LT3640EFE

Overview

The LT3640EFE is a dual monolithic buck regulator featuring integrated power-on reset and watchdog timer functions. It operates with an input voltage range of 4 V to 35 V, delivering up to 1.3 A output current per channel. The device utilizes a fixed 2.5 MHz switching frequency and maintains a typical quiescent current of 275 uA. It supports shutdown mode for power management and is housed in a TSSOP-EP-28 package suitable for surface mount applications.

Feature Summary

• Dual synchronous buck converters integrated into a single compact package
• Built-in power-on reset generator and programmable watchdog timer
• Fixed high-frequency operation enabling small external component size
• Low quiescent current consumption for efficient standby modes

Applications

• Portable battery-powered equipment requiring multiple regulated rails
• Industrial control systems needing reliable power sequencing
• Embedded computing platforms with strict reset timing requirements
• Telecommunications infrastructure power distribution modules

Procurement Notes

Verify the specific suffix designation against official Analog Devices documentation to confirm pinout compatibility and thermal performance characteristics. Ensure that the procurement source provides valid RoHS compliance certificates matching the PBF designation. Cross-reference the manufacturing date code with current lifecycle status reports to avoid obsolete stock acquisition.

Selection Notes

Select this component when a design requires two independent step-down converters alongside system supervision features within a limited board area. Evaluate the thermal dissipation capabilities of the TSSOP-EP-28 package against the expected load conditions. Confirm that the required reset delay and watchdog timeout intervals align with the internal configuration options provided by the manufacturer.

Part Context

This part belongs to the LT3640 series of mixed-signal power management ICs designed for space-constrained applications. It integrates analog power stages with digital supervision logic, distinguishing it from standard standalone regulators. The series targets markets demanding high reliability and simplified bill-of-materials through functional consolidation.

Replacement Considerations

Consult official cross-reference guides for direct pin-compatible alternatives. Verify that any substitute maintains identical reset threshold voltages and watchdog functionality. Ensure thermal resistance values are comparable to prevent overheating in existing PCB layouts.