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Texas Instruments LM2675M-ADJ/NOPB
- Part No.:
- LM2675M-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2675M-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,153
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Product details
Overview
LM2675M-ADJ/NOPB 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-frequency operation, ±1.5% output voltage tolerance, and 1.21 V feedback reference voltage. It operates across an 8 V to 40 V input range and supports adjustable output from 1.21 V to 37 V, commonly used in industrial power supplies and embedded system point-of-load regulation.
For engineers reviewing the LM2675M-ADJ/NOPB datasheet, LM2675M-ADJ/NOPB pinout, LM2675M-ADJ/NOPB application, or LM2675M-ADJ/NOPB equivalent, key selection considerations include its SOIC-8 package footprint, internal frequency compensation, TTL-compatible enable control, thermal shutdown protection, and minimal external component count (only 5 required).
Technical Context
The LM2675M-ADJ/NOPB implements a current-mode buck topology with an integrated high-side DMOS switch and patented internal frequency compensation. Its 260 kHz oscillator enables compact LC filter design while maintaining stable regulation under line and load transients.
Feedback is sensed at the FB pin referenced to a precise 1.21 V internal bandgap, enabling output programming via external resistor divider. Shutdown is controlled via TTL-level ON/OFF pin with 50 μA standby current, and protection includes cycle-by-cycle current limiting and thermal shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1 A maximum continuous - supports mid-power embedded loads without external boost stages. |
| Input Voltage Range | 8 V to 40 V - compatible with 12 V/24 V industrial rails and unregulated adapter inputs. |
| Switching Frequency | 260 kHz fixed - enables use of standard low-ESR electrolytic or tantalum output capacitors and 10–68 µH inductors. |
| Feedback Reference | 1.21 V ±1.5% - sets output voltage accuracy and defines resistor-divider ratio for adjustable configurations. |
| Efficiency | Up to 96% - minimizes thermal dissipation; PCB copper traces serve as sole heatsink in most designs. |
| Quiescent Current | 3.6 mA active / 50 µA standby - enables low-power operation during sleep modes. |
| Protection Features | Thermal shutdown + current limit - prevents damage during overload, short-circuit, or poor layout conditions. |
Pinout & Package
LM2675M-ADJ/NOPB is packaged in an 8-pin SOIC (D package), 4.9 mm × 6 mm body size, with exposed pad not present. Pin functions are validated per TI SNVS129G datasheet Figure 4-1 and Table 4-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Connects 470 nF ceramic capacitor between CB and VSW to gate-drive the internal high-side FET. |
| FB | Feedback sense input | Monitors output voltage via resistor divider; regulates VOUT by holding FB = 1.21 V. |
| GND | Power ground | Primary return path for VIN bypass, output capacitor, and internal switch; must be low-inductance. |
| ON/OFF | Enable control input | TTL-compatible logic input: ≥1.4 V = active, ≤0.8 V = shutdown (50 µA ISTBY). |
| VIN | Input supply | Accepts 8–40 V DC; requires local 22 µF tantalum or ceramic bypass capacitor near pin. |
| VSW | Switch node output | Drives external inductor and catch diode; high dv/dt node requiring tight layout and ground shielding. |
| NC | No-connect | Pins 2 and 3 are unused; must remain unconnected and unbonded per TI specification. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | Eliminates need for external MOSFET and driver; RDS(on) = 0.3 Ω ensures <1 W conduction loss at 1 A. |
| Patented internal frequency compensation | Enables stable loop response with only 5 external components-no external compensation network required. |
| Fixed 260 kHz oscillator | Reduces EMI filtering burden vs. variable-frequency controllers and allows predictable filter sizing. |
| Adjustable output (1.21–37 V) | Supports wide-range system rails using two resistors; FB pin bias current <100 nA preserves divider accuracy. |
| TTL shutdown with low ISTBY | Enables system-level power sequencing and battery-backed sleep modes with <50 µA quiescent draw. |
Applications
| Industrial PLC Power Supply | Embedded Microcontroller Core Rail |
|---|---|
Use Scenario: Providing clean, regulated 3.3 V or 5 V from a 24 V factory bus to power PLC I/O modules and communication interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated 24 V to stable low-voltage rail with fast transient response to digital load steps. Use Value: High efficiency (>90%) reduces heat buildup in sealed enclosures; thermal shutdown protects against ambient temperature excursions. | Use Scenario: Generating a dedicated 1.8 V or 2.5 V core supply for ARM Cortex-M or RISC-V microcontrollers in portable edge devices. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured via precision resistor divider to match processor VDD requirements. Use Value: ±1.5% output tolerance ensures reliable CPU operation across temperature; 260 kHz switching avoids audible noise in sensitive acoustic environments. |
| Test Equipment Auxiliary Rail | LED Driver Pre-Regulator |
