LM5642MTCX

Overview

The LM5642MTCX is a high-voltage, dual synchronous buck converter controller manufactured by Texas Instruments. It features two independent output channels capable of delivering up to 20 A each. The device operates with a fixed switching frequency of 200 kHz and supports oscillator synchronization for phase alignment. It accepts input voltages from 4.5 V to 36 V and provides adjustable output voltages ranging from 1.236 V to 34 V. Integrated control features include current mode operation, soft start, and enable functionality. The component is housed in a 28-pin TSSOP package and is rated for an operating temperature range of -40°C to +125°C.

Feature Summary

• Dual-channel architecture supporting independent synchronous buck conversion paths
• Oscillator synchronization capability for precise multi-phase alignment
• Integrated current-mode control with built-in soft start and enable logic

Applications

• Industrial power distribution systems requiring multiple voltage rails
• Automotive electronics power management modules
• Telecommunications infrastructure equipment
• Server and data center point-of-load regulation

Procurement Notes

Verify the specific suffix 'MTCX' against official Texas Instruments documentation to confirm tape-and-reel packaging and exact pinout configuration. Ensure compatibility with existing PCB footprints for the 28-TSSOP package. Cross-reference humidity sensitivity levels and reflow soldering profiles prior to assembly integration.

Selection Notes

Select this component when designing high-current dual-rail systems requiring synchronized switching frequencies. It is suitable for applications demanding wide input voltage ranges and robust thermal performance. Consider the 200 kHz fixed frequency trade-off between component size and efficiency. Evaluate the need for external synchronization signals if phase shifting is required for EMI reduction.

Part Context

The LM5642MTCX belongs to the LM5642 family of high-voltage dual synchronous buck controllers. This series is designed for demanding industrial and automotive environments. The device integrates high-side and low-side gate drivers for external MOSFETs. It represents a solution for compact, efficient power conversion in space-constrained designs.

Replacement Considerations

LM5642XMT/NOPB: Pin-compatible alternative with different switching frequency characteristics.

FAQ

What is the maximum continuous output current per channel?

Each channel supports a maximum output current of 20 A.

Does the device support external clock synchronization?

Yes, the LM5642MTCX includes an oscillator synchronization input for aligning with other converters.