Diodes Incorporated
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AH9485 (Not Recommended for new design)

NRND = Not Recommended for New Design

Single Phase Low Noise Smart Motor Driver

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The AH9485 is a single chip solution for driving a single phase (coil) brushless DC motors. It integrates the motor driver and the high sensitivity Hall effect sensor to simplify the system circuit and PCB design for simpler solutions.

Rotor lock-detect, shutdown and auto-restart functions help to prevent the motor from over-heating when rotor is locked and restarts the motor after the lock is removed.

The AH9485 has built-in open drain tachometer frequency generator (FG) and rotation detection (RD) outputs to allow external interface to monitor motor rotation, speed or rotor locks conditions easily. The FG provides magnetic change frequency while the RD provides the rotor status.

The full bridge output stage uses “soft-switching” technique to minimize the audible switching noise (vibration and acoustic noise) and electromagnetic interference (EMI) providing a low noise solutions

Over-temperature shutdown provides thermal protection for the device. An external DC voltage or a PWM (pulse-width modulation) signals on the PWM pin can be used to control the motor speed.

The AH9485 is packaged in TSOT26F.


  • Internal Full Bridge Driver
  • High Sensitivity Integrated Hall Sensor
  • Low and Wide Supply Voltage Range of 2.0V to 6V
  • Soft Switching for Low Noise
  • Rotor Lock Protection and Auto-restart
  • DC Voltage or PWM Signal Speed Control
  • Thermal Protection
  • Operating Temperature range of -40ºC to 105ºC
  • Flat pin TSOT26F Package
  • Totally Lead-Free & Fully RoHS Compliant
  • Halogen and Antimony Free. “Green” Device


  • 5V Low Noise BLDC Cooling Fans
  • Low Voltage / Low Power BLDC Motors
  • Notebook / VGA DC Fans / Blowers
  • Micro-Motors

Product Specifications

Product Parameters

Average OutputDrive Current (mA) 300
Frequency Generator (FG) and Rotation Detect FG
Lock Detect, Shut-Down and Auto Start -
Operating Ambient Temperature (°C) -40 to 85
Operating Point Bop Gauss (Max) 50
Operating Point Bop Gauss (Min) -
Operating Point Bop Gauss (Typ) 25
Operating Voltage (V) 2 to 6
Peak Output Current (mA) 500
Release Point Brp Gauss (Max) -
Release Point Brp Gauss (Min) -50
Release Point Brp Gauss (Typ) -25
Soft-Switch -
Speed Control -
SupplyCurrent (mA) 1.8
Typical Total RDS(ON)(NMOS and PMOS Combined) -

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