LM3477MMX/NOPB

DC DC Switching Controllers Overview

The LM3477MMX/NOPB is a high-side N-channel MOSFET switching regulator controller manufactured by Texas Instruments. It operates with a supply voltage range of 2.97V to 35V and features a fixed switching frequency of 500 kHz. The device supports a maximum duty cycle of 93% and delivers an output current capability of 6A. It is housed in an MSOP-8 package and functions within a temperature range of -40°C to +125°C. The component consumes a typical operating supply current of 2 mA.

DC DC Switching Controllers Feature Summary

• High-side N-channel MOSFET control for buck, inverting, and flyback topologies
• Integrated bootstrap diode eliminates external component requirements
• Fixed 500 kHz switching frequency reduces passive component size
• Internal soft-start limits inrush current during startup

DC DC Switching Controllers Applications

• Buck converter designs requiring high-side drive
• Inverting power supply architectures
• Flyback converter implementations
• Point-of-load regulation modules

DC DC Switching Controllers Procurement Notes

Verify the manufacturer designation as Texas Instruments, as National Semiconductor was acquired. Confirm the suffix NOPB indicates lead-free and RoHS compliance. Ensure the MMX variant matches the required MSOP-8 package type. Cross-reference the specific ordering number against official TI documentation to avoid counterfeit components.

DC DC Switching Controllers Selection Notes

Select this controller when a high-side N-channel topology is preferred over low-side P-channel solutions. The fixed 500 kHz frequency suits applications needing compact magnetics. Verify that the input voltage stays within the 2.97V to 35V range. Consider the 6A output current limit relative to the target load requirements.

DC DC Switching Controllers Part Context

This component belongs to the LM3477 family of switching controllers. It serves as a driver for external high-side N-channel MOSFETs. The device integrates essential protection features and timing circuits. It replaces older discrete gate driver solutions in modern power management designs.

DC DC Switching Controllers Replacement Considerations

The LM3477AMMX/NOPB is a documented substitute part number within the same series. Both variants share similar functional characteristics and pinouts. Verify package compatibility between MMX and AMMX designations before substitution.