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Texas Instruments LM2679SDX-5.0
- Part No.:
- LM2679SDX-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2679SDX-5.0.pdf
- Description:
- IC REG BUCK 5V 5A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,763
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Product details
Overview
LM2679SDX-5.0 from Texas Instruments is a monolithic 5A step-down (buck) DC/DC voltage regulator with fixed 5.0V output, 260 kHz internal oscillator, 8V–40V input range, and resistor-programmable current limit. It integrates a 120 mΩ DMOS power switch and supports softstart for inrush control-used in industrial power supplies and battery chargers requiring stable 5V/5A regulation.
For engineers reviewing the LM2679SDX-5.0 datasheet, LM2679SDX-5.0 pinout, LM2679SDX-5.0 application, or LM2679SDX-5.0 equivalent, key selection criteria include its ±2% output tolerance over full line/load, thermal shutdown protection, adjustable peak current limit (3A–7A), and compatibility with standard off-the-shelf inductors and low-ESR output capacitors.
Technical Context
The LM2679SDX-5.0 implements a fixed-frequency PWM buck controller with internal 260 kHz oscillator and integrated 120 mΩ DMOS high-side switch. Its feedback loop uses a precision 1.21V reference and two-stage amplifier to regulate output voltage directly via the FB pin-no external resistors required for the 5.0V fixed version.
Current limiting is achieved through a dedicated CURRENT ADJ pin that accepts a resistor to set peak switch current from 3A to 7A using ICL = 37,125 / RADJ. Softstart is implemented via a linear ramp on the SS pin driven by a 3.7 µA internal current source, enabling controlled duty-cycle ramp-up at power-on.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% over −40°C to +125°C, 8V–40V input, 100mA–5A load-ensures stable logic/system rail without external feedback divider. |
| Max Output Current | 5A continuous-supports high-power microcontrollers, FPGAs, and motor drivers without external current boosting. |
| Input Voltage Range | 8V to 40V-compatible with 12V/24V industrial buses, automotive batteries (with transient suppression), and wide-range AC/DC front-ends. |
| Switching Frequency | 260 kHz ±11%-enables use of compact, standardized off-the-shelf inductors (e.g., 10 µH) while balancing EMI and efficiency. |
| Efficiency | Up to 92% at 12VIN/5VOUT/5A-achieved via low RDS(on) (120 mΩ) DMOS switch and optimized gate drive with BOOST capacitor. |
| Current Limit Range | 3A to 7A programmable via single RADJ resistor-allows inductor/diode derating for cost, size, and fault energy reduction. |
| Softstart Control | Capacitor-programmable (e.g., 1 nF → ~170 ms ramp)-reduces input surge current and prevents output overshoot during cold start. |
Pinout & Package
LM2679SDX-5.0 is packaged in a 14-pin VSON (NHM0014A) with exposed thermal pad (DAP), optimized for high-power density and thermal performance on PCBs with copper pour and vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSW | Switch Node | Drives external inductor; swings between VIN and ~−0.5V (Schottky drop); requires low-inductance layout and BOOST capacitor (0.01 µF) to gate-drive MOSFET fully ON. |
| VIN | Power Input | Supplies internal circuitry and switch; must be bypassed with ≥3×15 µF/50V ceramic input capacitors placed near pin to suppress ripple and ringing. |
| CBOOST | Bootstrap Capacitor | Connected between VSW and CBOOST pins; provides gate overdrive voltage >VIN to minimize RDS(on) and conduction loss. |
| GND | Power Ground | Common return for switch, feedback, and bias circuits; requires low-impedance ground plane to prevent noise coupling into FB or SS pins. |
| CURRENT ADJ | Current Limit Set | Accepts resistor to GND; sets peak switch current as ICL = 37,125 / RADJ (e.g., 5.6 kΩ → 6.3 A typical). |
| FB | Feedback Input | Monitors regulated 5.0V output directly; internal 1.21V reference and amplifier eliminate need for external resistor divider. |
| SOFTSTART | Softstart Timing | Charged by 3.7 µA internal current; voltage ramp controls PWM duty-cycle ramp-up; open-circuit disables softstart. |
| DAP | Thermal Pad | Exposed die attach paddle; must be soldered to PCB ground plane with ≥12 thermal vias for θJA = 29°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 120 mΩ DMOS Switch | Enables 5A output without external MOSFET; reduces BOM count and layout complexity while maintaining >90% efficiency at full load. |
| Resistor-Programmable Current Limit | Allows precise tailoring of fault current threshold (3A–7A) to match inductor saturation and diode ratings-improves reliability and cost optimization. |
| 260 kHz Fixed-Frequency Operation | Provides predictable EMI profile and enables use of standardized, low-cost inductors from Renco, Pulse, and Coilcraft-accelerates design cycle. |
| Softstart with External Capacitor | Eliminates input surge current and output voltage overshoot during startup-critical for systems powering sensitive digital loads or hot-swap applications. |
| Thermal Shutdown Protection | Automatically disables switching if junction temperature exceeds safe limit (typically >150°C), preventing permanent damage under overload or poor heatsinking. |
Applications
| Industrial Power Supply | Battery Charger |
|---|---|
Use Scenario: 24V bus-powered PLC I/O module requiring clean, regulated 5V for microcontroller, sensors, and communication ICs. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 5V/5A with tight line/load regulation and thermal robustness across −40°C to +85°C ambient. Use Value: Eliminates need for discrete MOSFET + controller solution; ±2% output tolerance ensures reliable logic-level operation without post-regulation LDOs. | Use Scenario: 12V–36V input lithium-ion battery charger for portable medical devices, where constant-voltage stage requires stable 5V auxiliary rail. IC Role / Device Role / Timing Role: Pre-regulator generating isolated 5V supply for charging controller, ADC, and display-operating across wide input transients. Use Value: 8V–40V input range accommodates battery pack voltage swing; softstart prevents inrush into downstream charge management ICs. |
