Piezo Sounder Driver Ups The Volume With Lower Currents

Thanks to its multimode charge-pump boost converter, Diodes Inc.’s PAM8904 will drive piezoelectric sounders at up to 18 V p-p from a 3-V power supply.
June 10, 2014

Thanks to its multimode charge-pump boost converter, Diodes Inc.’s PAM8904 will drive piezoelectric sounders at up to 18 V p-p from a 3-V power supply. By increasing the volume at a lower operating current within a 20-Hz to 300-kHz input signal range, the piezo sounder driver will suit battery-powered applications such as medical systems, alarm clocks, and security devices. The device operates from a 2.3- to 5.5-V supply at a 1-MHz fixed frequency. Thus, it will drive a sounder load of up to 15 nF, providing a 9-V output. The PAM8904 operates in 1x, 2x, and 3x modes, giving designers three different piezo sound-pressure level possibilities. A built-in automatic shutdown and wakeup function helps minimize current consumption and extend battery life. Quiescent current is less than 1 µA in shutdown mode. Protection includes thermal shutdown, overcurrent, overvoltage, and undervoltage lockout. The driver comes in U-QFN3030 packaging.

DIODES INC.

About the Author

Staff

Articles, galleries, and recent work by members of Electronic Design's editorial staff.

Sign up for Electronic Design Newsletters
Get the latest news and updates.

Voice Your Opinion!

To join the conversation, and become an exclusive member of Electronic Design, create an account today!