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Texas Instruments LM2676T-5.0/NOPB
- Part No.:
- LM2676T-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-220-7 Formed Leads
- Datasheet:
-
LM2676T-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A TO220-7
- Quantity:
- Payment:
- Shipping:
Inventory:863
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Product details
Overview
LM2676T-5.0/NOPB 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 –40°C to 125°C junction 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/NOPB datasheet, LM2676T-5.0/NOPB pinout, LM2676T-5.0/NOPB application, or LM2676T-5.0/NOPB equivalent, key selection criteria include its 3A continuous load 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/NOPB implements a fixed-frequency PWM buck converter architecture with an internal 260kHz oscillator and integrated 150mΩ DMOS high-side switch. Its feedback loop uses direct connection of the FB pin to the output capacitor for fixed 5.0V regulation, eliminating external resistor dividers.
It operates in continuous conduction mode (CCM) up to 3A load, features built-in current limiting (3.6–5.4A), thermal shutdown, and ON/OFF control with 1.4V threshold and 20µA input bias current. The CB pin enables bootstrap gate drive for efficient high-side FET turn-on.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% over full line, load, and temperature (–40°C to 125°C) |
| Max Output Current | 3A continuous - supports industrial motor drives and communication modules without external current boosting |
| Input Voltage Range | 8V to 40V - compatible with 12V/24V industrial rails and unregulated DC sources |
| Switching Frequency | 260kHz ±11% - enables use of compact, standardized inductors (e.g., 33µH) and reduces EMI filtering burden |
| RDS(ON) | 0.15Ω typical - minimizes conduction loss at 3A, enabling >88% efficiency at 12VIN/5VOUT |
| Standby Current | 50µA max - allows deep power-down in battery-backed or energy-sensitive systems |
| Thermal Protection | Integrated thermal shutdown - disables output above safe junction temperature, preventing damage during overload |
Pinout & Package
LM2676T-5.0/NOPB is packaged in TO-263-7 (KTW), a surface-mount thermally enhanced package measuring 10.1mm × 15.24mm with exposed tab for PCB thermal relief. The tab is electrically connected to GND and must be soldered to a copper pour for optimal thermal performance.
| 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 Schottky catch diode; switches between VIN and ~–0.4V |
| 2 (VIN) | Input supply | Main power input (8–40V); requires low-ESR bypass capacitor placed within 5mm for stable high-frequency operation |
| 3 (CB) | Bootstrap capacitor | Connects to SW via 100nF ceramic capacitor - provides 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 inductor - must be tied to large copper plane for low-impedance thermal and noise management |
| 5 (NC) | No connect | Internally unconnected - must remain floating; no routing or soldering required |
| 6 (FB) | Feedback sense | Direct connection to output capacitor - enables fixed 5.0V regulation without external resistors; high-impedance input (85nA bias) |
| 7 (ON/OFF) | Enable control | Logic-level enable: ≥1.4V = active, ≤0.8V = shutdown; pulls up internally with 20µA - can be driven by microcontroller GPIO or open-drain signal |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS switch | Enables 3A output without external MOSFETs - reduces BOM count and layout complexity in space-constrained designs |
| Fixed 5.0V output with ±2% tolerance | Eliminates need for external feedback resistors - improves production yield and long-term stability vs. adjustable variants |
| 260kHz fixed-frequency PWM | Allows predictable EMI spectrum and simplifies filter design using industry-standard inductors (e.g., Renco, Pulse, Coilcraft) |
| 50µA standby quiescent current | Supports low-power sleep modes in metering and remote sensor applications - extends battery life or reduces system idle power |
| Built-in thermal shutdown & current limit | Provides autonomous fault protection - avoids external monitoring circuitry and ensures robustness under short-circuit or overheating conditions |
Applications
| Industrial Motor Drives | Smart Electricity Meters |
|---|---|
|
Use Scenario: Powering gate drivers and logic circuitry in 24V DC-fed brushless motor controllers. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying isolated I/O, MCU core, and current-sense amplifiers. Use Value: Delivers stable 5V at 3A with <100mV ripple under dynamic load steps - maintains timing integrity of PWM gate signals and ADC sampling. |
Use Scenario: Providing regulated 5V rail for metrology ASIC, RTC, and optical communication interface in Class 0.5S electricity meters. IC Role / Device Role / Timing Role: Main system power converter converting 12–36V auxiliary supply to precision 5V reference rail. Use Value: ±2% output tolerance and –40°C to 125°C operation ensure metrology accuracy across environmental extremes without recalibration. |
| Communication Module Power | Calling Button Operating Panel |
|
Use Scenario: Generating 5V for LTE/Wi-Fi modules in industrial IoT gateways with wide-input unregulated DC sources. IC Role / Device Role / Timing Role: Input-stage DC/DC converter accepting 12–40V field power and rejecting conducted noise from shared bus lines. Use Value: 8–40V input range and integrated EMI mitigation (via fixed 260kHz frequency) reduce need for upstream filtering components. |
