LT3469 - Piezo Microactuator Driver with Boost Regulator


  • 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

Typical Application

LT3469 Typical Application
LT3469 Typical Application


The LT3469 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.

The LT3469 switching regulator switches at 1.3MHz, allowing the use of tiny external components. 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 ThinSOT package.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LT3469ETS8#PBF SOT-23 TS8 E 05-08-1637 Yes
LT3469ETS8#TRMPBF SOT-23 TS8 E 05-08-1637 Yes
LT3469ETS8#TRPBF SOT-23 TS8 E 05-08-1637 Yes

LT3469 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LT3469ETS8#PBF SOT-23 E $2.45 Yes
LT3469ETS8#TRMPBF SOT-23 E $2.45 $1.73 Yes
LT3469ETS8#TRPBF SOT-23 E $2.45 $1.71 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC630A LT3469ETS8 | Piezoceramic Microactuator Driver with Boost Regulator, Input+, 0V to 3V, Vin = 5V or 12V, Vout = 1V to 33V $75.00
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Click here to view our complete list of demo boards


  • Piezo Speakers
  • Piezo Microactuators
  • Varactor Bias

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