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Texas Instruments LM2676SD-5.0
- Part No.:
- LM2676SD-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2676SD-5.0.pdf
- Description:
- IC REG BUCK 5V 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,003
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Product details
Overview
LM2676SD-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, 260kHz internal oscillator, 8–40V input range, 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 LM2676SD-5.0 datasheet, LM2676SD-5.0 pinout, LM2676SD-5.0 application, or LM2676SD-5.0 equivalent, key selection criteria include its fixed 5V output accuracy, thermal shutdown protection, 50µA standby quiescent current, and compatibility with standard off-the-shelf inductors and Schottky diodes in compact buck converter designs.
Technical Context
The LM2676SD-5.0 implements a fixed-frequency PWM control architecture with a 260kHz internal oscillator and integrated high-side DMOS FET. Its feedback loop uses an internal resistor divider to set 5.0V output, eliminating external resistors-unlike the adjustable version requiring FB pin configuration.
It operates in continuous conduction mode (CCM) at full load and transitions to discontinuous mode (DCM) under light loads. Built-in thermal shutdown, current limiting, and ON/OFF logic enable robust operation across –40°C to 125°C junction temperature with no external compensation required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% over full line, load, and –40°C to 125°C junction temperature-ensures stable rail for microcontrollers and sensors without external feedback resistors. |
| Max Output Current | 3A DC-supports mid-power applications like motor drivers and communication modules without external current boosting. |
| Input Voltage Range | 8V to 40V-enables direct use with 12V/24V industrial bus systems and battery-backed supplies without pre-regulation. |
| Switching Frequency | 260kHz ±11%-enables use of compact, standardized 33µH inductors and reduces EMI compared to lower-frequency alternatives. |
| Efficiency | Up to 88% at 12VIN/3AOUT-minimizes thermal load and simplifies heatsinking in enclosed enclosures. |
| Standby Current | 50µA typical when ON/OFF pin = 0V-enables ultra-low-power sleep modes in battery-operated metering and remote panels. |
| RDS(ON) | 150mΩ typical-reduces conduction loss and improves efficiency at high load currents versus discrete MOSFET solutions. |
Pinout & Package
LM2676SD-5.0 is supplied in the 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad, measuring 10.1mm × 15.24mm. The package supports high-current thermal dissipation via PCB copper area and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal high-side DMOS FET; connects directly to inductor and Schottky diode cathode-requires low-inductance layout to minimize ringing. |
| 2 (VIN) | Input supply | Primary power input (8–40V); must be bypassed with low-ESR capacitor placed adjacent to pin to stabilize high-frequency switching current. |
| 3 (CB) | Bootstrap capacitor | Connects to SW pin via 100nF ceramic capacitor to generate gate drive voltage > VIN for full FET enhancement-critical for low RDS(ON). |
| 4 (GND) | Power ground | Main return path for input/output capacitors and thermal pad; requires low-impedance connection to PCB ground plane for EMI and thermal performance. |
| 5 (NC) | No connect | Internally unconnected; must remain floating-no routing or soldering allowed. |
| 6 (FB) | Feedback input | Internally tied to 5.0V reference divider; for fixed-output version, connect directly to output capacitor-no external resistors needed. |
| 7 (ON/OFF) | Enable control | Logic-level input: ≥1.4V enables regulation; ≤0.8V disables output and reduces quiescent current to 50µA-supports system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS high-side switch | Eliminates need for external MOSFET and driver, reducing BOM count and layout complexity while maintaining >88% efficiency at 3A. |
| Fixed 5.0V output with ±2% tolerance | Guarantees precise rail generation across temperature and load without calibration or trimming-ideal for ADC references and logic I/O. |
| 260kHz fixed-frequency PWM | Enables predictable EMI filtering and consistent inductor sizing; avoids frequency jitter issues seen in variable-frequency controllers. |
| Built-in thermal shutdown & current limit | Protects against overload and ambient overheating without external circuitry-trip point at ~160°C junction, auto-recovery on cooldown. |
| 50µA standby quiescent current | Supports always-on subsystems (e.g., real-time clocks, wake-on-event circuits) with minimal battery drain in portable or metering applications. |
Applications
| Communication Module Power | Electricity Meter Supply |
|---|---|
Use Scenario: Powers baseband processor, RF transceiver, and isolated CAN/RS-485 interface in DIN-rail mounted smart meters. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying digital core and analog front-end from 24V DC bus. Use Value: Delivers stable 5V at 2.5A with <1% ripple under dynamic load steps-ensuring clean power for precision metrology ADCs and low-jitter UART timing. |
Use Scenario: Provides regulated 5V rail for microcontroller, LCD display, and pulse-counting circuitry in revenue-grade electricity meters. IC Role / Device Role / Timing Role: Main system regulator converting rectified AC-derived 12–36V DC to 5V, with ON/OFF controlled by meter's sleep/wake state. Use Value: 50µA standby current extends battery backup life during mains outage; ±2% output tolerance maintains RTC accuracy and EEPROM write integrity. |
| Calling Button Panel | Motor Drive Auxiliary Supply |
