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Texas Instruments LM2676SD-ADJ
- Part No.:
- LM2676SD-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2676SD-ADJ.pdf
- Description:
- IC REG BUCK ADJ 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,875
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Product details
Overview
LM2676SD-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–37V), 260kHz fixed-frequency operation, ±2% output voltage tolerance, and 8V–40V input range - used in industrial power supplies and embedded system rails.
For engineers reviewing the LM2676SD-ADJ datasheet, LM2676SD-ADJ pinout, LM2676SD-ADJ application, or LM2676SD-ADJ equivalent, key selection criteria include its 150mΩ internal DMOS switch, 50µA shutdown quiescent current, thermal shutdown protection, feedback bias current of 85nA, and compatibility with standard off-the-shelf inductors and Schottky diodes.
Technical Context
The LM2676SD-ADJ implements a fixed-frequency PWM controller with an integrated high-side DMOS power switch, bootstrapped gate drive (via CB pin), and internal compensation. Its 260kHz oscillator enables predictable EMI filtering and supports continuous/discontinuous conduction modes across 100mA–3A load range.
Feedback regulation uses a precision 1.21V reference (VFB = 1.186–1.234V) sensed at the FB pin, with 85nA input bias current enabling high-resistance resistor dividers. Shutdown is controlled via ON/OFF pin with 0.8–2.0V threshold and 20µA input leakage, reducing total supply current to 50µA in standby.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | Up to 3A continuous - supports mid-power industrial loads without external MOSFETs. |
| Input voltage range | 8V to 40V - compatible with 12V/24V/36V industrial bus rails and battery-backed systems. |
| Output voltage range | 1.2V to 37V (adjustable) - set by external resistor divider on FB pin; enables flexible rail generation. |
| Switch RDS(ON) | 0.15Ω typical - minimizes conduction loss and enables >90% efficiency at full load. |
| Oscillator frequency | 260kHz ±11% - fixed timing simplifies EMI filter design and allows use of compact magnetics. |
| Feedback reference | 1.21V ±1.2% - high-accuracy reference ensures stable output under line/load/temperature variation. |
| Shutdown current | 50µA max - enables low-power sleep modes in battery-operated or energy-sensitive systems. |
| Thermal protection | Integrated junction thermal shutdown - prevents damage during overload or poor heatsinking. |
Pinout & Package
LM2676SD-ADJ is packaged in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad, measuring 10.1mm × 15.24mm. The package supports high-current thermal dissipation when soldered to a PCB copper area ≥0.4896 in² (3.6× package area).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal high-side DMOS FET; connects to inductor and cathode of external catch diode - carries high dv/dt switching waveform. |
| 2 (IN) | Input supply | Main power input (8–40V); must be bypassed with low-ESR capacitor placed adjacent to pin for stable high-frequency operation. |
| 3 (CB) | Bootstrap capacitor | Connects to SW pin via 100nF ceramic capacitor - provides gate drive voltage above VIN to fully enhance internal FET. |
| 4 (GND) | Power ground | Primary return path for input/output capacitors and internal circuitry; requires low-inductance connection to PCB ground plane. |
| 5 (NC) | No connect | Internally unconnected; must remain floating - no routing or soldering permitted. |
| 6 (FB) | Feedback sense | High-impedance input (85nA bias) monitoring output voltage divider - sets regulated VOUT = 1.21V × (1 + R1/R2). |
| 7 (ON/OFF) | Enable control | Logic-level shutdown input (0.8–2.0V threshold); pulls to GND to disable regulator and reduce IQ to 50µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS switch | Eliminates need for external high-side MOSFET and driver, reducing BOM count and layout complexity. |
| Fixed 260kHz switching frequency | Enables consistent EMI profile and predictable inductor sizing using TI-recommended standard parts. |
| ±2% output voltage tolerance | Ensures tight regulation across –40°C to 125°C junction temperature and full line/load conditions. |
| 50µA shutdown quiescent current | Supports ultra-low-power system states without requiring external load switches or LDOs. |
| Built-in thermal shutdown & current limit | Provides autonomous fault protection (ICL = 3.8–5.25A) without external sensing circuitry. |
| WEBENCH® Power Designer support | Enables complete schematic generation, component selection, and performance simulation directly from TI's online tool. |
Applications
| Industrial Power Rails | Motor Drive Auxiliary Supply |
|---|---|
|
Use Scenario: Providing stable 5V/12V/15V bias rails for PLC I/O modules, sensor interfaces, and communication peripherals in factory automation cabinets. IC Role / Device Role / Timing Role: Primary buck regulator converting 24V DC bus to isolated logic/microcontroller rails with minimal external components. Use Value: Delivers 3A output with <1% load regulation and built-in thermal protection - eliminates need for discrete FETs and reduces board space vs. controller+MOSFET solutions. |
Use Scenario: Generating clean 3.3V or 5V supply for gate drivers, position encoders, and MCU subsystems within brushless DC motor drives. IC Role / Device Role / Timing Role: Secondary regulated supply decoupled from noisy main inverter stage; operates continuously during motor commutation. Use Value: 260kHz fixed frequency avoids interference with motor PWM carrier (typically 8–20kHz), while 50µA shutdown enables firmware-controlled power gating. |
| Electricity Meter Power Management | Communication Module DC-DC Conversion |
|
