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Texas Instruments LM2677SX-5.0/NOPB
- Part No.:
- LM2677SX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2677SX-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,182
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Product details
Overview
LM2677SX-5.0/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC voltage regulator with fixed 5-V output, 5-A load capability, 8 V to 40 V input range, integrated 100-mΩ DMOS power switch, and 260-kHz fixed-frequency PWM control-designed for high-efficiency (>90%) industrial power conversion in battery chargers and communications equipment.
For engineers reviewing the LM2677SX-5.0/NOPB datasheet, LM2677SX-5.0/NOPB pinout, LM2677SX-5.0/NOPB application, or LM2677SX-5.0/NOPB equivalent, key selection criteria include verified ±2% output tolerance over temperature, 50-μA standby current in shutdown mode, external sync capability (280–400 kHz), thermal shutdown protection, and TO-263-7 package compatibility with standard PCB layout practices.
Technical Context
The LM2677SX-5.0/NOPB implements a synchronous-buck topology using an internal high-side DMOS FET controlled by a 260-kHz oscillator or externally synchronized clock. Its feedback loop uses a precision 1.21-V reference and two-stage transconductance amplifier to maintain regulation without external compensation components in most designs.
It integrates current limiting (6.1–8.3 A), thermal shutdown, and ON/OFF enable logic with 1.4-V threshold. The BOOT capacitor (0.01 μF) supplies gate drive above VIN to ensure low RDS(ON), while the SYNC pin accepts TTL/CMOS clocks to shift switching frequency for EMI management or ripple spectrum positioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% over full line/load/temperature (–40°C to 125°C junction) |
| Max Output Current | 5 A continuous; current limit 6.1–8.3 A depending on temperature |
| Input Voltage Range | 8 V to 40 V DC - supports wide industrial and automotive battery inputs |
| Switching Frequency | 260 kHz internal oscillator; externally synchronizable from 280 kHz to 400 kHz |
| Efficiency | Up to 92% (at 12 VIN/5 A for 12-V version); 84% typical at 12 VIN/5 A for 5-V version |
| Quiescent Current | 6 mA active; 50–150 μA in shutdown (ON/OFF = low) |
| RDS(ON) | 0.12–0.225 Ω - enables low conduction loss and high efficiency at 5-A load |
Pinout & Package
LM2677SX-5.0/NOPB is packaged in TO-263-7 (KTW), a surface-mount thermally enhanced variant of the DDPAK with exposed thermal pad. It features 7 pins: VIN (2), VSW (1), CB (3), GND (4), SYNC (5), FB (6), ON/OFF (7).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Connects to unregulated DC source (8–40 V); feeds high-side FET drain and bypass capacitors |
| VSW | Switch node | Source of internal DMOS FET; connects to inductor and Schottky diode cathode - high dv/dt node requiring short trace routing |
| CB | Bootstrap capacitor terminal | Accepts 0.01-μF ceramic capacitor to VSW to generate gate drive voltage > VIN for full FET enhancement |
| GND | Power ground | Common return for input/output capacitors and thermal pad; must be low-inductance connection to PCB ground plane |
| SYNC | Frequency synchronization input | Accepts external 280–400 kHz clock to override internal oscillator; disables current-limit foldback when active |
| FB | Feedback sense | Internally connected to 5-V output for fixed versions; no external divider required - simplifies layout and improves stability |
| ON/OFF | Enable control | Logic-level input: ≥1.4 V enables regulation; ≤0.8 V forces shutdown with 50-μA quiescent draw |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100-mΩ DMOS switch | Enables 5-A output without external MOSFETs; reduces BOM count and layout complexity |
| ±2% output voltage tolerance | Guaranteed across full temperature and load range - eliminates need for post-production trimming in precision systems |
| External sync capability (280–400 kHz) | Allows precise ripple frequency control for EMI filtering and spectral compliance in radio/communications applications |
| 50-μA shutdown current | Supports ultra-low-power standby modes in battery-powered systems without auxiliary LDOs |
| Thermal shutdown + current limit | Provides autonomous fault protection under overload, short-circuit, or poor heatsinking conditions |
Applications
| Battery Charger | Industrial Power Supply |
|---|---|
Use Scenario: Charging 12-V lead-acid or LiFePO4 battery banks from variable 24-V truck or solar array inputs. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5-V/5-A output to charge controller ICs or microcontrollers. Use Value: Wide 8–40 V input accommodates fluctuating vehicle/solar voltages; thermal shutdown prevents damage during sustained overloads. | Use Scenario: Generating stable 5-V rail for PLC I/O modules, motor drivers, or sensor interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: High-current preregulator preceding linear regulators or LDOs to improve overall system efficiency. Use Value: 92% peak efficiency reduces heat sink requirements; TO-263 package enables direct mounting to metal chassis for passive cooling. |
| Communications Equipment | Test & Measurement Instrumentation |
