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Texas Instruments LM2676SDX-5.0
- Part No.:
- LM2676SDX-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 14-VDFN Exposed Pad
- Datasheet:
-
LM2676SDX-5.0.pdf
- Description:
- IC REG BUCK 5V 3A 14VSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,485
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Product details
Overview
LM2676SDX-5.0 from Texas Instruments is a monolithic step-down (buck) DC/DC switching regulator delivering up to 3 A output current with fixed 5.0 V output, 8–40 V input range, 260 kHz fixed-frequency operation, and ±2% output voltage tolerance over full line/load/temperature. It integrates a 150 mΩ DMOS high-side switch and supports ON/OFF control for low-power standby mode in industrial power supplies.
For engineers reviewing the LM2676SDX-5.0 datasheet, LM2676SDX-5.0 pinout, LM2676SDX-5.0 application, or LM2676SDX-5.0 equivalent, key selection criteria include its 3 A continuous output capability, thermal performance in TO-263 (KTW) package, 50 µA shutdown quiescent current, and compatibility with standard off-the-shelf inductors and Schottky diodes per TI's SIMPLE SWITCHER® design methodology.
Technical Context
The LM2676SDX-5.0 implements a fixed-frequency PWM buck controller with internal 260 kHz oscillator and integrated 150 mΩ DMOS high-side switch. Its feedback loop uses a precision 1.21 V reference and high-gain amplifier referenced to the FB pin, enabling stable regulation without external compensation components in standard configurations.
It operates across –40°C to +125°C junction temperature, includes cycle-by-cycle current limiting, thermal shutdown, and an ON/OFF pin with 1.4 V threshold and 20 µA pull-up. The device enters shutdown at <0.8 V on ON/OFF, drawing only 50 µA supply current while maintaining fast wake-up response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% over full line, load, and –40°C to 125°C junction temperature - ensures stable rail for microcontrollers and logic without external resistor divider. |
| Max Output Current | 3 A continuous - supports mid-power applications like motor drivers and communication modules without external current boosting. |
| Input Voltage Range | 8 V to 40 V - accommodates wide-input industrial and automotive-derived supplies, including unregulated 24 V systems. |
| Switching Frequency | 260 kHz ±11% - enables use of compact, off-the-shelf 33 µH inductors and reduces EMI compared to higher-frequency alternatives. |
| Efficiency | Up to 88% at 12 VIN/3 A - minimizes thermal load and simplifies heatsinking in enclosed enclosures. |
| Quiescent Current (Active) | 6 mA typical - maintains low no-load power draw in always-on subsystems. |
| Standby Current | 50 µA max at OFF state - enables energy-sensitive battery-backed or remote-sensor applications. |
| RDS(ON) | 0.15 Ω typical - reduces conduction loss and improves efficiency at high load currents. |
Pinout & Package
LM2676SDX-5.0 is packaged in a 7-pin TO-263 (KTW) surface-mount package with exposed thermal pad, measuring 10.1 mm × 15.24 mm. The package features integrated thermal path via the DAP (die attach paddle), requiring direct PCB copper connection for optimal thermal performance.
| 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 - must be routed with minimal loop area to reduce EMI and voltage spikes. |
| 2 (VIN) | Input supply | Main power input (8–40 V); requires low-ESR ceramic bypass capacitor placed within 5 mm - forms critical high-current path with GND pins. |
| 3 (CB) | Bootstrap capacitor | Connects to SW via 100 nF ceramic capacitor - provides gate drive voltage above VIN to fully enhance internal high-side FET and minimize RDS(ON). |
| 4 (GND) | Power ground | Primary return path for input/output capacitors and thermal pad - must be tied directly to large copper pour for thermal and noise control. |
| 5 (NC) | No connect | Internally unconnected; electrically isolated - may be left floating or tied to GND for mechanical stability only. |
| 6 (FB) | Feedback sense | Direct connection to output capacitor for fixed 5.0 V version - eliminates external resistors and associated tolerance/temperature drift errors. |
| 7 (ON/OFF) | Enable control | Logic-level enable: ≥1.4 V = active, ≤0.8 V = shutdown; internal 20 µA pull-up allows simple open-drain or microcontroller GPIO control. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150 mΩ DMOS switch | Enables 3 A output without external MOSFETs or complex gate drive circuitry - reduces BOM count and layout complexity. |
| Fixed 5.0 V output with ±2% tolerance | Eliminates need for external feedback resistors and associated calibration - improves production yield and long-term stability. |
| 260 kHz fixed-frequency PWM | Allows predictable EMI filtering and consistent inductor sizing - avoids frequency jitter issues found in variable-frequency controllers. |
| 50 µA shutdown current | Supports ultra-low-power system sleep modes - extends battery life in portable or energy-harvested devices. |
| Built-in thermal shutdown & current limit | Provides autonomous fault protection without external sensing - prevents damage during overload or poor heatsinking conditions. |
| SIMPLE SWITCHER® design support | Validated inductor/capacitor/diode part lists and WEBENCH® Power Designer integration - cuts design time from weeks to hours. |
Applications
| Industrial Motor Drives | Smart Electricity Meters |
|---|---|
|
Use Scenario: Powers microcontroller, RS-485 transceiver, and real-time clock in three-phase metering units operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary 5 V buck regulator supplying digital core and interface ICs with tight voltage regulation and low ripple. Use Value: ±2% output tolerance ensures ADC reference stability and UART timing integrity under varying load and temperature. |
Use Scenario: Supplies 5 V rail to metrology ASIC and LCD display in DIN-rail mounted electricity meters with extended temperature requirements. IC Role / Device Role / Timing Role: Main system regulator handling 100 mA–2.5 A dynamic loads during pulse reading and wireless transmission bursts. Use Value: 3 A rating and –40°C to 125°C operation guarantee reliable startup and sustained output during cold winter or hot transformer vault environments. |
