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Texas Instruments LM2676SX-ADJ/NOPB
- Part No.:
- LM2676SX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2676SX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:3,628
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Product details
Overview
LM2676SX-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 to 37V), 260kHz fixed-frequency operation, ±2% output voltage tolerance, 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 LM2676SX-ADJ/NOPB datasheet, LM2676SX-ADJ/NOPB pinout, LM2676SX-ADJ/NOPB application, or LM2676SX-ADJ/NOPB equivalent, key selection criteria include its adjustable feedback architecture, TO-263-7 (KTW) package thermal performance, 50µA standby current, and compatibility with standard off-the-shelf inductors and Schottky diodes in buck topologies.
Technical Context
The LM2676SX-ADJ/NOPB implements a fixed-frequency (260kHz) PWM controller with internal DMOS high-side switch and bootstrap gate drive (CB pin). Its feedback loop uses an external resistor divider referenced to a precise 1.21V VFB threshold, enabling accurate output regulation across line, load, and temperature (–40°C to 125°C).
It operates in continuous conduction mode by default, supports shutdown via logic-level ON/OFF pin (1.4V threshold), and features built-in thermal shutdown and cycle-by-cycle current limiting (typ. 4.5A). The device requires no external compensation due to internal frequency compensation optimized for standard output capacitor ESR ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 3A continuous - supports industrial loads without external current boosting. |
| Input Voltage Range | 8V to 40V - compatible with 12V/24V/36V industrial rails and battery-backed systems. |
| Output Voltage Range | 1.2V to 37V adjustable - set via external resistor divider on FB pin; enables single BOM for multiple output voltages. |
| Feedback Voltage | 1.21V ±1.2% - defines output accuracy; combined with resistor tolerance determines final VOUT error. |
| Switching Frequency | 260kHz ±11% - enables use of compact, low-cost 22–47µH inductors and reduces EMI compared to higher frequencies. |
| Efficiency | Up to 94% - achieved via 150mΩ RDS(ON) DMOS switch and optimized gate drive; minimizes thermal dissipation at full load. |
| Standby Current | 50µA - enables low-power system sleep modes without auxiliary LDOs or external switches. |
Pinout & Package
LM2676SX-ADJ/NOPB is supplied in the KTW (TO-263-7) thermally enhanced surface-mount package (10.1mm × 15.24mm), featuring an exposed thermal pad soldered to PCB ground for optimal heat dissipation in high-current applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch Output | Drain node of internal DMOS FET; connects to inductor and cathode of external catch diode - high dv/dt node requiring short layout. |
| 2 (IN) | Input Supply | Primary power input (8–40V); must be bypassed with low-ESR capacitor placed adjacent to pin for stability and ripple suppression. |
| 3 (CB) | Bootstrap Capacitor | Connects to SW via 100nF ceramic capacitor - provides gate drive voltage > VIN to fully enhance internal FET and minimize conduction loss. |
| 4 (GND) | Power Ground | Main return path for IN, SW, and FB; requires low-impedance connection to thermal pad and system ground plane. |
| 5 (NC) | No Connect | Internally unconnected; must remain floating - no routing or soldering required. |
| 6 (FB) | Feedback Input | Senses output voltage via external resistor divider; 85nA bias current allows high-value resistors to reduce quiescent power draw. |
| 7 (ON/OFF) | Enable Control | Logic-compatible shutdown input; <0.8V disables regulator (50µA ISTBY); >1.4V enables operation; internal 20µA pull-up simplifies interface. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS Switch | Eliminates need for external MOSFET and driver; reduces BOM count and layout complexity while maintaining >90% efficiency at 3A. |
| Fixed 260kHz Oscillator | Enables predictable EMI profile and consistent inductor sizing; avoids frequency jitter issues common in variable-frequency controllers. |
| ±2% Output Voltage Tolerance | Guaranteed over full line, load, and temperature range - ensures reliable downstream circuit operation without post-regulation. |
| Thermal Shutdown + Current Limit | Protects against overload and ambient overheating without external sensing components; auto-recovery after fault clearance. |
| Adjustable Output (1.2V–37V) | Single part number supports wide range of system rails - simplifies inventory and design reuse across product families. |
Applications
| Communication Module Power | Electricity Meter Supply |
|---|---|
Use Scenario: Powers baseband processor, RF transceiver, and isolated RS-485 interface in cellular IoT gateways operating from 12V or 24V field bus. IC Role / Device Role / Timing Role: Primary non-isolated buck converter generating 3.3V or 5V system rail; regulates against input ripple from noisy telecom power sources. Use Value: 50µA standby current enables deep-sleep wake-on-RF functionality; ±2% output tolerance ensures ADC reference stability and UART timing integrity. | Use Scenario: Supplies microcontroller, LCD driver, and metrology ADC in DIN-rail mounted smart electricity meters with 24V AC/DC input. IC Role / Device Role / Timing Role: Main 3.3V/5V power stage converting rectified 24V to low-noise digital and analog rails; withstands wide temperature swings (-25°C to 70°C ambient). Use Value: 8V–40V input range accommodates brownout and surge conditions per IEC 61000-4-5; thermal shutdown prevents failure during enclosure overheating. |
| Calling Button Panel Supply | Motor Drive Auxiliary Rail |
