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Texas Instruments LM2676S-5.0/NOPB
- Part No.:
- LM2676S-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-8, D2PAK (7 Leads + Tab), TO-263CA
- Datasheet:
-
LM2676S-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A TO263
- Quantity:
- Payment:
- Shipping:
Inventory:825
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Product details
Overview
LM2676S-5.0/NOPB from Texas Instruments is a monolithic step-down (buck) switching regulator IC delivering up to 3A output current with fixed 5.0V output, 8–40V input range, 260kHz fixed-frequency operation, and ±2% output voltage tolerance over full line/load/temperature. It integrates a 150mΩ DMOS high-side switch and supports ON/OFF control for low-power standby mode in industrial power supplies.
For engineers reviewing the LM2676S-5.0/NOPB datasheet, LM2676S-5.0/NOPB pinout, LM2676S-5.0/NOPB application, or LM2676S-5.0/NOPB equivalent, key selection criteria include its 3A continuous output capability, thermal shutdown protection, 50µA standby quiescent current, and compatibility with standard off-the-shelf inductors and Schottky diodes in TO-263-7 (KTW) package designs.
Technical Context
The LM2676S-5.0/NOPB implements a fixed-frequency PWM buck controller with internal 260kHz oscillator and integrated 150mΩ DMOS high-side switch. Its feedback loop uses a precision 1.21V reference and internal resistor divider for 5.0V regulation, eliminating external resistors.
It operates in continuous conduction mode (CCM) across 100mA–3A load range, features cycle-by-cycle current limiting (typ. 4.5A), thermal shutdown, and ON/OFF pin control with 1.4V threshold. The KTW (TO-263-7) package provides enhanced thermal performance via exposed DAP connected to GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% over –40°C to 125°C junction temp, line, and load - ensures stable logic supply without external feedback components. |
| Max Output Current | 3A continuous - supports mid-power embedded systems without external current boosting. |
| Input Voltage Range | 8V to 40V - compatible with 12V/24V industrial rails and unregulated DC sources. |
| Switching Frequency | 260kHz ±11% - enables use of compact, off-the-shelf 33µH inductors and reduces EMI compared to lower frequencies. |
| Efficiency | 88% at VIN=12V, IOUT=3A - minimizes thermal load in enclosed enclosures and extends battery runtime in backup systems. |
| Quiescent Current | 6mA operating / 50µA standby - allows low-power sleep modes in metering and remote sensor applications. |
| RDS(ON) | 0.15Ω typical - reduces conduction loss and improves efficiency at high load currents. |
| Thermal Resistance | RθJA = 56°C/W (KTW on 0.136 in² copper) - enables 3A operation without external heatsink under moderate ambient conditions. |
Pinout & Package
LM2676S-5.0/NOPB is packaged in KTW (TO-263-7), a surface-mount variant of TO-220 with exposed thermal pad (DAP) soldered to PCB ground plane for optimal heat dissipation. Dimensions: 10.1mm × 15.24mm.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Switch_output | Drain node of internal DMOS switch - connects directly to inductor and cathode of external Schottky diode; carries high dv/dt switching waveform. |
| 2 | Input | Main power input (8–40V) - requires low-ESR bypass capacitor placed adjacent to minimize high-frequency ringing. |
| 3 | CB | Bootstrap capacitor connection - 100nF ceramic cap between CB and Switch_output enables full gate drive for high-side MOSFET. |
| 4 | GND | Power ground reference - must be tied to system ground and shared with CIN/COUT grounds; DAP is internally connected to this pin. |
| 5 | NC | No-connect - electrically isolated; must remain unconnected per datasheet. |
| 6 | FB | Feedback sense - internally tied to 5.0V output divider; no external components required for fixed-output version. |
| 7 | ON/OFF | Enable control input - logic-high (>1.4V) enables regulation; logic-low (<0.8V) disables output and reduces IQ to 50µA. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 150mΩ DMOS switch | Eliminates need for external high-side MOSFET and driver, reducing BOM count and layout complexity. |
| Fixed 5.0V output with ±2% tolerance | Guarantees compliance with 5V TTL/CMOS logic and microcontroller VDD requirements without trimming or calibration. |
| 260kHz fixed-frequency PWM | Enables predictable EMI filtering and consistent inductor sizing across designs using TI-recommended parts. |
| ON/OFF pin with 50µA standby | Supports system-level power sequencing and ultra-low-power sleep states in battery-backed meters and IoT nodes. |
| Built-in thermal shutdown & current limit | Protects against overload, short-circuit, and overheating without external sensing circuitry - enhances field reliability. |
| WEBENCH® Power Designer support | Provides instant schematic generation, component selection, efficiency simulation, and BOM export for rapid prototyping. |
Applications
| Communication Module Power | Electricity Meter Supply |
|---|---|
Use Scenario: Powers baseband processor, RF transceiver, and interface ICs in cellular/LTE modems requiring clean, regulated 5V at up to 2.5A. IC Role / Device Role / Timing Role: Primary non-isolated DC-DC converter stepping down 12V/24V bus to 5V logic rail with tight transient response. Use Value: Delivers 88% efficiency at full load and maintains ±2% regulation during burst transmission current spikes. |
