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Texas Instruments LM2676SX-ADJ/J7001886
- Part No.:
- LM2676SX-ADJ/J7001886
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2676SX-ADJ/J7001886.pdf
- Description:
- IC REG BUCK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,487
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Product details
Overview
LM2676SX-ADJ/J7001886 from Texas Instruments is a monolithic step-down (buck) DC/DC switching regulator IC delivering up to 3A output current with adjustable output voltage (1.2V–37V), 260kHz fixed-frequency operation, 8V–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.
For engineers reviewing the LM2676SX-ADJ/J7001886 datasheet, LM2676SX-ADJ/J7001886 pinout, LM2676SX-ADJ/J7001886 application, or LM2676SX-ADJ/J7001886 equivalent, key selection considerations include its adjustable feedback architecture, thermal shutdown and current limiting protection, TO-263-7 (KTW) package thermal performance, and compatibility with standard off-the-shelf inductors and Schottky diodes in industrial power supply designs.
Technical Context
The LM2676SX-ADJ/J7001886 implements a voltage-mode PWM controller with a fixed 260kHz oscillator and internal 150mΩ DMOS power switch. Its feedback loop uses a two-stage high-gain amplifier referenced to a precise 1.21V internal reference (±1.1% over temperature), enabling stable regulation across 1.2V–37V via external resistor divider.
It operates in continuous conduction mode by default, supports shutdown via logic-level ON/OFF pin (1.4V threshold), and incorporates thermal shutdown, cycle-by-cycle current limiting (typ. 4.5A), and built-in soft-start functionality - all without requiring external compensation components due to internal frequency compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 3A continuous load capability with integrated 150mΩ DMOS switch - eliminates need for external MOSFET in mid-power buck designs. |
| Input Voltage Range | 8V to 40V - supports wide-range industrial and telecom inputs including 12V, 24V, and 36V rails. |
| Output Voltage | Adjustable from 1.2V to 37V via external resistor divider - enables flexible system-level voltage scaling. |
| Feedback Reference | 1.21V ±1.1% over –40°C to +125°C - ensures tight output regulation without trimming or calibration. |
| Switching Frequency | 260kHz ±11% - enables use of compact, standardized inductors while balancing efficiency and EMI. |
| Efficiency | Up to 94% at 12V→5V/3A - achieved via low RDS(on) switch and optimized gate drive architecture. |
| Standby Current | 50µA typical when ON/OFF pin = 0V - supports ultra-low-power sleep modes in battery-backed systems. |
| Thermal Protection | Integrated thermal shutdown with automatic recovery - prevents damage during overload or poor heatsinking. |
Pinout & Package
LM2676SX-ADJ/J7001886 is packaged in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad, measuring 10.1mm × 15.24mm. The package provides low thermal resistance (RθJA = 35°C/W with 0.4896 in² copper) and requires PCB copper area connected to GND for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch Output | Drain node of internal DMOS FET - connects directly to inductor and cathode of external catch diode; switches between VIN and ~–0.4V (Schottky drop). |
| 2 (VIN) | Input Supply | Main power input (8–40V); supplies internal bias and high-side switch - must be bypassed with low-ESR capacitor placed adjacent to pin. |
| 3 (CB) | Bootstrap Capacitor | Connects to SW via 100nF ceramic capacitor - generates gate drive voltage >VIN to fully enhance internal FET and minimize conduction loss. |
| 4 (GND) | Power Ground | Common return path for input/output capacitors, thermal pad, and internal circuitry - requires low-inductance connection to PCB 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 - sets regulated VOUT = 1.21V × (1 + R1/R2); high-impedance (85nA bias) minimizes divider current error. |
| 7 (ON/OFF) | Enable Control | Logic-compatible enable input - ≥1.4V enables regulation; ≤0.8V disables output and reduces quiescent current to 50µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS Switch | Enables single-chip 3A buck conversion without external MOSFET - reduces BOM count and layout complexity. |
| Fixed 260kHz Oscillator | Allows predictable EMI filtering and use of standardized, low-cost inductors - avoids variable-frequency jitter and design uncertainty. |
| ±2% Output Tolerance | Guaranteed over full line, load, and temperature (–40°C to +125°C) - eliminates need for post-production trimming in precision applications. |
| Internal Compensation | Removes requirement for external compensation network - simplifies design and improves stability across all operating conditions. |
| Thermal Shutdown + Current Limit | Protects against fault conditions without external circuitry - ensures robust operation in motor drives, meters, and communication modules. |
| WEBENCH® Design Support | TI's online tool generates complete schematics, BOMs, and performance simulations - accelerates time-to-prototype for LM2676SX-ADJ/J7001886-based supplies. |
Applications
| Communication Module Power | Electricity Meter Supply |
|---|---|
Use Scenario: Powers baseband processor, RF transceiver, and interface ICs in cellular IoT modems operating from 12V or 24V field power. IC Role / Device Role / Timing Role: Primary non-isolated DC/DC converter generating stable 3.3V or 5V rail with fast transient response to burst-mode data transmission loads. Use Value: Delivers 3A peak current with <100mV output deviation during 500mA→3A load steps - maintains modem link integrity and reduces need for oversized bulk capacitance. | Use Scenario: Supplies microcontroller, LCD driver, and metrology ADC in revenue-grade smart electricity meters powered from AC-DC adapter or supercapacitor backup. IC Role / Device Role / Timing Role: Main system regulator providing tightly regulated 3.3V for digital logic and 5V for analog front-end - operates continuously across –25°C to +70°C ambient. Use Value: ±2% output tolerance and –40°C to +125°C junction rating ensure metrology accuracy compliance under extended temperature stress and long-term field deployment. |
| Calling Button Panel | Motor Drive Auxiliary Supply |
Use Scenario: Powers LED indicators, touch sensing circuitry, and wireless transceiver in building intercom panels powered from PoE or 24V DC distribution. IC Role / Device Role / Timing Role: Compact, thermally efficient buck converter delivering 5V/1A from 24V input - mounted on space-constrained front-panel PCB. Use Value: TO-263-7 package with exposed thermal pad achieves 35°C/W θJA on minimal copper - enables fanless operation and eliminates thermal derating in sealed enclosures. | Use Scenario: Generates isolated gate drive and logic supply rails for BLDC motor controllers in HVAC actuators or industrial pumps using 24V or 48V bus. IC Role / Device Role / Timing Role: Non-isolated auxiliary supply powering MCU, gate drivers, and current sense amplifiers - co-located near motor control section. Use Value: Built-in thermal shutdown and cycle-by-cycle current limit prevent latch-up during motor stall or short-circuit events - enhances system reliability without external protection ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596SX-ADJ/NOPB | 3A, 150kHz fixed frequency, higher RDS(on) (220mΩ), wider input (4.5–40V), lower max output (37V same) | Lower switching frequency increases inductor size; less efficient at high IOUT; better for cost-sensitive, lower-EMI designs | Choose for legacy designs where 150kHz EMI profile is preferred or where existing LM2596 layout can be reused with minor component changes. |
| TPS54302DDAR | 3A, 2.5MHz adjustable buck, integrated 100mΩ FETs, smaller 8-pin SO PowerPAD package, requires external compensation | Higher frequency enables tiny 1µH inductors; tighter output ripple; more complex layout and compensation tuning required | Choose for space-constrained applications needing sub-10mm² solution footprint and faster transient response - not drop-in compatible due to different pinout and control architecture. |
Compared with LM2676SX-ADJ/J7001886, LM2596SX-ADJ/NOPB trades efficiency and thermal performance for broader input range and simpler design reuse, while TPS54302DDAR delivers miniaturization and bandwidth at the cost of increased design effort and no pin compatibility.
Availability
LM2676SX-ADJ/J7001886 is available at Aetrix Electronics and suitable for communication modules, electricity meters, calling button operating panels, and motor drives requiring stable component supply, long-lifecycle support, and industrial-grade thermal reliability.
