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Texas Instruments LM2676S-ADJ/NOPB
- Part No.:
- LM2676S-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2676S-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:1,725
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Product details
Overview
LM2676S-ADJ/NOPB 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, 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 LM2676S-ADJ/NOPB datasheet, LM2676S-ADJ/NOPB pinout, LM2676S-ADJ/NOPB application, or LM2676S-ADJ/NOPB equivalent, key selection criteria include its ±2% output tolerance over line/load/temperature, 50µA standby current, 88% typical efficiency at 12VIN/3A, and TO-263-7 (KTW) package thermal performance.
Technical Context
The LM2676S-ADJ/NOPB implements a fixed-frequency PWM buck controller with internal 260kHz oscillator and integrated 150mΩ DMOS high-side switch. Its feedback loop senses output voltage via external resistor divider connected to FB pin, enabling precise 1.2V–37V regulation with ±2% tolerance across –40°C to 125°C junction temperature.
It operates in continuous conduction mode with 91% maximum duty cycle, features built-in current limit (3.6A–5.4A), thermal shutdown, and ON/OFF pin with 1.4V threshold. The CB pin drives the bootstrap circuit for high-side gate drive, while Switch_output (pin 1) delivers pulsed voltage to the external inductor and catch diode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 3A max continuous - supports industrial loads without external current boosting. |
| Input voltage range | 8V to 40V - compatible with 12V/24V industrial rails and wide-input battery systems. |
| Output voltage range | 1.2V to 37V adjustable - set via external resistor divider on FB pin; enables single BOM for multiple output voltages. |
| Switching frequency | 260kHz fixed - enables use of compact off-the-shelf inductors and reduces EMI compared to lower frequencies. |
| Feedback reference voltage | 1.21V ±1.1% - determines output accuracy; sets VOUT = 1.21V × (1 + R1/R2). |
| Efficiency | 88% typical at 12VIN/3A/5VOUT - achieved via low RDS(ON) (150mΩ) DMOS switch and optimized control architecture. |
| Standby current | 50µA - enables ultra-low-power shutdown in battery-backed or energy-sensitive systems. |
| Thermal protection | Integrated thermal shutdown - disables output above safe junction temperature to prevent damage during overload or poor heatsinking. |
Pinout & Package
LM2676S-ADJ/NOPB is packaged in TO-263-7 (KTW), a surface-mount power package with exposed thermal pad (DAP) soldered to PCB ground plane for optimal thermal dissipation (RθJA = 56°C/W with 0.136 in² copper). Pin 1 is Switch_output; pins 4 and 9 (DAP) are GND; pin 7 is ON/OFF enable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Switch_output) | High-side switch drain node | Connects to inductor and cathode of external Schottky diode; carries high dv/dt switching waveform - requires short, low-inductance layout. |
| 2 (Input) | Main power input | Accepts 8V–40V supply; must be bypassed with low-ESR capacitor placed adjacent to pin to suppress input ripple and ringing. |
| 3 (CB) | Bootstrap capacitor connection | Connects 100nF ceramic capacitor to Switch_output (pin 1); provides gate drive voltage > VIN for full enhancement of internal DMOS switch. |
| 4 (GND) | Power ground | Primary ground return for input/output capacitors and IC substrate; must be tied directly to DAP (pin 9) and system ground plane. |
| 6 (FB) | Feedback sense input | High-impedance (85nA bias) input monitoring output voltage via resistor divider; determines regulated output per VFB = 1.21V. |
| 7 (ON/OFF) | Enable/disable control | Logic-level input: ≥1.4V enables regulation; ≤0.8V forces shutdown with 50µA quiescent draw; internal 20µA pull-up allows floating for always-on operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS switch | Eliminates need for external MOSFET and driver, reducing BOM count and layout complexity while maintaining >88% efficiency at 3A. |
| Fixed 260kHz oscillator | Enables predictable EMI profile and consistent use of standardized, low-cost inductors - no external timing components required. |
| ±2% output voltage tolerance | Guaranteed over full line (8V–40V), load (100mA–3A), and temperature (–40°C to 125°C) - ensures reliable downstream logic and analog circuit operation. |
| 50µA shutdown current | Supports battery-powered or energy-harvesting applications where standby power budget is constrained to sub-100µA levels. |
| Thermal shutdown + current limit | Provides autonomous fault protection without external circuitry - prevents catastrophic failure during short-circuit or overheating conditions. |
| WEBENCH® Power Designer support | Enables instant schematic generation, component selection, and performance simulation - accelerates design-to-prototype time by >50%. |
Applications
| Industrial Power Supply | Electricity Meter |
|---|---|
Use Scenario: Provides isolated 5V/3.3V rail for microcontroller, RTC, and communication ICs in DIN-rail mounted metering hardware operating from 24V DC bus. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering regulated output with tight line/load regulation and low standby draw. Use Value: Maintains ±2% output accuracy across wide temperature range (–25°C to 70°C ambient), ensuring metrology ADC reference stability and real-time clock accuracy. |
Use Scenario: Powers display, PLC interface, and data logging circuitry in revenue-grade smart electricity meters with long-term field deployment. IC Role / Device Role / Timing Role: High-reliability DC-DC converter supplying 3.3V to metrology SoC and secure element under variable input (12–36V AC/DC adapter). Use Value: 88% efficiency minimizes self-heating inside sealed meter enclosure; thermal shutdown prevents drift-induced measurement error during sustained overload. |
