AM9789MMTR-G1

AM9789 SINGLE PHASE FULL-WAVE MOTOR DRIVER FOR SILENT FAN MOTOR Description Pin Assignments (Top View) The AM9789 is a low noise fan driver for driving a single-coil brushless direct current (BLDC) fans and motors. The integrated output staged uses BTL technology to minimize the audible noise and OUT2 EMI generated by the motor commutation. The AM9789 is highly integrated and includes PWM speed control, standby mode, internally generated Hall bias and a Hall signal amplifier allowing it to be used 1 8 GND VCC 2 7 OUT1 HIN+ 3 6 PWM HIN- 4 5 FG with either a Hall element or a Hall Switch. OUT2 1 10 GND NC 2 9 OUT1 HIN+ 3 8 VCC HB 4 7 PWM HIN- 5 6 FG MSOP-8 (M8 Package) To help protect the motor coil the AM9789 includes rotor lock, over MSOP-10 (MM Package) current and over temperature protection which shuts down the output drive. The device automatically re-starts when the rotor lock is Pin 1 Mark Pin 1 Mark removed or the operating conditions return to normal. A Tachometer output is provided by open-drain Frequency Generator (FG) Pin which OUT2 1 8 GND OUT2 1 10 GND NC 2 9 OUT1 HIN+ 3 8 VCC PWM allows external interface to monitor motor rotation or speed. The FG VCC output is the magnetic change frequency. HIN+ 3 6 PWM HB 4 7 HIN- 4 5 FG HIN- 5 6 2 7 OUT1 FG The AM9789 is available in the MSOP-8, MSOP-10, U-DFN3030-8 and U-DFN3030-10 packages. U-DFN3030-8 (DN8 Package) Features U-DFN3030-10 (DN Package) Applications  BTL Output Single-phase Full-wave Linear Driver  Silent Driver  Low Supply Current (Normal Operation, Less than 4mA)  Low Standby Current (PWM=0 Duty) @ Supply Current Less  Silent Fan Motors than 200μA  Speed Controllable by PWM Input Signal  Built-in Quick Start Function  Built-in Lock Protection and Auto Restart Function  Built-in Hall Bias Circuit  Built-in FG Output  Built-in Thermal Shutdown Circuit  Built-in Over Current Protection Circuit  Totally Lead-free & Fully RoHS Compliant (Note 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 http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain