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Texas Instruments LM2679T-5.0
- Part No.:
- LM2679T-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2679T-5.0.pdf
- Description:
- IC REG BUCK 5V 5A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,349
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Product details
Overview
LM2679T-5.0 from Texas Instruments is a monolithic 5-A step-down (buck) DC/DC voltage regulator with fixed 5-V output, 8–40 V input range, 260-kHz fixed-frequency PWM control, 120-mΩ DMOS high-side switch, and resistor-programmable current limit (5.5–7.6 A typical at RADJ = 5.6 kΩ). It delivers high-efficiency power conversion for industrial and embedded systems requiring stable 5-V rails.
For engineers reviewing the LM2679T-5.0 datasheet, LM2679T-5.0 pinout, LM2679T-5.0 application, or LM2679T-5.0 equivalent, key selection criteria include its ±2% output tolerance over line/load/temperature, soft-start capability via external capacitor, thermal shutdown protection, and compatibility with standard off-the-shelf inductors and low-ESR output capacitors.
Technical Context
The LM2679T-5.0 integrates a fixed-frequency (260 kHz) PWM controller with internal oscillator, error amplifier, current-sense circuitry, and a 120-mΩ DMOS high-side power switch. Its feedback loop uses a direct connection from FB pin to output for fixed 5-V versions, eliminating external resistive dividers.
Current limiting is implemented via an external resistor (RADJ) tied between Current Adjust pin and GND, setting peak switch current per ICL = 37,125 / RADJ. Soft-start is controlled by a capacitor from SS pin to GND, ramping duty cycle linearly to suppress inrush current during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% over full line (8–40 V), load (100 mA–5 A), and temperature (−40°C to +125°C) - ensures stable logic supply without trimming. |
| Switch ON-Resistance | 0.12 Ω (typ) at TJ = 25°C - minimizes conduction loss and enables >92% efficiency at 12-V input, 5-A load. |
| Oscillator Frequency | 260 kHz ±11% - enables use of compact, standardized inductors and reduces EMI compared to higher-frequency alternatives. |
| Peak Current Limit | 5.5–7.6 A (typ) with RADJ = 5.6 kΩ - protects against short-circuit and overload while supporting 5-A continuous operation. |
| Quiescent Current | 4.2–6 mA - maintains low standby power draw in always-on industrial subsystems. |
| Soft-Start Threshold | 0.63 V (typ) at SS pin - defines start-up voltage level triggering controlled ramp-up of output voltage. |
| Feedback Bias Current | 85 nA - allows high-impedance feedback networks without significant error contribution. |
Pinout & Package
LM2679T-5.0 is supplied in TO-263 (KTW) package: 7-pin surface-mount, thermally enhanced DDPAK with exposed DAP connected to Pin 9 (GND). Dimensions: 10.10 mm × 8.89 mm × 4.57 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Switch Output) | High-side DMOS drain node | Switching node connecting to inductor and Schottky diode cathode; swings from VIN to −0.5 V during operation. |
| 2 (Input) | Main power input | Accepts 8–40 V unregulated input; requires low-ESR ceramic bypass capacitor placed adjacent to minimize noise and loop inductance. |
| 3 (CB) | Bootstrap capacitor connection | Connects 0.01 µF capacitor to Switch Output (Pin 1) to generate gate drive voltage >VIN for full MOSFET enhancement. |
| 4 (GND) | Power ground reference | Common return path for input/output capacitors, thermal pad (DAP), and internal circuitry; must be low-impedance plane. |
| 5 (Current Adjust) | Programmable current limit setpoint | Accepts resistor to GND to set peak switch current per ICL = 37,125 / RADJ; default 5.6 kΩ yields ~6.6 A limit. |
| 6 (FB) | Output voltage sense input | Direct connection to 5-V output (no divider) - internal 1.21-V reference and amplifier regulate output to ±2% accuracy. |
| 7 (SS) | Soft-start timing input | Capacitor to GND sets ramp time; 1 nF yields ~10-ms soft-start - prevents input surge and output overshoot at turn-on. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 120-mΩ DMOS high-side switch | Enables 5-A continuous output without external FETs or complex gate drivers - reduces BOM count and layout area. |
| Resistor-programmable current limit | Supports precise fault-current tailoring (3–7 A range) using single external resistor - eliminates need for current-sense amplifiers or shunts. |
| 260-kHz fixed-frequency PWM | Ensures predictable EMI profile and simplifies filter design; compatible with industry-standard 10–47 µH inductors. |
| ±2% output voltage tolerance | Maintains tight regulation across temperature, line, and load - meets requirements for powering microcontrollers and analog ICs. |
| Thermal shutdown with hysteresis | Protects device under sustained overload or poor heatsinking; auto-recovery after junction cools below 145°C threshold. |
Applications
| Industrial Motor Control Power Supply | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Provides regulated 5-V rail for MCU, CAN transceivers, and sensor interfaces in motor drive auxiliary power stage. IC Role / Device Role / Timing Role: Primary buck regulator converting 12–24 V battery-derived input to clean 5-V logic supply. Use Value: Delivers 5-A peak current during actuator activation while maintaining <100 mV ripple and ±2% regulation under wide input transients. |
Use Scenario: Powers microcontroller, EEPROM, and LIN transceivers in vehicle body electronics with cold-crank immunity. IC Role / Device Role / Timing Role: High-input-range buck converter handling 6–40 V automotive battery variations including cranking dips. Use Value: Operates down to 8 V input with soft-start and thermal protection - sustains function during 6.5-V cold-crank events without reset. |
