MAS6251 is a combined piezo and LED driver IC in a small QFN-16 3x3x0.75 mm package. The heart of the IC is a high efficiency synchronous boost DC/DC converter requiring only a small 0806 sized 2.2μH inductor. The DC/DC converter offers regulated output which is adjustable up to 17.5V in a very wide supply voltage range from 1.2V to 5.5V.
The piezo driver has bridge-tied load (BTL) output stage which is capable of producing very high sound pressure level (SPL) audio by driving up to 35Vpp signal. The piezo driver is designed for three terminal self drive type piezoelectric transducers which produce very loud sound at resonance frequency of the piezo.
The LED driver supports use of pulse-width modulation (PWM) dimming control and is capable of driving up to 15mA current. The LED current is adjustable by external resistor. When not used the device enters shut down operating mode (typ 0.11μA) to save power.