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Texas Instruments LM2672N-3.3/NOPB
- Part No.:
- LM2672N-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2672N-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,134
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Product details
Overview
LM2672N-3.3/NOPB from Texas Instruments is a monolithic 1-A step-down DC-DC switching regulator in an 8-pin PDIP package, delivering fixed 3.3-V output with ±1.5% tolerance over line and load, 260-kHz fixed-frequency operation, and up to 96% efficiency. It serves as a primary voltage conversion stage in industrial power supplies, embedded controllers, and distributed power architectures requiring compact, high-efficiency buck regulation.
For engineers reviewing the LM2672N-3.3/NOPB datasheet, LM2672N-3.3/NOPB pinout, LM2672N-3.3/NOPB application, or LM2672N-3.3/NOPB equivalent, key selection criteria include input voltage range (8–40 V), thermal shutdown protection, TTL-compatible ON/OFF control, soft-start capability, and compatibility with standard Schottky catch diodes and off-the-shelf inductors.
Technical Context
The LM2672N-3.3/NOPB integrates a DMOS power MOSFET switch, fixed 260-kHz PWM oscillator, internal frequency compensation, and current-mode control architecture. Its feedback loop uses direct connection of the FB pin to the output capacitor for fixed-voltage regulation-no external resistors required.
It operates in continuous conduction mode at full 1-A load with VIN ≥ 8 V, supports external frequency synchronization via SYNC pin (400 kHz max), and implements cycle-by-cycle current limiting (1.25–2.1 A) plus thermal shutdown for fault protection. Standby quiescent current is 50 μA when ON/OFF is pulled low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1.5% over –40°C to 125°C, enabling stable logic supply without trimming. |
| Max Output Current | 1 A continuous, supporting microcontroller cores, FPGAs, and peripheral ICs without derating at 25°C. |
| Input Voltage Range | 8 V to 40 V, allowing direct use with 12-V/24-V industrial rails and battery-backed systems. |
| Switching Frequency | 260 kHz (±10%), enabling compact LC filter design with standard 47–68 μH inductors and <100 μF output capacitance. |
| Efficiency | Up to 96% at 12-V input/1-A load, minimizing board-level heat generation and eliminating need for heatsinks. |
| Quiescent Current | 3.6 mA typical operating IQ; 50 μA standby current in shutdown, critical for low-power wake-up systems. |
| Protection Features | Thermal shutdown, cycle-by-cycle current limit, and under-voltage lockout ensure robust operation under fault conditions. |
Pinout & Package
LM2672N-3.3/NOPB is housed in an 8-pin PDIP package (10.16 mm × 6.60 mm), optimized for through-hole prototyping and industrial PCB assembly with standard wave-solder processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CB) | Bootstrap capacitor connection | Connects 0.01-μF ceramic capacitor to VSW to fully enhance internal high-side MOSFET gate, ensuring low RDS(on) (0.3 Ω) and high efficiency. |
| 2 (SS) | Soft-start timing node | Accepts capacitor to GND to linearly ramp output voltage during startup, preventing inrush current into downstream capacitive loads. |
| 3 (SYNC) | External clock input | Allows synchronization to system master clock (up to 400 kHz); open-circuit defaults to internal 260-kHz oscillator. |
| 4 (FB) | Feedback sense input | Internally tied to 3.3-V reference; connect directly to output capacitor for regulation-no external divider needed. |
| 5 (ON/OFF) | Enable/disable control | TTL-compatible input: >1.4 V enables regulator; <0.8 V disables it with 50-μA standby current. |
| 6 (GND) | Power ground | Primary return path for input/output capacitors and inductor; must be short, low-impedance trace to minimize noise and EMI. |
| 7 (VIN) | Main input supply | Accepts 8–40 V DC; requires local 22-μF tantalum bypass capacitor placed adjacent to pin for high-frequency stability. |
| 8 (VSW) | Switch node output | Drives external Schottky diode and inductor; swings between VIN and ~−0.5 V (diode drop); high dv/dt node requiring careful layout. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | 0.3 Ω RDS(on) at 25°C enables 1-A output without external MOSFET, reducing BOM count and footprint. |
| Patented internal frequency compensation | Eliminates need for external compensation network-only 5 external components required for full operation. |
| Fixed 260-kHz oscillator | Enables predictable EMI profile and consistent filter component selection across designs and production lots. |
| TTL shutdown with 50-μA standby | Supports low-power sleep modes in battery-powered or energy-conscious systems without auxiliary circuitry. |
| Thermal shutdown + current limit | Provides dual-layer protection against overload, short-circuit, and ambient overheating-no external sensing required. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converts 24-V vehicle battery rail to clean 3.3-V supply for MCU, CAN transceivers, and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 3.3-V domain with transient immunity per ISO 7637-2. Use Value: 94% efficiency at 24-V input minimizes thermal stress in sealed enclosures; 40-V abs max input withstands load-dump transients. |
Use Scenario: Powers ARM-based controller and I/O drivers in programmable logic controllers operating from 12-V or 24-V factory mains. IC Role / Device Role / Timing Role: Main DC-DC converter delivering stable 3.3-V core voltage with tight ±1.5% tolerance across temperature and line variation. Use Value: Internal soft-start prevents brownout during cold-start; thermal shutdown ensures safe operation during extended overloads. |
| Medical Diagnostic Equipment | Test & Measurement Instrumentation |