Use Scenario: Providing clean 5-V supply to RF transceivers, baseband processors, and ADC/DAC subsystems in cellular repeaters. IC Role / Device Role / Timing Role: Synchronized buck converter operating at 350 kHz to avoid interference with sensitive IF bands. Use Value: External SYNC pin allows exact ripple frequency placement outside critical receive windows - verified in TI AN-1187 layout guidelines. | Use Scenario: Powering FPGA configuration circuits, analog front-ends, and display controllers in portable oscilloscopes or signal analyzers. IC Role / Device Role / Timing Role: Fixed-output step-down regulator with fast transient response for digital logic sequencing and analog bias rails. Use Value: 5-A capability supports burst-mode FPGA loads; ±2% tolerance ensures accurate ADC reference stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-5.0/NOPB | Same pinout, identical 5-V fixed output, but rated for 3-A max output current and lower RDS(ON) (150 mΩ) | Suitable only for ≤3-A loads; lacks thermal performance headroom for 5-A continuous operation | Select LM2678-5.0/NOPB only when load current remains below 3 A and board space/thermal budget is constrained |
| TPS54560BQPWPRQ1 | Automotive-grade 60-V input, 5-A buck with adjustable frequency (100 kHz–2.5 MHz), integrated soft-start, and enhanced EMI features | Requires external feedback resistors; higher BOM cost but supports wider input range and AEC-Q100 qualification | Choose TPS54560BQPWPRQ1 for automotive or harsh-environment designs where 60-V input surge immunity or qualification is mandatory |
Compared with LM2678-5.0/NOPB, LM2677SX-5.0/NOPB delivers 67% higher current capacity with identical footprint; versus TPS54560BQPWPRQ1, it offers simpler fixed-output implementation and lower cost but lacks automotive qualification and programmable soft-start.
Availability
LM2677SX-5.0/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, battery charging systems, and communications equipment requiring stable component supply with long-term manufacturability and consistent electrical performance.
Supply support for LM2677SX-5.0/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in high-reliability power conversion.
The LM2677 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use in non-isolated DC-DC buck applications where minimal external components, robust thermal behavior, and production-ready performance are prioritized over programmability.
FAQ
What is the maximum input voltage rating for LM2677SX-5.0/NOPB?
The absolute maximum input voltage for LM2677SX-5.0/NOPB is 45 V, but the recommended operating range is 8 V to 40 V DC. Exceeding 40 V may reduce reliability or trigger overvoltage protection in some configurations. TI specifies 40 V as the upper limit for guaranteed performance across temperature and load conditions per SNVS077J Rev J.
Does LM2677SX-5.0/NOPB require external feedback resistors?
No. LM2677SX-5.0/NOPB is a fixed-output 5-V version - its internal feedback divider is factory-trimmed and connected directly to the output. Pin 6 (FB) must be wired to the output capacitor's positive terminal with minimal trace length; no external resistors are needed or permitted for this variant.
Can LM2677SX-5.0/NOPB synchronize to an external clock?
Yes. LM2677SX-5.0/NOPB supports external synchronization via its SYNC pin (Pin 5). When driven with a TTL/CMOS-compatible square wave between 280 kHz and 400 kHz, the device locks its switching frequency to the external source - enabling precise ripple frequency control for EMI-sensitive applications.
What thermal considerations apply to LM2677SX-5.0/NOPB in TO-263-7 package?
In TO-263-7 (KTW) package, LM2677SX-5.0/NOPB achieves 26°C/W junction-to-ambient thermal resistance with 1.0064 in² copper area (7.4× package size). Proper PCB layout requires soldering the exposed thermal pad to a solid ground plane using ≥4 thermal vias to maintain <125°C junction temperature at 5-A load and 40-V input.
Is LM2677SX-5.0/NOPB RoHS-compliant and lead-free?
Yes. LM2677SX-5.0/NOPB carries the /NOPB suffix, indicating lead-free (Pb-free) and RoHS-compliant construction per TI's packaging standards. It meets JEDEC J-STD-020 moisture sensitivity level 3 and is compatible with standard SnAgCu reflow profiles.
LM2677SX-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 5A
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263 (DDPAK-7)
LM2677SX-5.0/NOPB FAQ
1.How can I place an order for LM2677SX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2677SX-5.0/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2677SX-5.0/NOPB reliable?
The price and inventory of LM2677SX-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2677SX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2677SX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2677SX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2677SX-5.0/NOPB?
LM2677SX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2677SX-5.0/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2677SX-5.0/NOPB?
For technical support, including LM2677SX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2677SX-5.0/NOPB requirements.
6.How does Aetrix verify that LM2677SX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2677SX-5.0/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2677SX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2677SX-5.0/NOPB?
All LM2677SX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2677SX-5.0/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2677SX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2677SX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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