LTC1143LCS-ADJ#TRPBF

Overview

The LTC1143LCS-ADJ#TRPBF is a dual step-down switching regulator controller from Analog Devices Inc., housed in a 16-pin SOIC package. It operates with an input voltage range of 3.5 V to 16 V and supports switching frequencies up to 400 kHz. The device utilizes a constant off-time current mode architecture to drive external power MOSFETs, featuring two independent regulator blocks. It includes automatic Burst Mode operation to maintain high efficiency at low output currents. The component is designed for applications requiring dual regulated outputs, such as 5V/2A and 3.3V/1A configurations, within an operating temperature range of 0°C to 70°C.

Feature Summary

• Dual independent regulator blocks using constant off-time current mode architecture
• Automatic Burst Mode operation for high efficiency at light loads
• Supports switching frequencies up to 400 kHz
• Wide input voltage range from 3.5 V to 16 V

Applications

• Dual-output DC-to-DC conversion systems
• Low dropout converter designs requiring high efficiency
• Portable electronics with multiple voltage rails
• Industrial control systems needing isolated regulation blocks

Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when ordering. Confirm that the ADJ variant allows for adjustable output voltages rather than fixed internal references. Ensure the 16-SOIC package dimensions match your PCB footprint requirements. Check RoHS compliance status if lead-free standards are mandatory for your assembly process. Validate supplier authorization to guarantee genuine Analog Devices components.

Selection Notes

Choose this controller when dual buck converters are needed in a single package to save board space. The current mode architecture provides fast transient response compared to voltage mode alternatives. Consider the 400 kHz maximum frequency for balancing component size and efficiency. The Burst Mode feature is critical for battery-powered applications where standby current must be minimized. Ensure external MOSFETs can handle the required current levels for both channels.

Part Context

This part belongs to the LTC1143 series of dual switching regulators. It is distinct from single-channel controllers by offering two separate regulation paths. The SOIC-16 package provides a compact solution for dense PCB layouts. It serves as a core component in power management IC families designed for versatile DC-DC conversion tasks.

Replacement Considerations

Direct substitutes include other dual buck controllers from Analog Devices with similar pinouts and electrical characteristics. Verify compatibility regarding input voltage ranges and switching frequency limits before substitution. Ensure the replacement part supports the same current mode control architecture for equivalent performance.

FAQ

Does the LTC1143LCS-ADJ support boost topology?

No, the LTC1143LCS-ADJ is specifically designed as a step-down (buck) switching regulator controller and does not support boost or buck-boost topologies.

What is the purpose of the Burst Mode operation?

Burst Mode operation maintains high efficiency at low output currents by skipping switching cycles, thereby reducing switching losses during light load conditions.