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MAS6250 数据表(PDF) 1 Page - Micro Analog systems |
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MAS6250 数据表(HTML) 1 Page - Micro Analog systems |
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1 / 24 page  DA6250.007 13 April, 2018 1 (24) MAS6250 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 • External Drive and Self-Drive Audio Frequency Control for 2-Terminal Piezo • LED Driver • High Efficiency • External Schottky Diode Not Needed • Small 0806 Size 2.2H Inductor DESCRIPTION MAS6250 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. MAS6250 uses synchronous type boost DC/DC converter which makes external Schottky diode unnecessary. Thus MAS6250 is a low part count and low-cost solution for a high sound pressure piezo driver. Two piezo driver outputs (VOP, VON) allow driving piezo in both single-ended and differential bridge-tied load (BTL) configurations. MAS6250 supports external drive and self-drive modes for a 2-terminal piezo. In external drive mode (ROSC=VIN) an external audio frequency is fed directly to digital audio input pin (DIN) allowing external system to drive desired frequency tones to the piezo. The first rising edge of DIN pin only turns on the DC/DC boost converter but the piezo outputs are still kept disabled. When disabled the piezo driver outputs (VOP, VON) are pulled actively to GND. Continuous logic high level at DIN inputs keeps DC/DC converter on and allows using MAS6250 as DC/DC power supply which is controlled from DIN pin. At the second rising edge of DIN pin the piezo driver outputs are activated and DIN signal is transferred to the piezo output VOP. The same signal is inverted into output VON for using differential output. 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. In self-drive mode the audio frequency is produced from precise internal oscillator which is adjustable by just one external resistor. Self-drive mode is selected by connecting frequency adjustment resistor from ROSC pin to GND. In self-drive mode the DIN pin is used to control internal oscillator on (DIN=HIGH) and off (DIN=LOW) and the oscillator signal is transferred to the piezo outputs. MAS6250 has ILED pin for sinking up to 15mA current from series connected LEDs. The current sink is enabled by CTRL pin 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 high. MAS6250 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 • External Drive and Self-Drive Modes • 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 • Sport Watches • Smoke Alarms • White Goods • Alarm Clocks • Handheld GPS devices • Portable Devices with Sound Feature |
类似零件编号 - MAS6250 |
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类似说明 - MAS6250 |
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