Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details. U-QFN3030-12 (Type A)

Image shown is for reference only. Actual package may vary. Refer to the product data sheet for package details. U-QFN3030-16 (Type B)

U-QFN2020-12 (Type UX)

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PAM8904

18VPP Piezo Sounder Driver

Datasheet

Evaluation Boards and User Guides

PAM8904-User-Guide.pdf (194 KB)

Contact Sales

Description

The PAM8904 is a piezo sounder driver with integrated charge pump boost converter. The PAM8904 is capable of driving a ceramic/piezo sounder with 24VPP from a 5.5V power supply. The charge pump can operate in a 1x, 2x, or 3x mode.

The boost converter operates at a fixed frequency of 1.0MHz and provides a 12V output with a minimum number of external components. The PAM8904 can drive up to 15nF loading. Diodes Incorporated’s unique drive technology provides a small inrush current, low EMI and high efficiency.

The PAM8904 includes built-in automatic shutdown and wake up that guarantees longer battery life. The PAM8904 features thermal shutdown, overcurrent protection, overvoltage protection and undervoltage lock-out.

The PAM8904 is available in a 16-pin U-QFN3030-16 (Type B) package, a 12-pin U-QFN3030-12 (Type A) package, or a 12-pin UQFN2020-12 (Type UX) package.

Feature(s)

Supply Voltage Range from 1.8V to 5.5V
18V_PP Output from a 3V Supply
Integrated Boost Converter Generates Up to 12V Supply
No Voltage Cross Output at Shutdown Mode
Low Current Consumption
Automatic Standby and Wake-Up Control
Available in Space-Saving Packages:
- 16-Pin U-QFN3030-16 (Type B)
- 12-Pin U-QFN3030-12 (Type A)
- 12-Pin U-QFN2020-12 (Type UX)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
An Automotive-Compliant Part is Available Under Separate Datasheet (PAM8904Q)

Application(s)

Health care systems
Alarm clocks
Security devices
Home appliances

Specifications & Technical Documents

Product Parameters

IQ(mA)	<1uA
Compliance (Only Automotive Supports PPAP)	Standard
AEC Qualified	No
Input Type	PWM In
Category	Piezo Driver
Minimum V_DD (V)	2.3
Maximum V_DD (V)	5.5
Boost Type	charge pump
Maximum Output (Vpp)	18
Mono or Stereo	Mono
Control Interface	GPIO
Special Features	Auto wake-up and standby with one GPIO control

Technical Documents

Evaluation Boards and User Guides

PAM8904-User-Guide.pdf (194 KB)

Recommended Soldering Techniques

TN1.pdf

Purchase & Availability

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Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN #	Issue Date	Implementation Date	Subject
PCN-2770	2025-10-30	2025-10-30	Add Fab Site Code, Country of Diffusion (COD) and Assembly Site Origin (ASO) on Product and Shipping Labels for all Diodes Products