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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Texas Instruments LM2672LD-ADJ/NOPB

Name: LM2672LD-ADJ/NOPB
Brand: Texas Instruments
SKU: LM2672LD-ADJ/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM2672LD-ADJ/NOPB

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 16-WFDFN Exposed Pad

Datasheet:: LM2672LD-ADJ/NOPB.pdf

Description:: IC REG BUCK ADJ 1A 16WSON

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Product details

Overview

LM2672LD-ADJ/NOPB from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator IC with adjustable output voltage (1.21 V to 37 V), 1-A continuous output current capability, 260-kHz fixed-frequency operation, ±1.5% output voltage tolerance over line and load, and wide 8 V to 40 V input range - used in industrial power supplies, battery-powered equipment, and distributed power architectures.

For engineers reviewing the LM2672LD-ADJ/NOPB datasheet, LM2672LD-ADJ/NOPB pinout, LM2672LD-ADJ/NOPB application, or LM2672LD-ADJ/NOPB equivalent, key selection criteria include feedback voltage accuracy (1.21 V ±1.5%), soft-start control via external capacitor, TTL-compatible ON/OFF shutdown (50 μA standby), thermal/overcurrent protection, and SOIC-8 package compatibility with standard PCB layouts.

Technical Context

The LM2672LD-ADJ/NOPB integrates a DMOS high-side power MOSFET switch, internal 260-kHz oscillator, PWM controller, soft-start circuit, and feedback amplifier. Its adjustable output is set by an external resistor divider connected to the FB pin, referenced to a precise 1.21-V internal bandgap.

It operates in continuous conduction mode (CCM) across its rated 1-A load, employs frequency synchronization (SYNC pin accepts 400-kHz external clock), and features cycle-by-cycle current limiting with thermal shutdown - all implemented without requiring external compensation components due to patented internal frequency compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	1 A continuous - supports single-rail loads such as microcontrollers, FPGAs, and analog subsystems without external current boosting.
Input Voltage Range	8 V to 40 V - enables direct use with 12-V, 24-V, and 36-V industrial or automotive battery systems.
Feedback Voltage	1.21 V ±1.5% - sets output via resistor divider; enables stable 1.21–37 V adjustment with minimal drift over temperature.
Switching Frequency	260 kHz (±10%) - allows compact LC filter design (e.g., 47–68 µH inductor + 47–68 µF output cap) while avoiding AM radio band interference.
Efficiency	Up to 96% - reduces thermal load on PCB; copper traces alone suffice for heat sinking under full 1-A load.
Standby Current	50 µA typical - enables low-power sleep modes in portable or always-on embedded systems.
Thermal Protection	Internal thermal shutdown - disables switching above 150°C junction temperature, preventing permanent damage during overload or poor airflow.

Pinout & Package

LM2672LD-ADJ/NOPB is housed in an 8-pin SOIC package (5.00 mm × 6.20 mm body size) with exposed pad not present - compatible with standard reflow profiles and automated assembly.

Pin/Terminal	Circuit Role	Design Meaning
1 (CB)	Bootstrap capacitor connection	Connects 0.01-µF ceramic capacitor to VSW to gate-drive high-side MOSFET fully ON, minimizing R_DS(on) losses.
2 (SS)	Soft-start timing input	Controls output ramp rate via external capacitor to GND; prevents inrush current and stabilizes startup.
3 (SYNC)	Frequency synchronization input	Accepts external TTL/CMOS clock >275 kHz to lock switching frequency - critical for EMI-sensitive comms systems.
4 (FB)	Feedback sense input	Monitors output via resistor divider; internal 1.21-V reference enables precise adjustable regulation without external reference.
5 (ON/OFF)	Enable/disable control	TTL-compatible logic input: <1.4 V = shutdown (50 µA I_Q); >1.4 V = active; internal 20-µA pull-up simplifies interface.
6 (GND)	Power ground	Main return path for input/output capacitors and inductor; must be short, low-impedance trace to minimize noise and instability.
7 (VIN)	Input supply	Accepts 8–40 V unregulated DC; requires local 22-µF tantalum bypass capacitor placed adjacent to pin.
8 (VSW)	Switch node output	Drives external inductor and Schottky catch diode; swings from VIN to ~−0.5 V; layout must minimize loop area for EMI control.

Key Features

Feature	Design Value
Integrated high-side DMOS switch	R_DS(on) = 0.3 Ω max at 25°C - eliminates need for external MOSFET and driver, reducing BOM count and layout complexity.
Patented internal frequency compensation	Enables stable operation with only 5 external components (inductor, diode, input/output caps, FB divider) - no external compensation network required.
Fixed 260-kHz oscillator	Provides consistent ripple frequency and predictable filter sizing - avoids subharmonic oscillation and simplifies EMI filtering vs. variable-frequency controllers.
TTL shutdown with 50-µA standby	Allows system-level power sequencing and ultra-low-power sleep states without external enable circuitry or leakage concerns.
Thermal shutdown + current limit	Combines cycle-by-cycle peak current limiting (1.25–2.1 A) and junction-temperature cutoff (150°C) - protects against short-circuit, overload, and thermal runaway.

