LT3694IFE#TRPBF

Overview

The LT3694IFE#TRPBF is a monolithic buck regulator with dual low-dropout linear regulators (LDOs) manufactured by Analog Devices Inc. It operates within an input voltage range of 4 V to 36 V and delivers up to 2.6 A from the primary buck output. The adjustable buck output voltage spans from 750 mV to 16 V, while the two integrated LDOs provide fixed outputs at 3.3 V and 5 V. The device supports switching frequencies between 250 kHz and 2.5 MHz and maintains a quiescent current of 1 mA. It is housed in a thermally enhanced TSSOP-EP-20 package and functions reliably across an operating temperature range of -40°C to +125°C.

Feature Summary

• Integrates a high-current synchronous buck converter with two independent low-dropout linear regulators on a single chip
• Features programmable switching frequency allowing optimization for efficiency or external component size
• Includes internal soft-start circuitry to limit inrush current during power-up sequences
• Provides thermal shutdown protection to safeguard the device under excessive heat conditions

Applications

• Portable electronic devices requiring multiple regulated voltage rails from a single battery source
• Industrial control systems needing robust power management in harsh thermal environments
• Embedded computing platforms utilizing mixed-signal architectures with digital and analog supply requirements

Procurement Notes

Verify the specific suffix against official documentation to confirm pin compatibility and electrical characteristics. Confirm availability status as distribution channels may list limited stock or end-of-life statuses. Ensure the selected package variant matches the intended PCB footprint and thermal design requirements for the target application.

Selection Notes

Select this component when a compact solution combining high-current buck regulation with auxiliary low-noise LDO supplies is required. Evaluate the total available current budget to ensure the combined load does not exceed the thermal limits of the TSSOP-EP-20 package. Consider the minimum input voltage requirement relative to the battery or supply rail used in the system design.

Part Context

This part belongs to the LT3694 family of mixed-mode power management ICs designed for space-constrained applications. It consolidates three distinct regulation functions into one small outline package, reducing the overall bill of materials and board area compared to discrete solutions. The series targets designs where both high efficiency and low noise are critical performance factors.

Replacement Considerations

LT3694EUFD#PBF serves as a parameter-equivalent alternative within the same product family.