My Inquiry
My Account
Texas Instruments LM2672MX-3.3/NOPB
- Part No.:
- LM2672MX-3.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2672MX-3.3/NOPB.pdf
- Description:
- IC REG BUCK 3.3V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,534
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2672MX-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 over line and load, 8 V to 40 V input range, and integrated DMOS power switch. It delivers high-efficiency power conversion in industrial control, embedded systems, and point-of-load applications requiring stable low-voltage rails.
For engineers reviewing the LM2672MX-3.3/NOPB datasheet, LM2672MX-3.3/NOPB pinout, LM2672MX-3.3/NOPB application, or LM2672MX-3.3/NOPB equivalent, key selection criteria include its fixed 3.3-V output accuracy, thermal shutdown protection, TTL-compatible ON/OFF control, soft-start capability, and compatibility with standard external components including Schottky diodes and low-ESR output capacitors.
Technical Context
The LM2672MX-3.3/NOPB implements a fixed-frequency PWM buck topology using an internal DMOS power MOSFET switch with 0.3 Ω typical RDS(ON). Its 260-kHz oscillator enables compact filter design with standard 47–68 μH inductors and 47–68 μF tantalum or ceramic output capacitors.
Control features include synchronous soft-start via external capacitor on SS pin, frequency synchronization via SYNC pin (accepting >275 kHz external clocks), and precise feedback regulation via direct FB-to-output connection-no external resistors required for the 3.3-V fixed version. Thermal shutdown and cycle-by-cycle current limiting (1.25–2.1 A) provide fault protection without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1.5% over –40°C to 125°C, enabling reliable logic supply generation without trimming. |
| Input Voltage Range | 8 V to 40 V, supporting wide-input industrial and automotive battery-derived supplies. |
| Max Output Current | 1 A continuous, sufficient for powering microcontrollers, FPGAs, and peripheral ICs in compact designs. |
| Switching Frequency | 260 kHz (±10%), allowing use of small, cost-effective inductors and minimizing EMI below critical bands. |
| Efficiency | Up to 96% at 12 VIN/3.3 VOUT, reducing thermal load and eliminating need for heatsinks on PCB copper traces. |
| Quiescent Current | 3.6 mA typical in active mode; 50 μA in shutdown (ON/OFF = 0 V), enabling low-power standby operation. |
| Protection Features | Thermal shutdown, cycle-by-cycle current limit, and under-voltage lockout ensure robust operation under fault conditions. |
Pinout & Package
LM2672MX-3.3/NOPB is housed 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 Rev L (June 2016).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CB | Bootstrap capacitor connection | Connects 100-nF ceramic capacitor to VSW to fully enhance internal high-side MOSFET gate, minimizing conduction loss. |
| 2 SS | Soft-start timing input | Capacitor from SS to GND sets output voltage ramp time; floating disables soft-start. |
| 3 SYNC | Frequency synchronization input | Accepts external TTL/CMOS clock >275 kHz to align switching frequency; open-circuit defaults to 260 kHz. |
| 4 FB | Feedback sense input | Direct connection to output capacitor provides closed-loop regulation; no external divider needed for fixed 3.3-V version. |
| 5 ON/OFF | Enable/disable control | TTL-compatible input: ≥1.4 V enables regulator; ≤0.8 V disables with 50 μA standby current. |
| 6 GND | Power ground | Primary return path for input/output capacitors and internal switch; shortest possible trace to CIN required. |
| 7 VIN | Input supply | Connects to 8–40 V source and high-frequency bypass capacitor; short, low-inductance path essential for stability. |
| 8 VSW | Switch node output | Drives external inductor and Schottky catch diode; high dv/dt node requiring careful layout and minimal loop area. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | 0.3 Ω RDS(ON) at 25°C enables 1-A output with minimal conduction loss and no external MOSFET required. |
| Patented internal compensation | Eliminates need for external compensation network-only 5 external components required for full buck converter. |
| Fixed 3.3-V output accuracy | ±1.5% tolerance across temperature and load ensures compliance with 3.3-V logic supply requirements (e.g., USB, PCIe, ARM cores). |
| TTL shutdown with low ISTBY | 50 μA shutdown current allows battery-backed systems to maintain weeks of standby life without significant drain. |
| Soft-start and sync capability | Programmable startup ramp prevents inrush current; SYNC pin enables EMI reduction via frequency dithering or system clock alignment. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Powering isolated digital I/O drivers, ADC reference supplies, and CAN transceiver logic rails in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 3.3-V point-of-load regulator converting 24-V rail to logic-level supply with tight transient response. Use Value: ±1.5% output tolerance maintains ADC accuracy; 1-A rating supports multiple parallel I/O channels; thermal shutdown prevents field failure during ambient temperature excursions. |
Use Scenario: Generating 3.3-V supply for microcontroller, LIN transceivers, and sensor interfaces in door module or lighting control units. IC Role / Device Role / Timing Role: Buck converter stepping down 12-V battery-derived input to regulated 3.3-V domain with low quiescent current in sleep mode. Use Value: 50 μA shutdown current extends battery life during vehicle off-state; wide 8–40 V input accommodates cold-crank and load-dump transients. |
| Network Edge Router Board | Medical Diagnostic Handheld |
|
