LT1765EFE-1.8#PBF

Overview

The LT1765EFE-1.8#PBF is a monolithic buck switching regulator manufactured by Analog Devices Inc., housed in a 16-TSSOP package with an exposed pad. It provides a fixed 1.8V output at up to 3A load current, operating from a 3V to 25V input range. The device integrates a 3A power switch and operates at a 1.25MHz switching frequency. Key electrical parameters include a 15µA quiescent current, 1mA operating supply current, and a shutdown feature. It supports an adjustable feedback voltage of 1.2V and functions within a temperature range of -40°C to +125°C.

Feature Summary

• Integrates a high-current 3A internal power switch for efficient step-down conversion
• Utilizes a 1.25MHz fixed switching frequency to minimize external passive component size
• Features low quiescent current operation to enhance efficiency in battery-powered applications
• Includes a dedicated shutdown pin for precise power management control

Applications

• Negative dc/dc converters using positive-buck topologies
• General-purpose 12V-input to lower-voltage-output DC/DC converters
• Portable equipment requiring compact power solutions
• Battery-powered systems needing extended runtime

Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and RoHS adherence before procurement. Confirm the 16-TSSOP-EP package availability matches your PCB footprint requirements. Ensure the fixed 1.8V output variant aligns with your system voltage rails, as other fixed voltages exist within the LT1765 family. Cross-reference the manufacturer's latest datasheet for any recent packaging or marking changes.

Selection Notes

Select this part when a fixed 1.8V output is required without external resistor dividers. The 3A current capability suits moderate-load applications where synchronous rectification is not mandatory. Consider the 1.25MHz frequency trade-off between component size and EMI. Verify thermal performance in the 16-TSSOP package under maximum load conditions, as heat dissipation relies on the exposed pad connection.

Part Context

This component belongs to the LT1765 series of high-efficiency monolithic buck regulators. It shares architectural similarities with the LT1765EFE#PBF but differs in having a fixed 1.8V output instead of an adjustable one. The series is designed for space-constrained designs, offering a balance of high current density and low standby power consumption compared to older generation regulators.

Replacement Considerations

LT1765EFE#PBF (Adjustable version)

FAQ

Is the LT1765EFE-1.8#PBF a synchronous rectifier?

No, the LT1765EFE-1.8#PBF is a non-synchronous buck converter that uses an internal NPN power switch.

What is the minimum input voltage for this regulator?

The minimum operating input voltage is 3V.