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Texas Instruments LM2676SDX-ADJ
- Part No.:
- LM2676SDX-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2676SDX-ADJ.pdf
- Description:
- IC REG BUCK ADJ 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,178
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Product details
Overview
LM2676SDX-ADJ 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 over line/load/temperature, 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 datasheet, LM2676SDX-ADJ pinout, LM2676SDX-ADJ application, or LM2676SDX-ADJ 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 LM2676SDX-ADJ implements a voltage-mode PWM controller with a fixed 260kHz oscillator and internal high-side DMOS FET. Its feedback loop senses output voltage via an external resistor divider connected to the FB pin, enabling precise regulation across 1.2V–37V. The device operates in continuous conduction mode (CCM) at full load and transitions to discontinuous mode (DCM) under light loads.
It features integrated protection including current-limiting (3.6A–5.4A over temperature), thermal shutdown, and undervoltage lockout. The ON/OFF pin provides logic-level enable control with 0.8V–2.0V threshold and 20µA input bias, while the CB pin supports bootstrap gate drive for efficient high-side switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | Up to 3A continuous - supports industrial loads such as motor drivers and communication modules without external current boosting. |
| Input Voltage Range | 8V to 40V - compatible with 12V/24V industrial rails and wide-range unregulated supplies. |
| Output Voltage Range | Adjustable from 1.2V to 37V via external resistor divider - enables flexible system-level rail generation. |
| Feedback Reference Voltage | 1.21V ±1.2% - sets output accuracy; combined with external resistors determines final VOUT tolerance. |
| Switching Frequency | 260kHz ±11% - enables use of compact, low-cost magnetics and reduces EMI compared to higher-frequency alternatives. |
| RDS(ON) | 0.15Ω typical - minimizes conduction loss and supports >90% efficiency at 3A (e.g., 88% at 12VIN/5VOUT). |
| Standby Current | 50µA max - allows ultra-low-power shutdown in battery-backed or energy-sensitive systems. |
Pinout & Package
LM2676SDX-ADJ is supplied in the KTW (TO-263-7) package: thermally enhanced 7-pin surface-mount variant with exposed DAP (die attach pad) tied to GND, measuring 10.1mm × 15.24mm. The DAP must be soldered to a PCB ground plane for optimal thermal performance (RθJA ≈ 35°C/W with 0.4896 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch Output | High-side DMOS drain node - connects directly to inductor and cathode of external Schottky diode; switches between VIN and ~–0.5V during OFF time. |
| 2 (VIN) | Input Supply | Main power input - requires low-ESR bypass capacitor placed adjacent to pin; path to GND must be minimal inductance. |
| 3 (CB) | Bootstrap Capacitor | Connects to SW via 100nF ceramic capacitor - generates gate drive voltage >VIN to fully enhance internal MOSFET. |
| 4 (GND) | Power Ground | Primary return path for input/output capacitors and IC substrate - must be tied to large copper area and DAP. |
| 5 (NC) | No Connect | Internally unused - must remain floating; no routing or thermal connection required. |
| 6 (FB) | Feedback Input | Senses output voltage via resistor divider - sets regulated VOUT = 1.21V × (1 + R1/R2); high-impedance (85nA bias) for minimal divider loading. |
| 7 (ON/OFF) | Enable Control | Logic-level shutdown input - <0.8V disables regulator (50µA IQ); >1.4V enables switching; internal 20µA pull-up allows open-circuit operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ High-Side DMOS Switch | Eliminates need for external MOSFET and driver - reduces BOM count and layout complexity in buck converters. |
| Fixed 260kHz Oscillator | Enables predictable EMI profile and simplifies filter design - avoids frequency jitter and allows consistent inductor sizing. |
| ±2% Output Voltage Tolerance | Guaranteed across –40°C to 125°C junction temperature, full line/load - ensures reliable system-level voltage margining without post-regulation. |
| Thermal Shutdown & Current Limit | Protects against overload and ambient overheating - automatically recovers after fault removal; no latch-up or manual reset required. |
| WEBENCH® Power Designer Support | Generates complete schematics, BOMs, and performance simulations - accelerates design validation for LM2676SDX-ADJ-based supplies. |
Applications
| Industrial Motor Drives | Smart Electricity Meters |
|---|---|
Use Scenario: Powering microcontroller, ADC, and isolated RS-485 transceivers in AC-fed metering units with wide input variation. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator generating stable 3.3V/5V rails from rectified 12–36V DC bus. Use Value: 8V–40V input range accommodates brownout and surge conditions; 50µA shutdown extends battery backup runtime during mains failure. | Use Scenario: Providing clean, regulated supply to metrology ASIC and real-time clock in Class 0.5S electricity meters. IC Role / Device Role / Timing Role: Adjustable-output buck converter set to 2.5V or 3.3V for precision analog front-end and low-noise digital core. Use Value: ±2% output tolerance ensures accurate ADC reference stability; thermal shutdown prevents drift-induced measurement error at elevated ambient temperatures. |
| Communication Module Power | Calling Button Operating Panel |
