Sounder driver shrinks audio user interface, says Diodes

An enhanced version of Diodes sounder driver, the PAM8904E, is designed for small and portable devices. It delivers higher performance at a lower voltage in a smaller package, says Diodes.

Miniature piezo and ceramic sounders are used extensively in trackers, alarms, health monitors, security devices, and smart sensors as an audio user interface. They are small in size to fit into portable and wearable devices, such as IoT-enabled trackers and miniature smart sensors that monitor the environment, for example, security detectors and water, smoke, and CO2 alarms. The PAM8904E sounder driver is designed to meet the requirements of the smallest application operating from extremely low voltages.

It can support both single-ended and differential output modes with minimal external components. It has a wide-input voltage supply range between 1.5 and 5.5V and a shutdown current consumption within one microA. The sounder also accepts an input signal between 20Hz to 300kHz and integrates a charge-pump boost converter that operates in 1x, 2x, and 3x modes. The PAM8904E is able to generate an output voltage up to 18V peak to peak from a 3V supply voltage or 27V peak to peak from a 4.5V supply.

The enhanced sounder can drive a load up to 47nF, which is significantly higher than the drive capability of competing devices, points out Diodes, which can typically only drive a load of 15nF and require a higher supply voltage. The PAM8904E also features thermal shutdown, over-current protection, and short-circuit protection as well as an automatic shutdown and wake function to help maximise the operational lifetime of battery-powered devices.

The PAM8904EGPR is available in the W-QFN2020-12 Type A package, which measures 2.0 x 2.0mm wide and 0.8mm high. Other packaging options include U-QFN3030-12 Type A (PAM8904EJPR) and U-QFN3030-16 (PAM8904EJER).

Diodes manufactures and supplies application specific standard products within the broad discrete, logic, analogue and mixed-signal semiconductor sectors and for the consumer electronics, computing, communications, industrial, and automotive markets.

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