PAM8907

Document number: DS43314 Rev. 2 - 2

5 of 10

www.diodes.com

May 2021

© Diodes Incorporated

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 protection features to prevent

the device from damage when overdriven.

Major functions of PAM8907 along with application information is described in the following sections.

LDO Regulator

The PAM8907 has a built-in 5V LDO regulator to supply 5V to the internal blocks. It is recommended to add 1

μF capacitor at pin 1 VCC (LDO).

VCC

LDO

1

Piezo Driver

As illustrated below, the PAM8907 has a built-in Piezo driver circuitry with Diodes I

ncorporated’s proprietary design. This is to enable easy system

configuration for driving piezo sounder with less external components and yet optimized performance.

OUTP

OUTN

IN

Piezo Driver

DIN Control

The PAM8907 designs a binary control logic circuit internally for the automatic shutdown and wake-up control, when DIN is set low and continue

for longer than 100ms (Typ.) period, PAM8907

’s boost and Piezo driver block will be disabled and the device automatically enters shutdown mode.

The PAM8907

’s operation current is less than 1μA under this shutdown mode. When DIN is set high or provided with pulsed-clock input,

PAM8907

’s boost and Piezo driver block will be enabled again & resumed back to normal operation mode.