MAS6240

www.DataSheet4U.com DA6240.001 20 November 2006 MAS6240 Piezo Driver with Multi-Mode Charge Pump This is preliminary information on a new product under development. Micro Analog Systems Oy reserves the right to make any changes without notice. Both Single Ended and Differential Output Three-Step Volume Adjusting Up to 18Vpp Output from 3V Supply One Wire Audio & Shutdown Control High Efficiency Solution without Inductors Low External Part Count Control logic is switching the charge pump on at first rising signal of digital input (DIN) pin. The switch-off signal will be generated while the signal at DIN has been low at least for 10ms. The piezo driver is enabled at a second rising edge of a pulse at DIN and the signal is transferred to piezo output VO1. The same signal is inverted into output VO2 for using differential output. Continuous logic high level at DIN input causes the charge pump to be turned ON but leaves the audio amplifier disabled. In that state the charge pump output can be used to power the external LEDs or any other external circuit. The output voltage is still selectable at three steps. In "disabled" mode (DIN has been low for 10ms) all functional blocks are switched off to achieve the quiescent current less than 1µA. See more information in the chapter Detailed Description. DESCRIPTION MAS6240 is a piezo driver device that can drive outputs up to 18Vpp from 3V supply. An internal three-mode charge pump generates boosted supply voltage for p...