LT3469 Datasheet | Linear Technology

LT3469 Piezo Microactuator Driver with Boost Regulator Features Amplifier s Current Limit: ± 40m A Typical s Input mon Mode Range: 0V to 10V s Output Voltage Range: 1V to (V CC - 1V) s Differential Gain Stage with High Impedance Output (gm Stage) s Quiescent Current (from V ): 2m A CC s Unloaded Gain: 30,000 Typical Switching Regulator Generates VCC Up to 35V s Wide Operating Supply Range: 2.5V to 16V s High Switching Frequency: 1.3MHz s Internal Schottky Diode s Tiny External ponents s Current Mode Switcher with Internal pensation s Low Profile (1mm) SOT-23 Package s DESCRIPTIO The LT®3469 is a transconductance (gm) amplifier that can drive outputs up to 33V from a 5V or 12V supply. An internal switching regulator generates a boosted supply voltage for the gm amplifier. The amplifier can drive capacitive loads in the range of 5n F to 300n F. Slew rate is limited only by the maximum output current. The 35V output voltage capability of the switching regulator, along with the high supply voltage of the amplifier, bine to allow the wide output voltage range needed to drive a piezoceramic microactuator. The LT3469 switching regulator switches at 1.3MHz, allowing the use of tiny external ponents. The output capacitor can be as small as 0.22µF, saving space and cost versus alternative solutions. The LT3469 is available in a low profile Thin SOTTM package. , LTC and LT are registered trademarks of Linear Technology Corporation. Thin SOT is a trademark of Linear Technology Corporation. U APPLICATIO S s s s Piezo Speakers Piezo Microactuators Varactor Bias TYPICAL APPLICATIO 47µH 5V OR 12V 1µF 16V 3 VIN Piezo Microactuator Driver Response Driving a 33n F Load VCC FB LT3469 GND 9.09k 7 8 10k 100k 4 1 VOUT 1V TO 33V PIEZO ACTUATOR 5n F < C < 300n F 3469 TA03 5 SW 6 453k 2 16.5k 0.47µF 50V IOUT 100m A/DIV VOUT 10V/DIV + INPUT 0V TO 3V +IN - IN + - OUT INPUT 5V/DIV 50µs/DIV 3469 TA04 - U 3469f ABSOLUTE (Note 1) AXI...