Selectable output piezo sounder driver maximises sound pressure level
Sound pressure level (SPL) from a ceramic / piezo sounder can be maximised using the PAM8907 piezoelectric sounder driver. The driver has a built-in synchronous boost converter, which extends SPL in battery-powered systems and outperforms other similar sounder drivers, says Diodes.
The driver has a wide input voltage range (1.8 to 5.5V) and a 22VPP or 31VPP output value can be selected (using the general purpose I/O), providing two SPL options to optimise performance for SPL or battery runtime. The driver also has an integrated boost converter which requires only a 1.0 microH external inductor which helps reduce the bill of materials (BoM) costs and board space.
Automatic shutdown and wake-up functions help to further extend the PAM8907 sounder driver’s runtime when incorporated into battery-powered systems, with less than 1.0 microA of current drawn in shutdown mode. Thermal shutdown, over-current, and over-voltage protection, plus under-voltage lockout mechanisms, are also included. The PAM8907 operates across a -40 to +125 degrees C ambient temperature range.
The piezoelectric sounder driver is supplied in a compact 10-pin U-QFN2020 package.
Suitable applications are wireless trackers, industrial alarm systems, medical equipment and domestic appliances.
Diodes delivers semiconductor products to the companies in the consumer electronics, computing, communications, industrial, and automotive markets. Its expanded product portfolio includes discrete, analogue and mixed-signal products and packaging technology. The company has operations around the world with 31 sites, including engineering, testing, manufacturing, and customer service.