Use Scenario: Powers touch controller, LED indicators, and wireless BLE module in building intercom panels powered from PoE-derived 12V or 24V. IC Role / Device Role / Timing Role: Compact, low-noise buck regulator generating 3.3V for MCU and sensors; operates continuously with intermittent high-current LED bursts. Use Value: TO-263-7 package enables high-current capability in space-constrained enclosures; 260kHz switching avoids audible noise in human-accessible zones. | Use Scenario: Generates isolated 15V gate drive and 5V logic supply for half-bridge IGBT drivers in HVAC blower motor inverters. IC Role / Device Role / Timing Role: Non-isolated pre-regulator feeding isolated DC-DC modules; handles 3A peak loads during motor startup surges. Use Value: 4.5A current limit protects against inrush into capacitive gate-drive networks; 94% efficiency minimizes heat buildup near sensitive motor control ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675MX-ADJ/NOPB | 1.5A output current, same 260kHz frequency and ADJ architecture; smaller SOIC-8 package. | Lower current capacity limits use to sub-2A loads; less thermal margin in enclosed spaces. | Select when board space is constrained and peak load ≤1.5A - avoids overdesign and cost premium of 3A rating. |
| LMR14030SDDAR | 40V-input, 3A synchronous buck with integrated high/low-side FETs; 400kHz–2.1MHz programmable frequency. | Higher efficiency (>95%) and smaller solution size but requires external compensation and has different pinout. | Choose for new designs prioritizing efficiency and footprint; not drop-in - demands layout and loop compensation redesign. |
Compared with LM2676SX-ADJ/NOPB, LM2675MX-ADJ/NOPB offers identical control architecture at reduced current and thermal capability, while LMR14030SDDAR delivers higher integration and efficiency at the cost of design complexity and non-interchangeable layout - making LM2676SX-ADJ/NOPB optimal for proven, thermally demanding 3A applications where simplicity and reliability are critical.
Availability
LM2676SX-ADJ/NOPB is available at Aetrix Electronics and suitable for communication modules, electricity meters, and motor drive auxiliary supplies requiring stable component supply, long-term manufacturability, and industrial-grade thermal performance.
Supply support for LM2676SX-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 technologies, with decades of expertise in high-reliability power conversion ICs.
The LM2676 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use in industrial, metering, and infrastructure applications where robustness, minimal external components, and guaranteed performance over temperature are essential.
FAQ
What is the maximum output current capability of the LM2676SX-ADJ/NOPB?
The LM2676SX-ADJ/NOPB delivers up to 3A of continuous output current under recommended operating conditions (TJ ≤ 125°C, adequate PCB copper area). Its internal current limit is specified at 3.8A–5.25A, providing headroom for transient surges. Actual achievable current depends on input voltage, output voltage, ambient temperature, and thermal design - particularly the KTW package's thermal pad connection to a large ground plane.
How does the feedback pin (FB) of the LM2676SX-ADJ/NOPB determine output voltage?
The LM2676SX-ADJ/NOPB uses a precision 1.21V reference at the FB pin. Output voltage is set by an external resistor divider (R1 from VOUT to FB, R2 from FB to GND) using VOUT = 1.21V × (1 + R1/R2). The FB pin draws only 85nA bias current, allowing high-resistance dividers to minimize quiescent power loss while maintaining regulation accuracy within ±2% over temperature and load.
Can the LM2676SX-ADJ/NOPB operate with an input voltage below 8V?
No - the LM2676SX-ADJ/NOPB has a minimum recommended input voltage of 8V per its absolute operating specifications. Below this, the internal bias circuitry cannot sustain regulation, and the DMOS switch may not fully enhance, leading to excessive conduction loss, thermal runaway, or erratic switching. For lower-input applications, consider TI's LM2674 (5V min) or newer alternatives like the TPS54302.
What is the purpose of the CB pin on the LM2676SX-ADJ/NOPB, and what capacitor value is required?
The CB (bootstrap capacitor) pin on the LM2676SX-ADJ/NOPB provides gate drive voltage above VIN to fully turn on the internal high-side DMOS switch. A 100nF ceramic capacitor must be connected between CB and SW (pin 1). This capacitor charges during the low-side conduction phase and supplies the gate charge needed for high-side enhancement - critical for achieving low RDS(ON) and high efficiency. X7R or C0G dielectrics are recommended for stability.
Does the LM2676SX-ADJ/NOPB require external compensation components?
No - the LM2676SX-ADJ/NOPB features fully internal frequency compensation optimized for standard output capacitor ESR values (e.g., 26mΩ tantalum or aluminum electrolytic). No external RC networks or compensation pins are needed. This simplifies design and eliminates tuning effort, aligning with the SIMPLE SWITCHER® philosophy of minimal external components for reliable buck conversion.
LM2676SX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- 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:
- TO-263 (DDPAK-7)
LM2676SX-ADJ/NOPB FAQ
1.How can I place an order for LM2676SX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676SX-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 LM2676SX-ADJ/NOPB reliable?
The price and inventory of LM2676SX-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 LM2676SX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2676SX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676SX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676SX-ADJ/NOPB?
LM2676SX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676SX-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 LM2676SX-ADJ/NOPB?
For technical support, including LM2676SX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676SX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2676SX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2676SX-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 LM2676SX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2676SX-ADJ/NOPB?
All LM2676SX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2676SX-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 LM2676SX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2676SX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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