LM25575MH

Voltage Regulators - DC DC Switching Regulators Overview

The LM25575MH is a synchronous step-down switching regulator manufactured by Texas Instruments, formerly National Semiconductor. It operates with an input voltage range of 6 V to 42 V and delivers up to 1.5 A of output current. The device features an adjustable switching frequency from 50 kHz to 1 MHz, allowing for optimization of external component size and efficiency. It utilizes current-mode control with pulse width modulation (PWM) and includes integrated power MOSFETs. The controller supports buck, inverting, and SEPIC topologies. It is housed in a 16-pin HTSSOP package with exposed pad for thermal dissipation.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated synchronous rectification with internal high-side and low-side power MOSFETs
• Adjustable switching frequency ranging from 50 kHz to 1 MHz
• Current-mode control architecture for fast transient response
• Supports multiple converter topologies including buck, inverting, and SEPIC

Voltage Regulators - DC DC Switching Regulators Applications

• Industrial point-of-load regulation
• Automotive electronics systems
• Distributed power architectures
• Inverting and negative voltage generation circuits

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer designation carefully, as Texas Instruments acquired National Semiconductor. Confirm the specific suffix indicates the standard commercial grade variant rather than the automotive qualified QMH version. Ensure the package matches the 16-lead HTSSOP specification with the required thermal pad configuration for proper heat dissipation during operation.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing non-isolated DC-DC converters requiring flexible topology options beyond simple step-down configurations. The wide input voltage range suits 12 V and 24 V bus systems. Consider the thermal performance requirements of the HTSSOP package relative to the expected load current and ambient temperature conditions.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2557x family of synchronous buck controllers. It shares functional similarities with the LM2575 series but offers higher integration through internal MOSFETs and broader topology support. The LM25575MH serves as a modern replacement for older discrete solutions or simpler regulators like the LM2575, providing improved efficiency and design flexibility for complex power management needs.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct pin-compatible alternatives within the same family include the LM25575QMH for automotive applications. For general replacements, verify compatibility with the LM25576 if higher current capacity is needed, though pinouts may differ.