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Texas Instruments LM2672LD-3.3/NOPB
- Part No.:
- LM2672LD-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM2672LD-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A 16WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2672LD-3.3/NOPB from Texas Instruments (formerly National Semiconductor) is a monolithic 1A step-down DC/DC switching regulator in LLP-16 package, delivering fixed 3.3V output with ±1.5% tolerance over line and load, 260 kHz fixed-frequency operation, 0.25Ω DMOS switch, and wide 8–40V input range. It enables high-efficiency (>90%) power conversion in industrial control modules requiring compact, thermally robust local regulation.
For engineers reviewing the LM2672LD-3.3/NOPB datasheet, LM2672LD-3.3/NOPB pinout, LM2672LD-3.3/NOPB application, or LM2672LD-3.3/NOPB equivalent, key selection criteria include guaranteed 1A output current, internal soft-start and frequency synchronization capability, thermal shutdown protection, and compatibility with standard off-the-shelf inductors and Schottky catch diodes.
Technical Context
The LM2672LD-3.3/NOPB integrates a 0.25Ω DMOS power switch, 260 kHz oscillator, internal frequency compensation (Patents 5,382,918 & 5,514,947), and TTL-compatible ON/OFF control with 50 μA standby current. Its architecture supports continuous-mode buck operation with external components limited to inductor, catch diode, input/output capacitors, and boost capacitor.
It features built-in protections including cycle-by-cycle current limiting, thermal shutdown, and soft-start via external capacitor. Frequency synchronization allows operation up to 400 kHz for smaller passive component sizing, while the 3.3V feedback reference is internally trimmed and does not require external resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% over full temperature and load range - ensures stable logic supply for microcontrollers and FPGAs without trimming. |
| Max Output Current | 1A continuous - supports single-rail powering of mid-power digital subsystems without external current boosting. |
| Input Voltage Range | 8V to 40V - accommodates unregulated 12V/24V industrial rails and automotive battery transients. |
| Switching Frequency | 260 kHz (±10%) - enables use of low-cost, widely available 33–68 μH inductors and reduces EMI compared to lower-frequency alternatives. |
| Efficiency | 86% at VIN = 12V, IOUT = 1A - minimizes board-level heat generation; copper PCB traces suffice as heatsink. |
| Quiescent Current | 2.5 mA typical - maintains low no-load power draw in always-on systems. |
| Standby Current | 50 μA typical during shutdown - enables ultra-low-power sleep modes in battery-backed applications. |
| Thermal Protection | Internal thermal shutdown at TJ ≥ +150°C - prevents damage during overload or poor airflow conditions. |
Pinout & Package
LM2672LD-3.3/NOPB uses the 16-pin LLP (Leadless Leadframe Package) with exposed thermal pad, per NSC Package Drawing LDA16A. The package supports enhanced thermal dissipation via PCB copper area under the pad and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 8–40V DC; requires local 22 μF tantalum bypass capacitor near pin to suppress input transients. |
| GND | Power Ground | Common return for input/output paths and IC substrate; must connect directly to thermal pad and low-impedance ground plane. |
| VOUT | Regulated Output | Delivers fixed 3.3V; connects to output capacitor (e.g., 68 μF tantalum) and load; ripple < 20 mV peak-to-peak typical. |
| SW | Switch Node | Drives external catch diode anode and inductor; switches between VIN and GND at 260 kHz; requires short, low-inductance routing. |
| BOOST | Bootstrap Capacitor Terminal | Connects to 0.01 μF ceramic capacitor between SW and BOOST to gate-drive the internal DMOS switch fully. |
| SYNC | Frequency Synchronization Input | Accepts external 400 kHz square wave (3.5V threshold); overrides internal oscillator for EMI reduction or multi-rail synchronization. |
| ON/OFF | Enable/Shutdown Control | TTL-compatible; <0.8V disables regulator (50 μA standby); >2.0V enables; open-circuit defaults to enabled. |
| SS | Soft-Start Timing Input | Connects to external capacitor to control startup ramp time; 0.01–0.033 μF yields ~1–10 ms rise; avoids output overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.25Ω DMOS Switch | Eliminates need for external MOSFET and driver; reduces BOM count and layout complexity while maintaining >90% efficiency. |
| Patented Internal Compensation | Removes requirement for external compensation network; simplifies design and improves stability across all operating conditions. |
| 260 kHz Fixed-Frequency Operation | Enables predictable EMI filtering and consistent inductor sizing; supports use of cost-effective, standardized 33–68 μH inductors. |
| External Frequency Synchronization | Allows coordination with other switching regulators to avoid beat frequencies and reduce system-level conducted emissions. |
| Thermal Shutdown + Current Limit | Provides fault containment without external circuitry; protects against short-circuit, overtemperature, and inductor saturation events. |
| LLP-16 Thermal Pad Package | Offers superior thermal resistance vs. SO-8/DIP; enables higher power density when paired with ≥1 in² PCB copper area under pad. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Local 3.3V rail generation for microcontroller, CAN transceiver, and analog sensor interface in DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24V field bus to clean 3.3V logic supply with tight voltage regulation and transient immunity. Use Value: ±1.5% output tolerance and 1A capability ensure reliable MCU boot and sensor ADC accuracy across -40°C to +85°C ambient. |
Use Scenario: Powering infotainment SoC peripherals and LIN transceivers from vehicle battery (9–16V nominal, up to 40V load dump). IC Role / Device Role / Timing Role: High-efficiency pre-regulator feeding low-dropout linear regulators for noise-sensitive audio and RF sections. Use Value: 8–40V input range and thermal shutdown withstand automotive transients; 260 kHz switching avoids AM band interference. |
| Network Edge Router Board | Medical Diagnostic Sensor Interface |
