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The AH5775 is a 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 system circuit 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.

To help protect the motor coil, the AH5775 provides Rotor Lock Protection which shuts down the output drive if rotor lock is detected. The device automatically re-starts 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 AH5775 is available in TO94 package.


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


  • Supports Single-Phase Full Wave BLDC Fan/Motor Drive
  • Built-In Hall Effect Sensor and Input Amplifier
  • Operating Voltage: 2.5V to 16V
  • Soft Switching for Low Noise DC Fan Motor Applications
  • Rotor Lock Protection (Lock detection, output shutdown and automatic re-start)
  • Overvoltage Shutdown
  • Thermal Protection
  • No External Timing Capacitor - Reduces the Numbers of External Components Required
  • Industry Standard TO94 Package
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device

Product Specifications

Product Parameters

Operating Voltage 2.5 to 18 V
Supply Current 3 mA
Average Output Drive Current 300 mA
Peak Output Current 800 mA
Typical Total RDS(ON) (NMOS and PMOS Combined) - Ω
Operating Point Bop Gauss (Min) 50
Operating Point Bop Gauss (Typ) 70
Operating Point Bop Gauss (Max) 90
Release Point Brp Gauss (Min) -90
Release Point Brp Gauss (Typ) -70
Release Point Brp Gauss (Max) -50
Soft-Switch Yes
Speed Control VDD
Lock Detect, Shut-Down and Auto Start Yes
Frequency Generator (FG) and Rotation Detect - RD
Operating Ambient Temperature -40 to 105 °C

Related Content

Quality Documentation

Technical Documents

Recommended Soldering Techniques


Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AH5775-P-B Digi-Key Electronics 1736 8/8/2020 Buy Now United States
AH5775-P-B Mouser Electronics Inc. 1913 8/8/2020 Buy Now United States


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