Use Scenario: Powers touch controller, LED indicators, and wireless BLE module in building intercom push-button panels powered from PoE or 24V DC. IC Role / Device Role / Timing Role: Compact 5V source enabling rapid wake-from-sleep response and reliable button debounce logic. Use Value: TO-263 package allows high-current capability in space-constrained enclosures; 260kHz switching avoids audible noise in residential environments. |
Use Scenario: Supplies gate drivers, op-amps, and MCU for 24V brushed DC motor control in HVAC actuators and industrial valves. IC Role / Device Role / Timing Role: Isolated auxiliary supply generating clean 5V for logic and sensing, decoupled from noisy motor power stage. Use Value: Integrated current limit and thermal shutdown prevent latch-up during motor stall events; 8–40V input accommodates wide battery or rectified supply variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-5.0 | Lower 1.2MHz switching frequency, 3A rating, but only ±4% output tolerance and no ON/OFF pin-requires external enable circuitry. | Lacks integrated enable and tighter regulation; suitable where cost is critical and 5V accuracy <±3% is acceptable. | Choose LM2596S-5.0 only if board space permits larger inductor and system does not require low-quiescent standby. |
| TPS54302DDCR | Higher 2.5MHz frequency, 3A, ±1% output tolerance, integrated soft-start, but requires external feedback resistors even for fixed 5V output. | Offers better transient response and smaller magnetics, but increases design complexity and component count. | Prefer TPS54302DDCR when fast load-step response or ultra-compact layout is mandatory, and design resources support resistor-based tuning. |
Compared with LM2676SD-5.0, LM2596S-5.0 trades regulation accuracy and control flexibility for lower cost, while TPS54302DDCR improves dynamic performance and precision at the expense of added external components and higher design effort.
Availability
LM2676SD-5.0 is available at Aetrix Electronics and suitable for industrial power conversion, smart metering, and motor control applications requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
Supply support for LM2676SD-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 power conversion ICs.
The LM2676 series was designed as part of TI's SIMPLE SWITCHER® portfolio to simplify robust, high-efficiency buck converter implementation using minimal external components-targeting industrial, metering, and automation systems.
FAQ
What is the maximum input voltage rating for the LM2676SD-5.0?
The LM2676SD-5.0 has an absolute maximum input voltage rating of 45V, with recommended operating range specified as 8V to 40V. Exceeding 40V continuously may reduce reliability or trigger overvoltage protection in some implementations. Always maintain input capacitance with adequate voltage derating-TI recommends ≥1.3× maximum expected input voltage for CIN.
Does the LM2676SD-5.0 require external feedback resistors to set its 5.0V output?
No, the LM2676SD-5.0 does not require external feedback resistors. It integrates an internal resistor divider calibrated for 5.0V output; the FB pin is internally connected and must be wired directly to the output capacitor. External resistors are only needed for the adjustable version (LM2676ADJ).
Can the LM2676SD-5.0 be used in a thermally constrained enclosure?
Yes-the LM2676SD-5.0 in the KTW (TO-263) package achieves θJA ≈ 35°C/W with 0.4896 in² copper and ≈ 26°C/W with 1.0064 in² copper plus 12 vias. Its built-in thermal shutdown activates at ~160°C junction temperature, allowing safe operation in sealed enclosures when PCB copper area and airflow are properly managed per TI's AN-1187 guidelines.
What is the purpose of the CB pin on the LM2676SD-5.0?
The CB (bootstrap capacitor) pin on the LM2676SD-5.0 connects to the SW pin via a 100nF ceramic capacitor to generate a gate drive voltage above VIN-enabling full enhancement of the internal high-side DMOS FET. Without proper CB capacitor placement and value, RDS(ON) increases significantly, degrading efficiency and thermal performance.
Is the LM2676SD-5.0 RoHS-compliant and lead-free?
Yes, the LM2676SD-5.0 is RoHS-compliant and lead-free per TI's official packaging documentation. The KTW package uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level (MSL) 3 requirements. Full compliance data-including REACH and conflict minerals-is available in TI's Q100 qualification reports for this device family.
LM2676SD-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:
- 3A
- 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)
LM2676SD-5.0 FAQ
1.How can I place an order for LM2676SD-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676SD-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 LM2676SD-5.0 reliable?
The price and inventory of LM2676SD-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 LM2676SD-5.0 is usually 5 days.
3.What payment methods are accepted for LM2676SD-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676SD-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676SD-5.0?
LM2676SD-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676SD-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 LM2676SD-5.0?
For technical support, including LM2676SD-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676SD-5.0 requirements.
6.How does Aetrix verify that LM2676SD-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2676SD-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 LM2676SD-5.0 meets industry standards.
7.What is the process for return or replacement of LM2676SD-5.0?
All LM2676SD-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2676SD-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 LM2676SD-5.0 part is unused and in its original packaging.
Return procedure for LM2676SD-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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