DESCRIPTION
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 5nF to 300nF. 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, combine to allow the wide output voltage range needed to drive a piezoceramic microactuator.

FEATURES
Amplifier
■ Current Limit: ±40mA Typical
■ Input Common Mode Range: 0V to 10V
■ Output Voltage Range: 1V to (VCC – 1V)
■ Differential Gain Stage with High Impedance Output
(gm Stage)
■ Quiescent Current (from VCC): 2mA
■ Unloaded Gain: 30,000 Typical

Switching Regulator
■ Generates VCC Up to 35V
■ Wide Operating Supply Range: 2.5V to 16V
■ High Switching Frequency: 1.3MHz
■ Internal Schottky Diode
■ Tiny External Components
■ Current Mode Switcher with Internal Compensation
■ Low Profile (1mm) SOT-23 Package

APPLICATIONS
■ Piezo Speakers
■ Piezo Microactuators
■ Varactor Bias