Use Scenario: Supplies 5V to metrology ASIC, RTC, LCD controller, and isolation interface in DIN-rail electricity meters. IC Role / Device Role / Timing Role: Main 5V regulator with ON/OFF control synchronized to meter wake-up cycles to minimize annual energy consumption. Use Value: Achieves 50µA standby current and survives 40V surges per IEC 61000-4-5, meeting Class 1 accuracy requirements. |
| Motor Drive Logic Supply | Calling Panel Control Power |
Use Scenario: Provides isolated 5V logic supply for gate drivers, MCU, and current-sense amplifiers in 24V BLDC motor drives. IC Role / Device Role / Timing Role: Secondary buck regulator fed from intermediate 12V rail, decoupling high-noise motor switching from digital control circuitry. Use Value: Maintains regulation during 3A load steps with <100mV undershoot, preventing MCU resets during acceleration commands. |
Use Scenario: Powers microcontroller, keypad scanner, LED indicators, and audio codec in building intercom calling panels. IC Role / Device Role / Timing Role: Single-chip 5V solution replacing linear regulators to reduce heat in sealed plastic enclosures. Use Value: Operates continuously at 75°C ambient with no heatsink, enabled by RθJA = 56°C/W and thermal shutdown protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675-5.0 | 2.5A max output, same 260kHz frequency and pinout, but lower current rating and higher RDS(ON) (0.22Ω). | Suitable only for ≤2.5A loads; less efficient at full load due to higher conduction loss. | Select when 2.5A suffices and legacy design reuse is prioritized over peak efficiency. |
| LMR51430XDDAR | 3A synchronous buck, 4.5–36V input, 500kHz/1.1MHz selectable, integrated high/low-side FETs, smaller 8-pin SO-PowerPAD. | Higher efficiency (95%), smaller footprint, but requires external compensation and lacks fixed 5V option (adjustable only). | Choose for new designs needing higher efficiency, smaller size, and flexible frequency, accepting added design effort. |
Compared with LM2676S-5.0/NOPB, LM2675-5.0 offers pin-compatible downgrade for lower-current needs, while LMR51430XDDAR delivers superior efficiency and integration at the cost of design complexity and loss of fixed-output simplicity.
Availability
LM2676S-5.0/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, smart metering systems, and motor control logic rails requiring stable component supply, long-term manufacturability, and proven thermal robustness in TO-263 packages.
Supply support for LM2676S-5.0/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 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-5.0/NOPB?
The absolute maximum input voltage for LM2676S-5.0/NOPB is 45V, but the recommended operating range is 8V to 40V. Exceeding 40V risks violating safe operating area limits and may trigger overvoltage protection or cause permanent damage. Designs targeting 36V nominal rails should include transient suppression to ensure sustained operation remains within 40V.
Does LM2676S-5.0/NOPB require external feedback resistors?
No, LM2676S-5.0/NOPB does not require external feedback resistors. It is a fixed-output variant with internal resistor divider set for 5.0V regulation; the FB pin is internally connected and must be left unconnected externally. This simplifies layout and eliminates resistor tolerance errors affecting output accuracy.
What thermal performance can be expected from LM2676S-5.0/NOPB in KTW package?
In the KTW (TO-263-7) package with 0.136 in² copper pad, LM2676S-5.0/NOPB has RθJA = 56°C/W. At 3A output with 12V input, typical power dissipation is ~1.2W, resulting in ~67°C junction rise above ambient - well within the –40°C to 125°C operating range when ambient stays below 58°C.
Can LM2676S-5.0/NOPB be synchronized to an external clock?
No, LM2676S-5.0/NOPB cannot be synchronized to an external clock. It uses an internal fixed-frequency 260kHz oscillator with ±11% tolerance. For synchronization capability, consider newer alternatives like LM5143A or TPS54332, which support external clock sync via SYNC pin.
Is LM2676S-5.0/NOPB RoHS compliant and lead-free?
Yes, LM2676S-5.0/NOPB is RoHS compliant and lead-free. The "/NOPB" suffix explicitly denotes lead-free packaging per TI's product nomenclature, and the device meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3) requirements for surface-mount assembly.
LM2676S-5.0/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):
- 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:
- TO-263 (DDPAK-7)
LM2676S-5.0/NOPB FAQ
1.How can I place an order for LM2676S-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2676S-5.0/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-5.0/NOPB reliable?
The price and inventory of LM2676S-5.0/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-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM2676S-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2676S-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2676S-5.0/NOPB?
LM2676S-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2676S-5.0/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-5.0/NOPB?
For technical support, including LM2676S-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2676S-5.0/NOPB requirements.
6.How does Aetrix verify that LM2676S-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2676S-5.0/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-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM2676S-5.0/NOPB?
All LM2676S-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2676S-5.0/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-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM2676S-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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