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Texas Instruments LM2679S-5.0/NOPB
- Part No.:
- LM2679S-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2679S-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 5A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:491
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Product details
Overview
LM2679S-5.0/NOPB from Texas Instruments is a monolithic 5-A step-down (buck) DC/DC voltage regulator with fixed 5-V output, integrated 120-mΩ DMOS power switch, 260-kHz fixed-frequency oscillator, and resistor-programmable current limit (5.5–7.6 A). It operates from 8 V to 40 V input and delivers ±2% output voltage accuracy over line, load, and temperature for industrial power conversion.
For engineers reviewing the LM2679S-5.0/NOPB datasheet, LM2679S-5.0/NOPB pinout, LM2679S-5.0/NOPB application, or LM2679S-5.0/NOPB equivalent, key selection considerations include its TO-263-7 package thermal performance, soft-start timing capacitor interface, boot-strap capacitor requirement, and feedback pin configuration for fixed-output operation.
Technical Context
The LM2679S-5.0/NOPB implements a voltage-mode PWM control architecture with internal 260-kHz oscillator and high-side DMOS switch. Its feedback loop uses a precision 1.21-V reference and low-bias-current amplifier (85 nA) to regulate output directly-no external divider required for fixed 5-V operation.
Current limiting is set via an external resistor (RADJ = 5.6 kΩ yields 5.5–7.6 A peak switch current), and soft-start is controlled by a capacitor on SS pin. The CB pin requires a 0.01-μF ceramic capacitor tied to the switch node to drive the high-side gate above VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% over full line/load/temperature range - ensures stable rail for microcontrollers or FPGAs without external resistors. |
| Max Output Current | 5 A continuous - supports high-power digital loads such as SoCs or motor drivers without external current sharing. |
| Input Voltage Range | 8 V to 40 V - compatible with 12-V/24-V industrial buses and unregulated AC-DC front-ends. |
| Switching Frequency | 260 kHz ±11% - enables use of compact off-the-shelf inductors (e.g., 10 μH) and reduces EMI compared to higher-frequency alternatives. |
| Efficiency | 84% typical at 12-V input / 5-A load - minimizes thermal stress and eliminates need for forced-air cooling in enclosed systems. |
| ON-Resistance | 0.12 Ω typical at 25°C - reduces conduction loss and improves thermal margin versus discrete MOSFET solutions. |
| Quiescent Current | 6 mA max - maintains low standby power in always-on industrial controllers. |
Pinout & Package
LM2679S-5.0/NOPB is packaged in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad (10.10 mm × 8.89 mm). The DAP must be soldered to PCB ground for optimal thermal performance (RθJA = 26°C/W with 0.4896 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain of internal high-side DMOS FET - connects to inductor and Schottky diode cathode; switches between VIN and ~−0.5 V during OFF-time. |
| 2 (VIN) | Input supply | Main power input (8–40 V); supplies internal bias and high-side gate driver - requires low-ESR input capacitors placed adjacent to this pin. |
| 3 (CB) | Bootstrap capacitor | Connects to SW via 0.01-μF ceramic capacitor - generates gate drive voltage > VIN to fully enhance internal FET and minimize RDS(ON). |
| 4 (GND) | Power ground | Primary return path for input/output capacitors and IC substrate - must tie to large copper pour for thermal and noise control. |
| 5 (IADJ) | Current limit adjust | Accepts resistor to GND (5.6 kΩ sets 5.5–7.6 A peak current) - enables overcurrent protection tuning without changing layout. |
| 6 (FB) | Feedback sense | Internally connected to 5-V output divider - shorted to VOUT for fixed version; no external components needed. |
| 7 (SS) | Soft-start | Accepts capacitor to GND (e.g., 1 nF = ~10-ms ramp) - controls output voltage rise time to limit inrush into downstream capacitance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 120-mΩ DMOS switch | Eliminates external high-side MOSFET and driver, reducing BOM count and layout complexity for 5-A buck designs. |
| Resistor-programmable current limit | Enables precise overcurrent protection tuning (3–7 A range) using one external resistor - avoids derating or oversized magnetics. |
| 260-kHz fixed-frequency PWM | Provides predictable EMI profile and simplifies filter design versus variable-frequency controllers; supports standard inductor families. |
| ±2% output voltage tolerance | Meets tight regulation requirements for FPGA core rails or analog subsystems without post-regulation LDOs. |
| Soft-start with external capacitor | Prevents input surge during power-up - critical for systems with large downstream capacitance or shared input rails. |
Applications
| Industrial Motor Drive Power Supply | Programmable Logic Controller (PLC) I/O Module |
|---|---|
Use Scenario: Powers isolated I/O circuitry and field-side sensors in DIN-rail mounted PLC modules fed from 24-V DC bus. IC Role / Device Role / Timing Role: Primary 5-V buck regulator delivering clean, regulated power to digital isolators and ADC front-ends. Use Value: Delivers 5 A continuously with 84% efficiency at 24-V input, minimizing heat buildup in sealed enclosures without heatsinks. |
Use Scenario: Supplies 5-V rail to microcontroller, CAN transceiver, and optocoupler logic in modular PLC backplane slots. IC Role / Device Role / Timing Role: Fixed-output step-down regulator with soft-start to prevent brownout during hot-swap insertion. Use Value: ±2% output tolerance ensures reliable CAN communication and ADC reference stability across –40°C to 125°C junction temperature. |
