Adafruit LM66200 Ideal Dual Diodes Breakout

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 compact solution to dual power supplies: it provides back-voltage protection, and features two 'ideal' diodes with a low RdsOn of 40 milliohms, supporting 2.5A continuous current draw, a separate enable input, and a status output.

You can simply connect two 2.5V to 5V power supplies to Vin1 and Vin2. The higher of the two input voltages will appear on Vout. The output can be disabled completely by pulling the On/Enable pin high. The Status pin indicates which input supply is selected.

The breakout is breadboard friendly, with a small PCB measuring 16.5mm x 10.0mm x 2.2mm (0.6" x 0.4" x 0.1") and 6 x 0.1" breakout pads. The chip is pre-soldered with a 1 Megaohm enable-pulldown resistor. Some light soldering is required to attach the included 6-pin header, or you can wire it freely in your circuit.

• 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 protection