Diodes Incorporated
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Single Phase 3V BLDC All-In-One Fan and Motor Driver

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The AH5792 is a single chip solution for driving single-coil brush-less DC fans and motors. The AH5792 employs a bidirectional full bridge driver output stage for single coil fan motor applications. The device includes features such as Rotor Lock Protection with rotor lock detection and automatic self-restart to avoid damage to the coil when the rotor is blocked. The AH5792 also offers an externally control°C Tachometer (Frequency Generator Pin) open -drain output which makes it easier to connect with external interface such as hardware monitoring. The FG is half (1/2) the magnetic change frequency. The devices are packaged in SOT553 and SOT89-5L small outline packages for applications such as small motors like vibration motors or ultra thin cooling fans.


  • Support single-phase full wave min fan driver
  • Built-in Hall sensor input amplifier
  • Low voltage startup ( VDD = 1.8V )
  • Lock detection and automatic self-restart
  • Without external timing capacitor, Reduces the numbers of external component required
  • FG output
  • Low profile package : SOT553 and SOT89-5L
  • “Green” Molding Compound
  • Application(s)

  • 3.3V / 5V Min. DC Fans (Eight Pole)
  • Low Voltage / BLDC Motors
  • Micro-Vibration Motors
  • Product Specifications

    Product Parameters

    Operating Voltage (V) 1.8 to 5 V
    SupplyCurrent (mA) 3.5 mA
    Average OutputDrive Current (mA) 200, 300 mA
    Peak Output Current (mA) 400, 500 mA
    Typical Total RDS(ON)(NMOS and PMOS Combined) 3.3 @ 5V Ω
    Operating Point Bop Gauss (Min) 10
    Operating Point Bop Gauss (Typ) 25
    Operating Point Bop Gauss (Max) 50
    Release Point Brp Gauss (Min) -50
    Release Point Brp Gauss (Typ) -25
    Release Point Brp Gauss (Max) -10
    Soft-Switch -
    Speed Control VDD
    Lock Detect, Shut-Down and Auto Start Yes
    Frequency Generator (FG) and Rotation Detect FG RD
    Operating Ambient Temperature (°C) -40 to 10 °C

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    Technical Documents

    Recommended Soldering Techniques


    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-2594 2022-08-31 2023-02-28 Device End of Life (EOL)