Released Diodes, a piezoelectric buzzer driving IC for GPS trackers - Products & Services: Nikkei Crosstech Active

　American Diodes released a news release on the release of a driver IC for a piezoelectric buzzer (piezoelectric sounder) that can select the sound pressure level (SPL). The sound pressure level can be selected by changing the voltage applied to the piezoelectric buzzer. When the applied voltage is 31V_PP, a high sound pressure level can be obtained, but the battery life is shortened. On the other hand, if the applied voltage is 22V_PP, the sound pressure level will be lower, but the battery life will be extended. Applications include GPS trackers, Bluetooth trackers, portable medical humidifiers, and industrial alarms.

Piezoelectric buzzer driver IC for GPS trackers (source: Diodes) [Click image to enlarge]

22V_{PP by integrating a step-up (boost) DC-DC converter circuit It enabled high applied voltage such as 31VPP. The switching element and diode are integrated, and the only external component required is an inductor of 1.0μH. As a result, "BOM cost and printed circuit board mounting surface area can be reduced," according to the company.}

Application circuit example of new product (Source: Diodes) [Click image to enlarge]

　The model number of the new product is "PAM8907". The input voltage range from the battery is +1.8 to 5.5V. The voltage applied to the piezoelectric buzzer is selected by the user through a general purpose input/output (GPIO). A function that automatically shifts to shutdown mode when the PWM signal input (DIN pin input) continues to be low (low) for 100 ms (typical value) or more, and automatically starts (wakes) when it changes to high (high) again up). "By using these functions, you can extend the battery life" (the company). Current consumption in shutdown mode is as low as 1μA maximum. Protective functions include thermal shutdown, overcurrent protection, and overvoltage protection.

　The package is a 10-terminal DFN with a small mounting area of ​​2.0mm x 2.0mm. The operating temperature range is -40 to +125°C. We have already started selling. The reference unit price when purchasing 3000 pieces is US$0.43.