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Texas Instruments LM2676S-12/NOPB
- Part No.:
- LM2676S-12/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2676S-12/NOPB.pdf
- Description:
- IC REG BUCK 12V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:655
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Product details
Overview
LM2676S-12/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering up to 3A output current with fixed 12V output, 260kHz fixed-frequency operation, ±2% output voltage tolerance over full line/load/temperature, and 94% peak efficiency at 24VIN/3A. It integrates a 150mΩ DMOS high-side switch and supports wide 8–40V input for industrial power rails.
For engineers reviewing the LM2676S-12/NOPB datasheet, LM2676S-12/NOPB pinout, LM2676S-12/NOPB application, or LM2676S-12/NOPB equivalent, this page delivers verified pin functions, thermal performance data per TO-263 package, real-world efficiency curves, ON/OFF control behavior, and validated alternative parts for 12V buck conversion designs.
Technical Context
The LM2676S-12/NOPB implements a voltage-mode PWM controller with internal 260kHz oscillator and integrated 150mΩ DMOS high-side switch. Its feedback loop uses a precision 1.21V reference and low-bias-current amplifier (85nA) referenced to the FB pin, enabling stable regulation without external compensation in standard layouts.
It operates in continuous conduction mode (CCM) across its rated 100mA–3A load range, with built-in thermal shutdown, cycle-by-cycle current limiting (3.6–5.4A), and shutdown mode reducing quiescent current to 50µA. The ON/OFF pin accepts TTL-compatible logic control with 0.8–2.0V threshold and 20µA input current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 12V ±2% (11.76–12.24V) over –40°C to 125°C junction temp, 15–40V input, 100mA–3A load. |
| Switching frequency | 260kHz fixed (225–280kHz over temp), enabling compact magnetics and predictable EMI profile. |
| Efficiency | 94% typical at VIN = 24V, IOUT = 3A - reduces thermal load and enables smaller heatsinks in 12V systems. |
| Input voltage range | 8V to 40V DC - supports 12V/24V/36V industrial bus rails and battery-backed inputs with headroom. |
| Current limit | 4.5A typical (3.6–5.4A over temp) - provides robust short-circuit protection without external sensing. |
| Quiescent current | 6mA active, 50µA standby - enables low-power hold-up during system sleep modes. |
| RDS(ON) | 0.17Ω typical (0.29Ω max at 125°C) - minimizes conduction loss and self-heating under full 3A load. |
Pinout & Package
LM2676S-12/NOPB is supplied in the KTW (TO-263-7) thermally enhanced surface-mount package (10.1mm × 15.24mm), with exposed DAP connected internally to GND for optimal thermal dissipation (RθJA = 35°C/W with 0.4896 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch output | Drain node of internal DMOS FET; connects to inductor and Schottky diode cathode - carries full switching current and requires low-inductance layout. |
| 2 (VIN) | Input supply | High-current input path to FET source and internal bias circuitry; must be decoupled with low-ESR capacitor placed <1cm from pin. |
| 3 (CB) | Bootstrap capacitor | Connects 100nF ceramic capacitor to SW pin to generate gate drive voltage >VIN for full FET enhancement. |
| 4 (GND) | Power ground | Main return path for input/output capacitors and thermal pad; requires direct connection to large PCB ground plane. |
| 5 (NC) | No connect | Internally unconnected; must remain floating - no routing or soldering allowed. |
| 6 (FB) | Feedback sense | Direct connection to 12V output (no divider); senses regulated voltage with 1.21V internal reference and 85nA bias current. |
| 7 (ON/OFF) | Enable control | TTL-compatible digital input: <0.8V = shutdown (50µA IQ), >1.4V = active; includes 20µA pullup and 7V clamp. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS switch | Eliminates external MOSFET and driver, reducing BOM count and layout complexity for 3A buck designs. |
| Fixed 12V output with ±2% tolerance | Removes need for external resistor divider and associated tolerance stack-up - simplifies validation and production test. |
| 260kHz fixed-frequency PWM | Enables use of standardized, off-the-shelf 33–47µH shielded inductors and predictable EMI filtering design. |
| Thermal shutdown + current limiting | Provides autonomous fault protection without external circuitry - critical for unattended industrial equipment. |
| 50µA shutdown quiescent current | Supports low-power wake-on-event architectures where 12V rail must remain available but inactive. |
Applications
| Industrial Motor Drives | Smart Electricity Meters |
|---|---|
|
Use Scenario: Powering gate drivers and MCU peripherals in 24V-powered motor control modules requiring clean, regulated 12V at up to 3A. IC Role / Device Role / Timing Role: Primary non-isolated 12V buck converter supplying isolated gate driver bias and microcontroller I/O rails. Use Value: 94% efficiency minimizes heat buildup in sealed enclosures; 260kHz switching avoids audible noise and eases EMI filter design. |
Use Scenario: Generating stable 12V supply for metrology ADCs, real-time clocks, and RF transceivers in utility-grade electricity meters. IC Role / Device Role / Timing Role: Main system power regulator converting 24V backup battery or rectified AC to precision 12V reference rail. Use Value: ±2% output tolerance ensures consistent ADC reference and RTC accuracy; 50µA shutdown extends battery life during outages. |
| Communication Module Power | Calling Panel Control Systems |
|
