CP1 CN2 VO1 NC CP1 CN2 VO1 EN 1 EN2 DIN EN 1 EN2 DIN NC PAM8904 18VPP OUTPUT PIEZO SOUNDER DRIVER Description Pin Assignments The PAM8904 is a piezo sounder driver with integrated charge pump (Top View) boost converter. The PAM8904 is capable of driving a ceramic/piezo NC VIN CP2 VOUT sounder with 24V from a 5.5V power supply. The charge pump can PP Pin 1 operate in either 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 Incorporateds unique drive technology provides a small inrush current, low EMI and high efficiency. CN1 GND VO2 NC The PAM8904 includes built-in automatic shutdown and wake up that guarantees longer battery life. The PAM8904 features thermal U-QFN3030-16 (Type B) shutdown, over current protection, over voltage protection and under voltage lock-out. (Top View) The PAM8904 is available in a 16-pin U-QFN3030-16 (Type B) VIN CP2 VOUT Pin 1 package, or 12-pin U-QFN3030-12 (Type A) package. Features Supply Voltage Range from 2.3V to 5.5V 18V Output from a 3V Supply PP Integrated Boost Converter Generates up to 12V Supply Input Signal 20Hz to 300kHz No Voltage Cross Output at Shutdown Mode CN1 GND VO2 Low Current Consumption U-QFN3030-12 (Type A) Automatic Standby and Wake-up Control Available in Space Saving Packages 16 Pin U-QFN3030-16 (Type B) or 12 Pin U-QFN3030-12 (Type A) Package Applications Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Health Care Systems Halogen and Antimony Free. Green Device (Note 3) Alarm Clocks For automotive applications requiring specific change Security Devices control (i.e. parts qualified to AEC-Q100/101/200, PPAP Home Appliances capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. PAM8904 Typical Applications Circuit C1=1F C2=1F CP1 CN1 CP2 CN2 VIN VOUT C =2.2F Charge Pump IN Oscillator (1x / 2x / 3x) C =2.2F OUT EN1 Control Short Circuit Logic Protection EN2 DET VO1 DIN Piezo Level shift sounder GND VO2 Pin Descriptions Pin Number Pin Name I/O/P Function U-QFN3030-16 U-QFN3030-12 (Type B) (Type A) 1 1 EN1 I Charge pump mode select 1 2 2 EN2 I Charge pump mode select 2 3 3 DIN I Signal Input 4 NC No Connection 5 4 CN1 I Capacitor 1 Negative Terminal 6 5 GND P Ground 7 6 VO2 O Positive Output 8 NC No Connection 9 7 VO1 O Negative Output 10 8 CN2 I Capacitor 2 Negative Terminal 11 9 CP1 I Capacitor 1 Positive Terminal 12 NC No Connection 13 10 VOUT O Boost Output 14 11 CP2 I Capacitor 2 Positive Terminal 15 12 VIN P Power Supply 16 NC No Connection 2 of 9 PAM8904 March 2020 Diodes Incorporated www.diodes.com Document number: DS37246 Rev. 3 - 2