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Texas Instruments LM2676S-3.3/NOPB
- Part No.:
- LM2676S-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2676S-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:622
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Product details
Overview
LM2676S-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.
For engineers reviewing the LM2676S-3.3/NOPB datasheet, LM2676S-3.3/NOPB pinout, LM2676S-3.3/NOPB application, or LM2676S-3.3/NOPB equivalent, key selection criteria include its 3.3V fixed output accuracy, thermal shutdown and current limiting protection, 50µA standby quiescent current, and compatibility with standard off-the-shelf inductors and Schottky diodes in TO-263-7 (KTW) package.
Technical Context
The LM2676S-3.3/NOPB implements a voltage-mode PWM controller with internal 260kHz oscillator and integrated 150mΩ DMOS power switch. Its feedback loop uses direct connection of FB pin to output for fixed-voltage regulation, eliminating external resistors. The device operates in continuous conduction mode at full load and transitions to discontinuous mode under light loads.
Functional modes include active regulation (ON/OFF ≥ 1.4V) and shutdown (ON/OFF ≤ 0.8V), drawing only 50µA supply current in standby. Protection features include cycle-by-cycle current limiting (3.6–5.4A), thermal shutdown, and built-in soft-start via internal timing capacitor.
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 motor drives and communication modules without external current boosting |
| Input Voltage Range | 8V to 40V - compatible with 12V/24V industrial rails and unregulated AC-DC front-ends |
| Switching Frequency | 260kHz ±11% - enables use of compact, standardized 33µH inductors and reduces EMI compared to lower frequencies |
| Efficiency | 86% typical at 12VIN/3A - achieved via low RDS(ON) (0.15–0.29Ω) DMOS switch and optimized gate drive |
| Quiescent Current | 6mA typical operating / 50µA standby - enables low-power sleep states in battery-backed systems |
| Thermal Protection | Integrated thermal shutdown - disables output above safe junction temperature (125°C max operating) |
Pinout & Package
LM2676S-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 soldered to PCB ground plane 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 Schottky diode - carries high dv/dt switching waveform |
| 2 (VIN) | Input Supply | Main power input (8–40V); requires low-ESR bypass capacitor placed adjacent to minimize high-frequency ringing |
| 3 (CB) | Bootstrap Capacitor | Connects to SW via 100nF ceramic capacitor to generate gate drive voltage > VIN for full FET enhancement |
| 4 (GND) | Power Ground | Primary return path for input/output capacitors and thermal pad; must be low-inductance connection to system ground |
| 5 (NC) | No Connect | Internally unconnected; no electrical function - leave floating or tie to GND per layout best practice |
| 6 (FB) | Feedback Input | Direct connection to 3.3V output (no resistor divider needed); senses regulated voltage for error amplifier control |
| 7 (ON/OFF) | Enable Control | Logic-level input: ≥1.4V = ON, ≤0.8V = OFF; internal 20µA pull-up allows simple open-drain or microcontroller GPIO control |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS Switch | Enables 3A output without external MOSFET; reduces BOM count and layout complexity in space-constrained designs |
| Fixed 3.3V Output Configuration | Eliminates external feedback resistors - improves accuracy, reduces drift, and simplifies qualification for safety-critical applications |
| 260kHz Fixed-Frequency Operation | Ensures predictable EMI profile and enables consistent filter design using industry-standard inductor families |
| 50µA Standby Quiescent Current | Supports ultra-low-power system sleep modes while retaining fast wake-up capability (<100µs startup time) |
| Built-in Thermal Shutdown & Current Limit | Provides autonomous fault recovery without external monitoring circuitry - critical for unattended industrial equipment |
Applications
| Industrial Motor Drives | Smart Electricity Meters |
|---|---|
Use Scenario: Powering microcontroller, RS-485 transceivers, and sensor interfaces in AC-powered motor control units. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator converting 24V bus to logic supply with high ripple rejection and thermal robustness. Use Value: Delivers stable 3.3V at 2A+ under variable load and ambient temperatures up to 85°C, with no derating required. | Use Scenario: Providing isolated 3.3V rail for metrology ICs, real-time clocks, and secure MCU in utility-grade meters. IC Role / Device Role / Timing Role: Main system regulator with ON/OFF control synchronized to meter wake-up cycles to minimize battery drain. Use Value: 50µA standby current extends lithium backup battery life beyond 10 years; ±2% output ensures ADC reference stability. |
| Communication Module Power | Calling Button Operating Panel |
