LT3688HFE

Overview

The LT3688HFE#PBF is a dual synchronous step-down switching regulator manufactured by Analog Devices Inc. It features two independent buck converters, each capable of delivering up to 800 mA of output current. The device operates with an input voltage range from 3.8 V to 36 V and withstands transient voltages up to 60 V. Key electrical parameters include a maximum output voltage of 32.4 V per channel, a typical quiescent current of 65 µA, and a fixed switching frequency of 2.2 MHz. It is housed in a TSSOP-EP-24 package and supports an operating temperature range from -40°C to +150°C.

Feature Summary

• Dual independent 800mA synchronous buck channels for flexible power distribution
• Integrated power-on reset timers and watchdog timer for system reliability
• High efficiency operation with low quiescent current consumption
• Robust input voltage handling with 60V transient tolerance

Applications

• Industrial control systems requiring dual regulated rails
• Automotive electronics with high transient voltage environments
• Portable instrumentation powered by single-cell lithium batteries
• Embedded systems needing reliable power-on reset sequences

Procurement Notes

Verify the exact ordering suffix #PBF to confirm lead-free compliance and tube packaging format. Confirm that the TSSOP-EP-24 package matches your PCB footprint requirements. Ensure the design accounts for the 60V transient capability if used in automotive or industrial environments. Check thermal dissipation needs given the 150°C maximum junction temperature rating.

Selection Notes

Select this component when dual isolated outputs are required from a wide input voltage range. The integrated reset and watchdog functions simplify board layout compared to discrete solutions. Consider the 2.2MHz switching frequency for smaller passive component sizes. Evaluate the 65µA quiescent current against standby power requirements for battery-operated applications.

Part Context

The LT3688 belongs to Analog Devices' family of high-voltage synchronous buck regulators. It complements other devices like the LT3690 by offering dual-channel functionality rather than single high-current outputs. The HFE suffix indicates a specific temperature grade and package variant within the broader LT3688 product line designed for demanding operational environments.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing designs before considering alternative components from the same manufacturer or competitors.