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LT3469 - Piezo Microactuator Driver with Boost Regulator

Datasheet

Documentation

Features

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

Description

The LT3469 is a transconductance (g_m) 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 g_m 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.

Packaging

SOT-23

Order Info

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)^*
LT3469ETS8#PBF	SOT	8	E	$2.45
LT3469ETS8#TRMPBF	SOT	8	E	$2.45	$1.73
LT3469ETS8#TRPBF	SOT	8	E	$2.45	$1.71
LT3469ETS8	SOT	8	E	$4.90
LT3469ETS8#TR	SOT	8	E	$4.90	$3.42
LT3469ETS8#TRM	SOT	8	E	$4.90	$3.46

^* 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	Design File Manual Schematic