Kazkada reikejo, dabar netycia uztikau. Tai ne visai diodas - P kanalo 
mosfetas. Gal kam reikes:

The LTC®4411 is an ideal diode IC, capable of supplying up

to 2.6A from an input voltage between 2.6V and 5.5V. The

LTC4411 is housed in a 5-lead 1mm profile SOT-23

package.

The LTC4411 contains a 140mW P-channel MOSFET connecting

IN to OUT. During normal forward operation, the

drop across the MOSFET is regulated to as low as 28mV.

Quiescent current is less than 40mA for load currents up to

100mA. If the output voltage exceeds the input voltage, the

MOSFET is turned off and less than 1mA of reverse current

flows from OUT to IN. Maximum forward current is limited

to a constant 2.6A (typical) and internal thermal limiting circuits

protect the part during fault conditions.