LTC1149CS-3.3#PBF

DC DC Switching Controllers Overview

The LTC1149CS-3.3#PBF is a quad step-down switching regulator controller manufactured by Analog Devices Inc., housed in a 16-lead SOIC package. It integrates four independent buck converters capable of delivering up to 1.1A per channel, with a combined output current limit of 2.5A across all channels. The device operates from an input voltage range of 3V to 42V and provides a fixed 3.3V output. Key electrical specifications include a switching frequency of 400kHz, ultralow EMI performance through spread spectrum modulation, and gangable outputs for parallel operation.

DC DC Switching Controllers Feature Summary

• Integrates four independent high-efficiency buck regulators within a single compact package
• Features ultralow electromagnetic interference (EMI) performance via spread spectrum modulation technology
• Supports gangable outputs allowing multiple channels to be paralleled for increased current capacity
• Includes integrated soft-start functionality to manage inrush current during startup

DC DC Switching Controllers Applications

• Industrial control systems requiring multiple isolated or non-isolated low-voltage rails
• Telecommunications infrastructure equipment needing efficient power distribution
• Automotive electronics applications utilizing wide input voltage ranges
• Embedded systems with space-constrained PCB layouts requiring multi-rail regulation

DC DC Switching Controllers Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and RoHS adherence before procurement. Confirm the 16-lead SOIC narrow package dimensions match your PCB footprint requirements. Ensure the 400kHz switching frequency aligns with your system's noise sensitivity and component selection. Validate that the 42V maximum input voltage exceeds your highest expected supply rail under all operating conditions.

DC DC Switching Controllers Selection Notes

Select this component when designing systems requiring four distinct regulated outputs from a single controller IC. It is suitable for applications where board space is limited but multiple voltage rails are necessary. Consider the 1.1A per-channel capability against total load requirements, noting the 2.5A aggregate limit. Evaluate the need for spread spectrum EMI reduction if the design operates in sensitive RF environments.

DC DC Switching Controllers Part Context

This part belongs to the LTC1149 family of quad step-down regulators designed for high-density power management solutions. It serves as a consolidated alternative to using four separate single-channel controllers, reducing component count and assembly complexity. The series is targeted at industrial and automotive markets where reliability and efficiency are critical.

DC DC Switching Controllers Replacement Considerations

Direct substitutes may include other quad buck controllers from Analog Devices such as the LTC3850 series, though pinouts and control interfaces differ. Verify compatibility with existing gate drive requirements and feedback network configurations when considering cross-family replacements.