Use Scenario: Providing 12V power to PoE-powered wireless access points, cellular modems, and Ethernet switches operating from 24–48V DC inputs. IC Role / Device Role / Timing Role: Intermediate bus converter stepping down mid-rail voltage to 12V for PHY, PHY interface, and management MCU. Use Value: Wide 8–40V input accommodates PoE+ derating and transient surges; integrated current limit protects against cable fault conditions. |
Use Scenario: Supplying 12V to LED indicators, tactile button interfaces, and low-power audio amplifiers in building intercom and elevator call panels. IC Role / Device Role / Timing Role: System-level power manager delivering regulated 12V from 24V building power with ON/OFF sequencing. Use Value: TTL-compatible ON/OFF pin enables centralized power control via building automation bus; TO-263 package supports convection cooling in plastic housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12V buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675-12/NOPB | 2.5A output rating, same 260kHz frequency and 12V fixed output, but lower current limit (3.5A vs 4.5A) and higher RDS(ON) (0.22Ω). | Suitable for <2.5A loads only; less margin for peak motor currents or cold-start surges. | Select when cost sensitivity outweighs 0.5A headroom and thermal margin requirements. |
| LMR51430RGER | 3A synchronous buck, 4.5–36V input, adjustable output, 500kHz/1.1MHz selectable frequency, 95% efficiency, integrated high/low-side FETs. | Requires external feedback resistors; supports dynamic voltage scaling and tighter input range than LM2676S-12/NOPB. | Choose for new designs needing higher efficiency, smaller solution size, or programmable output - not drop-in compatible. |
Compared with LM2676S-12/NOPB, LM2675-12/NOPB trades 0.5A output and thermal headroom for legacy compatibility, while LMR51430RGER offers modern synchronous architecture and flexibility at the cost of design requalification and external component additions.
Availability
LM2676S-12/NOPB 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 LM2676S-12/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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM2676 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use in cost-sensitive, medium-power DC-DC applications where minimal external components and fast time-to-market are critical.
FAQ
What is the maximum input voltage rating for LM2676S-12/NOPB?
The absolute maximum input voltage for LM2676S-12/NOPB is 45V DC, but the recommended operating range is 8V to 40V. Operation above 40V risks exceeding internal device stress limits and may trigger thermal shutdown or reduce long-term reliability. For sustained 40V operation, ensure adequate PCB copper area and airflow per TI's thermal guidelines for the KTW package.
Does LM2676S-12/NOPB require an external feedback resistor network?
No, LM2676S-12/NOPB does not require external feedback resistors. As a fixed-output variant, it contains internal precision resistors that set the output to 12V. The FB pin must be connected directly to the output capacitor's positive terminal - no divider is needed or permitted. This eliminates resistor tolerance errors and simplifies layout verification.
Can LM2676S-12/NOPB be used in discontinuous conduction mode (DCM)?
Yes, LM2676S-12/NOPB operates naturally in DCM at light loads (<300mA typical). Its voltage-mode PWM controller maintains regulation across both CCM and DCM without external compensation changes. DCM behavior is documented in TI's SNVS031N datasheet Figure 5-13 and supports low-noise, low-RMS-current operation in standby states.
What thermal performance can be expected from LM2676S-12/NOPB in the KTW package?
In the KTW (TO-263-7) package with 0.4896 in² (3.6× package area) of 1 oz copper, LM2676S-12/NOPB achieves RθJA = 35°C/W. At 3A output and 94% efficiency (6% loss = 1.44W), junction-to-ambient rise is ~50°C - keeping TJ well below 125°C even at 75°C ambient. Thermal pad soldering to PCB ground is mandatory for this rating.
Is LM2676S-12/NOPB RoHS-compliant and lead-free?
Yes, LM2676S-12/NOPB is RoHS-compliant and lead-free. The /NOPB suffix explicitly denotes "No Lead (Pb)-Free" packaging per TI's product nomenclature. It meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified for lead-free reflow soldering profiles up to 260°C peak temperature.
LM2676S-12/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):
- 12V
- 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-12/NOPB FAQ
1.How can I place an order for LM2676S-12/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676S-12/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-12/NOPB reliable?
The price and inventory of LM2676S-12/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-12/NOPB is usually 5 days.
3.What payment methods are accepted for LM2676S-12/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676S-12/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676S-12/NOPB?
LM2676S-12/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676S-12/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-12/NOPB?
For technical support, including LM2676S-12/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676S-12/NOPB requirements.
6.How does Aetrix verify that LM2676S-12/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2676S-12/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-12/NOPB meets industry standards.
7.What is the process for return or replacement of LM2676S-12/NOPB?
All LM2676S-12/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2676S-12/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-12/NOPB part is unused and in its original packaging.
Return procedure for LM2676S-12/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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