Piezo sounder driver
16 July 2014
Analogue, Mixed Signal, LSI
Integrating a multi-mode charge pump boost converter, the PAM8904 from Diodes Incorporated drives piezoelectric sounders at up to 18 Vpp from a 3 V power supply. Bringing higher volume at a lower operating current and with a wide input signal range of 20 Hz to 300 kHz, the device will suit a variety of battery-powered applications, including medical systems, alarm clocks and security devices. Operating from a 2,3 V to 5,5 V supply at a fixed frequency of 1 MHz, the IC will drive a sounder load of up to 15 nF, providing a 9 V output and a minimal component footprint. Able to operate in 1x, 2x and 3x modes, the charge pump enables designers to select from three different piezo sound pressure levels.
Avnet Kopp, +27 (0)11 319 8600, [email protected], www.avnet.co.za
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