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Texas Instruments LM2672M-3.3
- Part No.:
- LM2672M-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2672M-3.3.pdf
- Description:
- IC REG BUCK 3.3V 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,650
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Product details
Overview
LM2672M-3.3 from Texas Instruments is a monolithic 1-A step-down (buck) DC-DC voltage regulator with fixed 3.3-V output, 260-kHz fixed-frequency switching, ±1.5% output voltage tolerance over line and load, 8 V to 40 V input range, and integrated DMOS power MOSFET. It delivers high-efficiency power conversion in industrial control power supplies.
For engineers reviewing the LM2672M-3.3 datasheet, LM2672M-3.3 pinout, LM2672M-3.3 application, or LM2672M-3.3 equivalent, key selection criteria include output accuracy under wide input variation, thermal performance in SOIC-8 without heatsinking, soft-start control for inrush management, and compatibility with standard Schottky catch diodes and low-ESR output capacitors.
Technical Context
The LM2672M-3.3 implements a current-mode PWM controller with internal 260-kHz oscillator and patented frequency compensation, enabling stable regulation with minimal external components. Its integrated high-side DMOS FET features 0.3 Ω typical RDS(ON) at 25°C and supports up to 1-A continuous output current with cycle-by-cycle current limiting.
Functional modes include active regulation (ON/OFF ≥1.4 V), TTL-compatible shutdown (ON/OFF ≤0.8 V), and soft-start via external capacitor on SS pin. The FB pin is internally connected to the 3.3-V output divider, eliminating external feedback resistors - unlike the adjustable version which requires external resistor networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±1.5% over –40°C to 125°C, 8 V–40 V input, 20 mA–1 A load - ensures stable logic rail generation without trimming. |
| Switching Frequency | 260 kHz (±10%) - enables use of compact 47–68 µH inductors and reduces EMI filtering burden vs. lower-frequency buck regulators. |
| Max Output Current | 1 A continuous - supports single-rail microcontroller, FPGA I/O, or sensor subsystems without derating at 70°C ambient. |
| Input Voltage Range | 8 V to 40 V - accommodates 12 V/24 V industrial bus systems with transient margin; minimum dropout ~1.5 V at full load. |
| Efficiency | 86% at VIN = 12 V, IOUT = 1 A - minimizes self-heating; PCB copper traces suffice as sole heat sink per TI thermal data. |
| Quiescent Current | 3.6 mA typical in operation; 50 µA standby - enables low-power wake-up architectures with ON/OFF pin control. |
| Current Limit | 1.25 A to 2.1 A (min–max) - provides robust short-circuit protection while avoiding nuisance tripping during load transients. |
Pinout & Package
LM2672M-3.3 is packaged in an 8-pin SOIC (D package) with 5.00 mm × 6.20 mm body size and standard JEDEC MS-012AC footprint. Thermal resistance RθJA is 105°C/W, permitting operation up to 125°C junction temperature with minimal board copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CB) | Bootstrap capacitor connection | Connects 100-nF ceramic capacitor to VSW to gate-drive high-side DMOS FET fully ON - critical for <0.3 Ω RDS(ON) and efficiency. |
| 2 (SS) | Soft-start control | Accepts external capacitor to linearly ramp output voltage - prevents inrush into large output capacitance or downstream LDOs. |
| 3 (SYNC) | Frequency synchronization input | Accepts external TTL/CMOS clock >275 kHz to lock switching frequency - enables EMI reduction and multi-regulator phase alignment. |
| 4 (FB) | Feedback sense | Internally tied to 3.3-V output divider - no external resistors required; direct connection to output capacitor ensures precise regulation. |
| 5 (ON/OFF) | Enable/disable control | TTL-compatible input: ≥1.4 V = ON, ≤0.8 V = OFF; 50 µA standby current enables low-power system sleep states. |
| 6 (GND) | Power ground | Main return path for input capacitor (CIN), output capacitor (COUT), and internal switch - must be low-inductance, short trace to minimize noise. |
| 7 (VIN) | Input supply | High-side FET collector node - connects to 8–40 V source and high-frequency bypass capacitor; layout demands shortest possible path to GND. |
