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Texas Instruments LM2672MX-ADJ
- Part No.:
- LM2672MX-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2672MX-ADJ.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,861
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Product details
Overview
LM2672MX-ADJ from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator IC with integrated DMOS power MOSFET, delivering up to 1 A output current, 260 kHz fixed switching frequency, ±1.5% output voltage tolerance, and adjustable output range of 1.21 V to 37 V. It operates from 8 V to 40 V input and enables high-efficiency (>90%) power conversion in industrial and embedded power supplies.
For engineers reviewing the LM2672MX-ADJ datasheet, LM2672MX-ADJ pinout, LM2672MX-ADJ application, or LM2672MX-ADJ equivalent, key selection criteria include feedback voltage accuracy (1.21 V), soft-start control capability, TTL-compatible ON/OFF shutdown, thermal/overcurrent protection, and SOIC-8 package compatibility with standard PCB layouts.
Technical Context
The LM2672MX-ADJ implements a fixed-frequency PWM controller with internal 260 kHz oscillator, synchronous rectification support via external Schottky diode, and bootstrapped high-side gate drive using the CB–VSW node. Its feedback loop senses output voltage via resistive divider at FB pin and regulates against a precise 1.21 V reference.
Functional modes include active regulation (ON/OFF ≥1.4 V), low-power standby (ON/OFF <1.4 V, 50 μA IQ), and fault protection via cycle-by-cycle current limiting (1.25–2.1 A), thermal shutdown, and frequency foldback under short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A continuous - supports single-rail loads such as microcontrollers, FPGAs, and analog circuitry without external current boosting. |
| Input Voltage Range | 8 V to 40 V - accommodates wide-input industrial and automotive battery-derived supplies with margin for transients. |
| Output Voltage Range | 1.21 V to 37 V - set by external resistor divider on FB pin; enables flexible rail generation across logic, analog, and interface domains. |
| Feedback Reference | 1.21 V ±1.5% - defines regulation accuracy baseline; determines output precision when using standard 1% resistors. |
| Switching Frequency | 260 kHz (±10%) - enables use of compact 47–68 μH inductors and reduces EMI compared to lower-frequency buck converters. |
| Quiescent Current | 3.6 mA typical - ensures low no-load power draw in always-on subsystems; drops to 50 μA in shutdown mode. |
| Current Limit | 1.25 A min / 2.1 A max - provides overcurrent protection during startup, short-circuit, or overload; triggers frequency foldback below 100 kHz under extreme faults. |
Pinout & Package
LM2672MX-ADJ is packaged in an 8-pin SOIC (5.00 mm × 6.20 mm) with exposed pad not specified. Pin functions are validated per TI SNVS136L datasheet Rev L (June 2016).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CB) | Bootstrap capacitor connection | Connects 0.01 μF ceramic capacitor to VSW to elevate gate drive above VIN for full enhancement of internal DMOS switch. |
| 2 (SS) | Soft-start timing input | Accepts capacitor to GND to linearly ramp output voltage at startup; prevents inrush current and overshoot. |
| 3 (SYNC) | External clock synchronization input | Allows forced switching frequency >260 kHz for EMI control or system-level clock alignment; disables frequency foldback when active. |
| 4 (FB) | Feedback sense input | High-impedance (85 nA bias) input referenced to 1.21 V; connects to resistor divider midpoint to set output voltage. |
| 5 (ON/OFF) | Enable/disable control | TTL-compatible digital input; ≥1.4 V enables regulation, <1.4 V shuts down IC with 50 μA standby current. |
| 6 (GND) | Power ground | Main return path for input/output capacitors and inductor; requires short, low-inductance trace to minimize noise and improve stability. |
| 7 (VIN) | Main power input | Accepts 8–40 V supply; connects to high-frequency bypass capacitor (22 μF tantalum) with minimal loop area to GND. |
| 8 (VSW) | Switch node output | Drives external inductor and Schottky catch diode; swings between VIN and ~−0.5 V; critical for layout EMI and efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | Eliminates need for external high-side MOSFET; RDS(ON) = 0.3 Ω typ at 25°C enables >90% efficiency at 1 A load. |
| Patented internal frequency compensation | Removes requirement for external compensation network; simplifies design and improves stability across operating conditions. |
| Soft-start with external capacitor control | Prevents output voltage overshoot and limits inrush current into bulk output capacitance during power-up. |
| TTL-compatible shutdown with 50 μA standby | Enables low-power system sleep modes while maintaining fast wake-up response (<100 μs) without external level-shifting. |
| Thermal shutdown + cycle-by-cycle current limit | Provides dual-layer protection: immediate current cutoff at 1.25 A+ and thermal cutoff at TJ >150°C for robust field reliability. |
Applications
| Industrial Power Supply | Embedded System Rail Generator |
|---|---|
Use Scenario: Converting 24 V factory bus to 3.3 V or 5 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator providing stable, efficient, and protected DC rail for digital and analog subsystems. Use Value: Delivers 1 A at >90% efficiency with no heatsink required; thermal shutdown prevents damage during ambient temperature excursions. | Use Scenario: Generating configurable core voltage for FPGA or ARM-based edge controllers from wide-range 12–36 V input. IC Role / Device Role / Timing Role: Adjustable-output buck converter enabling dynamic voltage scaling and multi-voltage board architecture. Use Value: 1.21 V reference and ±1.5% tolerance ensure accurate rail setting across temperature; SYNC pin allows EMI synchronization with system clock. |
| Automotive Subsystem Power | Test Equipment Power Module |