Use Scenario: Converting 24V PoE-derived rail to 3.3V for LTE/Wi-Fi SoC and RF front-end in remote IoT gateways. IC Role / Device Role / Timing Role: High-current, high-efficiency step-down regulator supporting burst-mode transmission peaks up to 2.5A. Use Value: 3A capability and 88% efficiency at 12VIN/5VOUT minimize thermal stress on compact PCBs; fixed 260kHz frequency eases conducted EMI filtering. | Use Scenario: Powering LED indicators, tactile buttons, and low-power MCU in building intercom panels powered from 12–24V HVAC distribution lines. IC Role / Device Role / Timing Role: Compact, cost-optimized buck regulator delivering 5V or adjustable rail with ON/OFF control synchronized to user interface activity. Use Value: TO-263-7 package enables high power density; 0.8V ON/OFF threshold allows direct interfacing with GPIOs without level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596SX-ADJ | Lower 1.5A output current, 150kHz switching frequency, higher RDS(ON) (~0.22Ω), wider VOUT adjust range (1.2V–37V) | Better suited for lower-power, cost-sensitive designs where thermal headroom is limited | Select when 3A peak load is not required and board space allows larger inductors due to lower frequency. |
| LMR51430RGER | 3A synchronous buck, 4.5V–36V input, 500kHz/1.1MHz selectable frequency, integrated high/low-side FETs, 95% efficiency | Requires no external diode; supports smaller magnetics and higher power density; lacks adjustable VOUT down to 1.2V (min 0.8V) | Choose for new designs prioritizing efficiency, size, and simplified layout - but verify if 0.8V minimum VOUT meets system requirements. |
Compared with LM2676SDX-ADJ, LM2596SX-ADJ offers lower cost and simpler thermal management at reduced current capability, while LMR51430RGER delivers higher integration and efficiency at the expense of adjustable-range flexibility and legacy design compatibility.
Availability
LM2676SDX-ADJ is available at Aetrix Electronics and suitable for industrial motor drives, smart electricity meters, and communication module power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2676SDX-ADJ 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 non-isolated DC-DC buck applications where robustness, wide input range, and minimal external components are critical.
FAQ
What is the maximum output current supported by the LM2676SDX-ADJ?
The LM2676SDX-ADJ delivers up to 3A of continuous output current under proper thermal conditions - verified across –40°C to 125°C junction temperature with adequate PCB copper area. Peak current limit is 3.6A–5.4A depending on temperature, and sustained 3A operation requires the KTW package mounted on ≥0.4896 in² of 1 oz copper for thermal reliability. Derating applies above 85°C ambient.
How does the feedback pin (FB) function in the LM2676SDX-ADJ?
The FB pin of the LM2676SDX-ADJ senses the output voltage through an external resistor divider and compares it to an internal 1.21V reference. Regulation is achieved by adjusting the duty cycle to maintain VFB = 1.21V, so VOUT = 1.21V × (1 + R1/R2). The pin draws only 85nA bias current, minimizing divider power loss and enabling high-resistance networks for low quiescent current designs.
Can the LM2676SDX-ADJ operate with an input voltage below 8V?
No - the LM2676SDX-ADJ has a specified minimum input voltage of 8V per its Recommended Operating Conditions. Operation below 8V may result in dropout, unstable regulation, or failure to start. The absolute maximum rating is 45V, and the device includes undervoltage lockout that disables switching until VIN exceeds ~7.5V. For sub-8V inputs, consider alternative regulators such as the LM2596 or TPS5430.
What package type is used for the LM2676SDX-ADJ, and why does it matter?
The LM2676SDX-ADJ uses the KTW (TO-263-7) package - a thermally enhanced surface-mount variant with an exposed die attach pad (DAP) tied to GND. This package achieves RθJA ≈ 35°C/W with 0.4896 in² copper, significantly better than TO-220 alternatives. Proper DAP soldering to a ground plane is essential for thermal performance and long-term reliability at 3A loads.
Does the LM2676SDX-ADJ require an external Schottky diode, and what are the key selection criteria?
Yes - the LM2676SDX-ADJ requires an external Schottky diode connected from SW (pin 1) to GND. Key selection criteria include: average forward current ≥3A, peak repetitive reverse voltage ≥VIN(max), low forward voltage (<0.5V at 3A) to minimize loss, and fast recovery (<100ns). Recommended types include SS34, SB540, or equivalent; placement must minimize loop area to reduce EMI and voltage spikes.
LM2676SDX-ADJ 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:
- 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 FAQ
1.How can I place an order for LM2676SDX-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676SDX-ADJ 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 reliable?
The price and inventory of LM2676SDX-ADJ 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 is usually 5 days.
3.What payment methods are accepted for LM2676SDX-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676SDX-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676SDX-ADJ?
LM2676SDX-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676SDX-ADJ 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?
For technical support, including LM2676SDX-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676SDX-ADJ requirements.
6.How does Aetrix verify that LM2676SDX-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2676SDX-ADJ 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 meets industry standards.
7.What is the process for return or replacement of LM2676SDX-ADJ?
All LM2676SDX-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2676SDX-ADJ, 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 part is unused and in its original packaging.
Return procedure for LM2676SDX-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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