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Superdiode MAX40203

25.03.2020

When developing devices in which the main power can be duplicated by a battery, it becomes necessary to limit the flow of reverse currents. The simplest and most common solution to this problem is to install a diode. The disadvantages of this solution are the voltage drop across the diode (usually 0,6 V at the pn junction of the diode, or 0,2 V in the case of a Schottky diode) and a reverse current of tens or even hundreds of milliamps. All this leads to a decrease in the battery life of the device and to its premature failure.

To solve this problem, Maxim Integrated has developed a unique solution. This is the ideal MAX40203 diode from the NanoPower line. The voltage drop across it is between 14 mV and 100 mV, and the leakage current is only 70 nA.

Another feature of an ideal diode is the presence of an EN terminal. When not powered, the MAX40203 completely blocks up to 6V in both directions.

It is important to note the presence of protection against short circuits. During a power surge or short circuit, the diode current is limited to 2A. The MAX40203 also protects itself and its downstream circuits from overcurrent using an overtemperature protection circuit.

Key features:

supply voltage 1,2...5,5 V;
direct current up to 1 A;
own consumption current 300 nA;
voltage drop below 100 mV (depending on load);
reverse current 70 nA;
package 4-WLP and SOT23-5.

To evaluate the benefits of this solution, developers are offered the MAX40203EVKIT development board with two ideal diodes.

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