| Motor Drive Control Board | Communication Module |
Use Scenario: Generates 5V auxiliary supply for gate drivers, current sensors, and MCU on brushed/BLDC motor control boards powered from 24V or 48V battery packs. IC Role / Device Role / Timing Role: Robust buck regulator handling high dv/dt noise from nearby motor switching; immune to load transients up to 3A step changes. Use Value: Fast transient response (<200µs settling) and 91% max duty cycle maintain regulation during motor stall events; GND pin layout minimizes noise coupling into analog sensing paths. |
Use Scenario: Supplies 3.3V to LTE/Wi-Fi modules and baseband processors in remote IoT gateways operating from 12V PoE or solar-charged batteries. IC Role / Device Role / Timing Role: Adjustable-output buck converter supporting multiple module variants (3.3V/5V) using same PCB footprint and firmware configuration. Use Value: 1.2V–37V adjustability enables single hardware revision across product SKUs; 50µA shutdown extends battery life during deep-sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596S-ADJ | Lower 1.5A output current, 150kHz switching frequency, higher RDS(ON) (220mΩ), wider VIN (4.5–40V) | Suitable for <2A loads; less efficient at 3A; requires larger inductor due to lower frequency | Select when cost sensitivity outweighs current capability and efficiency requirements. |
| TPS54302DDCR | 3A synchronous buck, 2.5–6V input, integrated high/low-side FETs, 500kHz–2.2MHz programmable frequency | Requires 5V–6V input only; not compatible with 12V/24V industrial rails; smaller 6-pin SOT-23 package | Choose for space-constrained, low-input-voltage designs where synchronous rectification improves light-load efficiency. |
Compared with LM2676S-ADJ/NOPB, LM2596S-ADJ offers lower cost but reduced current headroom and efficiency, while TPS54302DDCR enables higher frequency and smaller magnetics but lacks wide-input capability - making LM2676S-ADJ/NOPB optimal for robust 8–40V, 3A industrial buck conversion.
Availability
LM2676S-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, electricity meters, motor drive control boards, and communication modules requiring stable component supply, long-lifecycle availability, and proven thermal reliability in demanding environments.
Supply support for LM2676S-ADJ/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 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 motor control applications where efficiency, thermal resilience, and long-term supply stability are critical.
FAQ
What is the maximum output current supported by the LM2676S-ADJ/NOPB?
The LM2676S-ADJ/NOPB 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 3.6A and 5.4A depending on temperature, with thermal shutdown engaging if junction temperature exceeds safe limits. Derating is required above 85°C ambient without forced airflow or enhanced heatsinking.
How do I configure the output voltage for the LM2676S-ADJ/NOPB?
The LM2676S-ADJ/NOPB uses an external resistor divider on the FB pin to set output voltage: VOUT = 1.21V × (1 + R1/R2), where R2 connects from FB to GND and R1 from VOUT to FB. For example, 1.21V output requires R2 = 10kΩ and R1 = 0Ω (direct connection); 12V output uses R1 = 89.8kΩ and R2 = 10kΩ. Layout must minimize noise pickup on the FB trace.
Does the LM2676S-ADJ/NOPB require an external catch diode?
Yes, the LM2676S-ADJ/NOPB requires an external Schottky diode connected from Switch_output (pin 1) to GND. This diode provides the freewheeling path for inductor current when the internal DMOS switch is OFF. TI recommends a 3A+ Schottky with VF ≤ 0.5V and low reverse recovery - such as SB560 or MBR360 - placed adjacent to pin 1 with minimal trace length.
What is the purpose of the CB pin on the LM2676S-ADJ/NOPB?
The CB (bootstrap capacitor) pin on the LM2676S-ADJ/NOPB connects a 100nF ceramic capacitor between itself and Switch_output (pin 1). This capacitor charges during the low-side conduction phase and supplies gate drive voltage > VIN to fully enhance the internal high-side DMOS switch, ensuring low RDS(ON) and high efficiency. A low-ESR, X7R or C0G dielectric capacitor is mandatory.
Can the LM2676S-ADJ/NOPB operate with input voltage below 8V?
No - the LM2676S-ADJ/NOPB has a minimum recommended input voltage of 8V per datasheet Section 5.3. Operation below this violates absolute maximum ratings and may cause erratic regulation, dropout, or failure to start. The internal bias circuitry and DMOS switch threshold require ≥8V to ensure stable oscillation, proper gate drive, and guaranteed 3A output capability.
LM2676S-ADJ/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:
- 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)
LM2676S-ADJ/NOPB FAQ
1.How can I place an order for LM2676S-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676S-ADJ/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-ADJ/NOPB reliable?
The price and inventory of LM2676S-ADJ/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-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2676S-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676S-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676S-ADJ/NOPB?
LM2676S-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676S-ADJ/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-ADJ/NOPB?
For technical support, including LM2676S-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676S-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2676S-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2676S-ADJ/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-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2676S-ADJ/NOPB?
All LM2676S-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2676S-ADJ/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-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2676S-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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