NRND = Not Recommended for New Design
TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER
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The AH2985 is a single-chip solution for driving two-coil brushless direct current (BLDC) fans and motors. The device includes a Hall-effect sensor, dynamic offset correction and two complementary open-drain output drivers with internal Zener diode protection. It is optimized for low start-up voltage.
To help protect the motor coils, the AH2985 provides Rotor Lock Protection which shuts down output drives if rotor lock is detected. The device automatically re-starts when the rotor lock is removed. Over temperature shutdown provides thermal protection for the device.
The AH2985 is available in TO94.
| Average OutputDrive Current (mA) | 500 |
|---|---|
| Frequency Generator (FG) and Rotation Detect | N/A |
| Lock Detect, Shut-Down and Auto Start | - |
| Operating Ambient Temperature (°C) | -40 to 105 |
| Operating Point Bop Gauss (Max) | 60 |
| Operating Point Bop Gauss (Min) | 5 |
| Operating Point Bop Gauss (Typ) | 30 |
| Operating Voltage (V) | 2.5 to 15 |
| Peak Output Current (mA) | 800 |
| Release Point Brp Gauss (Max) | -5 |
| Release Point Brp Gauss (Min) | -60 |
| Release Point Brp Gauss (Typ) | -30 |
| SupplyCurrent (mA) | 3.5 |
| Typical Total RDS(ON)(NMOS and PMOS Combined) | - |
| Typical Zener Breakdown Voltage (V) | - |
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) |
