Texas Instruments LM2672LD-5.0/NOPB

Overview

LM2672LD-5.0/NOPB from Texas Instruments (formerly National Semiconductor) is a monolithic 1A step-down DC-DC switching regulator in LLP-16 package, delivering fixed 5.0V output with ±1.5% tolerance over line/load, 260 kHz fixed-frequency operation, and 90% efficiency at 12V input/1A load. It integrates a 0.25Ω DMOS power switch, soft-start, frequency synchronization, and thermal/current protection for industrial power rails.

For engineers reviewing the LM2672LD-5.0/NOPB datasheet, LM2672LD-5.0/NOPB pinout, LM2672LD-5.0/NOPB application, or LM2672LD-5.0/NOPB equivalent, key selection criteria include input voltage range (6.5–40V), guaranteed 1A output current, standby current (50 μA), oscillator frequency tolerance (±10%), and compatibility with standard off-the-shelf inductors and Schottky catch diodes.

Technical Context

The LM2672LD-5.0/NOPB implements a synchronous-buck topology using an internal DMOS switch and patented frequency compensation (U.S. Pat. Nos. 5,382,918 & 5,514,947). Its 260 kHz fixed-frequency oscillator enables predictable EMI filtering and supports external synchronization up to 400 kHz via the SYNC pin.

Control architecture includes TTL-compatible ON/OFF shutdown (1.4V threshold), soft-start (0.63V threshold, 4.5 μA current), and feedback regulation referenced to 1.21V internal bandgap. Protection features comprise cycle-by-cycle current limiting (1.55A typical), thermal shutdown, and output short-circuit robustness.

Key Specifications

Pinout & Package

LM2672LD-5.0/NOPB uses the 16-pin LLP (Leadless Leadframe Package) with exposed thermal pad, optimized for high-power density and thermal performance on multilayer PCBs with thermal vias. Package drawing LDA16A defines mechanical dimensions and solder mask layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM2672M-5.0, the LM2672LD-5.0/NOPB offers superior thermal performance in space-constrained layouts; versus LM2596S-5.0, it delivers faster transient response, tighter output tolerance, and synchronization capability - critical for multi-rail test and telecom systems.

Availability

LM2672LD-5.0/NOPB is available at Aetrix Electronics and suitable for industrial PLC power supplies, automotive body control modules, point-of-load telecom converters, and test equipment power subsystems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LM2672LD-5.0/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 maintains full technical and manufacturing continuity for the SIMPLE SWITCHER® portfolio. TI is a global semiconductor leader focused on analog and embedded processing solutions.

The LM2672 series belongs to TI's SIMPLE SWITCHER® power converter family, designed specifically for ease-of-use in cost-sensitive, high-reliability DC-DC conversion applications where minimal external components and proven reference designs accelerate time-to-market.

FAQ

What is the maximum input voltage rating for the LM2672LD-5.0/NOPB?

The absolute maximum input voltage for the LM2672LD-5.0/NOPB is 45V, but the recommended operating range is 6.5V to 40V DC. Exceeding 40V may compromise long-term reliability and is outside guaranteed specifications. The device sustains brief load-dump transients common in automotive 24V systems due to its 40V operational ceiling and internal clamp structures.

Does the LM2672LD-5.0/NOPB require an external feedback resistor network?

No, the LM2672LD-5.0/NOPB does not require an external feedback resistor network. As a fixed-output variant, its feedback node (FB) is internally connected to the 5.0V regulation reference. External resistors are only needed for the adjustable version (LM2672LD-ADJ); adding them to LM2672LD-5.0/NOPB would disrupt regulation and is not supported.

Can the LM2672LD-5.0/NOPB be synchronized to an external clock?

Yes, the LM2672LD-5.0/NOPB supports external frequency synchronization via the SYNC pin (Pin 3). Applying a 400 kHz square wave with ≥3V peak-to-peak amplitude synchronizes the internal 260 kHz oscillator, enabling noise reduction in multi-regulator systems and allowing inductor/capacitor downsizing when operated above nominal frequency.

What thermal considerations apply to the LM2672LD-5.0/NOPB in LLP package?

The LM2672LD-5.0/NOPB in LLP-16 relies on PCB copper area and thermal vias under the exposed pad for heat dissipation. TI Application Note AN-1187 specifies layout guidelines: ≥1 in² of 2-oz copper with ≥4 thermal vias (0.3 mm diameter) reduces θ_JA significantly. Without proper layout, junction temperature can exceed 125°C at full 1A load in still air.

Is the LM2672LD-5.0/NOPB RoHS compliant and lead-free?

Yes, the LM2672LD-5.0/NOPB is RoHS compliant and lead-free. The "/NOPB" suffix explicitly denotes "No Lead (Pb)-Free" per TI's packaging nomenclature. It meets JEDEC J-STD-020 moisture sensitivity level 3 and is compatible with standard Pb-free reflow profiles (peak 260°C).