LT3688EFE#PBF

Overview

The LT3688EFE#PBF is a dual-channel monolithic step-down switching regulator manufactured by Analog Devices Inc. It operates with an input voltage range of 3.8 V to 36 V and withstands transients up to 60 V. Each channel provides an adjustable output voltage from 0.8 V to 32.4 V with a maximum output current of 800 mA. The device features a fixed switching frequency of 2.2 MHz and a typical quiescent current of 65 uA. It integrates two power-on reset timers with programmable delays and a watchdog timer for system protection. The component is housed in a 24-lead TSSOP package with an exposed pad and supports operation temperatures from -40°C to +125°C.

Feature Summary

• Integrates dual independent buck converters with dedicated power-on reset generators and a watchdog timer for enhanced system reliability.
• Supports high input voltages up to 36 V with robust transient immunity handling surges up to 60 V.
• Features low quiescent current consumption to maintain efficiency during standby or light-load conditions.

Applications

• Industrial control systems requiring isolated or multi-rail power distribution
• Automotive electronics operating within harsh electrical environments
• Embedded systems utilizing microcontrollers needing precise power sequencing

Procurement Notes

Verify the specific suffix against official Analog Devices documentation to confirm package type and temperature grade. Ensure compatibility with existing PCB footprints, as the EFE variant utilizes a TSSOP-EP-24 package distinct from other LT3688 options. Confirm RoHS compliance status through the manufacturer's latest material declaration before finalizing procurement orders.

Selection Notes

Select this component when designing circuits requiring dual regulated outputs from a single high-voltage source. The integrated reset and watchdog functions reduce external component count compared to discrete solutions. Consider the 2.2 MHz switching frequency for balancing electromagnetic interference with passive component size requirements.

Part Context

This part belongs to the LT3688 family of dual synchronous buck regulators designed for space-constrained applications. It shares functional similarities with other high-voltage buck controllers but distinguishes itself through integrated timing and reset logic. The series targets applications demanding reliable power management without complex external configuration networks.

Replacement Considerations

LT3688EUF#PBF offers identical electrical performance but utilizes a QFN-24 package instead of TSSOP-EP-24. Verify footprint compatibility before substitution. No direct pin-to-pin replacements with different topologies are officially documented for this specific form factor.