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Texas Instruments LM2675N-ADJ/NOPB
- Part No.:
- LM2675N-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM2675N-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,684
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Product details
Overview
LM2675N-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 8 V to 40 V input voltage range - used in compact, high-efficiency power supplies for industrial control and embedded systems.
For engineers reviewing the LM2675N-ADJ/NOPB datasheet, LM2675N-ADJ/NOPB pinout, LM2675N-ADJ/NOPB application, or LM2675N-ADJ/NOPB equivalent, key selection considerations include feedback-based output programming, thermal shutdown and cycle-by-cycle current limiting, SOIC-8 package compatibility, and minimal external component count (5 total).
Technical Context
The LM2675N-ADJ/NOPB integrates a DMOS high-side power switch, internal frequency compensation, and a 260 kHz oscillator to implement a complete synchronous-buck topology without requiring external timing components. Its feedback loop regulates output by maintaining 1.21 V on the FB pin via an external resistor divider.
It operates in active mode when the ON/OFF pin exceeds 1.4 V (typical), drawing 3.6 mA quiescent current, and enters low-power shutdown at ≤1.4 V with 50 μA standby current. Protection includes thermal shutdown, cycle-by-cycle current limit (1.25–2.1 A), and frequency foldback under short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 1 A continuous - supports mid-power loads without external pass devices or heatsinking. |
| Input voltage range | 8 V to 40 V - accommodates wide-input industrial rails, battery-backed systems, and unregulated DC sources. |
| Output voltage range | 1.21 V to 37 V adjustable - set precisely via external R1/R2 divider; enables flexible rail generation. |
| Feedback reference | 1.21 V ±1.5% - defines regulation accuracy; determines output error budget in closed-loop design. |
| Switching frequency | 260 kHz (±10%) - enables use of small, low-cost inductors and capacitors while avoiding AM band interference. |
| Efficiency | Up to 96% - minimizes power loss and PCB trace heating; eliminates need for dedicated heatsinks. |
| Quiescent current | 3.6 mA (active), 50 μA (shutdown) - balances light-load efficiency and fast wake-up response. |
Pinout & Package
LM2675N-ADJ/NOPB is supplied 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 Rev. JUNE 2025.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Connects 470 nF ceramic capacitor between CB and VSW to drive high-side MOSFET gate; critical for proper switch conduction. |
| FB | Feedback sense input | Monitors output voltage via resistor divider; regulates output by holding this node at 1.21 V; open or shorted condition causes failure. |
| GND | Power ground | Primary return path for input/output capacitors and internal switch; must be low-inductance, short-trace connection to system ground plane. |
| ON/OFF | Enable control input | TTL-compatible logic input: ≥1.4 V = ON, ≤0.8 V = OFF; pulls up internally; 50 μA standby current when low. |
| VIN | Input supply | Accepts 8–40 V DC; connects to high-frequency bypass capacitor (CIN) with minimal trace length to reduce noise and EMI. |
| VSW | Switch node output | Drives external inductor and catch diode cathode; carries high dv/dt switching waveform; requires tight layout and shielding. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 260 kHz oscillator | Enables predictable EMI profile and consistent filter design; avoids variable-frequency jitter and subharmonic instability. |
| Internal frequency compensation | Eliminates need for external compensation network - reduces BOM count and design iteration time. |
| Thermal + current limit protection | Self-protecting under overload, short-circuit, or ambient overheating; recovers automatically after fault removal. |
| Low-component-count design | Requires only 5 external parts (inductor, diode, CIN, COUT, R1/R2) - accelerates prototyping and lowers manufacturing cost. |
| TTL-compatible enable | Direct interface with microcontroller GPIO or logic-level sequencers without level-shifting circuitry. |
Applications
| Industrial Power Supply | Embedded System Rail Generator |
|---|---|
|
Use Scenario: Converting 24 V factory bus to 5 V/3.3 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable, regulated DC output with high efficiency and low thermal rise. Use Value: Eliminates linear regulator heat dissipation; maintains >90% efficiency across 100 mA–1 A load range; simplifies thermal management on dense PCBs. |
Use Scenario: Generating processor core and peripheral voltages in edge-computing gateways with space-constrained layouts. IC Role / Device Role / Timing Role: Adjustable-output DC-DC converter enabling single-BOM support for multiple voltage configurations. Use Value: 1.21 V reference and resistor-divider programming allow precise rail tuning; 260 kHz switching permits compact 3.3 mm × 3.3 mm inductor footprints. |
| Preregulator for Linear Regulators | Positive-to-Negative Converter |
|
Use Scenario: Reducing 12 V input to ~2 V above LDO dropout before final low-noise regulation for analog circuits. IC Role / Device Role / Timing Role: Efficient pre-regulation stage minimizing power loss upstream of sensitive linear regulators. Use Value: Delivers 1 A at 90%+ efficiency, cutting input power demand by >50% vs. direct LDO drop from 12 V; improves overall system thermal margin. |