Use Scenario: Supplying 3.3V to LTE/Wi-Fi modules in outdoor kiosks and remote telemetry nodes. IC Role / Device Role / Timing Role: High-efficiency buck converter accepting wide-input 12–36V DC from PoE or solar charge controllers. Use Value: 86% efficiency at full load minimizes thermal rise in sealed enclosures; 40V abs max input withstands load-dump transients. | Use Scenario: Powering touch controller, LED indicators, and wireless transceiver in building access panels. IC Role / Device Role / Timing Role: Compact, low-noise 3.3V source with fast transient response to handle burst-mode RF transmission current spikes. Use Value: 3A capability handles 2A peak RF transmit loads; 260kHz switching avoids interference with 2.4GHz ISM band. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-3.3 | Lower 1.5A output current; 150kHz switching frequency; higher RDS(ON) (0.22Ω typical) | Suitable for <1.5A loads only; larger inductor size required; less efficient at 3A | Select when cost sensitivity outweighs current demand and thermal constraints |
| TPS54302DDCR | 3A synchronous buck; 2.5–6V input; no integrated high-side FET driver; requires external bootstrap cap | Not suitable for 8–40V input; designed for low-voltage battery systems only | Choose only for 3.3V output in sub-6V input applications where synchronous rectification improves light-load efficiency |
Compared with LM2676S-3.3/NOPB, LM2596S-3.3 offers lower cost but sacrifices 3A capability and thermal performance, while TPS54302DDCR provides synchronous efficiency benefits only within its narrow 2.5–6V input window - neither matches the LM2676S-3.3/NOPB's combination of wide-input operation, integrated high-side switch, and industrial-grade thermal margin.
Availability
LM2676S-3.3/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, smart electricity meters, and communication module power supplies requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LM2676S-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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and communications markets.
The LM2676 series belongs to TI's SIMPLE SWITCHER® family of easy-to-use DC-DC converters, engineered specifically for high-reliability, wide-input industrial power supplies where minimal external components and proven thermal robustness are essential.
FAQ
What is the maximum input voltage rating for LM2676S-3.3/NOPB?
The absolute maximum input voltage for LM2676S-3.3/NOPB is 45V, but the recommended operating range is 8V to 40V. Exceeding 40V may trigger overvoltage protection or reduce long-term reliability. The device maintains regulation and thermal safety across this full 8–40V span, making it ideal for 12V/24V industrial systems with transient surges.
Does LM2676S-3.3/NOPB require external feedback resistors?
No, LM2676S-3.3/NOPB does not require external feedback resistors. As a fixed-output variant, it internally sets the 3.3V regulation point; the FB pin is connected directly to the output capacitor. This eliminates resistor tolerance errors and temperature drift, ensuring ±2% output accuracy over line, load, and temperature without calibration.
What package type is used for LM2676S-3.3/NOPB?
LM2676S-3.3/NOPB is packaged in the KTW (TO-263-7) thermally enhanced surface-mount package, measuring 10.1mm × 15.24mm with an exposed thermal pad. This package delivers superior thermal performance versus TO-220 alternatives and is optimized for automated assembly in high-volume industrial PCBs.
How does the ON/OFF pin function on LM2676S-3.3/NOPB?
The ON/OFF pin (Pin 7) enables logic-level control of LM2676S-3.3/NOPB: applying ≥1.4V turns the regulator on, while ≤0.8V forces shutdown with only 50µA quiescent draw. An internal 20µA pull-up allows direct connection to microcontroller GPIOs without external biasing, supporting rapid system-level power sequencing.
What is the typical efficiency of LM2676S-3.3/NOPB at full load?
LM2676S-3.3/NOPB achieves 86% typical efficiency at 12V input and 3A output load. This value is measured under standard test conditions and reflects the benefit of its 150mΩ DMOS switch and optimized gate drive architecture. Efficiency remains above 80% across 8–40V input range and 0.1–3A load, supporting energy-sensitive applications.
LM2676S-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Packaging:
- Tube
- 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:
- TO-263 (DDPAK-7)
LM2676S-3.3/NOPB FAQ
1.How can I place an order for LM2676S-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676S-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 LM2676S-3.3/NOPB reliable?
The price and inventory of LM2676S-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 LM2676S-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2676S-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676S-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676S-3.3/NOPB?
LM2676S-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676S-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 LM2676S-3.3/NOPB?
For technical support, including LM2676S-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676S-3.3/NOPB requirements.
6.How does Aetrix verify that LM2676S-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2676S-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 LM2676S-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2676S-3.3/NOPB?
All LM2676S-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2676S-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 LM2676S-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2676S-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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