Applications

Industrial Power Supply	Automotive Body Control Module
Use Scenario: Converting 24-V vehicle battery to 5-V/3.3-V rails for microcontroller, CAN transceiver, and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated DC power with thermal robustness for under-hood environments. Use Value: 8–40 V input range accommodates cold-crank (6.5 V min) and load-dump (40 V max) transients per ISO 7637-2; 96% efficiency minimizes heat buildup in sealed enclosures.	Use Scenario: Generating 3.3-V logic supply from 12-V battery for infotainment head unit processors and memory. IC Role / Device Role / Timing Role: Adjustable-output step-down converter enabling flexible rail generation without redesigning PCB for different voltage variants. Use Value: 1.21-V feedback reference and ±1.5% tolerance ensure stable core voltage under varying load and temperature - critical for DDR memory timing compliance.
Portable Test Equipment	Distributed Telecom Power
Use Scenario: Powering mixed-signal data acquisition circuits (ADCs, op-amps, microcontrollers) from Li-ion or 12-V adapter input. IC Role / Device Role / Timing Role: High-efficiency intermediate regulator delivering clean, low-noise 3.3-V or 5-V supply with soft-start to prevent measurement disturbance. Use Value: Soft-start (SS pin) controls output ramp time to avoid transient-induced glitches in sensitive analog front-ends during power-up.	Use Scenario: Local point-of-load conversion of 48-V telecom bus to 12-V or 5-V for remote radio units or optical modules. IC Role / Device Role / Timing Role: Robust buck converter handling wide input variation and high ambient temperatures in outdoor cabinets. Use Value: Thermal shutdown and current limit protect against sustained overloads in fanless deployments; 260-kHz switching enables small, standardized magnetics across product lines.

Industrial Power Supply

Automotive Body Control Module

Use Scenario: Converting 24-V vehicle battery to 5-V/3.3-V rails for microcontroller, CAN transceiver, and sensor interfaces.

IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated DC power with thermal robustness for under-hood environments.

Use Value: 8–40 V input range accommodates cold-crank (6.5 V min) and load-dump (40 V max) transients per ISO 7637-2; 96% efficiency minimizes heat buildup in sealed enclosures.

Use Scenario: Generating 3.3-V logic supply from 12-V battery for infotainment head unit processors and memory.

IC Role / Device Role / Timing Role: Adjustable-output step-down converter enabling flexible rail generation without redesigning PCB for different voltage variants.

Use Value: 1.21-V feedback reference and ±1.5% tolerance ensure stable core voltage under varying load and temperature - critical for DDR memory timing compliance.

Portable Test Equipment

Distributed Telecom Power

Use Scenario: Powering mixed-signal data acquisition circuits (ADCs, op-amps, microcontrollers) from Li-ion or 12-V adapter input.

IC Role / Device Role / Timing Role: High-efficiency intermediate regulator delivering clean, low-noise 3.3-V or 5-V supply with soft-start to prevent measurement disturbance.

Use Value: Soft-start (SS pin) controls output ramp time to avoid transient-induced glitches in sensitive analog front-ends during power-up.

Use Scenario: Local point-of-load conversion of 48-V telecom bus to 12-V or 5-V for remote radio units or optical modules.

IC Role / Device Role / Timing Role: Robust buck converter handling wide input variation and high ambient temperatures in outdoor cabinets.

Use Value: Thermal shutdown and current limit protect against sustained overloads in fanless deployments; 260-kHz switching enables small, standardized magnetics across product lines.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM2671MX-ADJ/NOPB	3-A output current, same 260-kHz frequency and pinout family, but larger SO-8 package with different thermal pad configuration.	Higher current capability suits 3-A loads; not drop-in due to different thermal pad layout and higher quiescent current (5 mA vs. 3.6 mA).	Select when >1-A output is needed and board layout allows SO-8 variant with enhanced thermal pad.
TPS54202DDCR	2-A synchronous buck, 4.5–28-V input, 500-kHz switching, integrated high/low-side FETs, smaller SOT-23-6 package.	Lacks SYNC and SS pins; no bootstrap requirement; lower voltage range limits use in 36–40-V industrial apps.	Prefer for space-constrained designs with ≤28-V input and where synchronous rectification improves light-load efficiency.

Compared with LM2671MX-ADJ/NOPB, LM2672LD-ADJ/NOPB offers lower quiescent current and simpler thermal layout but half the output current; versus TPS54202DDCR, it supports higher input voltage and provides dedicated SYNC/SS control - making it preferable for ruggedized 24/36-V systems needing precise frequency control and soft-start.

