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Texas Instruments LM2676SDX-3.3/NOPB
- Part No.:
- LM2676SDX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2676SDX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,782
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Product details
Overview
LM2676SDX-3.3/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering up to 3A output current with fixed 3.3V output, 8–40V input range, 260kHz fixed-frequency operation, and ±2% output voltage tolerance over –40°C to 125°C junction temperature. It integrates a 150mΩ DMOS high-side switch and supports ON/OFF control for low-power standby mode in industrial power supplies.
For engineers reviewing the LM2676SDX-3.3/NOPB datasheet, LM2676SDX-3.3/NOPB pinout, LM2676SDX-3.3/NOPB application, or LM2676SDX-3.3/NOPB equivalent, key selection criteria include verified 3.3V fixed-output regulation accuracy, thermal performance in TO-263 (KTW) package, 50µA shutdown quiescent current, and compatibility with standard off-the-shelf inductors and Schottky diodes per TI's recommended design flow.
Technical Context
The LM2676SDX-3.3/NOPB implements a voltage-mode PWM controller with a fixed 260kHz internal oscillator and integrated 150mΩ DMOS high-side switch. Its feedback loop uses an internal resistor divider for 3.3V regulation, eliminating external resistors - unlike adjustable versions requiring FB pin connection to output.
It operates in continuous conduction mode (CCM) across full load range (100mA–3A), features built-in thermal shutdown and cycle-by-cycle current limiting (3.6–5.4A trip range), and transitions to 50µA standby mode when ON/OFF pin is pulled below 0.8V - enabling precise system-level power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2% (3.234–3.366V at 25°C; 3.201–3.399V over –40°C to 125°C) |
| Max Output Current | 3A continuous - supports industrial loads without external current boosting |
| Input Voltage Range | 8V to 40V - compatible with 12V/24V industrial rails and battery-backed systems |
| Switching Frequency | 260kHz ±11% - enables use of compact, standardized 33µH inductors and reduces EMI filtering burden |
| Efficiency | 86% typical at VIN=12V, IOUT=3A - minimizes thermal rise in enclosed enclosures |
| Quiescent Current | 4.2–6mA active mode; 50–100µA shutdown - enables low-power sleep states in metering and IoT edge nodes |
| RDS(ON) | 0.15–0.17Ω (25°C); max 0.29Ω (–40°C to 125°C) - defines conduction loss and thermal headroom at full load |
Pinout & Package
LM2676SDX-3.3/NOPB is supplied in the KTW (TO-263-7) thermally enhanced surface-mount package (10.1mm × 15.24mm), featuring an exposed thermal pad (DAP) connected internally to GND for PCB heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch Output | Drain node of internal DMOS FET - connects directly to inductor and cathode of external Schottky diode; switches between VIN and ~–0.4V during OFF state |
| 2 (VIN) | Input Supply | Main power input (8–40V); requires low-ESR ceramic + bulk capacitor placed <2mm from pin to minimize switching noise and voltage spikes |
| 3 (CB) | Bootstrap Capacitor | Connects to SW via 100nF ceramic capacitor - generates gate drive voltage >VIN to fully enhance internal high-side FET |
| 4 (GND) | Power Ground | Primary return path for VIN, SW, and FB; must be tied to large copper pour and DAP for thermal and EMI control |
| 5 (NC) | No Connect | Internally unconnected - must remain floating; no routing or solder mask opening required |
| 6 (FB) | Feedback Input | Internally tied to 3.3V divider - connect directly to output capacitor for fixed-output regulation; no external resistors needed |
| 7 (ON/OFF) | Enable Control | Logic-level input: ≥1.4V = ON, ≤0.8V = OFF; internal 20µA pull-up allows simple microcontroller GPIO control without external bias |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS Switch | Enables single-chip 3A buck conversion without external MOSFETs - reduces BOM count and layout complexity |
| Fixed 3.3V Output with ±2% Tolerance | Eliminates external feedback resistors and associated drift/error sources - improves long-term output stability in metering applications |
| 260kHz Fixed-Frequency Operation | Allows predictable EMI filtering and use of TI-recommended off-the-shelf inductors (e.g., Renco RLF7030), simplifying qualification |
| 50µA Shutdown Quiescent Current | Supports ultra-low-power wake-on-event architectures in electricity meters and remote sensors without auxiliary LDOs |
| Built-in Thermal Shutdown & Current Limit | Protects against overload and ambient overheating without external sensing circuitry - ensures robust field reliability |
Applications
| Communication Module Power | Electricity Meter Auxiliary Rail |
|---|---|
Use Scenario: Powers baseband processor, RF transceiver, and memory in cellular/Wi-Fi communication modules operating from 12V or 24V industrial bus. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator supplying core logic and interface I/O; delivers stable rail despite input ripple from noisy switching PSUs. Use Value: 86% efficiency at 3A reduces heatsink requirements; ±2% output tolerance ensures reliable ADC reference and UART timing margins. | Use Scenario: Generates isolated 3.3V supply for metrology SoC, RTC, and tamper-detection circuitry in DIN-rail electricity meters. IC Role / Device Role / Timing Role: Main auxiliary power converter - activated only during measurement cycles via ON/OFF pin to extend battery backup life. Use Value: 50µA shutdown current extends CR2032 coin-cell life beyond 10 years; wide 8–40V input accommodates degraded battery or rectified AC inputs. |
| Calling Button Panel Supply | Motor Drive Logic Power |
