LT3469ETS8#TRPBF

Overview

The LT3469ETS8#TRPBF is a transconductance amplifier with an integrated boost switching regulator, designed to drive piezoelectric actuators and speakers. It operates from a 2.5V to 16V input supply and generates an internal VCC up to 35V. The gm amplifier provides a typical unloaded gain of 30,000 and drives capacitive loads between 5nF and 300nF. Key electrical parameters include a 1.3MHz switching frequency, 2mA quiescent current, and a maximum output current of -40mA typical. The device supports an input common mode range of 0V to 10V and outputs voltages from 1V to (VCC – 1V).

Feature Summary

• Integrates a high-frequency switching regulator to generate boosted supply voltage for the amplifier.
• Features a differential gain stage with high impedance output suitable for driving capacitive loads.
• Includes an internal Schottky diode and current mode control for efficient operation.
• Provides wide input common mode range extending from ground to 10V.

Applications

• Piezo microactuator drivers
• Piezo speaker amplifiers
• Varactor bias circuits

Procurement Notes

Verify the specific suffix TRPBF indicates tape and reel packaging when sourcing components. Confirm that the E-grade designation ensures performance specifications across the full operating temperature range of –40°C to 85°C. Ensure compatibility with the TSOT-23-8 package dimensions during PCB layout planning.

Selection Notes

Select this component for applications requiring high voltage swing from low input supplies. The internal boost converter eliminates external high-voltage generation requirements. Consider the 1.3MHz switching frequency for minimizing passive component size. Verify that the load capacitance falls within the stable operating range of 5nF to 300nF for proper phase margin.

Part Context

This part belongs to the LT3469 family of piezo drivers. It combines a linear transconductance amplifier with a DC-DC converter in a single low-profile package. The design targets portable devices where space constraints limit the use of discrete boost regulators and separate amplifiers.

Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation.