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Texas Instruments LM2676SD-12
- Part No.:
- LM2676SD-12
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2676SD-12.pdf
- Description:
- IC REG BUCK 12V 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,721
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Product details
Overview
LM2676SD-12 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 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 LM2676SD-12 datasheet, LM2676SD-12 pinout, LM2676SD-12 application, or LM2676SD-12 equivalent, key selection criteria include its thermal performance in TO-263 (KTW) package, ON/OFF control interface, bootstrap capacitor requirement, and compatibility with standard off-the-shelf inductors and Schottky diodes in buck converter designs.
Technical Context
The LM2676SD-12 implements a voltage-mode PWM controller with a fixed 260kHz oscillator and internal current-limit protection (3.6–5.4A). Its DMOS power switch operates with RDS(ON) = 0.15–0.29Ω across –40°C to 125°C junction temperature, enabling high-efficiency conversion without external gate drivers.
Feedback is internally trimmed for 12V output - pin 6 (FB) connects directly to VOUT - eliminating external resistors. The ON/OFF pin (pin 7) enables shutdown with 50µA standby current, while the CB pin (pin 3) requires a 100nF ceramic capacitor to drive the high-side FET gate above VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±2% over full line, load, and –40°C to 125°C junction temperature range. |
| Max Output Current | 3A continuous; current limit threshold 3.6–5.4A ensures robust overload protection. |
| Input Voltage Range | 8V to 40V DC - supports 12V/24V industrial bus rails and battery-backed systems. |
| Switching Frequency | 260kHz fixed (±11%) - enables use of compact, standardized inductors and reduces EMI filtering burden. |
| Efficiency | Up to 94% at VIN = 24V, IOUT = 3A - achieved via low RDS(ON) DMOS switch and optimized gate drive. |
| Quiescent Current | 4.2–6mA active mode; 50–150µA in shutdown (ON/OFF = LOW) - critical for low-power standby operation. |
| Thermal Resistance | RθJA = 56°C/W (KTW package on 0.136 in² copper); RθJC(top) = 2°C/W - enables high-power density layout. |
Pinout & Package
LM2676SD-12 is supplied in the KTW (TO-263-7) thermally enhanced surface-mount package (10.1mm × 15.24mm), featuring an exposed thermal pad (DAP) tied to GND for optimal heat dissipation. Pin 1 is Switch_output, pin 2 is Input, pin 3 is CB (bootstrap capacitor connection), pin 4 is GND, pin 5 is NC, pin 6 is FB (internally set for 12V), and pin 7 is ON/OFF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Switch_output) | High-side DMOS drain node | Switching node connected to inductor and cathode of external Schottky diode; swings between VIN and ~–0.5V during OFF time. |
| 2 (Input) | Main power supply input | Accepts 8–40V DC; must be bypassed with low-ESR capacitor placed adjacent to pin to minimize high-frequency ringing. |
| 3 (CB) | Bootstrap capacitor terminal | Connects to 100nF ceramic capacitor referenced to Switch_output; provides gate drive voltage > VIN for full FET enhancement. |
| 4 (GND) | Power ground reference | Primary return path for input/output capacitors and thermal pad (DAP); requires low-inductance PCB ground plane. |
| 6 (FB) | Feedback sense input | Internally connected to 12V divider - short directly to VOUT; no external resistors required for fixed-output operation. |
| 7 (ON/OFF) | Enable/disable control input | Logic-level interface: ≥1.4V = active regulation; ≤0.8V = shutdown (50µA IQ); internal 20µA pull-up and 7V clamp. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS switch | Eliminates need for external MOSFET and driver; reduces BOM count and layout complexity in 3A buck designs. |
| Fixed 12V output with ±2% tolerance | Guarantees stable rail for microcontrollers, sensors, and analog circuitry without trimming or calibration. |
| 260kHz fixed-frequency PWM | Enables predictable EMI spectrum and simplifies filter design using industry-standard inductor families. |
| Thermal shutdown + current limiting | Protects against sustained overloads and PCB overheating without external sensing components. |
| 50µA shutdown quiescent current | Supports battery-powered or energy-harvesting applications requiring ultra-low standby power. |
Applications
| Industrial Power Supply | Motor Drive Auxiliary Rail |
|---|---|
|
Use Scenario: Providing regulated 12V for PLC I/O modules, sensor interfaces, and fieldbus transceivers in factory automation cabinets. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator converting 24V DC bus to clean 12V logic rail with high PSRR and transient response. Use Value: Delivers 3A continuous current with <120mV output ripple (typ.) and maintains regulation during 2A load steps - ensuring reliable digital logic operation. |
Use Scenario: Generating isolated 12V gate drive or logic supply for H-bridge motor controllers in HVAC blowers or conveyor systems. IC Role / Device Role / Timing Role: Secondary buck stage supplying gate driver ICs and microcontroller peripherals from main 24V/48V bus. Use Value: Achieves 94% efficiency at full load, reducing thermal load on motor control PCBs and enabling compact heatsink-free designs. |
| Electricity Meter Power Management | Communication Module Power |
|
Use Scenario: Powering metrology ASICs, RTCs, and RF transceivers in smart electricity meters operating from 12–40V DC input. IC Role / Device Role / Timing Role: Main DC-DC converter providing tightly regulated 12V rail with low noise and high line regulation (0.01%/V). Use Value: Maintains ±2% output accuracy across –40°C to 85°C ambient and 8–40V input - meeting IEC 62053-21 metrology compliance. |
