LT3640IUFD#PBF

$10.16

Description：IC REG BUCK ADJ 1.1A/1.3A 28QFN
Series：-
Mfr：Analog Devices Inc.
Package：Tube

SKU:fd3639347f7c Category: Voltage Regulators - DC DC Switching Regulators Brand: Analog Devices Inc.

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Product introduction

Product Detailed Parameters

Description：IC REG BUCK ADJ 1.1A/1.3A 28QFN
Series：-
Mfr：Analog Devices Inc.
Package：Tube
Function：Step-Down
Output Configuration：Positive
Topology：Buck
Output Type：Adjustable
Number of Outputs：2
Voltage - Input (Min)：2.5V
Voltage - Input (Max)：35V
Voltage - Output (Min/Fixed)：0.6V, 1.265V
Voltage - Output (Max)：33.97V
Current - Output：1.1A, 1.3A
Frequency - Switching：500kHz ~ 2MHz
Synchronous Rectifier：No
Operating Temperature：-40°C ~ 125°C (TJ)
Mounting Type：Surface Mount
Package / Case：28-WFQFN Exposed Pad
Supplier Device Package：28-QFN (4x5)
Grade：-
Qualification：-

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LT3640IUFD#PBF

Overview

The LT3640IUFD#PBF is a dual monolithic buck regulator from Analog Devices, housed in a 28-lead QFN package. 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 2.5 MHz switching frequency and includes integrated power-on reset and watchdog timer functions. Quiescent current is specified at 275 uA, supporting efficient operation across a temperature range of -40°C to +125°C.

Feature Summary

Integrates two independent synchronous buck converters within a single compact package for space-constrained designs.
Includes built-in power-on reset generator and watchdog timer circuitry to enhance system reliability and fault monitoring.
Supports high-frequency operation at 2.5 MHz to minimize external passive component size while maintaining stable regulation.

Applications

Industrial control systems requiring isolated or multi-rail power distribution
Embedded computing platforms needing reliable startup sequencing and fault protection
Telecommunications infrastructure utilizing dense power management solutions

Procurement Notes

Verify the complete part number including suffixes such as #PBF for lead-free compliance when ordering. Confirm package type is QFN-28 and ensure thermal pad connectivity matches your PCB layout requirements. Cross-reference datasheet revision dates to guarantee compatibility with existing design specifications and regulatory standards.

Selection Notes

Select this component when dual low-voltage buck conversion is required alongside integrated system supervision features. The 2.5 MHz frequency allows for smaller inductors compared to lower-frequency alternatives. Ensure input voltage does not exceed 35 V and verify that load currents remain within the 1.3 A limit per channel for optimal thermal performance.

Part Context

This device belongs to the LT3640 series of dual buck regulators designed for applications demanding high integration and robust fault management. It serves as a power management solution where board space is limited and system uptime is critical due to its embedded reset and watchdog capabilities.