Use Scenario: Regulating 12 V vehicle battery (8–16 V nominal, up to 40 V load dump) to 5 V for infotainment USB ports. IC Role / Device Role / Timing Role: Input-transient-tolerant buck regulator with shutdown control for ignition-synchronized power sequencing. Use Value: 40 V absolute max input rating and 50 μA shutdown current meet automotive cold-crank and quiescent current requirements. | Use Scenario: Providing clean, adjustable DC output in benchtop power analyzers requiring stable 1.8–15 V rails at ≤1 A. IC Role / Device Role / Timing Role: Precision-adjustable voltage source with soft-start and remote enable for programmable instrument front-end supplies. Use Value: 1.21 V FB reference and tight line/load regulation (±1.5%) ensure measurement-grade output accuracy and repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2596T-ADJ | 3 A output current, 150 kHz switching frequency, wider input range (4.5–40 V), but larger minimum external component count and no SYNC pin. | Better suited for higher-current, cost-sensitive designs where EMI synchronization is unnecessary and board space allows larger inductors. | Select LM2596T-ADJ when >1 A load or lower BOM cost is prioritized over 260 kHz EMI profile and soft-start flexibility. |
| TPS54302DDCR | 3 A output, 2.5–6 V input, integrated high/low-side MOSFETs, 2.5 MHz switching, no external diode required, but narrower input range and no adjustable FB reference beyond 0.6 V. | Ideal for low-input, high-density point-of-load applications; lacks wide-input capability and direct 1.21 V reference for legacy feedback networks. | Choose TPS54302DDCR for compact 3.3/5 V rails from 5 V or 12 V sources where footprint and efficiency at light load matter most. |
Compared with LM2596T-ADJ and TPS54302DDCR, the LM2672MX-ADJ uniquely balances 1 A capability, 8–40 V input, 1.21 V reference, and 260 kHz fixed-frequency operation-making it optimal for industrial and automotive buck regulators requiring proven reliability, minimal external parts, and straightforward layout.
Availability
LM2672MX-ADJ is available at Aetrix Electronics and suitable for industrial automation, embedded computing, and automotive subsystems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for LM2672MX-ADJ 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 switching regulator innovation.
The LM2672MX-ADJ belongs to TI's SIMPLE SWITCHER® family-designed specifically for ease-of-use, minimal external component count, and robust operation in harsh industrial and automotive environments.
FAQ
What is the maximum output voltage achievable with LM2672MX-ADJ?
The LM2672MX-ADJ supports an adjustable output voltage range from 1.21 V to 37 V, determined by the external resistor divider connected to the FB pin. This upper limit is constrained by the 40 V absolute maximum input rating and internal circuitry headroom, making it suitable for generating intermediate rails like 15 V or 24 V from higher input sources without requiring cascaded regulation stages. The LM2672MX-ADJ maintains ±1.5% regulation accuracy across this full range under specified line and load conditions.
Does LM2672MX-ADJ require an external Schottky diode?
Yes, the LM2672MX-ADJ requires an external Schottky diode (e.g., IR 30WQ05F) connected between the VSW pin and output capacitor. Unlike synchronous buck controllers, it uses an internal DMOS high-side switch paired with an external low-VF diode for the low-side path. This architecture simplifies thermal design and avoids shoot-through risk, though it trades ~2–3% efficiency versus fully synchronous alternatives. The LM2672MX-ADJ datasheet specifies 3.3-A, 50-V Schottky diodes for reliable 1-A operation.
How does the SYNC pin affect LM2672MX-ADJ operation?
The SYNC pin on the LM2672MX-ADJ allows external TTL/CMOS clock signals (>260 kHz) to override the internal 260 kHz oscillator, enabling precise EMI frequency positioning and system-level clock synchronization. When active, SYNC disables frequency foldback protection during overloads, so designers must verify short-circuit behavior in synchronized mode. The LM2672MX-ADJ requires AC coupling (100 pF + 1 kΩ to GND) for robust noise immunity, and the external clock must exceed 275 kHz to prevent oscillator reset anomalies.
What is the purpose of the CB pin on LM2672MX-ADJ?
The CB (bootstrap capacitor) pin on the LM2672MX-ADJ connects to a 0.01 μF ceramic capacitor tied to the VSW switching node. This bootstrap network generates a gate drive voltage above VIN to fully enhance the internal DMOS high-side switch, minimizing RDS(ON) conduction losses and sustaining >90% efficiency at 1 A. Without proper CB–VSW decoupling, the LM2672MX-ADJ exhibits reduced output current capability, increased thermal stress, and potential regulation instability due to insufficient gate overdrive.
Can LM2672MX-ADJ operate with input voltage below 8 V?
No, the LM2672MX-ADJ has a recommended minimum input voltage of 6.5 V but guarantees full specification compliance only above 8 V. Operation below 8 V may result in dropout, reduced output current, or failure to regulate-especially near the lower end of the adjustable output range (e.g., 1.21 V). The LM2672MX-ADJ datasheet specifies electrical characteristics exclusively for VIN ≥8 V in the adjustable version, and its internal bias circuitry is optimized for stable startup and regulation within the 8–40 V window.
LM2672MX-ADJ 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:
- Obsolete
- 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 FAQ
1.How can I place an order for LM2672MX-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2672MX-ADJ 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 reliable?
The price and inventory of LM2672MX-ADJ 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 is usually 5 days.
3.What payment methods are accepted for LM2672MX-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2672MX-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2672MX-ADJ?
LM2672MX-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2672MX-ADJ 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?
For technical support, including LM2672MX-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2672MX-ADJ requirements.
6.How does Aetrix verify that LM2672MX-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2672MX-ADJ 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 meets industry standards.
7.What is the process for return or replacement of LM2672MX-ADJ?
All LM2672MX-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2672MX-ADJ, 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 part is unused and in its original packaging.
Return procedure for LM2672MX-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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