| Communication Module Power | Calling Button Operating Panel |
|
Use Scenario: Provides regulated 5 V to LTE/Wi-Fi modules in remote IoT gateways powered by 24 V PoE or solar charge controllers. IC Role / Device Role / Timing Role: High-efficiency intermediate-stage converter stepping down from 24–40 V input to clean 5 V for RF baseband and PMIC inputs. Use Value: 88% peak efficiency at 3 A reduces heat buildup in sealed enclosures, eliminating need for forced air cooling. |
Use Scenario: Powers touch controller, LED indicators, and audio codec in building intercom panels connected to 24 V security system buses. IC Role / Device Role / Timing Role: Standby-capable 5 V source enabling instant wake-from-sleep response when doorbell button is pressed. Use Value: 50 µA shutdown current allows >10-year battery backup life in maintenance-free installations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675MX-5.0 | 2.5 A output rating, same 5 V fixed output, identical pinout and package (SOIC-8), but lower current capability and reduced thermal margin. | Suitable for lower-power applications (<2 A) where board space constraints favor SOIC over TO-263. | Select when load current remains below 2.5 A and thermal budget permits smaller package footprint. |
| TPS54302DDAR | 3 A synchronous buck with integrated high/low-side FETs, 2.5–6 V input, 580 kHz switching, and 28 µA quiescent current - no external diode required. | Better suited for low-input-voltage systems (e.g., 5 V or 3.3 V rails) and ultra-low-IQ designs, but incompatible with 8–40 V input range. | Choose for new designs targeting <6 V input and highest efficiency at light loads; not a drop-in replacement for LM2676SDX-5.0. |
Compared with LM2676SDX-5.0, LM2675MX-5.0 offers identical functionality at reduced current capacity and thermal robustness, while TPS54302DDAR delivers superior light-load efficiency and integration but sacrifices input voltage range and direct pin compatibility - making LM2676SDX-5.0 the optimal choice for ruggedized 24 V industrial systems requiring proven reliability and wide-input operation.
Availability
LM2676SDX-5.0 is available at Aetrix Electronics and suitable for industrial motor drives, smart electricity meters, communication module power, and calling button operating panels requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LM2676SDX-5.0 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 in cost-sensitive, medium-power industrial and infrastructure applications where robustness, wide input range, and minimal external components are critical.
FAQ
What is the maximum input voltage rating for LM2676SDX-5.0?
The absolute maximum input voltage for LM2676SDX-5.0 is 45 V, but the recommended operating range is 8 V to 40 V DC. Exceeding 40 V continuously risks exceeding thermal limits or violating safe operating area margins, especially at high ambient temperatures. The 40 V upper limit ensures reliable operation across the full –40°C to 125°C junction temperature range with standard PCB copper heatsinking.
Does LM2676SDX-5.0 require an external Schottky diode?
Yes, LM2676SDX-5.0 requires an external Schottky diode connected between the SW pin (Pin 1) and GND. The internal DMOS switch is high-side only; the diode provides the freewheeling path during switch-off periods. TI recommends 3 A rated Schottky diodes with <0.5 V forward voltage, such as the SS34 or MBR340, to maintain high efficiency and minimize thermal stress.
Can LM2676SDX-5.0 be used in adjustable-output configurations?
No, LM2676SDX-5.0 is a fixed 5.0 V output variant and does not support adjustable output. Its FB pin is internally connected to the 5 V reference; connecting external resistors will not alter the output voltage. For adjustable operation, use the LM2676SX-ADJ variant, which has an open FB pin and requires external resistor divider to set VOUT from 1.2 V to 37 V.
What thermal performance can be expected from LM2676SDX-5.0 in TO-263 package?
In the KTW (TO-263) package with proper PCB copper heatsinking (≥1.0 in² 1 oz copper connected to the DAP), LM2676SDX-5.0 achieves a junction-to-ambient thermal resistance (RθJA) of 26°C/W. At 3 A output and 12 V input, typical power dissipation is ~0.9 W, resulting in ~23°C junction-to-ambient rise - well within the 125°C max junction limit even at 100°C ambient.
Is LM2676SDX-5.0 RoHS compliant and lead-free?
Yes, LM2676SDX-5.0 is RoHS compliant and lead-free per TI's current manufacturing standards. The TO-263 (KTW) package uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) requirements. Full compliance documentation, including material declarations and test reports, is available through TI's product folder and Aetrix Electronics' quality portal.
LM2676SDX-5.0 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):
- 5V
- 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-5.0 FAQ
1.How can I place an order for LM2676SDX-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676SDX-5.0 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-5.0 reliable?
The price and inventory of LM2676SDX-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2676SDX-5.0 is usually 5 days.
3.What payment methods are accepted for LM2676SDX-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676SDX-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676SDX-5.0?
LM2676SDX-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676SDX-5.0 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-5.0?
For technical support, including LM2676SDX-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676SDX-5.0 requirements.
6.How does Aetrix verify that LM2676SDX-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2676SDX-5.0 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-5.0 meets industry standards.
7.What is the process for return or replacement of LM2676SDX-5.0?
All LM2676SDX-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2676SDX-5.0, 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-5.0 part is unused and in its original packaging.
Return procedure for LM2676SDX-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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