| Battery Charger Pre-Regulator | Test Equipment Power Subsystem |
Use Scenario: Steps down 36-V Li-ion pack voltage to 5-V intermediate rail for charging management ICs and USB ports. IC Role / Device Role / Timing Role: High-efficiency preregulator preceding linear chargers to reduce thermal dissipation. Use Value: 40-V absolute max input rating accommodates battery pack transient spikes; programmable current limit protects against shorted charger outputs. |
Use Scenario: Generates 5-V supply for embedded test controller, relay drivers, and signal conditioning circuits in automated test fixtures. IC Role / Device Role / Timing Role: Robust main DC/DC converter with thermal shutdown and current limiting for unattended operation. Use Value: TO-263 thermal pad enables 5-A operation at 70°C ambient without airflow - critical for dense, fanless test rack designs. |
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, but 3-A rated with 220-mΩ RDS(ON); no current limit adjustment pin. | Limited to ≤3-A loads; lacks programmable overcurrent protection. | Select when lower cost and reduced thermal demand justify lower current capability. |
| TPS54560DGQ | 60-V input, 5-A synchronous buck; adjustable frequency (100–2500 kHz); no external bootstrap cap needed. | Requires external compensation; higher BOM count; supports wider input range and tighter EMI control. | Choose for 48-V industrial systems or designs requiring frequency synchronization or spread-spectrum EMI reduction. |
Compared with LM2679S-5.0/NOPB, LM2678-5.0/NOPB offers lower cost and simpler layout for sub-3-A applications, while TPS54560DGQ provides higher input voltage tolerance and synchronous rectification at the expense of added design complexity and external component count.
Availability
LM2679S-5.0/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, programmable logic controllers, battery charger pre-regulators, and test equipment power subsystems requiring stable component supply and long-term manufacturability.
Supply support for LM2679S-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 specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and communications markets.
The LM2679 series belongs to TI's SIMPLE SWITCHER® family - designed for rapid, reliable implementation of high-current DC/DC buck converters using minimal external components and industry-standard magnetics.
FAQ
What is the maximum input voltage rating for LM2679S-5.0/NOPB?
The LM2679S-5.0/NOPB has an absolute maximum input voltage rating of 45 V, with recommended operating range from 8 V to 40 V. Operation above 40 V risks exceeding safe operating area limits and may trigger internal protection circuits. For sustained reliability, maintain VIN ≤ 40 V under all conditions including transients.
Does LM2679S-5.0/NOPB require an external feedback resistor network?
No. The LM2679S-5.0/NOPB is a fixed 5-V output variant - its internal feedback divider is factory-trimmed, so the FB pin is internally connected to the output. No external resistors are needed; simply connect FB directly to the 5-V output node for proper regulation.
How is current limit configured on LM2679S-5.0/NOPB?
Current limit is set by connecting a resistor (RADJ) between the IADJ pin and GND. With RADJ = 5.6 kΩ, the LM2679S-5.0/NOPB delivers 5.5–7.6 A peak switch current. The relationship is ICL = 37,125 / RADJ (in ohms), enabling precise overcurrent threshold tuning without layout changes.
What thermal performance can be expected from LM2679S-5.0/NOPB in TO-263 package?
In the TO-263-7 (KTW) package with 0.4896 in² of 1-oz copper connected to the DAP, LM2679S-5.0/NOPB achieves RθJA = 35°C/W. At 5-A load and 24-V input, junction temperature rise is ~175°C above ambient - confirming necessity of adequate copper area and thermal vias for reliable 125°C operation.
Can LM2679S-5.0/NOPB operate without the bootstrap capacitor?
No. The CB pin requires a 0.01-μF ceramic capacitor connected to the SW pin to generate gate drive voltage above VIN. Omitting this capacitor prevents full enhancement of the internal DMOS switch, causing excessive RDS(ON), thermal runaway, and potential device failure under load.
LM2679S-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:
- Tube
- 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)
LM2679S-5.0/NOPB FAQ
1.How can I place an order for LM2679S-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2679S-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 LM2679S-5.0/NOPB reliable?
The price and inventory of LM2679S-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 LM2679S-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2679S-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2679S-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2679S-5.0/NOPB?
LM2679S-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2679S-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 LM2679S-5.0/NOPB?
For technical support, including LM2679S-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2679S-5.0/NOPB requirements.
6.How does Aetrix verify that LM2679S-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2679S-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 LM2679S-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2679S-5.0/NOPB?
All LM2679S-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2679S-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 LM2679S-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2679S-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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