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Texas Instruments LM2676SDX-ADJ/NOPB
- Part No.:
- LM2676SDX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2676SDX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:473
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Product details
Overview
LM2676SDX-ADJ/NOPB from Texas Instruments is a monolithic step-down (buck) DC/DC switching regulator delivering up to 3A output current with adjustable output voltage (1.2V–37V), 260kHz fixed-frequency operation, and 8V–40V input range. It integrates a 150mΩ DMOS high-side switch and supports thermal shutdown, current limiting, and ON/OFF control-used in industrial power supplies requiring stable, high-efficiency conversion.
For engineers reviewing the LM2676SDX-ADJ/NOPB datasheet, LM2676SDX-ADJ/NOPB pinout, LM2676SDX-ADJ/NOPB application, or LM2676SDX-ADJ/NOPB equivalent, key selection criteria include its ±2% output tolerance over line/load/temperature, 50µA standby current, 88% typical efficiency at 12VIN/3A, feedback bias current of 85nA, and TO-263-7 (KTW) package thermal performance.
Technical Context
The LM2676SDX-ADJ/NOPB implements a fixed-frequency PWM buck controller with internal 260kHz oscillator and integrated 150mΩ DMOS high-side switch. Its feedback loop uses a two-stage high-gain amplifier referenced to a precise 1.21V internal reference (±1.15% over temperature), enabling accurate output regulation via external resistor divider on the FB pin.
Functional modes include active regulation (ON/OFF ≥1.4V) and shutdown (ON/OFF ≤0.8V), drawing only 50µA quiescent current. Protection features include cycle-by-cycle current limiting (typ. 4.5A), thermal shutdown, and built-in soft-start via capacitor on the CB pin-no external soft-start circuit required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | Up to 3A continuous load capability-supports mid-power industrial rails without external current boosting. |
| Input voltage range | 8V to 40V-compatible with 12V/24V/36V industrial bus systems and wide-range unregulated supplies. |
| Output voltage range | Adjustable 1.2V to 37V via external resistor divider-enables single-part flexibility across multiple system rails. |
| Feedback reference | 1.21V ±1.15% over –40°C to +125°C-ensures tight output tolerance without calibration or trimming. |
| Switching frequency | 260kHz ±11%-enables use of compact, off-the-shelf inductors (e.g., 33µH) and simplifies EMI filtering design. |
| Efficiency | 88% typical at 12VIN, 3A, 5VOUT-reduces thermal load and eliminates need for heatsinks in many applications. |
| Standby current | 50µA max when ON/OFF = 0V-enables low-power sleep modes in battery-backed or energy-sensitive systems. |
| Thermal protection | Integrated thermal shutdown with automatic recovery-prevents permanent damage during overload or poor heatsinking. |
Pinout & Package
LM2676SDX-ADJ/NOPB is supplied in the KTW (TO-263-7) package: thermally enhanced 7-pin surface-mount variant with exposed DAP (die attach pad) soldered to PCB ground plane for optimal thermal dissipation (RθJA = 35°C/W with 0.4896 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal DMOS FET; connects directly to inductor and Schottky diode cathode-requires low-inductance layout. |
| 2 (VIN) | Input supply | Primary power input (8–40V); must be bypassed with low-ESR capacitor placed adjacent to pin for stability. |
| 3 (CB) | Bootstrap capacitor | Connects to SW pin via 100nF ceramic capacitor-provides gate drive voltage >VIN to fully enhance internal FET. |
| 4 (GND) | Power ground | Main return path for input/output currents; tied to exposed DAP-must connect to large copper pour for thermal/EMI control. |
| 5 (NC) | No connect | Internally unconnected; leave floating-no routing or thermal tie required. |
| 6 (FB) | Feedback sense | High-impedance input (85nA bias) monitoring output via resistor divider-sensitive to noise; route away from SW node. |
| 7 (ON/OFF) | Enable control | Logic-level enable: ≥1.4V = active, ≤0.8V = shutdown; internal 20µA pull-up allows direct microcontroller GPIO control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS switch | Eliminates external MOSFET and driver, reducing BOM count and layout complexity while maintaining >88% efficiency at full load. |
| Fixed 260kHz oscillator | Enables predictable EMI profile and consistent inductor sizing-avoids variable-frequency jitter and simplifies filter design. |
| ±2% output tolerance | Guaranteed over full line (8–40V), load (100mA–3A), and temperature (–40°C to +125°C)-reduces need for post-regulation LDOs. |
| ON/OFF control with 50µA standby | Allows system-level power sequencing and deep-sleep states without external logic-ideal for energy-conscious embedded designs. |
| Thermal shutdown + current limit | Self-protecting under fault conditions (overload, short-circuit, overheating); recovers automatically after fault removal. |
| WEBENCH® design support | TI's online tool generates complete schematics, bill-of-materials, and performance simulations-accelerates prototyping by >50%. |
Applications
| Communication Module Power | Electricity Meter Supply |
|---|---|
Use Scenario: Provides isolated 3.3V/5V rail for LTE/LoRa modems and RF front-ends in smart grid endpoints. IC Role / Device Role / Timing Role: Primary buck converter generating clean, regulated DC from 12V/24V meter bus. Use Value: 88% efficiency minimizes self-heating inside sealed meter enclosures; 50µA shutdown extends battery backup life. |
Use Scenario: Powers metrology ASIC, RTC, and display in Class 0.5S electricity meters operating continuously for 15+ years. IC Role / Device Role / Timing Role: Main DC/DC regulator converting 24V AC-DC output to stable 5V for precision analog front-end. Use Value: ±2% output tolerance ensures ADC reference stability; thermal shutdown prevents field failures under sustained overload. |
| Motor Drive Auxiliary Rail | Industrial HMI Panel Supply |