Supply support for LM2676SX-ADJ/J7001886 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, minimal external component count, and robust performance in industrial, metering, and communications power supplies.
FAQ
What is the maximum output voltage achievable with LM2676SX-ADJ/J7001886?
The LM2676SX-ADJ/J7001886 supports an adjustable output voltage range of 1.2V to 37V, set by an external resistor divider connected to the FB pin. This upper limit is constrained by the absolute maximum voltage rating of the FB pin (14V) and internal reference accuracy - exceeding 37V risks violating feedback network voltage limits and degrading regulation stability. Always verify divider resistor power ratings and voltage coefficients for high-VOUT designs.
Does LM2676SX-ADJ/J7001886 require external compensation components?
No, LM2676SX-ADJ/J7001886 features fully internal frequency compensation - no external capacitors or resistors are needed to stabilize the control loop. This simplifies design, reduces BOM count, and ensures consistent performance across input voltage, load, and temperature variations without tuning. The internal compensation is optimized for standard output capacitor ESR ranges used with recommended tantalum or aluminum electrolytic types.
What thermal management is required for LM2676SX-ADJ/J7001886 in continuous 3A operation?
For continuous 3A output at full input range (e.g., 40V→5V), LM2676SX-ADJ/J7001886 requires a minimum 0.4896 in² (3.2 cm²) of 1 oz copper connected to the exposed thermal pad (pin 4/GND) to maintain junction temperature ≤125°C. Without this, thermal derating begins above ~2.2A. Use multiple thermal vias (≥6) under the pad and avoid isolating the pad from the main ground plane - insufficient copper causes rapid thermal shutdown during sustained load.
Can LM2676SX-ADJ/J7001886 be synchronized to an external clock?
No, LM2676SX-ADJ/J7001886 uses a fixed internal 260kHz oscillator with no external synchronization input. Its frequency tolerance is ±11% over temperature and line, and it cannot be locked to or dithered by an external timing source. For synchronized multi-rail systems, consider alternatives like TPS54302DDAR (with SYNC pin) or discrete oscillator-controlled designs - LM2676SX-ADJ/J7001886 prioritizes simplicity over timing coordination.
What is the purpose of the CB pin on LM2676SX-ADJ/J7001886, and what capacitor value is recommended?
The CB (bootstrap capacitor) pin on LM2676SX-ADJ/J7001886 provides gate drive voltage for the internal high-side DMOS switch. A 100nF ceramic capacitor must be placed between CB and SW (pin 1) to generate a voltage ~VIN + 10V, ensuring full enhancement of the FET and minimizing RDS(on)-related losses. X7R or C0G dielectrics are recommended; capacitor voltage rating must exceed VIN + 10V, and placement must be within 3mm of the pins to prevent bootstrap coupling failure or erratic switching.
LM2676SX-ADJ/J7001886 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Bulk
- 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/J7001886 FAQ
1.How can I place an order for LM2676SX-ADJ/J7001886 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676SX-ADJ/J7001886 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/J7001886 reliable?
The price and inventory of LM2676SX-ADJ/J7001886 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/J7001886 is usually 5 days.
3.What payment methods are accepted for LM2676SX-ADJ/J7001886?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676SX-ADJ/J7001886 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676SX-ADJ/J7001886?
LM2676SX-ADJ/J7001886 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676SX-ADJ/J7001886 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/J7001886?
For technical support, including LM2676SX-ADJ/J7001886 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676SX-ADJ/J7001886 requirements.
6.How does Aetrix verify that LM2676SX-ADJ/J7001886 is sourced from the original manufacturer or authorized distributors?
All LM2676SX-ADJ/J7001886 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/J7001886 meets industry standards.
7.What is the process for return or replacement of LM2676SX-ADJ/J7001886?
All LM2676SX-ADJ/J7001886 units undergo pre-shipment inspection (PSI). If there is an issue with LM2676SX-ADJ/J7001886, 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/J7001886 part is unused and in its original packaging.
Return procedure for LM2676SX-ADJ/J7001886:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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