Use Scenario: Delivering a stable ±12 V or 15 V auxiliary rail for op-amp signal conditioning circuits in benchtop DMMs and oscilloscopes. IC Role / Device Role / Timing Role: Efficient preregulator preceding linear regulators to minimize dropout and thermal stress on LDOs. Use Value: Reduces power dissipation in downstream LDOs by lowering input-to-output differential; improves overall system efficiency by >35% vs. direct linear regulation. | Use Scenario: Stepping down 36 V automotive or 48 V PoE input to ~30 V before constant-current LED driver stage. IC Role / Device Role / Timing Role: Constant-voltage pre-regulator ensuring consistent headroom for high-brightness LED strings. Use Value: Wide 8–40 V input range accommodates varying source voltages; current limit protection prevents catastrophic failure during LED open-circuit faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2575H-ADJ | 52 kHz switching frequency, higher RDS(on) (0.4 Ω), lower max input (40 V same), no CB pin | Requires larger inductors/capacitors; less suitable for space-constrained designs needing high efficiency | Prefer LM2675M-ADJ/NOPB when board area or thermal performance is critical. |
| TPS54202DRT | 2.5 MHz sync buck, 2 A rating, integrated soft-start, smaller 6-pin SOT-23 package | Higher cost, more complex layout; better for ultra-compact, high-density PCBs | Choose TPS54202DRT only if 2.5 MHz operation and 2 A capability justify added complexity and cost. |
Compared with LM2575H-ADJ and TPS54202DRT, the LM2675M-ADJ/NOPB offers optimal balance of simplicity (5-component design), thermal robustness (SOIC-8 with GND pins), and proven reliability in industrial environments-making it ideal for cost-sensitive, medium-power applications where layout flexibility and long-term supply stability matter.
Availability
LM2675M-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial PLC power supplies, embedded microcontroller core rails, test equipment auxiliary rails, and LED driver pre-regulators requiring stable component supply and long-lifecycle support.
Supply support for LM2675M-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 leader specializing in analog, embedded processing, and power management technologies, with over 50 years of innovation in high-reliability power conversion solutions.
The LM2675 series belongs to TI's SIMPLE SWITCHER® family, designed specifically for engineers seeking easy-to-use, highly efficient, and application-ready DC-DC buck regulators with minimal external component count and robust protection features.
FAQ
What is the maximum output voltage achievable with LM2675M-ADJ/NOPB?
The LM2675M-ADJ/NOPB supports an adjustable output voltage range from 1.21 V to 37 V, set by an external resistor divider connected to the FB pin. This upper limit is constrained by the absolute maximum switch node voltage rating and internal reference stability-not by the IC's regulation circuitry. Operation above 37 V risks violating the VSW-to-GND absolute maximum rating of 45 V, so 37 V represents the verified safe operational ceiling per TI's electrical characteristics table.
Does LM2675M-ADJ/NOPB require an external bootstrap capacitor?
Yes, LM2675M-ADJ/NOPB requires a 470 nF ceramic capacitor connected between the CB and VSW pins to provide gate drive voltage for the internal high-side DMOS switch. This bootstrap capacitor is essential for proper high-side FET operation and is explicitly mandated in the datasheet's pin function description and typical application schematic. Omitting it causes immediate regulation failure or device latch-up.
Can LM2675M-ADJ/NOPB operate with input voltage below 8 V?
No, LM2675M-ADJ/NOPB has a minimum recommended input voltage of 6.5 V but a functional minimum of 8 V for guaranteed regulation across all load and temperature conditions. Below 8 V, the internal switch may not fully enhance, leading to excessive RDS(on), thermal runaway, or inability to sustain 1 A output. The datasheet specifies 8–40 V as the valid operating range for full performance compliance.
What is the purpose of the NC pins on LM2675M-ADJ/NOPB?
The NC (no-connect) pins on LM2675M-ADJ/NOPB-pins 2 and 3 in the SOIC-8 package-are physically present but electrically unconnected to any internal circuitry. TI explicitly states they must remain unconnected and unbonded during assembly. Routing traces to or placing vias on these pins can introduce parasitic coupling or mechanical stress, potentially degrading thermal performance or causing intermittent faults.
How does the ON/OFF pin interface with microcontroller GPIOs?
The ON/OFF pin of LM2675M-ADJ/NOPB is TTL-compatible: driving it to ≥1.4 V (e.g., 3.3 V or 5 V logic HIGH) enables regulation, while pulling it ≤0.8 V (or grounding) places LM2675M-ADJ/NOPB in shutdown mode with 50 µA standby current. It draws only 20 µA at 25°C, making it directly drivable by most MCU GPIOs without level-shifting or buffering-ideal for firmware-controlled power sequencing.
LM2675M-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
LM2675M-ADJ/NOPB FAQ
1.How can I place an order for LM2675M-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2675M-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 LM2675M-ADJ/NOPB reliable?
The price and inventory of LM2675M-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 LM2675M-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2675M-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2675M-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2675M-ADJ/NOPB?
LM2675M-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2675M-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 LM2675M-ADJ/NOPB?
For technical support, including LM2675M-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2675M-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2675M-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2675M-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 LM2675M-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2675M-ADJ/NOPB?
All LM2675M-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2675M-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 LM2675M-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2675M-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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