My Inquiry
My Account
Texas Instruments LM2672N-5.0
- Part No.:
- LM2672N-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2672N-5.0.pdf
- Description:
- IC REG BUCK 5V 1A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,361
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2672N-5.0 from National Semiconductor is a monolithic 1A step-down (buck) DC-DC voltage regulator in an 8-pin DIP package, featuring fixed 5.0V output, 260 kHz fixed-frequency switching, ±1.5% output voltage tolerance over line and load, 0.25Ω DMOS output switch, and wide 8V–40V input range. It delivers high-efficiency power conversion for industrial control and embedded power rails.
For engineers reviewing the LM2672N-5.0 datasheet, LM2672N-5.0 pinout, LM2672N-5.0 application, or LM2672N-5.0 equivalent, key selection criteria include guaranteed 1A output current, thermal shutdown and current limit protection, TTL-compatible shutdown, soft-start capability, and compatibility with standard off-the-shelf inductors and Schottky diodes.
Technical Context
The LM2672N-5.0 integrates a DMOS power switch, internal frequency compensation (Patents 5,382,918 and 5,514,947), fixed 260 kHz oscillator, and soft-start circuitry. Its architecture eliminates need for external compensation networks and supports frequency synchronization via pin 3.
It operates in continuous conduction mode with duty cycle up to 95%, uses external catch diode and inductor for energy transfer, and features internal current limiting (1.25–2.2 A) and thermal shutdown for fault protection under overload or overtemperature conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.5% over full line (8–40 V) and load (20 mA–1 A) range - ensures stable logic supply without trimming. |
| Max Output Current | 1 A guaranteed - supports microcontroller cores, FPGAs, and peripheral ICs requiring robust 5V rail. |
| Switching Frequency | 260 kHz (±10%) - enables use of compact 33–68 μH inductors and reduces EMI compared to lower-frequency buck converters. |
| Input Voltage Range | 6.5 V to 40 V - accommodates unregulated 12V/24V industrial bus inputs with margin for transients. |
| Efficiency | 90% typical at VIN = 12 V, IOUT = 1 A - minimizes heat dissipation; PCB copper traces suffice as heatsink. |
| Quiescent Current | 2.5 mA typical - low operating bias enables efficient light-load performance in always-on systems. |
| Standby Current | 50 μA typical with ON/OFF pin low - supports ultra-low-power sleep modes in battery-backed applications. |
| Switch RDS(ON) | 0.25 Ω typical - reduces conduction loss and improves efficiency at high load currents. |
Pinout & Package
LM2672N-5.0 is housed in an 8-pin plastic dual in-line package (DIP), with through-hole mounting and 0.3-inch lead spacing. Thermal resistance θJA is 95°C/W with ~1 in² copper area.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Input Power Supply | Accepts 6.5–40 V DC; requires local 22 μF tantalum bypass capacitor near pin. |
| 2 (GND) | Power Ground | Common return for input/output capacitors, inductor, and catch diode; must connect to low-impedance ground plane. |
| 3 (SYNC) | Frequency Synchronization Input | Accepts external clock signal (up to 400 kHz); enables noise reduction via spread-spectrum or multi-regulator sync. |
| 4 (FB) | Feedback Input (N/A for fixed 5.0V) | Internally connected to 5.0V reference; not accessible-no external resistor divider required. |
| 5 (SW) | Switch Node | Drives external catch diode anode and inductor; high dv/dt node requiring short, direct routing to minimize EMI. |
| 6 (BOOST) | Bootstrap Capacitor Terminal | Connects 0.01 μF ceramic capacitor between SW and BOOST to gate-drive internal DMOS switch fully. |
| 7 (ON/OFF) | Enable/Shutdown Control | TTL-compatible input; <0.8 V disables regulator (50 μA standby), >2.0 V enables operation. |
| 8 (VOUT) | Regulated Output | Delivers fixed 5.0 V ±1.5%; requires 47–68 μF low-ESR output capacitor (e.g., Sprague 595D or AVX TPS). |
Key Features
| Feature | Design Value |
|---|---|
| Patented internal frequency compensation | Eliminates external compensation components and simplifies design validation across input/load variations. |
| Soft-start function | Controls output ramp rate via external capacitor on SS pin; prevents inrush current and output overshoot during startup. |
| Thermal shutdown + current limit | Protects device under sustained overload or ambient temperature >125°C; auto-recovery after fault removal. |
| Frequency synchronization | Allows multiple LM2672N-5.0 regulators to operate at same switching frequency, reducing beat frequencies and system-level EMI. |
| Standard inductor compatibility | Works with off-the-shelf 33–68 μH inductors from Schott, Renco, Pulse, and Coilcraft-no custom magnetics needed. |
| Computer-aided design support | LM267X Made Simple v6.0 software automates component selection, efficiency estimation, and layout guidance for rapid prototyping. |
Applications
| Industrial PLC Power Supply | Embedded System Pre-Regulator |
|---|---|
|
Use Scenario: Providing clean, regulated 5V power to microcontrollers and I/O drivers inside programmable logic controllers operating from noisy 24V DC field buses. IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated 24V to isolated 5V rail; handles input transients and load steps without dropout. Use Value: 90% efficiency and thermal shutdown ensure reliable operation in enclosed cabinets without forced cooling; ±1.5% tolerance maintains MCU timing integrity. |
Use Scenario: Generating stable 5V intermediate rail from higher-voltage source (e.g., 12V or 24V) before feeding low-noise LDOs for analog sensors or ADCs. IC Role / Device Role / Timing Role: High-efficiency pre-regulator reducing power loss prior to final linear regulation; operates at fixed 260 kHz for predictable noise filtering. Use Value: Reduces total system heat by >3W vs. linear solution; soft-start prevents voltage spikes that could disrupt downstream LDOs or reference circuits. |
| Point-of-Load Converter for FPGA Boards | Automated Test Equipment (ATE) Power Module |
|
Use Scenario: Delivering 1A @ 5V to FPGA configuration circuitry and auxiliary logic on compact test board where space and thermal budget are constrained. IC Role / Device Role / Timing Role: Compact, self-contained buck converter using DIP footprint and standard passive components; no external compensation required. Use Value: 8-pin DIP allows manual soldering and easy replacement; 0.25Ω RDS(ON) and 90% efficiency minimize board-level heating near sensitive digital components. |
