LMS36555QRNLTQ1

Voltage Regulators - DC DC Switching Regulators Overview

The LMS36555QRNLTQ1 is a synchronous step-down DC-DC converter from Texas Instruments, designed for automotive and industrial applications. It features an input voltage range of 3.9 V to 36 V and delivers a fixed 5 V output at up to 5.5 A. The device operates with a switching frequency of 400 kHz and includes integrated soft-start and power-good monitoring. It is housed in a 22-pin VQFN-HR package and meets AEC-Q100 qualification standards.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated power-good indicator with open-drain output eliminates the need for external supervisory circuitry.
• Seamless transition between PWM and PFM modes ensures high efficiency across varying load conditions.
• Exceptional dropout performance allows operation without boost stages during start-stop cycles.

Voltage Regulators - DC DC Switching Regulators Applications

• Automotive electronic systems requiring robust power management
• Industrial equipment needing wide input voltage tolerance
• Systems utilizing 36 V input architectures

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the part number suffix matches the required output configuration and package type. Confirm AEC-Q100 compliance if automotive qualification is mandatory. Check datasheet specifications for thermal requirements and ensure proper PCB layout for the VQFN-HR package to maintain performance integrity.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 5 V output is required with high current capability. Consider the 400 kHz switching frequency for balancing size and efficiency. Ensure the application environment supports the specified operating temperature range and input voltage profile.

Voltage Regulators - DC DC Switching Regulators Part Context

This model belongs to the LMS3655x-Q1 series, which shares architectural similarities with the LMS3635x-Q1 family. While both utilize similar evaluation boards, the LMS36555 variant is distinguished by its higher continuous load capacity of 5.5 A compared to the 3.5 A limit of the LMS3635 series.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LMS36555QRNLQ1 (non-automotive grade equivalent)

Voltage Regulators - DC DC Switching Regulators FAQ

Does the LMS36555QRNLTQ1 require external feedback resistors?

No, it provides a fixed 5 V output, eliminating the need for external feedback resistor networks.

What is the purpose of the open-drain RESET output?

It provides a true indication of system status, negating the requirement for additional supervisory circuitry.