PAM8907
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PAM8907 31VPP OUTPUT PIEZO SOUNDER DRIVER WITH BOOST CONVERTER ADVANCED INFORMATION The PAM8907 is a piezoelectric horn driver with built-in boost converter, capable of driving a ceramic/piezo sounder with up to 31VPP output. With integrated boost converter, the PAM8907 can provide an optimized solution with higher Sound Pressure Level (SPL) for louder output sound, lower quiescent current for longer standby time, and auto turn-on/off feature for extended operating lifetime. The PAM8907 provides clear benefits for battery-operated tracker, piezoelectric horn or alarm related applications. The PAM8907 integrates a boost converter that operates at a typical frequency of 1.8MHz. With integrated boost converter and unique piezo sounder driver technology, the PAM8907 provides small inrush current, low EMI and yet highly efficient system performance. PAM8907 Boost converter output can be set to either 11V or 15.6V with minimum external components for various application usages. The PAM8907 has built-in automatic shutdown and wake-up functions for longer operating lifetime requirement. It also features thermal shutdown protection, over-current protection, over-voltage protection and under-voltage-lockout protection to assure safe system operation. Bluetooth or Wireless Location Tracker Air Humidifier or Ultrasonic Related Piezo Driver Application Security Devices, Home Appliances Haptic Feedback Typical Applications Circuit 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 (Notes 1 & 2) Halogen and Antimony Free. “Green” Device (Note 3) For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/ Note: Schottky diode is optional. If added, it can save 20% of power consumption. 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds.

ADVANCED INFORMATION Switch Pin Connect with External Inductor Pin Boost Output Negative Output Positive Output PWM Signal Input, then End Signal Should be “L” to Disable the Chip TTL Low VOUT = 11V, TTL High VOUT = 15.6V Battery Voltage Input Functional Block Diagram BOOT Boost Converter REF VREF OSC UVLO Start/Stop Detect OUTP Level Shift Short Protection

PAM8907 Absolute Maximum Ratings (@ TA = +25° unless otherwise specified.) C, Symbol Supply Voltage High-Level Input Voltage Low-Level Input Voltage Operating Free-Air Temperature Range Operating Junction Temperature Range Storage Temperature Range ADVANCED INFORMATION Recommended Operating Conditions (@ TA = +25° unless otherwise specified.) C, Symbol Characteristics Supply Voltage High-Level Input Voltage Low-Level Input Voltage Operating Free-Air Temperature Thermal Information Symbol Thermal Resistance (Junction to Ambient) Thermal Resistance (Junction to Case) Electrical...

PAM8907 Performance Characteristics (VDD = 3V, fDIN = 3.2kHz, VSET = L/H, CLOAD = 15nF/33nF, unless otherwise specified.) 1. Turn-on waveform at VOUT = 11V Turn-on waveform at VOUT = 15.6V ADVANCED INFORMATION OUTN-OUTP OUTN-OUTP Turn-off waveform at VOUT = 11V Turn-off waveform at VOUT = 15.6V OUTN OUTP

PAM8907 Application Information Overview: The PAM8907 is a piezo sounder driver with integrated boost switch, power diodes, and fully differential amplifier. This versatile device is capable of driving piezo sounder for a variety of applications, including location tracker, air humidifier or haptic feedback related applications. The PAM8907 supports selectable boost voltage output by VSET pin for low/high voltage output. A typical start-up time of 1.1ms makes the PAM8907 an ideal piezo driver with fast response. PAM8907 has built-in thermal overload protection, current limit and various...

PAM8907 Application Information (continued) Boost Regulator The PAM8907 boost regulator is a conventional current-mode controller with the following enhanced features:  Under Voltage Lock Out (ULVO): When the input supply (VIN) drops below the UVLO value, the Boost regulator will switch off. Typical UVLO value is 1.6V  Over Temperature Protection (OTP): When PAM8907 die temperature is higher than OTP threshold, the Boost regulator will switch off, and ADVANCED INFORMATION restart after OTP condition is removed. Typical OTP value is set at +160° C.  VOUT Under Voltage (UV) Protection:...

PAM8907 Application Information (continued) Capacitor Selection Guide The external capacitors are required to use low ESR ceramic capacitors. It is strongly recommended to place them at the same layout layer as PAM8907.  Power Supply Decoupling – VIN (Pin 10) Capacitor Value: 1μF +10μF ADVANCED INFORMATION Voltage Rating: 2 x VIN Capacitor layout: place the 1μF capacitor close to VIN (Pin 10), and 10μF close to the inductor  External LDO – VCC (Pin 1) Capacitor Value: 1μF Voltage Rating: 10V or 16V Capacitor layout: place the capacitor close to VCC (Pin 1) Bootstrap – BOOT (Pin 3)...

PAM8907 Ordering Information PAM8907 XXXX - X Packing 7: 7'' Tape & Reel ADVANCED INFORMATION Marking Information ( Top View ) XX : Identification Code Y : Year : 0 to 9 W : Week : A to Z : 1 to 26 Week; a to z : 27 to 52 Week; z Represents 52 and 53 Week X : Internal Code Part Number Identification Code