Use Scenario: Powering mixed-signal measurement subsystems (DACs, op-amps, relays) in benchtop ATE where long-term stability and repeatable turn-on behavior are critical. IC Role / Device Role / Timing Role: Fixed-output regulator with precise ±1.5% tolerance and controlled soft-start timing-ensures consistent power-up sequencing across thousands of test cycles. Use Value: Standby current of 50 μA enables low-power sleep states; SYNC pin allows synchronization with system clock to avoid interference with precision analog measurements. |
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-5.0 | Same silicon die in SO-8 surface-mount package; θJA = 105°C/W vs. 95°C/W for DIP; no through-hole leads. | Preferred for automated assembly and space-constrained PCBs; less suitable for prototyping or high-reliability through-hole designs. | Select LM2672MX-5.0 when volume production, reflow compatibility, or smaller footprint is prioritized over manual serviceability. |
| LM2576-5.0 | Lower 52 kHz switching frequency; larger inductor/capacitor requirements; 3A output rating but higher quiescent current (5.5 mA). | Better suited for cost-sensitive, low-EMI, or high-current (>1A) applications where size is secondary to BOM cost. | Choose LM2576-5.0 only if 52 kHz operation simplifies EMI filtering or if 3A headroom justifies higher idle power and larger passives. |
Compared with LM2672MX-5.0, the LM2672N-5.0 offers superior thermal performance in through-hole layouts and easier hand-soldering, while LM2576-5.0 trades switching efficiency and component size for broader legacy design familiarity and higher peak current capability.
Availability
LM2672N-5.0 is available at Aetrix Electronics and suitable for industrial control systems, embedded instrumentation, automated test equipment, and FPGA power management requiring stable component supply and long-lifecycle support.
Supply support for LM2672N-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
National Semiconductor was a U.S.-based semiconductor company specializing in analog and power management ICs, acquired by Texas Instruments in 2011. Its SIMPLE SWITCHER® portfolio defined industry standards for ease-of-use in DC-DC conversion.
The LM2672 series was designed specifically for engineers needing fast, reliable, and component-minimal buck regulator solutions for industrial, telecom, and embedded applications-emphasizing ruggedness, thermal resilience, and out-of-the-box performance.
FAQ
What is the maximum input voltage rating for the LM2672N-5.0?
The absolute maximum input voltage for the LM2672N-5.0 is 45 V, but the recommended operating range is 6.5 V to 40 V DC. Exceeding 40 V may compromise long-term reliability or trigger overvoltage stress on internal DMOS structures, even if within absolute max ratings. The LM2672N-5.0 datasheet specifies guaranteed performance only within the 6.5–40 V operating range.
Does the LM2672N-5.0 require an external feedback resistor network?
No, the LM2672N-5.0 does not require external feedback resistors because it is a fixed-output version with internal 5.0 V reference and feedback path. Pin 4 (FB) is internally connected and not accessible; adding external resistors would disrupt regulation and is not supported. This simplifies layout and eliminates drift-related tolerance errors inherent in discrete resistor dividers.
Can the LM2672N-5.0 be synchronized to an external clock?
Yes, the LM2672N-5.0 supports frequency synchronization via its SYNC pin (pin 3). Applying a square-wave signal with ≥3 VPP and frequency up to 400 kHz locks the internal 260 kHz oscillator to the external source. This feature enables EMI reduction in multi-rail systems and avoids beat frequencies-critical in sensitive measurement or communication equipment using the LM2672N-5.0.
What type of catch diode is recommended for use with the LM2672N-5.0?
A Schottky diode rated for ≥3.3 A average current and ≥50 V reverse voltage is recommended, such as the IR 30WQ05F (50 V, 3.3 A) or equivalent. Schottky diodes minimize forward voltage drop and switching losses, directly improving efficiency. The LM2672N-5.0 datasheet specifies placement close to the IC with short traces to reduce ringing and EMI-critical for stable 260 kHz operation.
How does thermal performance differ between the LM2672N-5.0 and LM2672M-5.0 packages?
The LM2672N-5.0 (8-pin DIP) has a junction-to-ambient thermal resistance (θJA) of 95°C/W with ~1 in² copper, while the LM2672M-5.0 (SO-8) is rated at 105°C/W under identical conditions. This 10°C/W difference means the DIP package dissipates heat more effectively in through-hole layouts, allowing higher continuous output current in thermally constrained environments without additional heatsinking.
LM2672N-5.0 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):
- 5V
- 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-5.0 FAQ
1.How can I place an order for LM2672N-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2672N-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 LM2672N-5.0 reliable?
The price and inventory of LM2672N-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 LM2672N-5.0 is usually 5 days.
3.What payment methods are accepted for LM2672N-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2672N-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2672N-5.0?
LM2672N-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2672N-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 LM2672N-5.0?
For technical support, including LM2672N-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2672N-5.0 requirements.
6.How does Aetrix verify that LM2672N-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2672N-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 LM2672N-5.0 meets industry standards.
7.What is the process for return or replacement of LM2672N-5.0?
All LM2672N-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2672N-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 LM2672N-5.0 part is unused and in its original packaging.
Return procedure for LM2672N-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2672N-5.0 Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
