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Texas Instruments LM2675LD-5.0
- Part No.:
- LM2675LD-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFDFN Exposed Pad
- Datasheet:
-
LM2675LD-5.0.pdf
- Description:
- IC REG BUCK 5V 1A 16WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,750
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Product details
Overview
LM2675LD-5.0 from Texas Instruments is a monolithic step-down (buck) DC-DC switching regulator delivering 5.0 V at up to 1 A output current, operating from 8 V to 40 V input, with ±1.5% output voltage tolerance and 90% typical efficiency at 12 VIN/1 A. It integrates a DMOS power MOSFET switch, fixed 260 kHz oscillator, internal compensation, and thermal/current protection-designed for compact, high-efficiency power conversion in industrial and embedded systems.
For engineers reviewing the LM2675LD-5.0 datasheet, LM2675LD-5.0 pinout, LM2675LD-5.0 application, or LM2675LD-5.0 equivalent, key selection considerations include its fixed 5.0 V output, SOIC-8 package footprint, 260 kHz switching frequency enabling small external filter components, TTL-compatible ON/OFF control, and bootstrapped high-side gate drive requiring a 470 nF CB capacitor.
Technical Context
The LM2675LD-5.0 implements a synchronous-free buck topology using an integrated DMOS high-side switch and external catch diode. Its internal 260 kHz oscillator drives a current-mode control loop with patented frequency compensation, eliminating need for external compensation networks. Feedback is internally tied to the output for fixed 5.0 V operation, bypassing external resistor dividers.
Functional modes include active regulation (ON/OFF ≥ 1.4 V) and low-power shutdown (ON/OFF ≤ 1.4 V, ISTBY = 50–100 μA). Protection includes cycle-by-cycle current limiting (1.25–2.1 A), thermal shutdown, and frequency foldback under short-circuit conditions-enabling robust operation without external fault management circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.5% over line/load/temperature - ensures stable logic supply without trimming or calibration. |
| Max Output Current | 1 A continuous - supports microcontroller cores, FPGAs, and peripheral rails in space-constrained designs. |
| Input Voltage Range | 8 V to 40 V - accommodates 12 V/24 V industrial buses and automotive battery variations with dropout headroom. |
| Switching Frequency | 260 kHz (±10%) - enables use of standard, low-cost 33–68 μH shielded inductors and reduces EMI compared to higher-frequency alternatives. |
| Efficiency | 90% typical at 12 VIN/1 A - minimizes thermal load; PCB copper traces suffice as sole heatsink per TI design guidance. |
| Quiescent Current | 3.6 mA active, 50–100 μA standby - supports low-power wake-on-event architectures with rapid enable/disable transitions. |
| Protection Features | Thermal shutdown, cycle-by-cycle current limit, frequency foldback - provides autonomous fault recovery without system-level supervision. |
Pinout & Package
LM2675LD-5.0 is supplied in an 8-pin SOIC (D package), 4.9 mm × 6.0 mm body with gull-wing leads. Thermal performance is specified at RθJA = 105°C/W on a 1-in² copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB (Pin 1) | Bootstrap capacitor connection | Connects 470 nF ceramic capacitor to VSW to generate gate drive voltage for internal high-side DMOS switch. |
| NC (Pins 2, 3) | No-connect | Internally unconnected; must remain floating or grounded per layout best practices-no routing or loading. |
| FB (Pin 4) | Feedback sense input | Internally connected to 5.0 V output; no external divider required-simplifies layout and eliminates resistor tolerance error. |
| ON/OFF (Pin 5) | Enable control input | TTL-compatible digital input: ≥1.4 V = active regulation; ≤0.8 V = shutdown with 50 μA standby current. |
| VIN (Pin 7) | Main power input | Accepts 8–40 V DC; requires local 22 μF tantalum bypass capacitor with short, low-inductance path to GND. |
| GND (Pin 6) | Power ground | Primary return for VIN, VSW, and COUT; must be low-impedance plane tie point for all power components. |
| VSW (Pin 8) | Switch node output | Drives external Schottky catch diode and inductor; high dv/dt node requiring tight layout and minimal trace area. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated DMOS power switch | Eliminates external high-side MOSFET and driver IC-reducing BOM count and layout complexity by 4+ components. |
| Patented internal frequency compensation | Enables stable operation with only 5 external parts (inductor, diode, input/output caps, bootstrap cap)-no loop compensation design needed. |
| Fixed-frequency 260 kHz operation | Ensures predictable EMI profile and simplifies input filter design versus variable-frequency controllers. |
| TTL-compatible ON/OFF control | Allows direct interfacing with microcontroller GPIOs or logic supervisors-no level-shifting circuitry required. |
| Thermal + current-limit protection | Autonomously disables switching during overload or overheating-prevents damage without external monitoring circuits. |
Applications
| Industrial PLC I/O Power | Embedded Microcontroller Core Supply |
|---|---|
Use Scenario: Providing isolated 5 V rail for digital I/O modules in programmable logic controllers operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V field power to clean, regulated 5 V for logic-level interface circuitry and optocouplers. Use Value: Delivers 1 A at 90% efficiency with no heatsink required-reducing module size and thermal derating concerns in dense backplane environments. | Use Scenario: Powering ARM Cortex-M or RISC-V SoC core voltage domains in edge sensor nodes with battery or PoE input. IC Role / Device Role / Timing Role: Main DC-DC converter generating stable 5.0 V for USB peripherals, ADC references, and FPGA configuration banks. Use Value: Fixed 5.0 V output and internal feedback eliminate resistor network errors-ensuring precise voltage compliance for sensitive analog and digital subsystems. |
| Point-of-Load for Fieldbus Transceivers | Preregulator for Linear Regulators |