| Efficient System Pre-Regulator | High-Current FPGA Core Supply |
Use Scenario: Intermediate 5V rail feeding multiple linear regulators (e.g., for analog, I/O, and memory rails) in telecom base station equipment. IC Role / Device Role / Timing Role: High-efficiency (>90%) pre-regulator reducing heat generation before final LDO stages-minimizing total system thermal load. Use Value: 92% peak efficiency at 12VIN/5VOUT cuts power loss by >50% vs. linear pre-regulators, enabling higher power density in confined enclosures. | Use Scenario: Core voltage supply for Xilinx Artix-7 FPGA requiring 5V/4A with fast transient response and low output ripple. IC Role / Device Role / Timing Role: Primary buck converter with 260 kHz switching and low-ESR output capacitor network to meet FPGA dynamic current demands. Use Value: Programmable current limit (e.g., 5.6 kΩ → 6.3A) allows margin for FPGA current spikes while protecting inductor from saturation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678SDX-5.0 | Same pinout, 5A rating, but 280 kHz oscillator and no adjustable current limit-fixed 7A limit only. | Lacks programmable current limit; less flexible for inductor/diode optimization in cost-sensitive designs. | Select when softstart and current limit adjustment are unnecessary and higher switching frequency is acceptable. |
| TPS54560DGQ | 60V input, 5A, adjustable 3.5V–60V output, 100 kHz–2.5 MHz sync capability-but requires external feedback resistors and MOSFETs. | Wider input range and frequency flexibility, but increased design complexity and component count. | Select for ultra-wide input (e.g., 48V telecom) or when synchronous rectification and external frequency synchronization are required. |
Compared with LM2678SDX-5.0, the LM2679SDX-5.0 offers critical programmable current limiting for optimized magnetics sizing; versus TPS54560DGQ, it delivers simpler, lower-BOM-count implementation for fixed 5V/5A applications-trading configurability for ease-of-use and proven thermal reliability in industrial environments.
Availability
LM2679SDX-5.0 is available at Aetrix Electronics and suitable for industrial power supplies, battery chargers, and FPGA core supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2679SDX-5.0 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 leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2679 series belongs to TI's SIMPLE SWITCHER® family-designed specifically for rapid, robust, and low-component-count DC/DC buck regulator implementations targeting industrial, automotive, and communications equipment.
FAQ
What is the maximum input voltage rating for LM2679SDX-5.0?
The absolute maximum input voltage for LM2679SDX-5.0 is 45V, but the recommended operating range is 8V to 40V per the datasheet. Exceeding 40V may trigger internal protection or reduce reliability-designs should include input transient suppression if used in 48V systems. The LM2679SDX-5.0 maintains regulation and thermal safety within this window across its full temperature range.
Does LM2679SDX-5.0 require an external feedback resistor divider?
No, LM2679SDX-5.0 does not require an external feedback resistor divider. It integrates internal precision resistors to set the 5.0V output, connecting only the FB pin directly to the output. This simplifies layout, improves accuracy (±2% tolerance), and eliminates drift from external resistor tolerances-distinct from the adjustable LM2679-ADJ variant which requires two external resistors.
How is the current limit programmed on LM2679SDX-5.0?
The current limit on LM2679SDX-5.0 is programmed using a single resistor (RADJ) from the CURRENT ADJ pin to GND. The peak switch current follows ICL = 37,125 / RADJ, so a 5.6 kΩ resistor yields ~6.3 A typical. This allows designers to match the current limit precisely to inductor saturation and diode ratings-LM2679SDX-5.0 supports limits from 3A to 7A without changing the IC itself.
What package type is used for LM2679SDX-5.0, and how is thermal performance achieved?
LM2679SDX-5.0 uses the 14-pin VSON (NHM0014A) package with an exposed die attach pad (DAP). Thermal performance relies on soldering the DAP to a PCB ground plane with ≥12 thermal vias-achieving θJA = 29°C/W. This is critical for sustaining 5A output at elevated ambient temperatures; insufficient copper area or missing vias will cause thermal shutdown under full load.
Can LM2679SDX-5.0 be synchronized to an external clock?
No, LM2679SDX-5.0 cannot be synchronized to an external clock. It features a fixed 260 kHz internal oscillator with ±11% tolerance and no synchronization pin. For designs requiring frequency alignment (e.g., to avoid beat frequencies in multi-rail systems), alternatives like TPS54560DGQ or LM5115 must be considered-LM2679SDX-5.0 prioritizes simplicity and integration over synchronization capability.
LM2679SDX-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 14-VSON (5x6)
LM2679SDX-5.0 FAQ
1.How can I place an order for LM2679SDX-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2679SDX-5.0 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 LM2679SDX-5.0 reliable?
The price and inventory of LM2679SDX-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2679SDX-5.0 is usually 5 days.
3.What payment methods are accepted for LM2679SDX-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2679SDX-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2679SDX-5.0?
LM2679SDX-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2679SDX-5.0 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 LM2679SDX-5.0?
For technical support, including LM2679SDX-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2679SDX-5.0 requirements.
6.How does Aetrix verify that LM2679SDX-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2679SDX-5.0 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 LM2679SDX-5.0 meets industry standards.
7.What is the process for return or replacement of LM2679SDX-5.0?
All LM2679SDX-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2679SDX-5.0, 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 LM2679SDX-5.0 part is unused and in its original packaging.
Return procedure for LM2679SDX-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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