AH2985-P-B Diodes Incorporated

AH2985 TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER Description Pin Assignments The AH2985 is a single-chip solution for driving two-coil brushless (Top View) 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. AH29 85 1 : V To help protect the motor coils, the AH2985 provides Rotor Lock DD Protection which shuts down output drives if rotor lock is detected. 2 : DO The device automatically re-starts when the rotor lock is removed. Over temperature shutdown provides thermal protection for the 3 : DO B device. 4 : GND The AH2985 is available in TO94 package. 1 2 3 4 TO94 Features Single-Chip Solution Applications Operating Voltage: 2.5V to 15V Built-in Hall Sensor and Input Amplifier Two-Coil BLDC Cooling Fans Rotor Lock Protection (Lock Detection, Output Shutdown and Low Voltage/ Low Power BLDC Motors Automatic re-Start) Built-in Reverse Voltage Protection Diode Built-in Zener Protection for Output Drivers Average Output Current up to 500mA Package: TO94 Green Molding Compound Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See AH2985 Pin Descriptions Pin Number Pin Name Function 1 V Input Power DD 2 DO Output Pin 3 DOB Output Pin 4 GND Ground Functional Block Diagram V DD 1 Lock Detect, Shutdown and Automatic Re-start 2 Regulator DO Hall Plate 3 Amp. Control Logic DOB 4 GND 2 of 8 AH2985 September 2015 Diodes Incorporated www.diodes.com Document number: DS38175 Rev. 1 - 2 NEW PRODUCT