LTC1143CS#PBF

Overview

The LTC1143CS#PBF is a dual step-down switching regulator controller from Analog Devices, housed in a 16-pin SOIC-N package. It features two independent regulator blocks utilizing constant off-time current mode architecture to drive external power MOSFETs at switching frequencies up to 400kHz. The device supports an input voltage range of 4V to 14V and provides outputs of 5V at 2A and 3.3V at 1A. It incorporates automatic Burst Mode operation for high efficiency at low output currents and includes current limit and enable control features.

Feature Summary

• Dual independent regulator blocks with constant off-time current mode architecture
• Automatic Burst Mode operation for maintaining high efficiency at low load currents
• Supports driving external power MOSFETs at switching frequencies up to 400kHz
• Integrated current limit and enable control functions

Applications

• Low dropout dual converter systems requiring 5V/2A and 3.3V/1A rails
• Battery-powered applications benefiting from low quiescent current operation
• Embedded systems requiring efficient DC-DC conversion with external power stages

Procurement Notes

Verify the specific suffix (CS vs TR) against the required packaging format, as the CS variant typically denotes tube packaging while TR indicates tape and reel. Confirm the operating temperature range requirements match the commercial grade specifications. Ensure the design accommodates the necessary external components for the 400kHz switching frequency and current mode control loop stability.

Selection Notes

Select this component when a dual-channel buck controller with integrated Burst Mode efficiency optimization is required. It is suitable for designs needing separate regulation for different voltage rails without using multiple single-channel controllers. Consider the external MOSFET selection carefully to support the 400kHz frequency and specified output currents efficiently.

Part Context

This part belongs to the LTC1143 series of dual step-down switching regulator controllers. It shares architectural similarities with other members like the LTC1142 but offers higher output current capabilities and a 400kHz switching frequency. The series is designed for applications requiring compact, high-efficiency power solutions with minimal component count.

Replacement Considerations

The LTC1142CG#PBF is a related dual synchronous buck regulator but operates at 250kHz with lower output current ratings. Verify if the reduced switching frequency and current capacity meet the application requirements before substitution.