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Texas Instruments LM2676T-5.0
- Part No.:
- LM2676T-5.0
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2676T-5.0.pdf
- Description:
- IC REG BUCK 5V 3A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:4,708
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Product details
Overview
LM2676T-5.0 from Texas Instruments is a monolithic step-down (buck) switching regulator IC delivering up to 3A output current with fixed 5.0V output, 8–40V input range, 260kHz fixed-frequency operation, and ±2% output voltage tolerance over full line/load/temperature. It integrates a 150mΩ DMOS high-side switch and supports ON/OFF control for low-power standby mode in industrial power supplies.
For engineers reviewing the LM2676T-5.0 datasheet, LM2676T-5.0 pinout, LM2676T-5.0 application, or LM2676T-5.0 equivalent, key selection criteria include its 3A continuous output capability, thermal shutdown protection, 50µA standby quiescent current, and compatibility with standard off-the-shelf inductors and Schottky diodes in compact TO-263-7 (KTW) packaging.
Technical Context
The LM2676T-5.0 implements a voltage-mode PWM controller with a fixed 260kHz oscillator and internal error amplifier driving a high-side DMOS switch. Its feedback loop uses direct connection of the FB pin to the output for fixed 5.0V regulation-no external divider required-enabling stable operation with minimal external components.
It operates in continuous conduction mode (CCM) across its rated load range, features built-in current limiting (3.6–5.4A), thermal shutdown, and precise ON/OFF threshold (0.8–2.0V) enabling reliable enable/disable sequencing. The CB pin supports bootstrap gate drive for efficient high-side FET turn-on without external charge pumps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% over –40°C to 125°C junction temperature, 8–40V input, 100mA–3A load. |
| Max Output Current | 3A continuous DC output; current limit threshold 3.6–5.4A ensures safe overload handling. |
| Input Voltage Range | 8V to 40V DC-supports wide industrial input rails including 12V, 24V, and 36V systems. |
| Switching Frequency | 260kHz fixed (±11%), enabling use of compact, standardized inductors and minimizing EMI filtering burden. |
| Efficiency | Up to 88% at VIN = 12V, IOUT = 3A-achieved via 150mΩ RDS(ON) DMOS switch and optimized gate drive. |
| Quiescent Current | 6mA typical operating IQ; drops to 50µA in shutdown when ON/OFF pin < 0.8V-critical for battery-backed systems. |
| Thermal Protection | Integrated thermal shutdown activates above TJ ≈ 160°C; auto-recovery on cooldown ensures robust fault recovery. |
Pinout & Package
LM2676T-5.0 is supplied in the KTW (TO-263-7) thermally enhanced surface-mount package (10.1mm × 15.24mm), featuring an exposed thermal pad connected internally to GND for optimal PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal high-side DMOS FET; connects directly to inductor and cathode of external catch diode-high dv/dt node requiring careful layout. |
| 2 (VIN) | Input supply | Main power input (8–40V); must be bypassed with low-ESR capacitor placed adjacent to pin to minimize switching noise coupling. |
| 3 (CB) | Bootstrap capacitor | Connects 100nF ceramic capacitor to SW pin to generate gate drive voltage > VIN for full enhancement of high-side FET. |
| 4 (GND) | Power ground | Primary return path for input/output capacitors and thermal pad; requires low-inductance connection to system ground plane. |
| 5 (NC) | No connect | Internally unconnected; must remain floating-no routing or soldering permitted. |
| 6 (FB) | Feedback sense | Direct connection to 5.0V output (no resistor divider) enables precise fixed-output regulation; sensitive to noise-keep trace short and away from SW node. |
| 7 (ON/OFF) | Enable control | Logic-level input: ≥1.4V enables regulation; ≤0.8V disables output and reduces IQ to 50µA; internal 20µA pull-up simplifies interface. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS switch | Enables high-efficiency 3A buck conversion without external MOSFETs-reduces BOM count and layout complexity. |
| Fixed 5.0V output with ±2% tolerance | Eliminates need for external feedback resistors, improving accuracy and reducing drift vs. temperature and aging. |
| 260kHz fixed-frequency PWM | Allows predictable EMI spectrum and use of small, off-the-shelf inductors-no frequency compensation required. |
| 50µA shutdown quiescent current | Supports ultra-low-power standby modes in metering, remote sensors, and always-on industrial controllers. |
| Built-in thermal shutdown & current limit | Provides autonomous fault protection without external circuitry-ensures reliability under overload or poor heatsinking. |
Applications
| Industrial Power Supplies | Electricity Meters |
|---|---|
|
Use Scenario: Primary DC-DC conversion stage powering microcontrollers, ADCs, and communication interfaces in DIN-rail mounted PLCs and motor drives. IC Role / Device Role / Timing Role: Main 5V rail generator converting unregulated 24V industrial bus to clean, regulated 5V for logic and analog subsystems. Use Value: Delivers 3A continuous current with 88% efficiency at 12V input, reducing thermal load and enabling compact enclosure design without forced air cooling. |
Use Scenario: On-board power for metrology SoCs, RTCs, and optical pulse readers in smart electricity meters with long-life battery backup. IC Role / Device Role / Timing Role: High-efficiency 5V regulator supplying critical measurement circuitry while maintaining sub-100µA standby draw during sleep cycles. Use Value: 50µA shutdown current extends 10-year battery life; ±2% output tolerance ensures accurate ADC reference stability across temperature. |
| Communication Modules | Motor Drive Control Boards |
|
