LT3640EFE#PBF

Overview

The LT3640EFE#PBF is a dual monolithic buck switching regulator manufactured by Analog Devices Inc. It operates within 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 maintains a typical quiescent current of 275 uA. It provides two independent outputs with integrated power-on reset and watchdog timer functions. The component is housed in a 28-lead TSSOP-EP package and supports operation temperatures from -40°C to +125°C.

Feature Summary

• Dual synchronous buck regulators providing independent power rails
• Integrated power-on reset generator and watchdog timer for system monitoring
• Fixed high-frequency switching operation to minimize external component size

Applications

• Portable electronic devices requiring multiple regulated voltage rails
• Industrial control systems needing reliable power management
• Automotive infotainment and instrumentation modules

Procurement Notes

Verify the specific suffix #PBF indicates lead-free RoHS compliance when sourcing. Confirm the TSSOP-EP package variant matches your PCB footprint requirements. Check official Analog Devices documentation for any recent manufacturing changes or pinout updates before finalizing procurement specifications.

Selection Notes

Select this component when dual isolated buck outputs are required from a single input source. The fixed 2.5 MHz frequency suits designs prioritizing compact passive components over variable frequency flexibility. Ensure the 1.3 A per-channel current rating meets the peak load demands of both downstream circuits without exceeding thermal limits.

Part Context

This part belongs to the LT3640 family of dual buck regulators designed for space-constrained applications. It integrates control logic, drivers, and protection features into a single compact package. The series targets applications requiring synchronized multi-rail power distribution with minimal external bill of materials.

Replacement Considerations

Consult official Analog Devices substitution guides for verified equivalents. Cross-reference pinouts and electrical characteristics carefully. Do not assume functional compatibility with other dual buck regulators without validating control interfaces and timing parameters.