Summary of SELECTABLE OUTPUT PIEZO SOUNDER DRIVER FROM DIODES INCORPORATED DRIVES HIGHER SPL AND LONGER RUNTIMES
Diodes Incorporated’s PAM8907 is a piezoelectric sounder driver with a built-in synchronous boost converter that maximizes SPL for ceramic/piezo sounders in battery-powered systems. It supports 1.8–5.5 V input, selectable 22 VPP or 31 VPP outputs via GPIO, requires only a 1.0 µH external inductor, and includes automatic shutdown/wake-up, low shutdown current (<1 μA), thermal/overcurrent/overvoltage protections, and operation from –40 °C to +125 °C. It targets wireless trackers, alarms, medical devices, and appliances, and comes in a space-saving U-QFN2020-10 package.
Parts used in the PAM8907 piezoelectric sounder driver project:
- PAM8907 piezoelectric sounder driver IC
- 1.0 µH external inductor
- Piezo/ceramic sounder
- Power source (1.8 V to 5.5 V supply/battery)
- GPIO control signal
- Decoupling and filter capacitors (implied for boost converter) <li PCB (with U-QFN2020-10 footprint)
Diodes Incorporated introduces the PAM8907 piezoelectric sounder driver, for maximizing sound pressure level (SPL) delivery from a ceramic/piezo sounder. The PAM8907 has a built-in synchronous boost converter, which extends SPL in battery-powered systems and outperforms other similar sounder drivers. The device is optimized for use in wireless trackers, industrial alarm systems, medical equipment, and domestic appliances.
The wide 1.8 V to 5.5 V input voltage range supported by the PAM8907 sounder driver enables it to address a broad variety of potential applications. A 22 VPP or 31 VPP output value can be selected (using the GPIO), thereby providing two different SPL options which allow optimized performance for SPL or battery runtime. Its integrated boost converter requires only a 1.0 µH external inductor which helps reduce the bill-of-materials costs and board space.
Features
- Supply Voltage Range from 1.8V to 5.5V
- Intergraded Boost Converter VOUT = 11V or 15.6V
- Drive Piezo Sounder with up to 31VPP
- High-Speed Driver Designed with Very Short Turn-On/Turn-Off
- No Voltage Cross Output at Shutdown Mode
- High Impendence Output at Shutdown Mode
- Low Current Consumption, with Shutdown Current < 1μA
- Automatic Shutdown and Wake-Up Control
- Available in Space-Saving U-QFN2020-10 package
- Totally Lead-Free & Fully RoHS Compliant
- Halogen and Antimony Free. “Green” Device
Automatic shutdown and wake-up functions help to further extend the PAM8907 sounder driver’s runtime when incorporated into battery-powered systems, with less than 1 μA of current drawn in shutdown mode. Thermal shutdown, overcurrent, and overvoltage protection, plus undervoltage lockout mechanisms, are included to ensure reliable operation. The product operates across a –40 °C to +125 °C ambient temperature range.
- What input voltage range does the PAM8907 support?
The PAM8907 supports an input voltage range from 1.8 V to 5.5 V. - Can the PAM8907 provide different SPL output levels?
Yes, it can select between 22 VPP or 31 VPP outputs using the GPIO to provide two SPL options. - What external inductor value is required for the PAM8907?
The integrated boost converter requires only a 1.0 µH external inductor. - Does the PAM8907 support low-power shutdown?
Yes, it has automatic shutdown and wake-up functions and draws less than 1 μA in shutdown mode. - What protection features are included with the PAM8907?
It includes thermal shutdown, overcurrent, overvoltage protection, and undervoltage lockout. - What ambient temperature range can the PAM8907 operate in?
The device operates across a –40 °C to +125 °C ambient temperature range. - Is the PAM8907 available in a small package?
Yes, it is available in a space-saving U-QFN2020-10 package. - What applications is the PAM8907 optimized for?
It is optimized for wireless trackers, industrial alarm systems, medical equipment, and domestic appliances.