Use Scenario: Converting wide-range AC-derived DC (12–40V) to precise 3.3V for metrology SoCs and real-time clocks in smart electricity meters. IC Role / Device Role / Timing Role: High-accuracy adjustable buck converter maintaining ±2% output despite input ripple and temperature drift. Use Value: 1.21V internal reference and low FB bias current enable stable voltage setting over lifetime - critical for meter calibration integrity. |
Use Scenario: Stepping down 12V vehicle or PoE-derived input to 3.3V/5V for LTE/Wi-Fi modules, RF transceivers, and baseband processors. IC Role / Device Role / Timing Role: Compact, thermally robust DC-DC stage meeting automotive-grade transient immunity and thermal cycling requirements. Use Value: TO-263 package with exposed pad ensures reliable operation at 125°C ambient - validated for extended life in sealed communication enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596-ADJ | Lower 1.5A output current, 150kHz switching frequency, higher RDS(ON) (0.22Ω), wider VIN (4–40V) | Suitable for lower-power designs where size/efficiency less critical; lacks thermal shutdown flag output | Choose LM2596-ADJ only if 3A capability is unnecessary and cost sensitivity outweighs efficiency needs. |
| LMR51430RNXR | 3A synchronous buck, 4.5–36V input, 500kHz/1.1MHz selectable frequency, integrated high/low-side FETs, 95% peak efficiency | Requires no external diode; smaller solution size; supports dynamic frequency scaling for light-load optimization | Select LMR51430RNXR when upgrading for higher efficiency, reduced BOM, or tighter EMI control - but verify PCB redesign for QFN-12 package. |
Compared with LM2676SD-ADJ, LM2596-ADJ offers lower cost at reduced current and thermal capability, while LMR51430RNXR delivers superior efficiency and integration at the expense of pinout incompatibility and new layout requirements.
Availability
LM2676SD-ADJ is available at Aetrix Electronics and suitable for industrial power rails, motor drive auxiliary supplies, and electricity meter power management requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM2676SD-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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2676 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use in cost-sensitive, medium-power DC-DC applications where minimal external components and proven reliability are essential.
FAQ
What is the maximum output current capability of the LM2676SD-ADJ?
The LM2676SD-ADJ delivers up to 3A of continuous output current under recommended operating conditions (TJ ≤ 125°C, adequate PCB copper area). Current limit is internally set between 3.8A and 5.25A, with thermal shutdown activating if junction temperature exceeds safe limits. Actual achievable current depends on input voltage, output voltage, ambient temperature, and PCB thermal design.
How do I configure the output voltage for LM2676SD-ADJ?
The LM2676SD-ADJ output voltage is set externally using a resistor divider connected between VOUT, FB, and GND. With a precise 1.21V internal reference at the FB pin, VOUT = 1.21V × (1 + R1/R2). For example, R1 = 10kΩ and R2 = 1.24kΩ yields ~11.4V. Resistor values should minimize FB bias current error (<85nA) and maintain stability per TI's application guidelines.
Does LM2676SD-ADJ require an external catch diode?
Yes, the LM2676SD-ADJ requires an external Schottky diode connected from the SW pin (Pin 1) to GND. This diode provides the freewheeling path for inductor current when the internal high-side DMOS switch is OFF. TI recommends diodes with low forward voltage (≤0.5V) and fast recovery (≤50ns), such as the SS34 or MBR340, rated for ≥3A average current and ≥40V PIV.
What thermal considerations apply to LM2676SD-ADJ in TO-263 (KTW) package?
In the KTW package, LM2676SD-ADJ achieves RθJA ≈ 35°C/W with 0.4896 in² (3.6× package) copper area, and ≈26°C/W with 1.0064 in² (7.4× package) copper plus thermal vias. The exposed thermal pad must be soldered to a solid ground plane. Junction temperature must stay ≤125°C; derate output current if ambient exceeds 85°C or copper area is insufficient.
Can LM2676SD-ADJ operate with input voltage below 8V?
No - the absolute minimum recommended input voltage for LM2676SD-ADJ is 8V. Operation below this level may prevent proper gate drive bootstrap charging and cause erratic regulation or failure to start. The device's absolute maximum input rating is 45V, but sustained operation above 40V risks reliability degradation. Always maintain VIN within 8V–40V for guaranteed functionality.
LM2676SD-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)
LM2676SD-ADJ FAQ
1.How can I place an order for LM2676SD-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676SD-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 LM2676SD-ADJ reliable?
The price and inventory of LM2676SD-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2676SD-ADJ is usually 5 days.
3.What payment methods are accepted for LM2676SD-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676SD-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676SD-ADJ?
LM2676SD-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676SD-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 LM2676SD-ADJ?
For technical support, including LM2676SD-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676SD-ADJ requirements.
6.How does Aetrix verify that LM2676SD-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2676SD-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 LM2676SD-ADJ meets industry standards.
7.What is the process for return or replacement of LM2676SD-ADJ?
All LM2676SD-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2676SD-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 LM2676SD-ADJ part is unused and in its original packaging.
Return procedure for LM2676SD-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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