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Texas Instruments LM2672MX-ADJ/NOPB
- Part No.:
- LM2672MX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2672MX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,268
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Product details
Overview
LM2672MX-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, and ±1.5% output voltage tolerance over line and load. It integrates a DMOS power MOSFET switch, internal frequency compensation, soft-start, and thermal/current protection-designed for high-efficiency (>90%) point-of-load conversion in industrial power supplies.
For engineers reviewing the LM2672MX-ADJ/NOPB datasheet, LM2672MX-ADJ/NOPB pinout, LM2672MX-ADJ/NOPB application, or LM2672MX-ADJ/NOPB equivalent, key selection criteria include input voltage range (8 V–40 V), feedback reference voltage (1.21 V), ON/OFF control interface, SYNC capability for external clock synchronization, and SOIC-8 package compatibility with standard PCB layout practices.
Technical Context
The LM2672MX-ADJ/NOPB implements a fixed-frequency PWM controller with an internal 260-kHz oscillator driving a high-side DMOS FET switch. Its feedback loop uses a precision 1.21-V reference and low-bias-current amplifier (85 nA) to regulate output via external resistor divider on the FB pin.
Functional modes include active regulation (ON/OFF ≥1.4 V), TTL-compatible shutdown (ON/OFF ≤0.8 V, 50 μA standby), and optional frequency synchronization (SYNC pin accepts 400-kHz max external clock). Protection includes cycle-by-cycle current limiting (1.25–2.1 A), thermal shutdown, and soft-start via external capacitor on SS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A continuous - supports mid-power loads without external heatsinking due to high efficiency and copper-trace thermal dissipation. |
| Input Voltage Range | 8 V to 40 V - enables direct use with 12-V/24-V industrial rails and battery-backed systems. |
| Output Voltage Range | 1.21 V to 37 V - set by external resistor divider on FB pin; 1.21-V reference enables precise low-voltage regulation. |
| Switching Frequency | 260 kHz (±10%) - allows compact LC filter design while avoiding audible noise and EMI-sensitive bands. |
| Feedback Reference | 1.21 V ±1.5% - defines output accuracy; bias current <85 nA minimizes divider error and improves light-load stability. |
| Quiescent Current | 3.6 mA typical - ensures low no-load power loss in always-on systems. |
| Standby Current | 50 μA typical - enables ultra-low-power shutdown for battery-critical applications. |
Pinout & Package
LM2672MX-ADJ/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 Rev L datasheet Figure 3 (SOIC top view).
| 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; critical for RDS(on) minimization and efficiency. |
| 2 (SS) | Soft-start timing input | External capacitor to GND sets output voltage ramp time; floating disables soft-start. |
| 3 (SYNC) | Frequency synchronization input | Accepts external TTL/CMOS clock up to 400 kHz; overrides internal 260-kHz oscillator for EMI control or system clock alignment. |
| 4 (FB) | Feedback sense input | High-impedance input referenced to 1.21 V; connects to resistor divider midpoint to program output voltage in adjustable version. |
| 5 (ON/OFF) | Enable/disable control | TTL-compatible logic input: ≥1.4 V = ON, ≤0.8 V = OFF; internal 20-μA pull-up allows open-circuit enable. |
| 6 (GND) | Power ground | Main return path for input/output capacitors and inductor; shortest possible trace required for stability and EMI reduction. |
| 7 (VIN) | Input supply | Connects to 8–40 V source and high-frequency input capacitor (CIN); low-inductance path essential for switch-node integrity. |
| 8 (VSW) | Switch node output | Drives external inductor and Schottky catch diode; swings between VIN and ~−0.5 V; requires tight layout to minimize ringing and EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | RDS(on) = 0.3 Ω max at 25°C - reduces conduction loss and eliminates need for external high-side driver or discrete MOSFET. |
| Internal frequency compensation | Patented compensation - eliminates external compensation network; simplifies design and improves transient response across operating conditions. |
| Thermal + current limit protection | Auto-recovering shutdown - prevents damage during overload or short-circuit without requiring manual reset or external circuitry. |
| Soft-start with external capacitor | Programmable ramp rate - avoids inrush current into output capacitors and prevents input rail sag during startup. |
| SYNC pin for external clocking | Enables deterministic ripple frequency - supports synchronized switching in multi-rail systems and precise EMI filtering. |
Applications
| Industrial Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Converting 24-V vehicle battery to 5-V/3.3-V for microcontrollers and sensors in door modules or lighting controllers. IC Role / Device Role / Timing Role: Primary buck regulator providing stable, efficient, and fault-protected intermediate rail. Use Value: 90%+ efficiency minimizes heat buildup in sealed enclosures; 8–40 V input range accommodates cold-crank (6.5 V) and load-dump (40 V) transients. | Use Scenario: Generating 3.3-V logic supply from 12-V battery in engine control units with strict EMI requirements. IC Role / Device Role / Timing Role: Synchronized buck converter locked to system clock to avoid beat frequencies in CAN/LIN communication bands. Use Value: SYNC pin enables fixed 260-kHz or externally aligned switching frequency, enabling predictable EMI filtering and compliance with automotive CISPR-25 Class 5 limits. |
| Point-of-Load Converter | Field-Programmable Gate Array (FPGA) Auxiliary Rail |
