Datasheet PAM8907 (Diodes) - 5

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.
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Major functions of PAM8907 along with application information is described in the following sections.
IO LDO Regulator T A
The PAM8907 has a built-in 5V LDO regulator to supply 5V to the internal blocks. It is recommended to add 1μF capacitor at pin 1 VCC (LDO).
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VCC
R
LDO 1µF
O F IN Piezo Driver D E
As illustrated below, the PAM8907 has a built-in Piezo driver circuitry with Diodes Incorporated’s proprietary design. This is to enable easy system
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configuration for driving piezo sounder with less external components and yet optimized performance.
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Piezo Driver
V
IN OUTP
D A
OUTN
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. PAM8907 5 of 10 May 2021 Document number: DS43314 Rev. 2 - 2
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