Use Scenario: Supplying 12V to LTE/LoRaWAN modems, RS-485 transceivers, and isolation barriers in remote telemetry units. IC Role / Device Role / Timing Role: High-reliability buck regulator supporting wide-input operation and fast ON/OFF sequencing for network sleep modes. Use Value: Enables rapid enable/disable via pin 7 with <100µs startup time and 50µA shutdown current - extending battery life in solar-powered nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675SD-12 | Lower 1A output current rating; same 260kHz frequency, 12V fixed output, and KTW package. | Suitable only for sub-1A loads; lacks current limit headroom for motor or surge-prone applications. | Select LM2675SD-12 only when load current remains ≤1A and board space/thermal constraints favor identical footprint. |
| LMR51430RGER | 3A synchronous buck with 4.5–36V input, 500kHz/1.1MHz selectable frequency, and integrated high/low-side FETs. | Requires no external diode; offers higher efficiency at light loads due to synchronous rectification. | Choose LMR51430RGER for new designs needing >95% efficiency, smaller solution size, or wider input range - but note different pinout and compensation requirements. |
Compared with LM2676SD-12, LM2675SD-12 trades output current for reduced thermal demand in low-power applications, while LMR51430RGER replaces the external diode and improves light-load efficiency via synchronous topology - both require layout and compensation redesign.
Availability
LM2676SD-12 is available at Aetrix Electronics and suitable for industrial power supplies, motor drive auxiliary rails, and electricity meter power management requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2676SD-12 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® 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 input voltage rating for LM2676SD-12?
The absolute maximum input voltage for LM2676SD-12 is 45V DC, but the recommended operating range is 8V to 40V. Operation above 40V risks exceeding safe SOA limits under transient conditions, and TI specifies 40V as the upper bound for guaranteed performance across temperature and load. Always include input overvoltage clamping if system transients exceed this level.
Does LM2676SD-12 require an external Schottky diode, and what specifications are critical?
Yes, LM2676SD-12 requires an external Schottky diode connected from Switch_output (pin 1) to GND. Critical specs include 40V+ reverse voltage rating, 3A+ average forward current, low forward voltage (<0.5V at 3A), and fast recovery (<50ns). TI recommends diodes such as SS34 or MBR340 - undersized diodes cause thermal failure and efficiency loss.
Can LM2676SD-12 be used in a synchronous buck configuration?
No, LM2676SD-12 is an asynchronous buck regulator and cannot be configured as synchronous. It integrates only a high-side DMOS switch and relies on an external Schottky diode for low-side conduction. Synchronous operation would require a second actively controlled switch and matching gate drive timing - functionality not supported by LM2676SD-12's architecture.
What is the purpose of the CB pin on LM2676SD-12, and what capacitor value is required?
The CB (bootstrap capacitor) pin on LM2676SD-12 provides gate drive voltage for the internal high-side DMOS switch. A 100nF X7R ceramic capacitor must be connected between CB and Switch_output (pin 1) to ensure sufficient gate overdrive above VIN. Using lower capacitance or poor-quality dielectrics causes erratic switching, increased RDS(ON), and thermal runaway.
How does the ON/OFF pin function on LM2676SD-12, and what are its voltage thresholds?
The ON/OFF pin (pin 7) enables or disables LM2676SD-12 regulation. It has a 1.4V typical turn-on threshold and 0.8V typical turn-off threshold, with internal 20µA pull-up and 7V Zener clamp. Driving it below 0.8V places LM2676SD-12 in shutdown with 50µA quiescent current; leaving it open or pulling ≥1.4V activates regulation. Do not exceed 6V to avoid damage.
LM2676SD-12 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:
- 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:
- 14-VSON (5x6)
LM2676SD-12 FAQ
1.How can I place an order for LM2676SD-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676SD-12 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-12 reliable?
The price and inventory of LM2676SD-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2676SD-12 is usually 5 days.
3.What payment methods are accepted for LM2676SD-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676SD-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676SD-12?
LM2676SD-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676SD-12 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-12?
For technical support, including LM2676SD-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676SD-12 requirements.
6.How does Aetrix verify that LM2676SD-12 is sourced from the original manufacturer or authorized distributors?
All LM2676SD-12 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-12 meets industry standards.
7.What is the process for return or replacement of LM2676SD-12?
All LM2676SD-12 units undergo pre-shipment inspection (PSI). If there is an issue with LM2676SD-12, 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-12 part is unused and in its original packaging.
Return procedure for LM2676SD-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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