LT3640IUFD#TRPBF

Overview

The LT3640IUFD#TRPBF is a dual monolithic buck switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 4 V to 35 V and delivers up to 1.3 A output current per channel. The device features a fixed switching frequency of 2.5 MHz and maintains a quiescent current of 275 uA. It supports adjustable output voltages up to 33.97 V and functions within a temperature range of -40°C to +125°C. The component is housed in a 28-lead QFN package.

Feature Summary

• Integrates two independent synchronous buck regulators within a single compact package for space-constrained designs.
• Includes integrated power-on reset and watchdog timer circuits to ensure system reliability and fault monitoring.
• Supports high-frequency operation at 2.5 MHz to minimize external passive component size while maintaining efficiency.

Applications

• Portable electronic devices requiring multiple regulated voltage rails from a single battery source
• Industrial control systems needing robust power management with built-in fault protection
• Embedded computing platforms utilizing microprocessors or FPGAs with specific startup sequencing requirements

Procurement Notes

Verify the suffix #TRPBF indicates tape-and-reel packaging when ordering. Confirm the IUD variant meets the required industrial temperature specifications. Ensure compatibility with the target PCB footprint for the QFN-28 package. Cross-reference the manufacturer datasheet for latest revision details before finalizing procurement.

Selection Notes

Select this component when dual isolated buck outputs are required alongside system supervision features. The 2.5 MHz frequency allows for smaller inductors compared to lower-frequency alternatives. Verify that the 35 V maximum input voltage aligns with the system supply rails. Consider thermal performance in the QFN-28 package under maximum load conditions.

Part Context

This part belongs to the LT3640 series of dual buck regulators designed for applications requiring integrated supervision. It complements single-channel regulators by providing two independent outputs with shared control logic. The inclusion of reset and watchdog functions distinguishes it from basic DC/DC converters, offering enhanced system safety without additional discrete components.

FAQ

Does the LT3640 support independent shutdown control for each channel?

Yes, the device provides individual shutdown pins for each buck regulator, allowing independent control of the two channels.

What is the maximum adjustable output voltage for each regulator?

Each regulator can be adjusted to provide an output voltage up to 33.97 V, limited by the input voltage and internal circuitry constraints.