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Texas Instruments LM2679SD-5.0
- Part No.:
- LM2679SD-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2679SD-5.0.pdf
- Description:
- IC REG BUCK 5V 5A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,628
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Product details
Overview
LM2679SD-5.0 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 at 5.6 kΩ). 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 LM2679SD-5.0 datasheet, LM2679SD-5.0 pinout, LM2679SD-5.0 application, or LM2679SD-5.0 equivalent, key selection criteria include its 5-A continuous output capability, soft-start timing control via external capacitor, thermal shutdown protection, bootstrapped high-side gate drive, and compatibility with standard off-the-shelf inductors and low-ESR output capacitors.
Technical Context
The LM2679SD-5.0 implements a synchronous-buck topology using an internal N-channel DMOS switch controlled by a fixed 260-kHz PWM oscillator. Its feedback loop senses output voltage directly at the FB pin (shorted to VOUT for fixed versions), enabling ±2% regulation across –40°C to 125°C junction temperature.
Current limiting is set externally via a resistor from Current Adjust (pin 5) to GND, establishing ICL = 37,125 / RADJ; with 5.6 kΩ, peak current is 5.5–7.6 A. The CB pin supplies bootstrapped gate drive to the high-side switch, requiring a 0.01 µF ceramic capacitor between CB and Switch Output (pin 1).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% over full line, load, and temperature range - ensures stable rail for microcontrollers and logic without external divider. |
| Max Output Current | 5 A continuous - supports high-power loads such as FPGAs, motor drivers, or multi-rail systems without external current sharing. |
| Input Voltage Range | 8 V to 40 V - accommodates wide-input industrial, automotive, and telecom supply rails including unregulated 24-V and 36-V systems. |
| Switching Frequency | 260 kHz ±11% - enables use of compact, low-cost off-the-shelf inductors (e.g., 10 µH) and reduces EMI compared to higher-frequency alternatives. |
| RDS(ON) | 0.12–0.225 Ω - minimizes conduction loss at 5 A, supporting >84% efficiency at 12-V input and full load. |
| Soft-Start Control | Capacitor-programmable ramp on SS pin (pin 7) - limits inrush current during power-up, preventing input supply sag or fuse tripping. |
| Thermal Protection | Integrated thermal shutdown - disables switching above safe junction temperature (125°C), protecting device and system under overload or poor heatsinking. |
Pinout & Package
LM2679SD-5.0 is packaged in a 7-pin TO-263 (KTW) surface-mount package with exposed DAP for thermal dissipation (10.10 mm × 8.89 mm body size). Pin 4 (GND) and the DAP are internally connected and must be soldered to a large PCB copper area for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Switch Output) | High-side MOSFET drain | Switching node connecting to inductor and Schottky diode cathode; swings from VIN to ~−0.5 V during OFF time - requires tight layout and low-inductance routing. |
| 2 (Input) | Main power input | Connects to 8–40 V source and high-frequency input capacitor (3 × 15 µF/50 V recommended); path to CIN must be shortest possible to minimize noise and ringing. |
| 3 (CB) | Bootstrap capacitor connection | Requires 0.01 µF ceramic capacitor to Switch Output (pin 1); enables full enhancement of internal N-MOSFET gate for low RDS(ON). |
| 4 (GND) | Power ground | Common return for input/output capacitors, current sense, and thermal pad; must be tied to large copper pour for heat dissipation and noise control. |
| 5 (Current Adjust) | Peak current limit programming | Accepts resistor to GND (e.g., 5.6 kΩ sets 5.5–7.6 A limit); sets fault threshold without external sensing components. |
| 6 (FB) | Feedback input | Internally connected to 5-V output divider; for LM2679SD-5.0, shorted to VOUT - no external resistors needed for regulation. |
| 7 (SS) | Soft-start timing | Connects to capacitor to GND (e.g., 1 nF yields ~10-ms ramp); controls duty-cycle startup to prevent output overshoot and input surge. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 120-mΩ DMOS switch | Eliminates need for external high-current MOSFET and driver, reducing BOM count and layout complexity while maintaining >84% efficiency at 5 A. |
| Resistor-programmable current limit | Enables precise fault-current setting (3–7 A range) using one external resistor - simplifies overcurrent protection design versus fixed-limit alternatives. |
| Fixed-frequency 260-kHz operation | Provides predictable EMI profile and enables consistent filter design with standardized inductor families from Renco, Pulse, and Coilcraft. |
| Direct-output feedback (no divider) | For LM2679SD-5.0, FB pin is internally configured for 5-V regulation - removes external resistor network, improving accuracy and reducing component drift sensitivity. |
| Thermal shutdown + current limit protection | Provides dual-layer fault protection: current limit responds to short-circuit or overload within microseconds; thermal shutdown prevents damage during sustained overheating. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Provides clean 5-V rail for microcontroller, CAN transceivers, and sensor interfaces in programmable logic controllers operating from 24-V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5-V output with 5-A headroom for transient loads like solenoid drivers or display backlights. Use Value: Wide 8–40 V input range tolerates battery voltage fluctuations and load-dump transients; ±2% output tolerance ensures reliable MCU operation without additional LDO post-regulation. | Use Scenario: Powers infotainment processor, memory, and USB peripherals in vehicle body control units fed from 12-V battery with alternator ripple. IC Role / Device Role / Timing Role: High-efficiency pre-regulator stepping down noisy 12–14.5 V battery voltage to stable 5 V before LDOs or point-of-load converters. Use Value: 260-kHz switching frequency avoids AM radio band; integrated current limit protects against wiring faults; thermal shutdown handles under-hood temperature extremes up to 125°C. |
