AH2984

Two Phase 5V/12V All-In-One BLDC Fan and Motor Driver with Output Zener Clamp and Reverse Supply Protection

Datasheet

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Description

The AH2984 is a single-chip solution for driving two-coilbrushless 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 AH2984 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.

Application(s)

Two-coil BLDC Cooling Fans

Low Voltage/ Low Power BLDC Motors

Product Specifications

Product Parameters

Operating Voltage (V)	2.5 to 15 V
SupplyCurrent (mA)	3.5 mA
Average OutputDrive Current (mA)	500 mA
Peak Output Current (mA)	800 mA
Typical Total R_DS(ON)(NMOS and PMOS Combined)	1.0 @ 12V Ω
Typical Zener Breakdown Voltage (V)	33 V
Operating Point Bop Gauss (Min)	5
Operating Point Bop Gauss (Typ)	30
Operating Point Bop Gauss (Max)	60
Release Point Brp Gauss (Min)	-60
Release Point Brp Gauss (Typ)	-30
Release Point Brp Gauss (Max)	-5
Lock Detect, Shut-Down and Auto Start	Yes
Frequency Generator (FG) and Rotation Detect	- RD
Operating Ambient Temperature (°C)	-40 to 105 °C

Technical Documents

Recommended Soldering Techniques

TN1.pdf

RoHS CofC

RoHSFile