Use Scenario: Supplies 3.3-V logic for FPGA-based signal processing units in portable ultrasound and patient monitors. IC Role / Device Role / Timing Role: High-efficiency intermediate regulator stepping down from 12-V intermediate bus to low-noise digital domain. Use Value: 260-kHz fixed frequency simplifies EMI filtering to meet IEC 60601-1 emissions limits; no external compensation reduces layout sensitivity. |
Use Scenario: Generates precise 3.3-V reference for ADCs, DACs, and digital logic in benchtop oscilloscopes and spectrum analyzers. IC Role / Device Role / Timing Role: Low-noise, tightly regulated power source where output ripple and long-term stability impact measurement accuracy. Use Value: ±1.5% output tolerance and <100-mVpp ripple (typ.) ensure sub-LSB error in 12-bit+ data converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2672MX-3.3/NOPB | Same electrical specs; SOIC-8 package (5.00 × 6.20 mm) instead of PDIP-surface-mount only, lower thermal resistance (RθJA = 105°C/W vs. 95°C/W). | Suitable for automated SMT production; not compatible with through-hole layouts or hand-soldered prototypes. | Select LM2672MX-3.3/NOPB for volume SMT builds; LM2672N-3.3/NOPB remains optimal for lab validation, repair, or legacy through-hole systems. |
| LM2596T-3.3 | 3-A rated, 150-kHz switching frequency, wider input range (4.5–40 V), but ±2% output tolerance and no SYNC or soft-start pins. | Better for higher-current or lower-cost applications where precision and advanced features are secondary. | Choose LM2596T-3.3 only if 3-A output or lower BOM cost is mandatory; LM2672N-3.3/NOPB offers superior regulation accuracy, EMI control, and feature set for demanding designs. |
Compared with LM2672MX-3.3/NOPB, the LM2672N-3.3/NOPB trades surface-mount scalability for mechanical robustness and ease of manual handling-critical for field-replaceable modules. Against LM2596T-3.3, it delivers tighter output tolerance, integrated soft-start, and synchronization capability at the cost of 2-A lower current rating, making it preferable for precision 1-A applications.
Availability
LM2672N-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, medical diagnostics, and test equipment requiring stable component supply across multi-year production cycles.
Supply support for LM2672N-3.3/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 LM2672 series belongs to TI's SIMPLE SWITCHER® family-designed specifically for rapid, reliable DC-DC buck converter implementation using minimal external components and pre-validated magnetics.
FAQ
What is the maximum input voltage rating for LM2672N-3.3/NOPB?
The absolute maximum input voltage for LM2672N-3.3/NOPB is 45 V, but the recommended operating range is 8 V to 40 V. Operation above 40 V risks exceeding internal device stress limits and may trigger thermal shutdown or reduce long-term reliability. For sustained 40-V operation, ensure adequate PCB copper area and airflow to maintain junction temperature below 125°C.
Does LM2672N-3.3/NOPB require external feedback resistors?
No, LM2672N-3.3/NOPB does not require external feedback resistors. As a fixed-output variant, it internally connects the FB pin to a precision 3.3-V reference. The FB pin must be wired directly to the output capacitor's positive terminal for proper regulation-no resistor divider is needed or supported.
Can LM2672N-3.3/NOPB synchronize to an external clock?
Yes, LM2672N-3.3/NOPB supports external clock synchronization via the SYNC pin. When driven with a TTL- or CMOS-compatible signal (0–3.5 V, 400 kHz max), it locks its internal oscillator to the external frequency. Leaving SYNC open defaults to the internal 260-kHz oscillator. Note that current-limit foldback is disabled during sync mode.
What is the thermal performance of LM2672N-3.3/NOPB in PDIP package?
The LM2672N-3.3/NOPB in PDIP-8 has a junction-to-ambient thermal resistance (RθJA) of 95°C/W on a standard 4-layer JEDEC board. At 1-A load and 12-V input, typical power dissipation is ~0.3 W, resulting in ~28.5°C junction rise above ambient-well within the 125°C max rating. No heatsink is required under normal conditions.
How does the ON/OFF pin function on LM2672N-3.3/NOPB?
The ON/OFF pin on LM2672N-3.3/NOPB provides TTL-compatible enable control: pulling it below 0.8 V disables the regulator with 50-μA standby current; driving it above 1.4 V enables operation. An internal 20-μA pull-up allows floating the pin for always-on operation. Voltage must not exceed 6 V to avoid damage.
LM2672N-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 260kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2672N-3.3/NOPB FAQ
1.How can I place an order for LM2672N-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2672N-3.3/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 LM2672N-3.3/NOPB reliable?
The price and inventory of LM2672N-3.3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2672N-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2672N-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2672N-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2672N-3.3/NOPB?
LM2672N-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2672N-3.3/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 LM2672N-3.3/NOPB?
For technical support, including LM2672N-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2672N-3.3/NOPB requirements.
6.How does Aetrix verify that LM2672N-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2672N-3.3/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 LM2672N-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2672N-3.3/NOPB?
All LM2672N-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2672N-3.3/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 LM2672N-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2672N-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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