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AP3503F (Not Recommended for New Design (NRND))

340kHz, 3A Synchronous DC-DC Buck Converter

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The AP3503F is a 340kHz fixed frequency, current mode, PWM synchronous buck (step-down) DC-DC converter, capable of driving a 3A load with high efficiency, excellent line and load regulation. The device integrates N-channel power MOSFET switches with low on-resistance. Current mode control provides fast transient response and cycle-by-cycle current limit. The AP3503F employs complete protection to ensure system security. Including output Over Voltage Protection, input Under Voltage LockOut, programmable soft-start, Over Temperature Protection to safeguard the circuit.


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  • Product Specifications

    Product Parameters

    Type Buck
    Efficiency (%) 95 %
    HS RDS(ON) (mΩ) 100 mΩ
    LS RDS(ON) (mΩ) 100 mΩ
    Frequency Typ (Hz) 340 kHz
    MinimumInput Voltage (V) 4.5 V
    MaximumInput Voltage (V) 18 V
    Output Current (mA) 3 A
    Output Voltage (V) 0.925 to 15 V
    Quiescent Current Typ (mA) 1.2 mA
    Shutdown Current Typ (µA) 0.1 µA

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    Orderable Part Number Status Package Environmental Compliance Packing Buy from Distributor /
    Contact Sales
    Request Samples
    Qty. Carrier
    AP3503FMPTR-G1 Not Recommended for New Design (NRND) SO-8 TPGP 4000 T&R Contact Sales
    AP3503UFMPTR-G1 Not Recommended for New Design (NRND) SO-8EP GREEN 4000 T&R Contact Sales

    Environmental Compliance Legend:
    LFF: Pb-Free Finish and RoHS 5/6
    TLFP: Totally Pb-Free Product and RoHS 6/6
    LFGP: Pb-free Finish and Green Product, RoHS 5/6 and Halogen Free
    TPGP: Totally Pb-Free and Green Product, RoHS 6/6 and Halogen Free
    GREEN: Halogen-free and RoHS compliant
    RoHS: RoHS compliant but NOT halogen-free

    Product Change Notices (PCNs)

    A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

    PCN # Issue Date Implementation Date Subject
    PCN-2555 2021-11-11 2022-05-11 Device End of Life (EOL)