AH5794-WU-7

NOT RECOMMENDED FOR NEW DESIGN USE AH9485/AH9486 AH5794 SINGLE PHASE HALL EFFECT LATCH FAN MOTOR DRIVER Description Pin Assignments The AH5794 is a single chip solution for driving single-coil brushless direct current (BLDC) fans and motors. The integrated full-bridge driver output stage uses soft switching to minimize audible switching noise and electromagnetic interference (EMI) providing a low noise solution. (Top View) Low operating voltage down to 1.8V allows motor speed to be controlled by varying the supply voltage. FG 1 6 NC VSS 2 5 VDD O2 3 4 O1 To help protect the motor coil, the AH5794 provides Rotor Lock Protection which shuts down the output drive 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. TSOT26 (Top View) A Tachometer output is provided by open-drain Frequency Generator (FG) Pin which allows external interface to monitor motor rotation or speed. The FG output is the magnetic change frequency. NC 1 6 FG VDD 2 5 O2 O1 3 4 VSS The AH5794 is available in space saving and low profile TSOT26 and U-DFN2020C-6 packages. U-DFN2020C-6 Features  Supports Single-Coil Full-Wave BLDC Fan Drivers  Built-in Hall Sensor and Input Amplifier  Operating Voltage: 1.8V to 6V  VDD Voltage Speed Control  Soft Switching for Low Noise DC Fan Motor Applications  Rotor Lock Protection (Lock Detection, Output Shutdown and Automatic Re-Start) Applications  Thermal Protection  Tachometer (FG) Output  No External Timing Capacitor - Reduces the Numbers of External Components Required  Low Profile Package: TSOT26 and U-DFN2020C-6  Halogen and Antimony Free “Green” Packages  Lead Free Finish/ RoHS Compliant    Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/ Notes:  3V/ 3.3V/ 5V BLDC Cooling Fans  Netbook/ Notebook BLDC Fans  Instruments Cooling Fans  Low Voltage/ Low Power BLDC Motors 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See https://www.diodes.com/quality/lead-free/ 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