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MAS6251 数据表(PDF) 1 Page - Micro Analog systems |
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MAS6251 数据表(HTML) 1 Page - Micro Analog systems |
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1 / 21 page  DA6251.002 27 October, 2017 1 (21) MAS6251 Piezo and LED Driver with Synchronous Boost DC/DC Converter • Both Single Ended and Differential Output • Up to 35Vpp Output from min 1.2V Supply • Self-Drive for 3-Terminal Piezo • LED Driver • High Efficiency • External Schottky Diode Not Needed • Small 0806 Size 2.2H Inductor DESCRIPTION MAS6251 is a piezo and LED driver device that can drive piezo outputs up to 35Vpp and sink up to 15mA LED current using wide range of supply voltage 1.2V…5.5V. An internal high efficiency DC/DC boost converter with adjustable output voltage generates up to 17.5V supply voltage for the piezo driver. Internal over voltage protection (OVP) allows also operating without external feedback resistors and when connecting FB feedback pin to GND. This configuration reduces external part count further and provides highest output voltage 17.5V typically. MAS6251 uses synchronous type boost DC/DC converter which makes external Schottky diode unnecessary. Thus MAS6251 is a low part count and low-cost solution for a high sound pressure piezo driver. Two piezo driver outputs (VOB, VOS) allow driving piezo in both single-ended and differential bridge-tied load (BTL) configurations. MAS6251 supports self- drive of a 3-terminal piezo. The piezo driver is activated by setting DIN pin to logic high (DIN>0.9V). When disabled (logic low DIN<0.4V) the piezo driver outputs (VOB, VOS) are pulled actively to ground (GND). MAS6251 has ILED pin for sinking up to 15mA current from series connected LEDs. The current sink is enabled by setting CTRL pin to logic high (CTRL>0.9V) which can be also controlled by PWM signal in LED dimming purposes. The DC/DC converter is turned on if either one of DIN or CTRL is at logic high (>0.9V). The boost DC/DC converter and piezo driver disable signal (shutdown mode) will be generated while the signal at DIN and CTRL has been at low mostly for 15ms. MAS6251 is available in a small 3x3x0.75 mm QFN-16 package. FEATURES APPLICATIONS • Thin 3x3x0.75 mm QFN-16 package • Wide Supply Voltage Range 1.2V…5.5V • Both Single Ended and Differential Output • Self-Drive for 3-Terminal Piezo • Up to 15mA LED Driver • External Schottky Diode Not Needed • Small 0806 Size 2.2H Inductor • Low External Part Count • Over Voltage Protection (OVP) • Piezo Buzzers • Smoke Alarms • White Goods • Alarm Clocks • Handheld GPS devices • Portable Devices with Sound Feature |
类似零件编号 - MAS6251 |
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类似说明 - MAS6251 |
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