Texas Instruments LM2672N-12/NOPB

Overview

LM2672N-12/NOPB from Texas Instruments is a monolithic 1-A step-down (buck) DC-DC voltage regulator with fixed 12-V output, 8 V to 40 V input range, 260-kHz fixed-frequency switching, ±1.5% output voltage tolerance, and integrated DMOS power MOSFET. It delivers high-efficiency power conversion in industrial power supplies and embedded systems requiring stable mid-range output voltage.

For engineers reviewing the LM2672N-12/NOPB datasheet, LM2672N-12/NOPB pinout, LM2672N-12/NOPB application, or LM2672N-12/NOPB equivalent, key selection criteria include confirmed 12-V fixed output, thermal shutdown protection, TTL-compatible ON/OFF control, soft-start capability, and SOIC-8 package compatibility with standard PCB layout practices.

Technical Context

The LM2672N-12/NOPB implements a fixed-frequency PWM controller with internal 260-kHz oscillator driving an integrated DMOS high-side switch. Its feedback loop uses direct connection of the FB pin to the output capacitor for regulation-no external resistors required-enabling precise 12-V output with ±1.5% tolerance across line and load.

Functional modes include active operation above 1.4 V on ON/OFF pin (with 50 μA standby current when pulled low), soft-start via external capacitor on SS pin, and optional frequency synchronization via SYNC pin. Protection includes cycle-by-cycle current limiting (1.25–2.1 A), thermal shutdown, and under-voltage lockout.

Key Specifications

Pinout & Package

LM2672N-12/NOPB is packaged in an 8-pin SOIC (D package) with 5.00 mm × 6.20 mm body size and standard 1.27-mm lead pitch. Thermal resistance is R_θJA = 105°C/W on JEDEC 4-layer board.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Compared with LM2672MX-12/NOPB, the LM2672N-12/NOPB offers identical performance in tube packaging for flexibility in small-batch development, while LM2576T-12 provides higher current at the cost of reduced integration, higher EMI, and no synchronization capability.

Availability

LM2672N-12/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded control units, test equipment front-ends, and automotive aftermarket modules requiring stable component supply and long-term manufacturability.

Supply support for LM2672N-12/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 over 90 years of innovation history.

The LM2672 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically for engineers needing robust, easy-to-implement DC-DC solutions with minimal external components and high reliability in industrial and embedded environments.

FAQ

What is the maximum input voltage rating for LM2672N-12/NOPB?

The absolute maximum input voltage for LM2672N-12/NOPB is 45 V, but the recommended operating range is 8 V to 40 V. Operation above 40 V risks exceeding safe junction temperature or triggering internal protection circuits. For automotive cold-crank scenarios down to 6.5 V, the device remains functional but output regulation may degrade below 8 V - always verify minimum duty cycle requirements in your specific application.

Does LM2672N-12/NOPB require external feedback resistors?

No, LM2672N-12/NOPB does not require external feedback resistors. As a fixed 12-V output variant, it uses internal precision resistors connected to the FB pin, which must be wired directly to the output capacitor for regulation. This eliminates resistor tolerance errors and simplifies layout - unlike the adjustable LM2672 version, which requires two external resistors to set VOUT.

How does the SYNC pin function on LM2672N-12/NOPB?

The SYNC pin on LM2672N-12/NOPB accepts an external TTL/CMOS clock signal (>275 kHz) to override the internal 260-kHz oscillator. When driven, it synchronizes switching edges to reduce beat frequencies and enable coordinated EMI filtering across multiple rails. AC-coupling via a 100-pF capacitor and 1-kΩ pull-down is recommended; note that current-limit frequency foldback is disabled during SYNC operation.

What thermal considerations apply to LM2672N-12/NOPB in SOIC-8 package?

LM2672N-12/NOPB in SOIC-8 has R_θJA = 105°C/W on a standard 4-layer JEDEC board. At 1-A load and 24-V input, dissipation is ~0.3 W - resulting in ~32°C rise above ambient. The datasheet confirms PCB copper traces alone suffice as heatsink; no thermal pad or external heatsink is required. Ensure GND pins (Pin 6) have low-impedance connections and avoid enclosing the IC in thermally restrictive enclosures above 85°C ambient.

Can LM2672N-12/NOPB be used in automotive applications?

Yes, LM2672N-12/NOPB supports automotive use cases with its 8–40 V input range covering cold-crank (≥6.5 V) and load-dump (≤40 V) conditions, –40°C to 125°C operating junction temperature, and built-in thermal shutdown. It is commonly deployed in aftermarket modules like dashcams and telematics units. However, it is not AEC-Q200 qualified - for safety-critical or OEM-tier applications, consult TI's automotive-grade alternatives such as the LM61480-Q1.