Use Scenario: Generating isolated 3.3V supply for Ethernet PHY and packet buffer memory on multi-layer telecom backplane. IC Role / Device Role / Timing Role: Compact, high-current DC/DC stage minimizing board space while meeting IPC-2221 creepage/clearance requirements. Use Value: LLP-16 package and minimal external parts (5 total) reduce footprint vs. discrete buck solutions; soft-start prevents inrush into large memory banks. |
Use Scenario: Providing regulated 3.3V for precision ADC front-end, optical sensor array, and low-power MCU in portable diagnostic device. IC Role / Device Role / Timing Role: Low-noise, thermally stable power source where efficiency and reliability outweigh ultra-low quiescent current needs. Use Value: 86% efficiency at 1A reduces self-heating in sealed enclosure; ±1.5% tolerance ensures calibrated sensor readings remain within spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2672M-3.3/NOPB | SO-8 package; higher θJA (105°C/W vs. LLP's ~45°C/W); same electrical specs. | Better suited for prototyping or low-power designs where thermal margin is ample and through-hole/SO-8 assembly is preferred. | Select when thermal constraints allow and SO-8 footprint matches existing layout; avoid for >0.7A continuous loads in confined spaces. |
| TPS5430DDAR | 3.0–36V input; 3A output; 500 kHz switching; integrated high-side FET; different pinout and compensation method. | Higher current and frequency enable smaller magnetics but require re-optimization of loop stability and layout. | Choose for designs needing >1A or tighter size constraints; verify feedback divider, soft-start, and thermal layout changes are feasible. |
Compared with LM2672M-3.3/NOPB, the LM2672LD-3.3/NOPB offers significantly better thermal performance in high-density layouts, while TPS5430DDAR provides higher output current and frequency flexibility at the cost of increased design complexity and non-drop-in replacement.
Availability
LM2672LD-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and network infrastructure applications requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for LM2672LD-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 acquired National Semiconductor in 2011 and continues to support the SIMPLE SWITCHER® portfolio, known for rugged, easy-to-use power management ICs targeting industrial and automotive markets.
The LM2672 series was designed specifically for high-reliability, medium-current DC/DC conversion in harsh environments-emphasizing simplicity, thermal robustness, and compatibility with standard passive components.
FAQ
What is the maximum input voltage rating for the LM2672LD-3.3/NOPB?
The absolute maximum input voltage for the LM2672LD-3.3/NOPB is 45V, but the recommended operating range is 8V to 40V. Exceeding 40V may compromise long-term reliability or trigger overvoltage stress on internal circuitry, even if thermal limits are maintained. Always observe derating guidelines in TI's application notes for sustained operation near upper limits.
Does the LM2672LD-3.3/NOPB require an external feedback resistor divider?
No, the LM2672LD-3.3/NOPB does not require an external feedback resistor divider because it is a fixed-output variant with the 3.3V regulation point internally trimmed and referenced. Unlike the adjustable LM2672LD-ADJ version, this part uses a dedicated internal feedback network, eliminating two external resistors and associated tolerance errors.
Can the LM2672LD-3.3/NOPB be synchronized to an external clock?
Yes, the LM2672LD-3.3/NOPB supports external frequency synchronization via its SYNC pin (Pin 3). Applying a 400 kHz square wave with ≥3.5V threshold and 50% duty cycle forces the internal oscillator to lock to that frequency, enabling EMI reduction and multi-rail timing coordination without modifying the LM2672LD-3.3/NOPB's core functionality.
What thermal considerations apply to the LM2672LD-3.3/NOPB in LLP-16 package?
The LM2672LD-3.3/NOPB's LLP-16 package relies on PCB copper area under its exposed thermal pad for heat dissipation. TI recommends ≥1 in² of 2-oz copper connected via ≥4 thermal vias to inner ground planes. Without adequate copper, junction temperature can exceed +150°C at full 1A load, triggering thermal shutdown. AN-1187 provides detailed layout guidance.
Which catch diode is recommended for use with the LM2672LD-3.3/NOPB?
The LM2672LD-3.3/NOPB datasheet recommends a 3.3A, 50V Schottky rectifier such as the IR 30WQ05F. This diode meets the required average current (≥1.3× load current), reverse voltage rating (≥1.25× max VIN), and fast recovery characteristics needed to maintain high efficiency and minimize switching losses in the buck topology.
LM2672LD-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-WFDFN 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):
- 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:
- Surface Mount
- Supplier Device Package:
- 16-WSON (5x5)
LM2672LD-3.3/NOPB FAQ
1.How can I place an order for LM2672LD-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2672LD-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 LM2672LD-3.3/NOPB reliable?
The price and inventory of LM2672LD-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 LM2672LD-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2672LD-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2672LD-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2672LD-3.3/NOPB?
LM2672LD-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2672LD-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 LM2672LD-3.3/NOPB?
For technical support, including LM2672LD-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2672LD-3.3/NOPB requirements.
6.How does Aetrix verify that LM2672LD-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2672LD-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 LM2672LD-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2672LD-3.3/NOPB?
All LM2672LD-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2672LD-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 LM2672LD-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2672LD-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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