Use Scenario: Supplying 5V to microcontroller, LED indicators, and tactile feedback circuitry in building access panels. IC Role / Device Role / Timing Role: Standby-optimized power source enabling instant wake-up from 50µA shutdown state upon button press. Use Value: Ultra-low standby current extends service life of backup coin-cell batteries while supporting fast (<100µs) power-up sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675T-5.0/NOPB | 2.5A output rating, same 5V fixed output, identical pinout and package (TO-263-7) | Lower current capacity limits use in high-dynamic-load motor drive or multi-rail systems | Select when 2.5A suffices and cost optimization is prioritized over headroom |
| LMR51430RGER | Synchronous 3A buck with 4.5–36V input, 500kHz/1.1MHz selectable frequency, QFN-12 package | Higher efficiency (>92% typical), smaller footprint, but requires external compensation and lacks ON/OFF pin pull-up | Choose for new designs requiring higher density, better light-load efficiency, or programmable frequency - not drop-in compatible |
Compared with LM2676T-5.0/NOPB, LM2675T-5.0/NOPB offers identical form-factor and function at reduced current capability, while LMR51430RGER delivers modern synchronous efficiency and flexibility at the cost of increased design complexity and non-pin-compatible layout.
Availability
LM2676T-5.0/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, smart electricity meters, communication module power, and calling button operating panels requiring stable component supply, long-lifecycle support, and proven thermal reliability in extended temperature environments.
Supply support for LM2676T-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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2676 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use in cost-sensitive, thermally demanding industrial and metering applications where minimal external components and robust fault protection are essential.
FAQ
What is the maximum input voltage rating for LM2676T-5.0/NOPB?
The absolute maximum input voltage for LM2676T-5.0/NOPB is 45V, but the recommended operating range is 8V to 40V. Exceeding 40V continuously may trigger overvoltage stress on internal circuitry and reduce long-term reliability. Designs operating near 40V should verify thermal margin under full load, especially in TO-263-7 packages with limited heatsinking.
Does LM2676T-5.0/NOPB require external feedback resistors?
No, LM2676T-5.0/NOPB does not require external feedback resistors. As a fixed-output variant, it internally sets the 5.0V regulation point; the FB pin must be connected directly to the output capacitor. This eliminates resistor tolerance errors and simplifies layout - a key advantage over adjustable versions like LM2676-ADJ.
Can LM2676T-5.0/NOPB be used in discontinuous conduction mode (DCM)?
Yes, LM2676T-5.0/NOPB operates in both continuous and discontinuous conduction modes depending on load and inductor value. At light loads (<500mA with 33µH inductor), it naturally transitions to DCM, reducing switching losses and improving light-load efficiency - confirmed in Figure 5-13 of the official datasheet.
What is the thermal resistance (RθJA) of LM2676T-5.0/NOPB in TO-263-7 package?
In the TO-263-7 (KTW) package, LM2676T-5.0/NOPB has a junction-to-ambient thermal resistance (RθJA) of 56°C/W with minimal copper (0.136 in²), 35°C/W with 0.4896 in² copper, and 26°C/W with 1.0064 in² copper per TI's datasheet Section 5.4. Proper PCB copper area and thermal vias to inner layers are critical to sustain 3A output at 125°C ambient.
Is LM2676T-5.0/NOPB RoHS-compliant and lead-free?
Yes, LM2676T-5.0/NOPB is RoHS-compliant and lead-free. The "/NOPB" suffix explicitly denotes "No Lead (Pb)-Free", confirming compliance with EU RoHS Directive 2011/65/EU and TI's green packaging standards. It uses matte-tin lead finish and halogen-free molding compound.
LM2676T-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-220-7 Formed Leads
- 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:
- 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/NOPB FAQ
1.How can I place an order for LM2676T-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676T-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 LM2676T-5.0/NOPB reliable?
The price and inventory of LM2676T-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 LM2676T-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2676T-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676T-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676T-5.0/NOPB?
LM2676T-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676T-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 LM2676T-5.0/NOPB?
For technical support, including LM2676T-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676T-5.0/NOPB requirements.
6.How does Aetrix verify that LM2676T-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2676T-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 LM2676T-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2676T-5.0/NOPB?
All LM2676T-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2676T-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 LM2676T-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2676T-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2676T-5.0/NOPB Tags
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