LT3688HFE#PBF

Overview

The LT3688HFE#PBF is a dual synchronous 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. The device provides two independent outputs, each capable of delivering up to 800 mA. It features a fixed switching frequency of 2.2 MHz and a typical quiescent current of 65 µA. Integrated functionalities include power-on reset timers and a watchdog timer. The component is housed in a TSSOP-EP-24 package and supports operation temperatures from -40 °C to +150 °C.

Feature Summary

• Dual output architecture providing independent regulation for two channels
• Integrated power-on reset timers and watchdog timer for system reliability
• High efficiency synchronous buck topology with internal power switches
• Wide input voltage range supporting transient voltages up to 60 V

Applications

• Industrial control systems requiring robust power management
• Portable instrumentation powered by single-cell lithium batteries
• Automotive electronics operating within wide voltage fluctuations
• Embedded systems utilizing microcontrollers needing stable dual rails

Procurement Notes

Verify the specific suffix against official Analog Devices documentation to confirm exact thermal and electrical specifications. Confirm RoHS compliance status through the manufacturer's datasheet. Ensure the TSSOP-EP-24 package matches your PCB footprint requirements. Cross-reference the part number with authorized distributors to validate authenticity and supply chain integrity before finalizing procurement orders.

Selection Notes

Select this component when dual isolated or non-isolated low-current rails are required from a high-voltage source. The integrated reset and watchdog features reduce external component count compared to standard regulators. Consider the 2.2 MHz frequency for smaller passive components. Verify that the 800 mA per channel limit meets the load requirements. Evaluate the TSSOP-EP-24 package for thermal dissipation needs in the target application environment.

Part Context

The LT3688 belongs to the LT3688 series of dual synchronous buck converters designed for high-efficiency applications. It complements other Analog Devices PMICs by offering integrated safety features like watchdogs. The device targets markets demanding compact solutions with high reliability. It serves as a power management solution for systems requiring multiple regulated outputs from a single input source.

Replacement Considerations

Consult Analog Devices technical support for verified cross-references. Ensure any substitute maintains the 36 V input rating and dual output capability. Verify pin compatibility with the TSSOP-EP-24 package if direct replacement is required.