Diodes Incorporated

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U DFN3030 10

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1.5A Low Dropout Linear Regulator with Programmable Soft-Start

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The AP7173 is a 1.5A low-dropout (LDO) linear regulator that features a user-programmable soft-start, an enable input and a power-good output. The soft-start reduces inrush current of the load capacitors and minimizes stress on the input power source during start-up. The enable input and power-good output allow users to configure power management solutions that can meet the sequencing requirements of FPGAs, DSPs, and other applications with different start-up and power-down requirements. The AP7173 is stable with any type of output capacitor of 2.2μF or more. A precision reference and feedback control deliver 2% accuracy over load, line, and operating temperature ranges. The AP7173 is available in both DFN3030-10 and SO-8EP packages.


  • Low VIN and wide VIN range: 1.0V to 5.5V
  • Bias voltage (VVCC) range: 2.7V to 5.5V
  • Low VOUT range: 0.8V to 3.3V
  • Low dropout: 165mV typical at 1.5A, VVCC = 5V
  • 2% accuracy over line, load and temperature range
  • Power-Good (PG) output for supply monitoring and for sequencing of other supplies
  • Programmable soft-start provides linear voltage startup
  • Bias supply permits low VIN operation with good transient response
  • Stable with any output capacitor ≥ 2.2μF
  • DFN3030-10 and SO-8EP: available in “Green” molding compound (No Br, Sb)
  • Lead-free finish/ RoHS Compliant
  • Application(s)

  • PCs, Servers, Modems, and Set-Top-Boxes
  • FPGA Applications
  • DSP Core and I/O Voltages
  • Post-Regulation Applications
  • Applications With Sequencing Requirements
  • Product Specifications

    Product Parameters

    Iq (max) (µA) 2000
    Iq (typ) (?A) 1000
    AEC Qualified No
    Compliance (Only Automotive supports PPAP) Standard
    Type LDO
    Output options Adjustable
    Iout (A) 1.5
    Vin (Max) (V) 5.5
    Vin (Min) (V) 1
    Vout (min) 0.8
    Vout (max) 3.6
    Adjustable VFB (V) 0.8
    Accuracy 25C 1
    VDROPOUT (Max) (V) at Max Current and Max Ouput Voltage 0.27
    PSRR (dB) 1kHz 60
    Operating Temperature (Ambient) (°C) -40 to 85
    Enable Active Yes (High)
    Channels 1
    Output Discharge No
    Power Good Open Drain
    Reverse Protection No
    VCTL Function Yes

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    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-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site