LTC3704IMS

DC DC Switching Controllers Overview

The LTC3704IMS is a single-ended current mode DC/DC controller IC optimized for negative output converter applications. It features a dedicated Negative Feedback (NFB) pin, allowing direct connection to ground-referenced voltage dividers without level-shifting circuitry. The device utilizes proprietary No R(SENSE) technology to sense power MOSFET voltage, enhancing efficiency and reducing component count. Operating frequencies are programmable from 50kHz to 1MHz via an external resistor on the FREQ pin, with synchronization capability through the MODE/SYNC pin. It supports input voltages from 2.5V to 36V and operates within a junction temperature range of -40°C to 125°C.

DC DC Switching Controllers Feature Summary

• Dedicated NFB pin enables direct feedback connection for negative output topologies
• No R(SENSE) technology eliminates current sense resistors to improve efficiency
• Programmable switching frequency from 50kHz to 1MHz with external clock sync support

DC DC Switching Controllers Applications

• RF power supplies requiring negative voltage rails
• FPGA board auxiliary power generation
• High-efficiency inverting DC/DC converters

DC DC Switching Controllers Procurement Notes

Verify the suffix #PBF indicates lead-free compliance and RoHS adherence when sourcing. Confirm the IMS package designation corresponds to the 10-MSOP form factor. Ensure the specific lot date code aligns with project requirements. Cross-reference the manufacturer part number against authorized distributor catalogs to guarantee authenticity. Validate that the ordering information matches the exact electrical specifications required for the target application design.

DC DC Switching Controllers Selection Notes

Select this controller for designs requiring high-efficiency negative voltage generation without current sense resistors. It is suitable for applications needing flexible input ranges up to 36V. Consider the 10-MSOP package for space-constrained layouts. Evaluate the need for external synchronization if multiple converters operate in proximity. Verify that the chosen power MOSFETs are compatible with the No R(SENSE) sensing method or add sense resistors if higher precision is needed.

DC DC Switching Controllers Part Context

The LTC3704 belongs to Analog Devices' portfolio of specialized DC/DC controllers designed for non-standard topologies. Unlike standard positive-output controllers, it addresses the specific challenges of generating negative voltages efficiently. It integrates seamlessly with Linear Technology's proprietary sensing technologies to minimize passive component counts. This series targets industrial and communication equipment requiring reliable auxiliary power rails.

DC DC Switching Controllers Replacement Considerations

Direct substitutes may include other Analog Devices negative-output controllers such as the LTC3705, though pinout and feature sets must be verified. Check datasheets for compatibility with the 10-MSOP package and similar operating voltage ranges. Ensure replacement parts support the required switching frequency range and synchronization capabilities.