Use Scenario: Providing clean 3.3-V rail for Ethernet PHYs, packet processors, and flash memory in fanless edge infrastructure equipment. IC Role / Device Role / Timing Role: High-efficiency (>90%) intermediate regulator between 48-V PoE-derived input and low-voltage logic domains. Use Value: 96% peak efficiency minimizes heat in sealed enclosures; 260-kHz switching avoids interference with 10/100/1000BASE-T signaling bands. |
Use Scenario: Powering ARM-based SoC, touchscreen controller, and wireless BLE module in portable diagnostic devices with Li-ion battery input. IC Role / Device Role / Timing Role: Main DC-DC converter accepting 7–24 V input (battery + boost stage) and delivering stable 3.3-V core voltage. Use Value: Soft-start prevents voltage droop during power-on sequencing; thermal shutdown protects against overheating during extended ultrasound scanning sessions. |
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 | Same electrical specs and pinout; differs only in RoHS status (LM2672M-3.3 is legacy non-RoHS, LM2672MX-3.3/NOPB is lead-free and RoHS-compliant). | Identical functionality; LM2672M-3.3 may be used where RoHS exemption applies or legacy inventory exists. | Select LM2672MX-3.3/NOPB for new designs requiring RoHS compliance and long-term manufacturability. |
| LM2671MX-3.3/NOPB | Lower 0.5-A output current, 150-kHz switching frequency, and no SYNC pin; otherwise shares same SOIC-8 footprint and FB/ON/OFF interface. | Suitable for lower-power applications (e.g., sensors, wearables); cannot replace LM2672MX-3.3/NOPB in 1-A loads without derating or redesign. | Choose LM2671MX-3.3/NOPB only when 500-mA output suffices and EMI constraints allow lower-frequency operation. |
Compared with LM2672M-3.3, LM2672MX-3.3/NOPB offers guaranteed RoHS compliance and updated manufacturing controls; compared with LM2671MX-3.3/NOPB, it delivers double the output current and higher switching frequency for tighter regulation and smaller magnetics-making it the sole choice for 1-A, space-constrained, thermally sensitive applications.
Availability
LM2672MX-3.3/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical device applications requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for LM2672MX-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 LM2672MX-3.3/NOPB belongs to TI's SIMPLE SWITCHER® family-designed specifically for ease-of-use, minimal external component count, and robust performance in industrial, automotive, and communications power supplies.
FAQ
What is the maximum input voltage rating for LM2672MX-3.3/NOPB?
The absolute maximum input voltage for LM2672MX-3.3/NOPB is 45 V, but the recommended operating range is 8 V to 40 V. Exceeding 40 V continuously risks violating thermal limits and degrading long-term reliability, even if within absolute max ratings. For 48-V systems, a pre-regulator stage is advised before LM2672MX-3.3/NOPB.
Does LM2672MX-3.3/NOPB require external feedback resistors?
No, LM2672MX-3.3/NOPB does not require external feedback resistors. As a fixed-output variant, it uses internal resistor dividers tied to the FB pin; the FB pin must be connected directly to the output capacitor for regulation. External resistors are only needed for the adjustable-version LM2672MX-ADJ.
Can LM2672MX-3.3/NOPB synchronize to an external clock?
Yes, LM2672MX-3.3/NOPB supports external clock synchronization via the SYNC pin. An external TTL/CMOS signal above 275 kHz (e.g., 300–400 kHz) can be AC-coupled to SYNC to force switching alignment-useful for EMI reduction or multi-rail phase control. Leaving SYNC open defaults to the internal 260-kHz oscillator.
What thermal considerations apply to LM2672MX-3.3/NOPB in SOIC-8 package?
LM2672MX-3.3/NOPB in SOIC-8 has a junction-to-ambient thermal resistance (RθJA) of 105°C/W. At 1-A load and 12-V input, typical power dissipation is ~0.3 W; this yields ~32°C rise above ambient-manageable with standard 2-oz copper pours. No heatsink is required, but thermal vias under the GND pad improve performance.
Is LM2672MX-3.3/NOPB pin-compatible with LM2672MX-5.0/NOPB?
Yes, LM2672MX-3.3/NOPB is fully pin-compatible with LM2672MX-5.0/NOPB, LM2672MX-12/NOPB, and LM2672MX-ADJ-all share identical SOIC-8 pinout, FB/ON/OFF/SYNC/SS interface behavior, and thermal characteristics. Only the internal feedback ratio differs; no PCB changes are needed when swapping fixed-output variants.
LM2672MX-3.3/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LM2672MX-3.3/NOPB FAQ
1.How can I place an order for LM2672MX-3.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2672MX-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 LM2672MX-3.3/NOPB reliable?
The price and inventory of LM2672MX-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 LM2672MX-3.3/NOPB is usually 5 days.
3.What payment methods are accepted for LM2672MX-3.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2672MX-3.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2672MX-3.3/NOPB?
LM2672MX-3.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2672MX-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 LM2672MX-3.3/NOPB?
For technical support, including LM2672MX-3.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2672MX-3.3/NOPB requirements.
6.How does Aetrix verify that LM2672MX-3.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2672MX-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 LM2672MX-3.3/NOPB meets industry standards.
7.What is the process for return or replacement of LM2672MX-3.3/NOPB?
All LM2672MX-3.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2672MX-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 LM2672MX-3.3/NOPB part is unused and in its original packaging.
Return procedure for LM2672MX-3.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2672MX-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…
