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LT1934 tested Quiescent current too high than Quiescent current in datasheet

LT1934 is used for 3.3V voltage conversion output, the input voltage is 13.5V, and the output voltage is 3.3V. Refer to the typical circuit design in the manual. The measured VIN=10V, the quiescent current in the open-circuit state is 30ua-230ua, and it stays at about 40ua most of the time, which is quite different from the manual quiescent current. The following is the schematic diagram and PCB, where VIN=10V, VBOOST=7V, VSW=3.33V, VFB=1.34V are measured during the test.

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  • Hi PY,

    Thanks for application of LT1934.

    There are some reasons that may cause the quiescent current higher than expected.

    If the load is connected to a rail or other circuit that may has leakage current in open-circuit state, the quiescent current would be higher. In addition, the selection of diode, D8, has different leakage current that also affect the quiescent current to some extent. The switching operation of the circuit can also be checked if convenient. If there are some switching operation in the circuit, the quiescent current would be higher.

    Best regards,

    Andrew

Reply
  • Hi PY,

    Thanks for application of LT1934.

    There are some reasons that may cause the quiescent current higher than expected.

    If the load is connected to a rail or other circuit that may has leakage current in open-circuit state, the quiescent current would be higher. In addition, the selection of diode, D8, has different leakage current that also affect the quiescent current to some extent. The switching operation of the circuit can also be checked if convenient. If there are some switching operation in the circuit, the quiescent current would be higher.

    Best regards,

    Andrew

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