| Battery Charger Auxiliary Rail | Test Equipment Power Stage |
Use Scenario: Generates isolated 5-V bias supply for charging ICs, fuel gauges, and protection circuitry in multi-cell Li-ion battery packs. IC Role / Device Role / Timing Role: Secondary regulator deriving 5 V from main charger's intermediate bus (e.g., 18–36 V), supporting hot-plug and charge-status signaling. Use Value: Soft-start prevents inrush into large battery management capacitors; resistor-adjustable current limit matches cell-count-dependent fault thresholds. | Use Scenario: Supplies 5-V/5-A rail for FPGA-based digital pattern generators, where fast load transients demand tight regulation and low output impedance. IC Role / Device Role / Timing Role: Main DC/DC stage feeding downstream low-noise LDOs; handles dynamic 0–5 A load steps with <100 mV undershoot per TI's typical load transient data. Use Value: 5-A capability eliminates parallel regulators; fixed 260-kHz frequency simplifies EMI filtering for compliance testing; GND pin layout supports low-noise analog reference generation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678SD-5.0 | Lower 3-A output rating; identical pinout, package, and feature set except reduced current limit and RDS(ON) (0.22 Ω typical). | Suitable only for ≤3-A loads; cannot replace LM2679SD-5.0 in 5-A designs without derating or paralleling. | Select when full 5-A capability is unnecessary and cost reduction is prioritized over headroom. |
| TPS54560DGQ | Adjustable output (0.8–60 V), 60-V max input, 5-A rating, but uses current-mode control and requires external compensation. | Supports wider input range and programmable output, but demands more complex loop design and lacks fixed 5-V option. | Choose for designs needing flexibility beyond 5 V or operation above 40 V, accepting added design effort. |
Compared with LM2678SD-5.0, the LM2679SD-5.0 provides 67% higher current capacity and lower RDS(ON), enabling single-chip 5-A solutions; versus TPS54560DGQ, it offers plug-and-play 5-V regulation with no compensation required, trading configurability for simplicity and faster time-to-market.
Availability
LM2679SD-5.0 is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control modules, battery charger auxiliary rails, and test equipment power stages requiring stable component supply with long-term manufacturability.
Supply support for LM2679SD-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 company specializing in analog, embedded processing, and power management technologies, with leadership in high-reliability industrial and automotive power solutions.
The LM2679 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for rapid, robust DC/DC buck converter implementation using minimal external components and industry-standard magnetics.
FAQ
What is the maximum input voltage rating for LM2679SD-5.0?
The absolute maximum input voltage for LM2679SD-5.0 is 45 V, but the recommended operating range is 8 V to 40 V per the datasheet. Operation above 40 V risks exceeding safe operating area limits and may trigger overvoltage protection or cause permanent damage. For 40-V nominal systems, ensure transient spikes remain below 45 V through proper input filtering and clamping.
Does LM2679SD-5.0 require an external feedback resistor divider?
No, LM2679SD-5.0 does not require an external feedback resistor divider. As a fixed 5-V output variant, its internal feedback network connects the FB pin (pin 6) directly to the regulated output, eliminating external resistors and associated tolerance errors. This configuration is confirmed in Section 6.6 and Figure 8 of the SNVS026O datasheet.
How is current limit set on LM2679SD-5.0?
Current limit on LM2679SD-5.0 is set by connecting a resistor (RADJ) from the Current Adjust pin (pin 5) to GND. The peak switch current follows ICL = 37,125 / RADJ. With a 5.6-kΩ resistor, the typical limit is 6.3 A at 25°C, ranging from 5.5 A to 7.6 A across temperature. This value is verified in Section 6.9 Electrical Characteristics.
What package type is used for LM2679SD-5.0?
LM2679SD-5.0 is supplied in the 7-pin TO-263 (KTW) package, featuring an exposed thermal pad (DAP) that must be soldered to a large PCB copper area. Its nominal body size is 10.10 mm × 8.89 mm, and it shares pinout compatibility with the TO-220 (NDZ) variant but differs from the 14-pin VSON (NHM) version.
Can LM2679SD-5.0 operate without a soft-start capacitor?
Yes, LM2679SD-5.0 can operate without a soft-start capacitor: the SS pin (pin 7) may be left floating if gradual output ramp-up is not required. However, omitting the capacitor increases input surge current during startup, potentially causing supply droop or triggering upstream overcurrent protection. TI recommends a 1-nF capacitor for ~10-ms soft-start as shown in typical application schematics.
LM2679SD-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)
LM2679SD-5.0 FAQ
1.How can I place an order for LM2679SD-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2679SD-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 LM2679SD-5.0 reliable?
The price and inventory of LM2679SD-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 LM2679SD-5.0 is usually 5 days.
3.What payment methods are accepted for LM2679SD-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2679SD-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2679SD-5.0?
LM2679SD-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2679SD-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 LM2679SD-5.0?
For technical support, including LM2679SD-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2679SD-5.0 requirements.
6.How does Aetrix verify that LM2679SD-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2679SD-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 LM2679SD-5.0 meets industry standards.
7.What is the process for return or replacement of LM2679SD-5.0?
All LM2679SD-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2679SD-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 LM2679SD-5.0 part is unused and in its original packaging.
Return procedure for LM2679SD-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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