Use Scenario: Providing 1.8-V or 2.5-V supply to ASICs or DSPs on industrial PLC backplanes with limited board space. IC Role / Device Role / Timing Role: Adjustable-output buck regulator delivering tightly regulated voltage with minimal external components. Use Value: 1.21-V reference and low FB bias current (<85 nA) ensure ±1.5% output accuracy even with high-resistance feedback dividers, reducing component count and layout sensitivity. | Use Scenario: Supplying configurable I/O bank voltage (e.g., 1.5 V, 1.8 V, 2.5 V) to Xilinx or Intel FPGA banks during prototyping and field upgrades. IC Role / Device Role / Timing Role: Programmable buck regulator supporting rapid voltage reconfiguration via resistor change without PCB redesign. Use Value: Adjustable output range (1.21–37 V) and SOIC-8 footprint allow single BOM variant to serve multiple FPGA voltage requirements, lowering inventory and qualification overhead. |
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, but higher RDS(on) (0.4 Ω) and quiescent current (5.5 mA). | Higher current capability suits larger loads; less suitable for low-quiescent or space-constrained designs. | Select when >1-A output is required and board layout allows same SOIC-8 footprint. |
| TPS54202DRCT | 2-A synchronous buck, 4.5–28 V input, integrated high/low-side FETs, 500-kHz switching, smaller 10-pin WSON package. | No external diode needed; higher frequency enables smaller magnetics; lacks SYNC and soft-start capacitor option. | Prefer for compact, high-density designs where synchronous rectification and reduced BOM outweigh loss of SYNC/soft-start flexibility. |
Compared with LM2672MX-ADJ/NOPB, LM2671MX-ADJ/NOPB delivers higher current but trades off efficiency and quiescent performance, while TPS54202DRCT offers integration and size advantages at the cost of configurability and legacy compatibility.
Availability
LM2672MX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, point-of-load converters, and FPGA auxiliary rails requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2672MX-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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with broad industrial, automotive, and communications reach.
The LM2672MX-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family-designed specifically for ease-of-use, minimal external component count, and robust operation in demanding DC-DC conversion applications without requiring expert power design knowledge.
FAQ
What is the minimum input voltage required for stable operation of the LM2672MX-ADJ/NOPB?
The LM2672MX-ADJ/NOPB specifies a recommended minimum input voltage of 6.5 V across its operating temperature range (–40°C to 125°C). Below this, regulation may be lost or current limiting may activate prematurely. At room temperature, stable operation begins at 6.5 V, but full 1-A output capability requires ≥8 V per the datasheet's electrical characteristics table for the adjustable version.
Can the LM2672MX-ADJ/NOPB be synchronized to an external clock, and what are the voltage requirements?
Yes, the LM2672MX-ADJ/NOPB supports external clock synchronization via its SYNC pin. The external signal must be TTL- or CMOS-compatible (0 V to >3 V), AC-coupled through a 100-pF capacitor and 1-kΩ resistor to ground, and operate between 260 kHz and 400 kHz. Exceeding 400 kHz risks improper oscillator reset; below 260 kHz may cause instability or foldback behavior.
What is the purpose of the CB pin on the LM2672MX-ADJ/NOPB, and what capacitor value is recommended?
CB is the bootstrap capacitor terminal for the high-side MOSFET gate driver. It must be connected to the VSW pin using a 0.01-μF (10 nF), 50-V ceramic capacitor to generate sufficient gate voltage above VIN for full enhancement of the internal DMOS switch. Omitting or undersizing this capacitor causes excessive RDS(on), reduced efficiency, and potential thermal failure under load.
How does the ON/OFF pin function on the LM2672MX-ADJ/NOPB, and what happens in shutdown mode?
The ON/OFF pin enables or disables the LM2672MX-ADJ/NOPB: voltage ≥1.4 V enables regulation; ≤0.8 V forces shutdown. In shutdown, the device draws only 50 μA typical (150 μA max over temperature), halts switching, and disconnects the internal power switch. The pin features an internal 20-μA pull-up, so leaving it unconnected defaults to enabled operation.
What is the maximum output voltage achievable with the LM2672MX-ADJ/NOPB, and how is it set?
The LM2672MX-ADJ/NOPB supports an output voltage range of 1.21 V to 37 V, set by an external resistor divider connected between VOUT, FB, and GND. The FB pin references a precise 1.21-V internal bandgap, so VOUT = 1.21 V × (1 + R1/R2). For example, using R2 = 10 kΩ and R1 = 29.2 kΩ yields 5.0 V. Maximum output is limited by external component voltage ratings and internal switch breakdown (45 V absolute max).
LM2672MX-ADJ/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:
- 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:
- 8-SOIC
LM2672MX-ADJ/NOPB FAQ
1.How can I place an order for LM2672MX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2672MX-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 LM2672MX-ADJ/NOPB reliable?
The price and inventory of LM2672MX-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 LM2672MX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2672MX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2672MX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2672MX-ADJ/NOPB?
LM2672MX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2672MX-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 LM2672MX-ADJ/NOPB?
For technical support, including LM2672MX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2672MX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2672MX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2672MX-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 LM2672MX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2672MX-ADJ/NOPB?
All LM2672MX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2672MX-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 LM2672MX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2672MX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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