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I am going to make a regulator circuit with 3.3V 2A output using MAX1655 Step down controller.

I am going to use a solar panel with following specs for input: Max output voltage: 8.4V

Nominal voltage:6V

Current at MPP: 0.62A

As per the datasheet for MAX1655(at page 11) i have to use dual N-Channel Mosfet IRF7303 for the circuit diagram(3.3V /2A Output) at page 10 of the datasheet.

Questions: 1)Can i use two units of IRFZ44N instead of IRF7303 in the circuit(3.3V/2 A Output)? ( IRF7303 is unavailable at local shops near me and the Mosfet they have with closest specs to IRF7303 is IRFZ44N )

2)Would the MAX1655 Controller be damaged by the use of IRFZ44N? Would i face any other problems?

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    \$\begingroup\$ What is your input voltage ? \$\endgroup\$
    – Long Pham
    Jul 11, 2018 at 11:54
  • \$\begingroup\$ @LongPham I have updated the question \$\endgroup\$
    – Mrchief
    Jul 11, 2018 at 11:57
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    \$\begingroup\$ Compare the power available from the solar panel (6 * 0.62) with the power output you require (3.3 * 2) before going any further. \$\endgroup\$
    – user_1818839
    Jul 11, 2018 at 13:09
  • \$\begingroup\$ @BrianDrummond Yea i know that. But , the load current wont be 2A . It would be around 1A ,but i just wanted the circuit to be capable of delivering 2A Max. \$\endgroup\$
    – Mrchief
    Jul 11, 2018 at 13:12

1 Answer 1

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Not recommended. Look for a FET with a lower gate threshold voltage - the IRFZ44N has a maximum gate threshold voltage of 4 volts (this is the gate voltage when the FET starts to turn on.) Choose a FET with a similar gate threshold voltage and low on resistance, with similar input capacitance and gate charge.

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