Diodes Incorporated
U DFN2020 6 Type F

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High Performance Low Noise Single Phase 5V/9V/12V/15V BLDC All-In-One Fan and Motor Driver with PWM Speed Control Standby Mode Overvoltage Protection and Thermal Shutdown

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The AH5773 is a high performance single chip solution for driving single-coil brushless direct current (BLDC) fans and motors. The integrated full-bridge driver output stage uses soft switching to minimize audible switching noise and electromagnetic interference (EMI) providing a low noise solution.
To simplify circuit design and minimize external components, the device integrates a stable high sensitivity Hall-Effect sensor, voltage and temperature compensated internal references, amplifiers and the output H-bridge power switches with low RDSON. For system flexibility, the motor speed can be controlled by changing the duty ratio of the PWM signal at the PWM pin or adjusting the supply voltage.
To help protect the motor coil, the AH5773 provides Rotor Lock Protection which shuts down the output drive if rotor lock is detected. The device automatically restarts when the rotor lock is removed. In case of over voltage, the device shuts down the output drive and enters standby mode to help prevent over voltage stress on the coil. Over temperature shutdown provides thermal protection for the device. The device enters standby mode when PWM pin is pulled low for longer than 65ms. In standby mode, AH5773 consumes less than 100uA.
A Tachometer output is provided by open-drain Frequency Generator (FG) Pin which allows external interface to monitor motor rotation or speed. The FG output is the magnetic change frequency.
The AH5773 is available in space saving and low profile MSO8-EP packages.


  • Supports Single-phase Full Wave BLDC Fan/Motor Drive
  • Wide Operating Voltage Range: 2.4V to 18V
  • Built-in High Sensitivity Hall Effect Sensor
  • Built-in H-Bridge with Low RDSON Resistance
  • PWM Input for Speed Control
  • Standby Feature with IDD <100μA
  • Soft Switching for Low Noise DC Fan Motor Applications
  • Rotor Lock Protection with Automatic Restart
  • Toff Clear when PWM is Low for Greater than 65ms
  • Over Voltage Shutdown
  • Thermal Protection
  • Tachometer (FG) Output
  • Small Low Profile Package: MSOP8-EP with Exposed Pads for Power Handling Capability
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device


  • 5V / 9V/ 12V / 15V Min. BLDC Cooling Fans and Motors
  • Netbook/ Notebook and Desktop BLDC Fans
  • Instruments Cooling Fans
  • Medium Voltage/ Low Power BLDC Motors

Product Specifications

Product Parameters

Operating Voltage (V) 2.4 to 18 V
SupplyCurrent (mA) 3.17 mA
Average OutputDrive Current (mA) 500 mA
Peak Output Current (mA) 1000 mA
Typical Total RDS(ON)(NMOS and PMOS Combined) 1.26 Ω
Operating Point Bop Gauss (Min) 5
Operating Point Bop Gauss (Typ) 20
Operating Point Bop Gauss (Max) 35
Release Point Brp Gauss (Min) -35
Release Point Brp Gauss (Typ) -20
Release Point Brp Gauss (Max) -
Soft-Switch Yes
Speed Control VDD PWM
Lock Detect, Shut-Down and Auto Start Yes
Frequency Generator (FG) and Rotation Detect FG RD
Operating Ambient Temperature (°C) -40 to 105 °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-2654 2024-02-15 2024-04-28 Device End of Life (EOL)
PCN-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site


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