Use Scenario: Powering RS-485 transceivers, Ethernet PHYs, and wireless modems (LoRa, NB-IoT) in field-deployed gateways and edge nodes. IC Role / Device Role / Timing Role: Isolated 5V supply for interface ICs-rejects input ripple and transient noise from shared 24V plant power. Use Value: Integrated current limiting and thermal shutdown prevent latch-up during cable ESD events; 260kHz switching avoids interference with 2.4GHz RF bands. |
Use Scenario: Auxiliary 5V rail for gate drivers, current-sense amplifiers, and MCU peripherals in BLDC and stepper motor controllers. IC Role / Device Role / Timing Role: Robust local regulator decoupled from noisy main DC bus-maintains logic integrity during high-current motor commutation. Use Value: TO-263-7 package with thermal pad sustains 3A loads at 85°C ambient; fast ON/OFF control synchronizes power-up with motor enable signals. |
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 | Lower 1.5A output rating; 150kHz switching; higher RDS(ON) (~220mΩ); no integrated thermal shutdown. | Suitable only for <1.5A loads; less efficient at high current; requires external thermal management. | Select LM2596T-5.0 only if cost is primary constraint and load current remains below 1.2A with ample heatsinking. |
| TPS54302DDAR | 3A synchronous buck; 2.5–6V input; 500kHz–2.2MHz adjustable frequency; 28µA IQ; smaller 8-pin SOIC package. | Requires external feedback resistors; limited to low-input-voltage systems; lacks 8–40V wide-range flexibility. | Choose TPS54302DDAR for space-constrained, low-VIN designs where programmable frequency and ultra-low IQ outweigh input range needs. |
Compared with LM2676T-5.0, LM2596T-5.0 trades output capability and protection for lower cost, while TPS54302DDAR offers higher integration and frequency agility at the expense of input voltage range and fixed-output simplicity-making LM2676T-5.0 optimal for rugged 24V/36V industrial buck conversion.
Availability
LM2676T-5.0 is available at Aetrix Electronics and suitable for industrial power supplies, electricity meters, and motor drive control boards requiring stable component supply, long-term lifecycle support, and consistent parametric performance across manufacturing lots.
Supply support for LM2676T-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 technologies, with decades of expertise in high-reliability industrial and automotive power solutions.
The LM2676 series belongs to TI's SIMPLE SWITCHER® portfolio-designed specifically for engineers needing robust, easy-to-implement DC-DC buck converters with minimal external components and proven thermal performance in harsh environments.
FAQ
What is the maximum input voltage rating for the LM2676T-5.0?
The LM2676T-5.0 has an absolute maximum input voltage rating of 45V, but its recommended operating input range is strictly 8V to 40V DC. Operation above 40V risks exceeding internal device stress limits and may trigger premature thermal shutdown or reduce long-term reliability-even if within absolute max ratings.
Does the LM2676T-5.0 require an external feedback resistor network?
No, the LM2676T-5.0 does not require external feedback resistors. As a fixed 5.0V output variant, it uses internal precision resistors connected to the FB pin-simply tie FB directly to the output capacitor for regulation. This eliminates resistor tolerance errors and improves long-term output stability.
Can the LM2676T-5.0 operate in discontinuous conduction mode (DCM)?
Yes, the LM2676T-5.0 automatically transitions into discontinuous conduction mode at light loads (<~300mA). Its voltage-mode PWM architecture maintains regulation across both CCM and DCM, with documented load transient response waveforms confirming stable behavior down to 200mA pulses in DCM per the official datasheet Figure 5-15.
What thermal performance can be expected from the LM2676T-5.0 in TO-263-7 (KTW) package?
In the KTW package mounted on a 1.0064 in² copper area with 12 vias to inner layers, the LM2676T-5.0 achieves RθJA ≈ 26°C/W. At 3A output and 12V input, typical power dissipation is ~0.6W-resulting in ~16°C junction rise above ambient, well within the –40°C to 125°C operating range.
Is the ON/OFF pin of the LM2676T-5.0 compatible with 3.3V logic microcontrollers?
Yes-the ON/OFF pin of the LM2676T-5.0 accepts 3.3V logic-high signals directly. Its threshold is 1.4V (min), and it tolerates up to 6V absolute max. With an internal 20µA pull-up, a 3.3V GPIO can reliably enable the device without external level-shifting or current-limiting resistors.
LM2676T-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-7 Formed Leads
- Packaging:
- Tube
- 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:
- 3A
- 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
LM2676T-5.0 FAQ
1.How can I place an order for LM2676T-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676T-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 LM2676T-5.0 reliable?
The price and inventory of LM2676T-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 LM2676T-5.0 is usually 5 days.
3.What payment methods are accepted for LM2676T-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676T-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676T-5.0?
LM2676T-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676T-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 LM2676T-5.0?
For technical support, including LM2676T-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676T-5.0 requirements.
6.How does Aetrix verify that LM2676T-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2676T-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 LM2676T-5.0 meets industry standards.
7.What is the process for return or replacement of LM2676T-5.0?
All LM2676T-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2676T-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 LM2676T-5.0 part is unused and in its original packaging.
Return procedure for LM2676T-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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