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Selectable output Piezo sounder driver delivers higher SPL

Diodes has introduced the PAM8907, a piezoelectric sounder driver designed to maximize sound pressure level (SPL) delivery from a ceramic/piezo sounder.

The PAM8907 has a built-in synchronous boost converter, which extends SPL in battery-powered systems. The device has been optimised for use in wireless trackers, industrial alarm systems, medical equipment, and domestic appliances.

Supporting a wide 1.8V to 5.5V input voltage range it is able to address a broad variety of potential applications. A 22VPP or 31VPP output value can be selected (using the GPIO), thereby providing two different SPL options which allow optimised performance for SPL or battery runtime. Its integrated boost converter requires only a 1.0µH external inductor which helps reduce the bill-of-materials 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 1μA of current drawn in shutdown mode.

Thermal shutdown, overcurrent, and overvoltage protection, plus undervoltage lockout mechanisms, are included to ensure reliable operation.

The product operates across a -40°C to +125°C ambient temperature range.

Neil Tyler

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