The AH5798 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.
To help protect the motor coil, the AH5798 provides Rotor Lock Protection which shuts down 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.
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.
Supports single-coil full-wave DC fan driversBuilt-in Hall sensor and input amplifierOperating Voltage: 1.8V to 5.5VSoft switching for low noise DC fan motor applicationsRotor Lock Protection (Lock detection, output shutdown and automatic re-start)Thermal protectionTachometer (FG) outputNo external timing capacitor - Reduces the numbers of external components requiredLow profile packages: SOT89-5L and TSOT25“Green” Molding Compound
3.3V / 5V Min. BLDC Cooling FansNetbook/ Notebook BLDC fansLow Voltage/ Low Power BLDC Motors