My Inquiry
My Account
Texas Instruments LM2672M-3.3/NOPB
- Part No.:
- LM2672M-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2672M-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:523
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2672M-3.3/NOPB from Texas Instruments is a monolithic 1-A step-down (buck) DC-DC switching regulator with fixed 3.3-V output, 260-kHz internal oscillator, ±1.5% output voltage tolerance, 8 V to 40 V input range, and integrated DMOS power switch. It delivers high-efficiency power conversion in industrial control modules requiring stable low-voltage rails.
For engineers reviewing the LM2672M-3.3/NOPB datasheet, LM2672M-3.3/NOPB pinout, LM2672M-3.3/NOPB application, or LM2672M-3.3/NOPB equivalent, key selection criteria include output accuracy under load/line variation, thermal performance in SOIC-8, soft-start control via external capacitor, and compatibility with standard Schottky catch diodes and 47–68 µH inductors.
Technical Context
The LM2672M-3.3/NOPB implements a fixed-frequency PWM controller with internal 260-kHz oscillator driving a DMOS high-side switch, enabling continuous-mode operation up to 1 A. Its feedback loop uses direct connection of FB to output for fixed 3.3-V regulation, eliminating external resistor dividers.
Functional modes include TTL-compatible ON/OFF control (1.4-V threshold), soft-start via SS pin current (4.5 µA typ), and SYNC input for external clock injection above 275 kHz. Protection includes cycle-by-cycle current limiting (1.25–2.1 A), thermal shutdown, and 50 µA standby current when disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1.5% over line, load, and temperature (–40°C to 125°C) |
| Input Voltage Range | 6.5 V to 40 V - supports wide industrial supply rails including 12-V, 24-V, and 36-V systems |
| Max Output Current | 1 A continuous - sufficient for powering microcontrollers, FPGAs, and interface ICs |
| Switching Frequency | 260 kHz fixed - enables use of compact 47–68 µH inductors and reduces EMI compared to lower-frequency buck regulators |
| Efficiency | 86% at VIN = 12 V, IOUT = 1 A - minimizes thermal stress on PCB copper traces without heatsinking |
| Quiescent Current | 3.6 mA typical - ensures low no-load power draw in always-on subsystems |
| Standby Current | 50 µA max - enables ultra-low-power shutdown for battery-backed applications |
Pinout & Package
LM2672M-3.3/NOPB is supplied in an 8-pin SOIC package (5.00 mm × 6.20 mm body size) with exposed pad not present. Pin functions are validated per TI SNVS136L datasheet Figure 3 (SOIC top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CB | Bootstrap capacitor connection | Connects 100-nF ceramic capacitor to VSW to gate-drive high-side DMOS switch fully ON, minimizing RDS(on) conduction loss |
| 2 SS | Soft-start control | Sinks 4.5 µA to GND; external capacitor sets output voltage ramp time and limits inrush current during startup |
| 3 SYNC | Frequency synchronization input | Accepts external TTL/CMOS clock >275 kHz to align switching frequency across multiple converters and reduce beat frequencies |
| 4 FB | Feedback sense input | Internally tied to 3.3-V reference; connect directly to output capacitor for fixed-output regulation - no external resistors required |
| 5 ON/OFF | Enable/disable control | TTL-compatible input; <1.4 V disables regulator with 50 µA standby current; floating or >1.4 V enables operation |
| 6 GND | Power ground | Main return path for input capacitor (CIN), output capacitor (COUT), and internal switch - requires short, low-inductance PCB trace |
| 7 VIN | Input supply | Connects to 6.5–40 V source and high-frequency bypass capacitor; path to CIN and GND must be minimized for stability |
| 8 VSW | Switch node output | Drives external inductor and Schottky catch diode cathode; swings between VIN and ~–0.5 V during switching - critical for EMI layout |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | Eliminates need for external MOSFET and driver; RDS(on) = 0.3 Ω max ensures <300 mW conduction loss at 1 A |
| Internal frequency compensation | Enables stable operation with only 5 external components (inductor, diode, CIN, COUT, CCB) - no loop compensation design required |
| Thermal shutdown + current limit | Protects against sustained overload or short-circuit without external circuitry; foldback reduces switching frequency below 100 kHz under extreme fault |
| Soft-start with programmable ramp | SS pin current (4.5 µA) charges external capacitor to linearly ramp output voltage - prevents input surge and output overshoot |
| TTL shutdown with 50 µA standby | Allows system-level power sequencing; low standby current extends battery life in portable or backup power applications |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Powering isolated digital I/O drivers, analog sensor interfaces, and CAN transceivers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator supplying logic rails for microcontrollers and peripheral ICs. Use Value: ±1.5% output tolerance ensures reliable ADC reference and digital logic operation across –40°C to 85°C ambient; 260-kHz switching allows compact 68-µH inductor placement in space-constrained enclosures. | Use Scenario: Generating 3.3-V supply for infotainment head unit microprocessors and display timing controllers. IC Role / Device Role / Timing Role: Secondary DC-DC stage stepping down 12-V battery rail to clean 3.3-V domain for SoC core logic. Use Value: 86% efficiency at 12-V input minimizes heat buildup near temperature-sensitive displays; SYNC input enables EMI filtering alignment with other vehicle subsystems. |
| Point-of-Load for FPGA Boards | Medical Diagnostic Sensor Front-Ends |
