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Piezo sounder driver helps maximize SPL

Diodes’ PAM8906, a driver IC with a built-in synchronous boost converter, is capable of driving a piezoelectric sounder with outputs up to 36 VPP. The driver maintains high sound pressure level (SPL) output, while an auto on/off function prolongs battery-powered operation.

For application flexibility, the PAM8906 operates with either an external pulse-wide modulation (PWM) input or in self-excitation mode. This allows it to be used with a variety of sounders in such devices as smoke alarms, air humidifiers, handheld GPS devices, security alarms, medical devices, and home appliances.

The driver provides a choice of three output voltage variants: 20 VPP, 24 VPP, and 36 VPP. Unlike charge pump-based alternatives, the PAM8906 maintains its output even as battery voltage drops over time. Using a small 0.47-µH inductor, the driver’s boost converter switches at a fixed frequency of 1.8 MHz, with quiescent current of just <1 µA.

The PAM8906 sounder driver comes in a 10-pin MSOP package and costs $0.37 each in lots of 1000 units.

PAM8906 product page


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