LTC3805IDD-5#TRPBF

DC DC Switching Controllers Overview

The LTC3805IDD-5#TRPBF is an adjustable frequency current mode DC/DC controller designed for flyback, boost, and SEPIC converter applications. It drives N-channel MOSFETs with programmable operating frequency and slope compensation via external resistors. The device features programmable overcurrent sensing for protection against overload and short-circuit conditions. Soft-start is configured using an external capacitor, which also enables an automatic restart feature. It offers ±1.5% output voltage accuracy and consumes 360μA quiescent current during normal operation, reducing to 40μA during micropower startup. Powered by a 9.5V internal shunt regulator, it supports high VIN input or direct low impedance DC power from 4.7V to 8.8V. The component is housed in a 10-lead MSOP package.

DC DC Switching Controllers Feature Summary

• Supports flyback, boost, and SEPIC topologies with N-channel MOSFET drive
• Adjustable switching frequency and slope compensation via external components
• Integrated programmable overcurrent sensing for fault protection
• External soft-start capacitor provides automatic restart functionality

DC DC Switching Controllers Applications

• Flyback converter designs
• Boost converter architectures
• SEPIC (Single Ended Primary Inductor Converter) systems

DC DC Switching Controllers Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when sourcing. Confirm the IDD grade temperature range matches application requirements. Cross-reference the manufacturer datasheet for pinout and electrical characteristics. Ensure compatibility with N-channel MOSFET drivers. Validate supply chain authenticity through authorized channels.

DC DC Switching Controllers Selection Notes

Select this controller for non-isolated power supplies requiring flexible topology support. Consider the adjustable frequency range for EMI optimization. Evaluate the quiescent current specifications for efficiency requirements. Check the input voltage range compatibility with the system power source. Assess thermal performance within the MSOP package constraints.

DC DC Switching Controllers Part Context

This part belongs to the LTC3805 series of DC/DC controllers from Analog Devices. It is distinct from integrated switch regulators as it requires external MOSFETs. The family includes variants with different packages and temperature grades. The -5 suffix typically denotes specific output voltage configurations or factory settings in related parts, though this controller is primarily defined by its control logic.

DC DC Switching Controllers Replacement Considerations

Direct substitutes include other LTC3805 variants such as LTC3805HMSE#PBF or LTC3805IMSE#PBF, depending on package and temperature grade requirements. Verify pin compatibility and electrical parameter overlaps before substitution.