Availability

LM2672LD-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, portable instrumentation, and distributed telecom power systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LM2672LD-ADJ/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 leadership in high-reliability industrial and automotive power solutions.

The LM2672 series belongs to TI's SIMPLE SWITCHER® power converter family - designed specifically for ease-of-use, minimal external component count, and robust performance in cost-sensitive, thermally constrained DC-DC applications.

FAQ

What is the minimum input voltage required for stable operation of the LM2672LD-ADJ/NOPB?

The LM2672LD-ADJ/NOPB specifies a recommended minimum input voltage of 6.5 V across operating temperature, though functional operation begins at 8 V per absolute ratings. For reliable regulation with 1-A load and adjustable output ≥5 V, maintain VIN ≥ (VOUT / 0.95) + 1.5 V to ensure sufficient duty cycle margin - e.g., 12 V output requires ≥13.2 V minimum input at full load. The LM2672LD-ADJ/NOPB datasheet defines 6.5 V as the lower bound of recommended operating conditions.

Can the LM2672LD-ADJ/NOPB synchronize to an external clock, and what are the constraints?

Yes, the LM2672LD-ADJ/NOPB supports external frequency synchronization via the SYNC pin. The external clock must exceed 275 kHz (the maximum internal oscillator frequency) to prevent erroneous reset of the internal ramp oscillator. TI recommends AC-coupling a TTL/CMOS signal (0–>3 V) through a 100-pF capacitor and 1-kΩ resistor to ground. When SYNC is active, current-limit frequency foldback is disabled - so short-circuit protection relies solely on cycle-by-cycle current limiting. This behavior is documented in the LM2672LD-ADJ/NOPB datasheet Section 9.3.3.

How does the soft-start function work on the LM2672LD-ADJ/NOPB, and what capacitor value is recommended?

The LM2672LD-ADJ/NOPB implements soft-start by charging an external capacitor connected between the SS pin and GND. The internal 4.5-µA current source ramps the SS voltage linearly, delaying full PWM duty cycle until the SS pin reaches ~0.63 V. A typical 10-nF capacitor yields ~2.2-ms ramp time. Larger values extend ramp time proportionally - e.g., 100 nF gives ~22 ms. Leaving SS open disables soft-start. This feature prevents inrush current and output overshoot during startup, and is confirmed in LM2672LD-ADJ/NOPB Electrical Characteristics Table 7.9 (VSS, ISS parameters).

What is the purpose of the CB pin on the LM2672LD-ADJ/NOPB, and what capacitor should be used?

The CB (bootstrap capacitor) pin on the LM2672LD-ADJ/NOPB provides gate drive voltage boost for the internal high-side DMOS switch. A 0.01-µF (10 nF) ceramic capacitor must be connected between CB and VSW to generate ~V_IN + 10 V gate voltage, ensuring full enhancement of the MOSFET and minimizing conduction losses. This capacitor charges during the low phase of the switching cycle and discharges into the gate during turn-on. Using a low-ESR, X7R or C0G dielectric capacitor placed close to the CB/VSW pins is critical for stable operation - as specified in LM2672LD-ADJ/NOPB Section 9.3.2 and Figure 19.

Does the LM2672LD-ADJ/NOPB require external compensation components, and why?

No, the LM2672LD-ADJ/NOPB does not require external compensation components due to its patented internal frequency compensation architecture. This design ensures stability across the full 1-A load range and input voltage span using only five external components: input capacitor, output capacitor, inductor, Schottky catch diode, and FB resistor divider. The internal compensation eliminates phase-margin tuning effort and reduces design risk - a defining feature of the SIMPLE SWITCHER® family confirmed in LM2672LD-ADJ/NOPB Sections 3 and 9.3.4.

LM2672LD-ADJ/NOPB Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: SIMPLE SWITCHER®

Package/Case:: 16-WFDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 6.5V

Voltage - Input (Max):: 40V

Voltage - Output (Min/Fixed):: 1.21V

Voltage - Output (Max):: 37V

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-ADJ/NOPB FAQ

1.How can I place an order for LM2672LD-ADJ/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LM2672LD-ADJ/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-ADJ/NOPB reliable?

The price and inventory of LM2672LD-ADJ/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-ADJ/NOPB is usually 5 days.

3.What payment methods are accepted for LM2672LD-ADJ/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2672LD-ADJ/NOPB transactions.

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LM2672LD-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM2672LD-ADJ/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-ADJ/NOPB?

For technical support, including LM2672LD-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2672LD-ADJ/NOPB requirements.

6.How does Aetrix verify that LM2672LD-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?

All LM2672LD-ADJ/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-ADJ/NOPB meets industry standards.

7.What is the process for return or replacement of LM2672LD-ADJ/NOPB?

All LM2672LD-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2672LD-ADJ/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-ADJ/NOPB part is unused and in its original packaging.

Return procedure for LM2672LD-ADJ/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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