| 8 (VSW) | Switch node | Drain of internal high-side FET - drives external inductor and Schottky catch diode; high dv/dt node requiring tight loop area to limit EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | Eliminates external high-side MOSFET and driver - reduces BOM count and layout complexity while maintaining 1-A capability. |
| Patented internal frequency compensation | Enables stable operation with only 5 external components (inductor, diode, CIN, COUT, CCB) - no loop compensation design required. |
| Thermal shutdown + current limit | Protects against sustained overload or ambient overheating without external circuitry - automatic recovery after fault removal. |
| Soft-start and frequency sync | Prevents input surge and allows synchronized switching across multiple rails - essential for noise-sensitive analog or RF subsystems. |
| TTL shutdown with 50 µA standby | Supports system-level power sequencing and battery-backed sleep modes - compatible with standard logic-level GPIOs. |
Applications
| Industrial PLC I/O Power | Automotive Body Control Module |
|---|---|
Use Scenario: Powers 3.3-V digital I/O banks in programmable logic controllers operating from 24-V DC bus with ±15% ripple and 40–85°C ambient. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, regulated 3.3-V rail to microcontroller peripherals and isolated digital inputs/outputs. Use Value: ±1.5% output tolerance ensures reliable logic-level compatibility across temperature and line variation; 260-kHz switching enables small 47-µH inductor footprint. | Use Scenario: Supplies 3.3-V domain for CAN transceivers, LIN interface ICs, and door module MCUs in 12-V automotive systems with cold-crank down to 6.5 V. IC Role / Device Role / Timing Role: Pre-regulator stepping down unregulated vehicle battery voltage to stable 3.3-V supply before LDO post-regulation. Use Value: 8–40 V input range covers cold-crank (6.5 V min) and load-dump (40 V max); 86% efficiency minimizes heat buildup in sealed enclosures. |
| Medical Sensor Hub | Point-of-Sale Terminal |
Use Scenario: Powers low-noise analog front-ends and ADCs in portable diagnostic devices powered by 12-V Li-ion packs with strict EMI limits. IC Role / Device Role / Timing Role: Main DC-DC converter generating 3.3-V analog and digital supply rails with synchronized switching to avoid beat frequencies in sensitive signal paths. Use Value: SYNC pin enables locking to system clock or adjacent converters - eliminates variable-frequency ripple that could alias into ADC measurements. | Use Scenario: Provides 3.3-V rail for EMV contactless payment readers, display controllers, and secure element ICs in retail terminals with 24-V wall adapters. IC Role / Device Role / Timing Role: High-reliability primary regulator supporting hot-plug insertion and firmware updates without brownout. Use Value: Soft-start (SS pin) prevents inrush into large display backlight capacitors; 1-A rating supports simultaneous NFC, LCD, and crypto operations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2671M-3.3 | 3-A output current, same 260-kHz frequency and SOIC-8 package, but higher quiescent current (5 mA vs. 3.6 mA) and no SYNC pin. | Better suited for higher-current loads (e.g., multi-core MCU domains), but lacks frequency synchronization for noise-sensitive designs. | Select LM2671M-3.3 only when >1-A output is required and SYNC functionality is unnecessary. |
| TPS5430DDAR | 3-A synchronous buck, 500-kHz switching, integrated high/low-side FETs, 3.5-V–36-V input, but requires external compensation and has different pinout. | Higher efficiency (>92%) and smaller solution size due to synchronous rectification, but increased design complexity and cost. | Choose TPS5430DDAR when efficiency >90% and board space are critical, and design resources support compensation tuning. |
Compared with LM2671M-3.3 and TPS5430DDAR, the LM2672M-3.3 offers optimal balance of simplicity (5-component design), built-in SYNC for EMI control, and proven thermal performance in SOIC-8 - making it ideal for cost-sensitive, noise-aware industrial and embedded applications where 1-A output suffices.