Use Scenario: Generating 5 V for RS-485/RS-422 transceivers in factory automation gateways powered from wide-range 12–36 V supplies. IC Role / Device Role / Timing Role: Efficient intermediate-stage regulator supplying clean 5 V to transceiver ICs before final LDO filtering. Use Value: 260 kHz switching allows compact 33–47 μH inductors-minimizing board area while maintaining >85% efficiency across full input range. | Use Scenario: Reducing 24 V industrial supply to ~6.5 V prior to low-noise LDOs powering precision analog front-ends or clock buffers. IC Role / Device Role / Timing Role: High-efficiency preregulator lowering dropout voltage and heat dissipation for downstream linear regulators. Use Value: 94% efficiency at 24 VIN/1 A cuts power loss by >75% versus direct 24 V-to-5 V linear regulation-extending thermal margin and reliability. |
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-5.0 | Higher 52 kHz switching frequency; larger external components; lower efficiency (~75–80%) | Less suitable for space-constrained or thermally limited layouts due to larger inductor/capacitor requirements | Select when legacy compatibility or ultra-low EMI is prioritized over size/efficiency |
| TPS54202DRT | 2 MHz synchronous buck; integrated high/low-side FETs; 4.5–28 V input; adjustable output | Requires external feedback resistors and has different pinout-design not drop-in compatible | Select for higher density, better light-load efficiency, or adjustable output flexibility-not for pin-for-pin replacement |
Compared with LM2675LD-5.0, LM2575H-5.0 trades efficiency and size for lower EMI and legacy support, while TPS54202DRT offers modern synchronous integration but demands redesign effort-neither is pin-compatible, making LM2675LD-5.0 optimal for cost-sensitive, fixed-5V SOIC-based buck applications requiring proven thermal performance and minimal external parts.
Availability
LM2675LD-5.0 is available at Aetrix Electronics and suitable for industrial PLCs, embedded microcontroller power supplies, fieldbus transceiver modules, and preregulator stages requiring stable component supply, long-lifecycle support, and consistent SOIC-8 packaging.
Supply support for LM2675LD-5.0 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 series belongs to TI's SIMPLE SWITCHER® family-engineered for ease-of-use in cost-sensitive, medium-power DC-DC applications where minimal external components, robust protection, and predictable thermal behavior are critical.
FAQ
What is the maximum input voltage rating for the LM2675LD-5.0?
The LM2675LD-5.0 has an absolute maximum input voltage rating of 45 V, with recommended operating range from 8 V to 40 V. Operation above 40 V risks exceeding safe junction temperature or violating SOIC package thermal limits-even if within absolute max ratings-so 40 V is the practical upper limit for continuous operation per TI's recommended conditions.
Does the LM2675LD-5.0 require external feedback resistors to set its output voltage?
No. The LM2675LD-5.0 is the fixed 5.0 V version: its FB pin is internally connected to the regulated output, eliminating the need for external resistor dividers. This simplifies layout, removes resistor tolerance errors, and improves long-term stability-unlike the adjustable LM2675 variants which require external R1/R2 networks.
Can the LM2675LD-5.0 be used in discontinuous conduction mode (DCM)?
Yes. The LM2675LD-5.0 operates in both continuous and discontinuous conduction modes depending on load and inductor value. At light loads (<300 mA with typical 47 μH inductor), it naturally enters DCM-reducing switching losses and improving light-load efficiency, as confirmed by TI's Figure 5-16 transient waveforms and efficiency curves.
What type of external diode is recommended for use with the LM2675LD-5.0?
A Schottky rectifier rated ≥3.3 A and ≥50 V reverse voltage is recommended-such as the IR 30WQ05F cited in TI's Figure 7-1 reference design. Schottky diodes minimize forward voltage drop and reverse recovery losses, directly supporting the LM2675LD-5.0's 90% efficiency target and thermal performance goals.
Is thermal derating required for the LM2675LD-5.0 when operating at full 1 A load?
Not if PCB layout follows TI's guidelines: use ≥1 in² of 2-oz copper connected to GND pins, minimize VIN/GND loop inductance, and ensure adequate airflow. With proper layout, the LM2675LD-5.0 delivers full 1 A at ambient temperatures up to 85°C without external heatsinking-leveraging its 105°C/W RθJA and high efficiency to keep junction temperature within 125°C limit.
LM2675LD-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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):
- 5V
- 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:
- 16-WSON (5x5)
LM2675LD-5.0 FAQ
1.How can I place an order for LM2675LD-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2675LD-5.0 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 LM2675LD-5.0 reliable?
The price and inventory of LM2675LD-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2675LD-5.0 is usually 5 days.
3.What payment methods are accepted for LM2675LD-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2675LD-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2675LD-5.0?
LM2675LD-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2675LD-5.0 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 LM2675LD-5.0?
For technical support, including LM2675LD-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2675LD-5.0 requirements.
6.How does Aetrix verify that LM2675LD-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2675LD-5.0 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 LM2675LD-5.0 meets industry standards.
7.What is the process for return or replacement of LM2675LD-5.0?
All LM2675LD-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2675LD-5.0, 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 LM2675LD-5.0 part is unused and in its original packaging.
Return procedure for LM2675LD-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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