Use Scenario: Generating –5 V from +12 V supply for op-amp biasing or RS-232 transceivers in legacy instrumentation. IC Role / Device Role / Timing Role: Buck converter reconfigured as inverting topology using external inductor and diode. Use Value: Leverages same IC and layout footprint as buck mode; achieves –5 V @ 500 mA with <100 mV ripple using standard passive components. |
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, 3 A current limit, higher quiescent current (10 mA active), no integrated bootstrap driver. | Lower switching frequency demands larger magnetics; better suited for high-current, low-EMI designs where size is secondary. | Select when needing higher peak current headroom or lower EMI sensitivity; requires external bootstrap capacitor. |
| TPS54202DDCR | 2.5–17 V input, 400 kHz–2.2 MHz adjustable frequency, 2 A output, integrated high/low-side FETs, soft-start, and sync capability. | Supports smaller inductors and tighter transient response; requires more complex compensation but offers greater flexibility. | Choose for modern, high-density designs needing programmable frequency, higher current, or synchronization with other rails. |
Compared with LM2675N-ADJ/NOPB, LM2575H-ADJ trades higher current and ruggedness for lower efficiency and larger filters, while TPS54202DDCR provides higher integration and dynamic performance at the cost of increased design complexity and reduced input voltage range.
Availability
LM2675N-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, embedded system rail generation, and preregulator applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2675N-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 decades of expertise in high-reliability power conversion ICs.
The LM2675 belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use, minimal external component count, and robust operation in industrial and commercial power applications without requiring expert SMPS knowledge.
FAQ
What is the maximum output voltage that can be set using LM2675N-ADJ/NOPB?
The LM2675N-ADJ/NOPB supports an adjustable output voltage range from 1.21 V to 37 V, determined by the external resistor divider connected to the FB pin. The upper limit is constrained by the absolute maximum VIN rating (45 V) and practical stability limits of the feedback network; operation above 37 V risks violating the FB pin voltage rating or exceeding safe duty cycle margins.
Does LM2675N-ADJ/NOPB require an external bootstrap capacitor?
Yes, LM2675N-ADJ/NOPB requires a 470 nF ceramic capacitor connected between the CB and VSW pins to charge the high-side MOSFET gate driver. This capacitor must be placed close to the IC with short, low-inductance traces; omission or undersizing causes erratic switching or failure to start.
Can LM2675N-ADJ/NOPB operate with an input voltage below 8 V?
No - the LM2675N-ADJ/NOPB has a minimum recommended input voltage of 6.5 V, but stable regulation is only guaranteed above 8 V per TI's electrical characteristics table. Below 8 V, the device may fail to sustain output regulation under load due to insufficient headroom for the internal switch and control circuitry.
How does the ON/OFF pin function on LM2675N-ADJ/NOPB?
The ON/OFF pin on LM2675N-ADJ/NOPB is a TTL-compatible enable input: applying ≥1.4 V (typical) turns the regulator on, while ≤0.8 V places it in shutdown mode with 50 μA standby current. The pin has internal pull-up, so floating defaults to ON; no external pull-up resistor is required unless driving from open-drain logic.
What is the purpose of the FB pin on LM2675N-ADJ/NOPB?
The FB pin on LM2675N-ADJ/NOPB senses the output voltage via an external resistor divider and compares it to an internal 1.21 V reference. The regulator adjusts its duty cycle to maintain exactly 1.21 V at FB - making it the critical node for output voltage accuracy, stability, and transient response in all LM2675N-ADJ/NOPB applications.
LM2675N-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM2675N-ADJ/NOPB FAQ
1.How can I place an order for LM2675N-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2675N-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 LM2675N-ADJ/NOPB reliable?
The price and inventory of LM2675N-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 LM2675N-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2675N-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2675N-ADJ/NOPB transactions.
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4.How is shipping managed for LM2675N-ADJ/NOPB?
LM2675N-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2675N-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 LM2675N-ADJ/NOPB?
For technical support, including LM2675N-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2675N-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2675N-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2675N-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 LM2675N-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2675N-ADJ/NOPB?
All LM2675N-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2675N-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 LM2675N-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2675N-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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