Availability
LM2672M-3.3 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical sensor hubs, and point-of-sale terminals requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production lots.
Supply support for LM2672M-3.3 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 expertise in high-reliability power conversion ICs.
The LM2672M-3.3 belongs to TI's SIMPLE SWITCHER® family - designed specifically for engineers needing fast, robust, low-component-count DC-DC solutions for industrial, automotive, and medical equipment without complex compensation or layout iteration.
FAQ
What is the maximum input voltage rating for LM2672M-3.3?
The absolute maximum input voltage for LM2672M-3.3 is 45 V, but the recommended operating range is 8 V to 40 V per TI's Electrical Characteristics table. Operation above 40 V risks exceeding safe operating area limits under transient conditions, and the device is not guaranteed to regulate beyond 40 V. Always refer to Section 7.1 Absolute Maximum Ratings and Section 7.3 Recommended Operating Conditions in the LM2672M-3.3 datasheet for design margins.
Does LM2672M-3.3 require external feedback resistors?
No, LM2672M-3.3 does not require external feedback resistors. As a fixed-output variant, its internal resistor divider is factory-trimmed to set 3.3 V at the FB pin, and the FB pin is internally connected to the output. Per Section 6 Pin Functions, "Connect this pin directly to the output capacitor for a fixed output version." External resistors are only needed for the adjustable (LM2672MX-ADJ) variant.
Can LM2672M-3.3 synchronize to an external clock?
Yes, LM2672M-3.3 supports external clock synchronization via the SYNC pin. When driven with a TTL/CMOS-compatible signal >275 kHz (e.g., 400 kHz), the internal 260-kHz oscillator locks to the external frequency. TI specifies AC-coupling via a 100-pF capacitor and 1-kΩ pull-down resistor. Note that current-limit frequency foldback is disabled during SYNC operation, so short-circuit protection relies solely on cycle-by-cycle current limiting.
What is the thermal resistance (RθJA) of LM2672M-3.3 in SOIC-8 package?
The junction-to-ambient thermal resistance (RθJA) for LM2672M-3.3 in the SOIC-8 (D) package is 105°C/W, as specified in Section 7.4 Thermal Information of the datasheet. This value assumes standard JEDEC 4-layer test board conditions. With 86% efficiency at 1 A and 12-V input, power dissipation is ~2 W - resulting in ~210°C rise above ambient, confirming that PCB copper area must serve as primary heatsink per TI's thermal guidance.
Is LM2672M-3.3 RoHS compliant and lead-free?
Yes, LM2672M-3.3 is RoHS compliant and lead-free. TI's official packaging information (Section 14 Mechanical, Packaging, and Orderable Information) confirms Pb-Free (RoHS) marking for SOIC-8 variants, and the device carries the "Green" designation per TI's environmental compliance documentation. All LM2672M-3.3 units supplied by Aetrix Electronics meet JEDEC J-STD-020 moisture sensitivity level 3 and IPC/JEDEC J-STD-033 handling requirements.
LM2672M-3.3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 6.5V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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
LM2672M-3.3 FAQ
1.How can I place an order for LM2672M-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2672M-3.3 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 LM2672M-3.3 reliable?
The price and inventory of LM2672M-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2672M-3.3 is usually 5 days.
3.What payment methods are accepted for LM2672M-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2672M-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2672M-3.3?
LM2672M-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2672M-3.3 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 LM2672M-3.3?
For technical support, including LM2672M-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2672M-3.3 requirements.
6.How does Aetrix verify that LM2672M-3.3 is sourced from the original manufacturer or authorized distributors?
All LM2672M-3.3 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 LM2672M-3.3 meets industry standards.
7.What is the process for return or replacement of LM2672M-3.3?
All LM2672M-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2672M-3.3, 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 LM2672M-3.3 part is unused and in its original packaging.
Return procedure for LM2672M-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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