LM2677S-3.3/NOPB

$3.66

Description：IC REG BUCK 3.3V 5A TO263
Series：SIMPLE SWITCHER®
Mfr：National Semiconductor
Package：Bulk

SKU:1a3d922b419e Category: Voltage Regulators - DC DC Switching Regulators Brand: National Semiconductor

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Product introduction

LM2677S-3.3/NOPB is listed in the Voltage Regulators - DC DC Switching Regulators range at ChipApex. The manufacturer field lists National Semiconductor. Its product description is IC REG BUCK 3.3V 5A TO263. Review the specifications below when checking this part for your BOM.

Voltage Regulators - DC DC Switching Regulators specifications for LM2677S-3.3/NOPB

Description：IC REG BUCK 3.3V 5A TO263
Series：SIMPLE SWITCHER®
Mfr：National Semiconductor
Package：Bulk
Function：Step-Down
Output Configuration：Positive
Topology：Buck
Output Type：Fixed
Number of Outputs：1
Voltage - Input (Min)：8V
Voltage - Input (Max)：40V
Voltage - Output (Min/Fixed)：3.3V
Voltage - Output (Max)：-
Current - Output：5A
Frequency - Switching：260kHz
Synchronous Rectifier：No
Operating Temperature：-40°C ~ 125°C (TJ)
Mounting Type：Surface Mount
Package / Case：TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
Supplier Device Package：TO-263 (DDPAK-7)
Grade：-
Qualification：-

Voltage Regulators - DC DC Switching Regulators datasheet and documents for LM2677S-3.3/NOPB

LM2677S-3.3/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2677S-3.3/NOPB is a SIMPLE SWITCHER high-efficiency 5A step-down voltage regulator manufactured by Texas Instruments, originating from the National Semiconductor portfolio. It operates as a synchronous buck converter with a fixed 3.3V output and supports an input voltage range of 4.5V to 40V. The device integrates a 5A internal switch and maintains a switching frequency of 260kHz. It features a TO-263-7 package for surface mount installation and ensures reliable operation across a temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

Integrates a 5A synchronous power switch for high efficiency
Fixed 3.3V output configuration eliminates external feedback resistors
Operates at a constant 260kHz switching frequency
Includes thermal shutdown and current limit protection

Voltage Regulators - DC DC Switching Regulators Applications

Point-of-load regulation for embedded systems
Power supplies for industrial equipment
Distribution power conversion in telecom infrastructure

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer designation on the datasheet, as the component is currently produced by Texas Instruments following their acquisition of National Semiconductor. Confirm the suffix NOPB indicates lead-free and RoHS compliance. Ensure the specific fixed 3.3V variant is selected rather than adjustable or other voltage versions within the LM2677 family.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this part when a fixed 3.3V output is required with up to 5A load capability. The synchronous design offers superior efficiency compared to non-synchronous alternatives. Consider the TO-263-7 package for adequate thermal dissipation without requiring extensive heatsinking in moderate duty cycle applications.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the LM2677 series of SIMPLE SWITCHER regulators. It shares architectural similarities with the LM2678 but provides higher current capacity. The device represents a transition from discrete solutions to integrated monolithic regulators, simplifying board layout and reducing component count for standard voltage rails.