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

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The AH477A is an integrated Hall sensor with Hbridged output driver designed for brushless DC motor applications. The device includes an on-chip Hall sensor for magnetic sensing, an amplifier that amplifies the Hall voltage, a comparator to provide switching hysteresis for noise rejection, a bi-directional drivers for sinking and driving large current load. It also includes an internal bandgap regulator to provide temperature compensated bias for internal circuits and allows a wide operating supply voltage range. Placing the device in a variable magnetic field, if the magnetic flux density is larger than threshold BOP, the DO is turned to sink and DOB is turned to drive. This output state is held until the magnetic flux density reverses and falls below BRP, then causes DO to be turned to drive and DOB turned to sink.


  • On-Chip Hall Sensor
  • Operating Voltage: 3.5V to 18V
  • H-Bridge Output Drivers for Single Coil
  • Internal Bandgap Regulator for Temperature Compensation
  • Low Output Switching Current Noise
  • Operating Temperature: -20oC to 85oC
  • Low Profile TO-94 (SIP-4L) Package
  • ESD Rating: 6000V (Human Body Model)
  • Suitable for PWM Power Supply Control Speed

  • Application(s)

    · Single-coil Brushless DC Motor · Single-coil Brushless DC Fan

    Product Specifications

    Product Parameters

    Operating Voltage (V) 3.5 to 18 V
    SupplyCurrent (mA) 12.5 mA
    Average OutputDrive Current (mA) 250 mA
    Peak Output Current (mA) 600 mA
    Typical Total RDS(ON)(NMOS and PMOS Combined) 5.5 @ 5V Ω
    Operating Point Bop Gauss (Min) 5
    Operating Point Bop Gauss (Typ) N/A
    Operating Point Bop Gauss (Max) 70, 100
    Release Point Brp Gauss (Min) -70, -100
    Release Point Brp Gauss (Typ) N/A
    Release Point Brp Gauss (Max) -5
    Soft-Switch N/A
    Speed Control VDD
    Lock Detect, Shut-Down and Auto Start N/A
    Frequency Generator (FG) and Rotation Detect N/A RD
    Operating Ambient Temperature (°C) -20 to 85 °C

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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-2490 2020-10-22 2021-01-22 Additional Wafer Source (LiteOn Semiconductor Corp.)