LM1771UMM

DC DC Switching Controllers Overview

The LM1771UMM is a low-voltage synchronous buck controller manufactured by National Semiconductor. It operates within an input voltage range of 2.8V to 5.5V and provides a positive step-down DC-DC output. The device utilizes a fixed-frequency current-mode control architecture with a switching frequency range of 300 kHz to 1 MHz. It features a precision internal reference voltage of 0.6V for accurate output regulation. The controller is housed in an 8-pin VSSOP package, designed for compact power management applications requiring efficient voltage conversion.

DC DC Switching Controllers Feature Summary

• Synchronous buck topology integration for high efficiency
• Fixed-frequency current-mode control architecture
• Precision internal voltage reference for regulation accuracy

DC DC Switching Controllers Applications

• Portable electronic devices requiring low voltage regulation
• Battery-powered systems with single-cell lithium inputs
• Embedded power management modules

DC DC Switching Controllers Procurement Notes

Verify the manufacturer designation as National Semiconductor, now part of Texas Instruments, to ensure component authenticity. Confirm the specific suffix 'UMM' corresponds to the 8-VSSOP package variant. Cross-reference the datasheet revision to validate electrical specifications against your design requirements. Ensure compliance with RoHS standards if applicable to your assembly process.

DC DC Switching Controllers Selection Notes

Select this component when designing circuits that require a synchronous buck solution with an input voltage up to 5.5V. The fixed switching frequency simplifies filter design compared to variable frequency controllers. Consider the thermal performance of the VSSOP package for your expected load currents. Verify that the required output voltage falls within the adjustable range supported by the internal feedback network.

DC DC Switching Controllers Part Context

This component belongs to the LM177x family of low-voltage synchronous buck controllers. It shares architectural similarities with the LM1770 but differs in packaging and specific pinout configurations. The series is characterized by its ability to operate efficiently from single-cell lithium-ion or lithium-polymer battery sources, targeting mobile and handheld application segments.

DC DC Switching Controllers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.