AH2985

NEW PRODUCT AH2985 TWO PHASE HALL-EFFECT SMART FAN MOTOR CONTROLLER Description The AH2985 is a single-chip solution for driving two-coil brushless direct current (BLDC) fans and motors. The device includes a Halleffect 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. Pin Assignments (Top View) AH2985 The AH2985 is available in TO94 package. 12 3 4 1 : VDD 2 : DO 3 : DOB 4 : GND Features  Single-Chip Solution  Operating Voltage: 2.5V to 15V  Built-in Hall Sensor and Input Amplifier  Rotor Lock Protection (Lock Detection, Output Shutdown and 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) TO94 Applications  Two-Coil BLDC Cooling Fans  Low Voltage/ Low Power BLDC Motors Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more infor...