| Point-of-Load Converter for FPGA I/O Banks | Industrial PLC Digital I/O Module |
|
Use Scenario: Supplies configurable 5-V I/O bank voltage for Xilinx/Intel FPGAs in programmable logic controllers. IC Role / Device Role / Timing Role: Local step-down regulator delivering low-noise, fast-transient 5-V power adjacent to FPGA package. Use Value: Achieves <150 µs load transient recovery (500 mA ↔ 5 A) with 400 µF output capacitance - prevents I/O bank brownout. |
Use Scenario: Generates isolated 5-V supply for digital input conditioning circuits and optocoupler drivers in modular I/O racks. IC Role / Device Role / Timing Role: Robust main DC/DC stage feeding downstream LDOs and isolation barriers in harsh factory environments. Use Value: Withstands 40-V transients and operates continuously at 125°C junction - supports IP67-rated enclosures with minimal heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596T-5.0 | 3-A rated, 150-kHz switching frequency, no programmable current limit, higher RDS(ON) (0.22 Ω) | Limited to ≤3-A loads; less efficient at high current; lacks adjustable fault protection | Choose when cost sensitivity outweighs current headroom and efficiency needs. |
| TPS54560B | 5-A synchronous buck, 100–2500 kHz adjustable frequency, integrated high/low-side FETs, 3.5–60 V input | Requires external compensation; supports wider input range and higher efficiency (>94%) but more complex layout | Choose for designs needing synchronous rectification, wider VIN, or programmable frequency - accepts added design effort. |
Compared with LM2679T-5.0, LM2596T-5.0 offers lower cost but sacrifices 40% current capacity and thermal margin, while TPS54560B improves efficiency and input flexibility at the expense of external compensation and tighter layout constraints.
Availability
LM2679T-5.0 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, FPGA point-of-load supplies, and PLC digital I/O systems requiring stable component supply and long-term manufacturability.
Supply support for LM2679T-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 ease-of-use in non-isolated DC/DC buck applications where rapid design completion, minimal external components, and robust fault protection are critical.
FAQ
What is the maximum input voltage rating for LM2679T-5.0?
The absolute maximum input voltage for LM2679T-5.0 is 45 V, but the recommended operating range is 8 V to 40 V. Operation above 40 V risks exceeding safe operating area limits and may trigger internal protection circuits. The device is commonly used in 24-V industrial and 12–36-V automotive systems where transient spikes remain within specification.
Does LM2679T-5.0 require an external feedback resistor divider?
No, LM2679T-5.0 does not require an external feedback resistor divider. As a fixed 5-V output variant, it uses internal precision resistors to set the feedback reference. Pin 6 (FB) must be connected directly to the output capacitor's positive terminal to close the regulation loop - adding external resistors would disrupt the factory-trimmed 5-V setpoint.
How is the current limit configured on LM2679T-5.0?
The current limit on LM2679T-5.0 is configured using a single resistor (RADJ) connected between Pin 5 (Current Adjust) and GND. With RADJ = 5.6 kΩ, the typical peak switch current is 6.6 A. The relationship is defined as ICL = 37,125 / RADJ (in ohms), allowing adjustment from 3 A to 7 A by selecting appropriate resistor values.
What package type is used for LM2679T-5.0?
LM2679T-5.0 is packaged in the TO-263 (KTW) thermally enhanced DDPAK format: a 7-pin surface-mount package with an exposed thermal pad (DAP) that must be soldered to a PCB copper pour for effective heat dissipation. Its nominal body size is 10.10 mm × 8.89 mm, and the DAP is internally connected to Pin 9 (GND).
Can LM2679T-5.0 operate without a soft-start capacitor?
Yes, LM2679T-5.0 can operate without a soft-start capacitor - Pin 7 (SS) may be left floating if gradual output ramp-up is not required. However, omitting the capacitor increases inrush current during startup, potentially causing input voltage sag or triggering upstream current-limiting. For reliable system-level behavior, TI recommends a 1-nF capacitor to ground for ~10-ms soft-start.
LM2679T-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-7 Formed Leads
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- 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:
- Through Hole
- Supplier Device Package:
- TO-220-7
LM2679T-5.0 FAQ
1.How can I place an order for LM2679T-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2679T-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 LM2679T-5.0 reliable?
The price and inventory of LM2679T-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 LM2679T-5.0 is usually 5 days.
3.What payment methods are accepted for LM2679T-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2679T-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2679T-5.0?
LM2679T-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2679T-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 LM2679T-5.0?
For technical support, including LM2679T-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2679T-5.0 requirements.
6.How does Aetrix verify that LM2679T-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2679T-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 LM2679T-5.0 meets industry standards.
7.What is the process for return or replacement of LM2679T-5.0?
All LM2679T-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2679T-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 LM2679T-5.0 part is unused and in its original packaging.
Return procedure for LM2679T-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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