Use Scenario: Provides regulated 3.3V for microcontroller, LED drivers, and touch-sensing circuitry in building intercom and elevator call panels. IC Role / Device Role / Timing Role: Standalone buck converter accepting 24V PoE-derived or wall-adapter input; withstands repeated inrush from capacitive touch screens. Use Value: Integrated current limit (3.6–5.4A) prevents latch-up during screen capacitance charging; TO-263 package enables direct heatsinking to metal enclosure. | Use Scenario: Supplies gate driver ICs, position encoder interfaces, and MCU logic in 24V DC motor drives for HVAC and industrial automation. IC Role / Device Role / Timing Role: Secondary power rail generator - immune to voltage dips caused by motor commutation transients on main 24V bus. Use Value: 260kHz switching frequency avoids interference with encoder clock domains; 125°C max junction rating supports operation near hot motor windings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675SDX-3.3/NOPB | 1.5A output current; same 260kHz frequency, 3.3V fixed output, and TO-263 package | Suitable only for sub-2A loads - insufficient for full 3A motor drive logic or multi-core SoCs | Select when thermal budget or cost constraints preclude 3A capability and peak load remains ≤1.5A |
| LMR51430RNXR | 3A synchronous buck with 4.5–36V input, 500kHz/1.1MHz selectable frequency, and integrated high-/low-side MOSFETs | Higher efficiency (>92% typical), smaller solution size, but requires external compensation and lacks ON/OFF pin clamp protection | Choose for new designs prioritizing footprint reduction and efficiency over legacy pin compatibility and robustness in harsh environments |
Compared with LM2676SDX-3.3/NOPB, LM2675SDX-3.3/NOPB offers identical topology and layout but halved current capacity, while LMR51430RNXR delivers higher integration and efficiency at the cost of design complexity and reduced fault tolerance - making LM2676SDX-3.3/NOPB optimal for proven, ruggedized 3A industrial power rails.
Availability
LM2676SDX-3.3/NOPB is available at Aetrix Electronics and suitable for electricity metering, industrial motor control, building automation panels, and communication module power conversion requiring stable component supply and long-term manufacturability.
Supply support for LM2676SDX-3.3/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 industrial and automotive power solutions.
The LM2676 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use in cost-sensitive, thermally constrained industrial power supplies where minimal external components and proven reliability outweigh cutting-edge efficiency or integration.
FAQ
What is the maximum junction temperature specification for LM2676SDX-3.3/NOPB?
The LM2676SDX-3.3/NOPB has a specified operating junction temperature range of –40°C to 125°C. This rating is validated across all electrical parameters in the datasheet, including output voltage tolerance, efficiency, and current limit. Thermal derating begins above 125°C, triggering internal thermal shutdown to protect the device. The TO-263 package's low RθJC (2°C/W) enables sustained 3A operation with proper PCB copper area.
Does LM2676SDX-3.3/NOPB require external feedback resistors?
No, LM2676SDX-3.3/NOPB does not require external feedback resistors. It is a fixed-output variant with internal resistor divider network configured for 3.3V regulation. Pin 6 (FB) must be connected directly to the output capacitor's positive terminal - no external components are needed. This eliminates resistor tolerance errors and temperature drift, contributing to the ±2% output voltage accuracy over line, load, and temperature.
What is the purpose of the CB pin on LM2676SDX-3.3/NOPB?
The CB (bootstrap capacitor) pin on LM2676SDX-3.3/NOPB connects to a 100nF ceramic capacitor between CB and SW (pin 1). This capacitor provides the gate drive voltage boost necessary to fully enhance the internal high-side DMOS FET above VIN, ensuring low RDS(ON) and high efficiency. Without this capacitor, the high-side switch cannot turn on properly, resulting in no output regulation or excessive heating.
Can LM2676SDX-3.3/NOPB operate with an input voltage lower than 8V?
No, LM2676SDX-3.3/NOPB is not specified to operate below 8V input. The absolute minimum recommended input voltage is 8V per Section 5.3 of the datasheet. Below this, internal bias circuitry may fail to start or sustain regulation, and the 260kHz oscillator may become unstable. Attempting operation at 5V or 6V will result in erratic output or complete dropout - a dedicated low-input buck (e.g., TPS54302) is required for sub-8V applications.
How does the ON/OFF pin function on LM2676SDX-3.3/NOPB?
The ON/OFF pin (pin 7) on LM2676SDX-3.3/NOPB controls device enable state: voltage ≥1.4V enables regulation; voltage ≤0.8V forces shutdown with 50–100µA quiescent current. An internal 20µA pull-up allows direct connection to a microcontroller GPIO (open-drain or push-pull). No external pull-up is needed. The pin includes a 7V Zener clamp to protect against overvoltage - critical in noisy industrial environments.
LM2676SDX-3.3/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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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-3.3/NOPB FAQ
1.How can I place an order for LM2676SDX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676SDX-3.3/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-3.3/NOPB reliable?
The price and inventory of LM2676SDX-3.3/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-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2676SDX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676SDX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676SDX-3.3/NOPB?
LM2676SDX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676SDX-3.3/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-3.3/NOPB?
For technical support, including LM2676SDX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676SDX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2676SDX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2676SDX-3.3/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-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2676SDX-3.3/NOPB?
All LM2676SDX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2676SDX-3.3/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-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2676SDX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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