Diode introduces an enhanced version of our popular microphone drivers for small and portable devices

Jun 10 2020 2020-06 Power Diodes Incorporated

Diodes Incorporated announced an enhanced version of its popular sounder driver for small and portable devices. The PAM8904E delivers higher performance at lower voltages in a smaller package.

As a form of audio user interface, micro piezoelectric and ceramic sounders are now widely used in trackers, alarms, health monitors, security devices and smart sensors. The sounders are small and can be installed on portable and wearable devices, such as iot trackers, and can also enable tiny smart sensors to monitor the environment, including security detectors and water, smoke and carbon dioxide alarms. The PAM8904E microphone driver is designed to meet the requirements of the smallest applications operating at very low voltages.

The PAM8904E can support both single-ended and differential output modes with minimal external components. The device has a wide input voltage supply range of 1.5V to 5.5V and a shutdown current consumption of 1μa. The sounder also accepts input signals between 20Hz and 300kHz. Despite its small size, the PAM8904E incorporates a charge pump boost converter that operates in 1x, 2x and 3x modes. As a result, the PAM8904E is capable of producing a peak output voltage of up to 18V from a 3V supply voltage, or 27Vpp from a 4.5V supply.

The enhanced option can now drive sound loads up to 47nF, which is significantly higher than the drive capabilities of competing devices. Many competing devices typically drive only 15nF loads, requiring higher supply voltages. The PAM8904E also features thermal shut-off, overcurrent protection and short circuit protection, as well as automatic shutdown and wake up functions, which help to maximize the operating life of battery-powered devices.

The PAM8904EGPR is packaged in W-QFN020-12 Type A with dimensions of 2.00mm × 2.00mm width × 0.80mm height. Other packaging options include U-QFN3030-12 Type A (PAM8904EJPR) and U-QFN3030-16 (PAM8904EJER).

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