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Single Phase 12V All-In-One BLDC Fan and Motor Driver

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AH5771 is the integrated Hall sensor with output drivers designed for electrical commutation of brush-less DC motor application. The device is as follows: one-chip Hall voltage generator for magnetic sensing; the error amplifier that amplifies the Hall voltage; a comparator is to provide switching hysteresis for noise rejection; the full bridge driver for sinking and driving current load. Internal band gap regulator is used to provide temperature compensated bias for internal circuits and allows a wide operating supply voltage range. 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. AH5771 is rated for operation over-temperature range from -40℃ to 100℃ and voltage range from 2.5V to 15V. The device is available in low profile package SIP-4L.


  • Support single-phase full wave min fan driver
  • Built-in Hall sensor input amplifier
  • Low voltage startup ( Vdd=2.5V )
  • Lock detection and automatic self-restart
  • Without external timing capacitor, Reduces the numbers of external component required
  • Low profile package : SIP-4L
  • SIP-4L: Available in “Green” Molding Compound (No Br, Sb)
  • Lead Free Finish / RoHS Compliant
  • Product Specifications

    Product Parameters

    Operating Voltage (V) 2.5 to 15 V
    SupplyCurrent (mA) 3.5 mA
    Average OutputDrive Current (mA) 200 mA
    Peak Output Current (mA) 400 mA
    Typical Total RDS(ON)(NMOS and PMOS Combined) 5.5 @ 5V Ω
    Operating Point Bop Gauss (Min) 10
    Operating Point Bop Gauss (Typ) 30
    Operating Point Bop Gauss (Max) 50
    Release Point Brp Gauss (Min) -50
    Release Point Brp Gauss (Typ) -30
    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 - RD
    Operating Ambient Temperature (°C) -40 to 100 °C

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    Technical Documents

    Recommended Soldering Techniques


    RoHS CofC

    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-2380 2018-11-07 2019-05-07 Device End of Life (EOL)