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Product Detailed Parameters
- Description：IC REG BUCK 3.3V 5A TO263
- Series：SIMPLE SWITCHER®
- Mfr：Texas Instruments
- Package：Tape & Reel (TR)
- 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：-
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Overview
The LM2677SX-3.3/NOPB is a SIMPLE SWITCHER high-efficiency 5A step-down voltage regulator from Texas Instruments. It operates with an input voltage range of 8V to 40V and provides a fixed 3.3V output at up to 5A. The device features a 260kHz switching frequency, integrated low ON-resistance DMOS power switch, and operates within a temperature range of -40°C to +125°C. It utilizes a TO-263-7 (D2PAK) package for surface mount installation.
Feature Summary
- Integrated synchronous rectification using internal low ON-resistance DMOS switches for high efficiency
- Fixed 3.3V output option eliminates external feedback resistor requirements
- Built-in thermal shutdown and current limit protection for robust operation
Applications
- Point-of-load regulation in industrial control systems
- Power supplies for embedded computing platforms
- Battery-powered equipment requiring efficient step-down conversion
Procurement Notes
Verify the suffix 'SX' indicates tape-and-reel packaging versus 'S' tube packaging. Confirm 'NOPB' denotes lead-free and RoHS compliance. Ensure the specific distributor listing matches the exact part number including all suffixes to avoid functional or packaging discrepancies.
Selection Notes
Select this fixed-output variant when a stable 3.3V rail is required without external resistor networks. Compare against the adjustable LM2677SX-ADJ if variable output is needed. Consider the LM2678 series for higher current demands exceeding 5A. Evaluate thermal management requirements based on the TO-263-7 package thermal resistance.
Part Context
Part of the SIMPLE SWITCHER family designed for simplified power supply design. The LM2677 series integrates the controller, driver, and power switch into a single monolithic IC. This reduces component count and board space compared to discrete solutions. The synchronous design improves efficiency over traditional non-synchronous buck regulators.
Replacement Considerations
LM2677S-3.3/NOPB differs only in packaging (tube vs. reel). LM2678SX-3.3/NOPB offers 8A capability. LM2679SX-3.3/NOPB uses VSON-14 package. Verify pin compatibility and thermal performance before substitution.