Use Scenario: Delivering regulated 3.3-V power to FPGA configuration memory, transceivers, and I/O banks on high-density PCBs. IC Role / Device Role / Timing Role: Local point-of-load converter placed adjacent to FPGA BGA package for low-noise, low-impedance supply. Use Value: 1-A capability meets peak FPGA I/O bank current demands; SOIC-8 footprint simplifies thermal management using PCB copper pour as heatsink. | Use Scenario: Supplying precision analog front-end (AFE) circuits in portable ultrasound or ECG devices where low noise and reliability are critical. IC Role / Device Role / Timing Role: Isolated 3.3-V rail generator feeding ADC reference buffers and op-amp signal chains. Use Value: Direct FB-to-output connection eliminates resistor divider drift errors; 50 µA shutdown current preserves battery charge during standby monitoring cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2672-3.3 | Same electrical specs and pinout; differs only in RoHS compliance status (LM2672-3.3 lacks /NOPB suffix and may contain lead) | Not suitable for new designs targeting RoHS-compliant manufacturing or export to EU/China markets | Select LM2672M-3.3/NOPB for lead-free assembly and full regulatory compliance. |
| LM2675M-3.3 | Higher 2.2-A output current, same 260-kHz frequency, but requires larger external components and has higher quiescent current (5.5 mA) | Better suited for applications needing >1 A or higher transient response margin, but less optimal for space- or efficiency-constrained 1-A designs | Choose LM2672M-3.3/NOPB when 1-A rating, 3.6-mA IQ, and minimal BOM count are prioritized. |
Compared with LM2672-3.3 and LM2675M-3.3, the LM2672M-3.3/NOPB offers guaranteed RoHS compliance, optimized 1-A efficiency, and lowest external component count - making it ideal for cost-sensitive, thermally constrained, and environmentally regulated industrial power supplies.
Availability
LM2672M-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, FPGA power delivery, and medical sensor modules requiring stable component supply and long-term manufacturability.
Supply support for LM2672M-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 company specializing in analog, embedded processing, and power management technologies, with decades of leadership in power conversion ICs.
The LM2672 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use, minimal external component count, and robust operation in industrial and automotive power supply applications.
FAQ
What is the maximum input voltage rating for LM2672M-3.3/NOPB?
The absolute maximum input voltage for LM2672M-3.3/NOPB is 45 V, but the recommended operating range is 6.5 V to 40 V per the datasheet. Operation above 40 V risks exceeding safe junction temperature or violating SOIC package thermal limits. For reliable long-term use in 36-V industrial systems, LM2672M-3.3/NOPB operates within specification with appropriate input capacitance and PCB thermal relief.
Does LM2672M-3.3/NOPB require external feedback resistors?
No, LM2672M-3.3/NOPB does not require external feedback resistors. As a fixed 3.3-V output variant, it integrates internal resistor dividers and references - the FB pin is connected directly to the output capacitor. This eliminates resistor tolerance errors and simplifies layout. External resistors are only needed for the adjustable version (LM2672ADJ).
Can LM2672M-3.3/NOPB synchronize to an external clock?
Yes, LM2672M-3.3/NOPB supports external clock synchronization via the SYNC pin. An external TTL/CMOS clock signal >275 kHz can be AC-coupled to SYNC to force the switching frequency, enabling EMI reduction through frequency alignment. Note that current-limit frequency foldback is disabled during SYNC operation, so short-circuit protection relies solely on cycle-by-cycle current limiting.
What is the thermal resistance (RθJA) of LM2672M-3.3/NOPB in SOIC-8 package?
The junction-to-ambient thermal resistance (RθJA) for LM2672M-3.3/NOPB in the SOIC-8 (D) package is 105°C/W, measured on a standard 4-layer JEDEC board. This value assumes proper PCB copper pour on the GND pins and minimal trace length for VIN and VSW. With 86% efficiency at 1 A, thermal rise remains within safe limits using PCB copper as the sole heatsink - no additional heatsink required.
How does the soft-start function work on LM2672M-3.3/NOPB?
The soft-start function on LM2672M-3.3/NOPB is controlled by the SS pin, which sinks a constant 4.5 µA current (typical) to charge an external capacitor. The rising voltage on this capacitor linearly ramps the internal reference, causing the output voltage to rise smoothly. A 100-nF capacitor yields ~22 ms ramp time. Leaving SS open disables soft-start, resulting in immediate full output - useful in non-critical applications but risking inrush current.
LM2672M-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- 8-SOIC
LM2672M-3.3/NOPB FAQ
1.How can I place an order for LM2672M-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2672M-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 LM2672M-3.3/NOPB reliable?
The price and inventory of LM2672M-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 LM2672M-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2672M-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2672M-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2672M-3.3/NOPB?
LM2672M-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2672M-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 LM2672M-3.3/NOPB?
For technical support, including LM2672M-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2672M-3.3/NOPB requirements.
6.How does Aetrix verify that LM2672M-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2672M-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 LM2672M-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2672M-3.3/NOPB?
All LM2672M-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2672M-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 LM2672M-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2672M-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2672M-3.3/NOPB 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…
