easy to use! Simply connect the two 2~5V power supplies to Vin1 and Vin2, the higher of the two will appear on Vout. Disable the output completely by pulling the On/Enable pin high. Check the Status pin, if desired, to see whether Vin1 or Vin2 is the selected supply.
To make it breadboard-friendly, we've placed it on a small PCB with 6 x 0.1" breakout pads. The chip and a 1 Megaohm enable-pulldown are soldered on top. We include a bit of header, some light soldering is required to attach the header - or use free wiring if you want to insert it directly into a circuit.
Specifications
- LM66200 Product information page
- Input voltage range: 1.6 V to 5.5 V
- Maximum continuous current: 2.5 A
- On-resistance: 40 mΩ (typical)
- Standby current: 50 nA (typical)
- Quiescent current: 1.32 μA (typical)
- Automatic diode switchover
- Controlled output slew rate: 1.3 ms (typical) at 3.3 V
- Reverse current blocking when VOUT > VINx
- Thermal shutdown
- Dimensions: 16.5mm x 10.0mm x 2.2mm
- Weight: 0.5g
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