Use Scenario: Generates 12V auxiliary power for gate drivers and isolation logic in 3-phase inverter control boards. IC Role / Device Role / Timing Role: Secondary buck stage supplying isolated control circuitry from main DC bus (24–40V). Use Value: 260kHz switching avoids interference with motor PWM frequencies; 3A rating supports multiple isolated supplies. |
Use Scenario: Delivers 5V/3A to ARM-based HMI controllers, touch controllers, and backlight drivers in factory HMIs. IC Role / Device Role / Timing Role: Central point-of-load regulator replacing linear regulators to reduce board temperature rise. Use Value: TO-263-7 package enables direct mounting to metal chassis for passive cooling; no heatsink required below 2.5A. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596SX-ADJ/NOPB | Lower 1.5A output current, 150kHz switching, higher RDS(ON) (220mΩ), wider VIN (4–40V) | Suitable for <2A loads where lower cost and reduced efficiency are acceptable; not recommended for 3A continuous duty. | Select LM2596SX-ADJ/NOPB only if thermal budget allows higher losses or peak load is <2A. |
| LMR51430RNXR | 3A synchronous buck, 4.5–36V input, 500kHz/1.1MHz selectable, integrated high/low-side FETs, 95% efficiency | Requires no external diode; smaller solution size; supports higher-frequency designs but lacks ON/OFF pin hysteresis. | Choose LMR51430RNXR for new designs prioritizing size, efficiency, and synchronous rectification-LM2676SDX-ADJ/NOPB remains preferred for legacy compatibility and diode flexibility. |
Compared with LM2596SX-ADJ/NOPB, LM2676SDX-ADJ/NOPB delivers 100% higher current and 10% higher efficiency; versus LMR51430RNXR, it trades 7% peak efficiency for external diode control, proven reliability in harsh environments, and simpler EMI filtering due to fixed 260kHz frequency.
Availability
LM2676SDX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, smart metering systems, and motor drive auxiliary rails requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LM2676SDX-ADJ/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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2676 series belongs to TI's SIMPLE SWITCHER® portfolio-designed specifically for ease-of-use, minimal external component count, and robust operation in industrial, metering, and communications equipment.
FAQ
What is the maximum output current specification for LM2676SDX-ADJ/NOPB?
The LM2676SDX-ADJ/NOPB is rated for up to 3A continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). Current limit is internally set to typ. 4.5A with cycle-by-cycle protection-actual achievable current depends on input voltage, output voltage, ambient temperature, and heatsinking. At 12VIN/5VOUT, full 3A is sustainable with TO-263-7 mounted on ≥0.4896 in² copper.
Does LM2676SDX-ADJ/NOPB require an external catch diode, and what type is recommended?
Yes, LM2676SDX-ADJ/NOPB requires an external Schottky catch diode connected between the SW pin and GND. TI recommends a 3A-rated, low-VF Schottky diode such as the SS34 or MBR340-selected for fast recovery, low forward voltage (<0.5V), and adequate surge current rating. The diode must be placed adjacent to the SW and GND pins to minimize parasitic inductance.
How is output voltage set on LM2676SDX-ADJ/NOPB, and what tolerance does the feedback reference have?
Output voltage is set using a resistor divider from VOUT to GND, with the midpoint connected to the FB pin. The internal reference is 1.21V ±1.15% over –40°C to +125°C, yielding ±2% total output tolerance across line, load, and temperature. For example, a 5V output uses R1 = 3.16kΩ and R2 = 1.0kΩ (standard 1% values), achieving precise regulation without trimming.
Can LM2676SDX-ADJ/NOPB be synchronized to an external clock?
No, LM2676SDX-ADJ/NOPB does not support external synchronization. It uses an internal fixed-frequency 260kHz oscillator with ±11% tolerance. This simplifies design but means switching frequency cannot be locked to system clocks or other converters-designers must manage potential beat frequencies through careful layout and filtering.
What thermal performance can be expected from LM2676SDX-ADJ/NOPB in the TO-263-7 package?
In the KTW (TO-263-7) package, LM2676SDX-ADJ/NOPB achieves RθJA = 35°C/W with 0.4896 in² (3.6× package area) of 1 oz copper, and 26°C/W with 1.0064 in² (7.4× package area) plus 12 thermal vias. The exposed DAP must be soldered to a solid ground plane-failure to do so degrades thermal performance by >40% and risks thermal shutdown under load.
LM2676SDX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 37V
- 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)
LM2676SDX-ADJ/NOPB FAQ
1.How can I place an order for LM2676SDX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676SDX-ADJ/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 LM2676SDX-ADJ/NOPB reliable?
The price and inventory of LM2676SDX-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2676SDX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2676SDX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676SDX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676SDX-ADJ/NOPB?
LM2676SDX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676SDX-ADJ/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 LM2676SDX-ADJ/NOPB?
For technical support, including LM2676SDX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676SDX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2676SDX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2676SDX-ADJ/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 LM2676SDX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2676SDX-ADJ/NOPB?
All LM2676SDX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2676SDX-ADJ/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 LM2676SDX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2676SDX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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