LM2675M-5.0/NOPB - 1A, 5V Fixed SIMPLE SWITCHER Buck Regulator | Texas Instruments
MPN: LM2675M-5.0/NOPB ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.84 | $2.84 |
| 10 | $2.55 | $25.50 |
| 100 | $2.27 | $227.00 |
| 500 | $2.04 | $1,020.00 |
| 1,000 | $1.81 | $1,810.00 |
LM2675M-5.0/NOPB Overview
Key specifications include a 1A continuous output current rating, a 260 kHz internal oscillator that enables small magnetics, and ±1.5% output voltage tolerance over the specified input and load range. The fixed 5V version is internally trimmed, while the ADJ variant sets output via an external resistor divider. The LM2675 family falls within the broader category of switching regulators (buck converter -> step-down regulator -> DC-DC converter -> power management IC), designed to replace older three-terminal linear regulators with significantly higher efficiency.
The LM2675M-5.0/NOPB features built-in thermal shutdown, cycle-by-cycle current limiting, and an on/off enable input for power sequencing. The internal MOSFET switch and CMOS gate driver are integrated on the same die, eliminating the need for an external power switch. Its wide 6.5V to 40V input range supports 12V and 24V industrial bus rails directly, while the fixed 5V output is well-suited to powering logic, microcontrollers, and 5V subsystems.
Typical applications include point-of-load regulation in industrial equipment, distributed 5V rails in automotive subsystems, distributed power architectures fed from 12V or 24V buses, and battery-powered systems where efficiency matters. The low external component count also simplifies manufacturing and reduces BOM cost.
When designing with the LM2675, follow the datasheet inductor and capacitor selection guides closely - choosing a low-ESR input capacitor and a Schottky catch diode rated for the switching current is essential for stable operation. The PCB layout should keep the catch diode loop and the feedback trace short to avoid injecting switching noise into the output.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a single reference for sourcing, selection, and PCB-level integration of the LM2675M-5.0/NOPB.
Drop-in alternatives for LM2675M-5.0/NOPB — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LM2675M-5.0/NOPB (same form factor and footprint) — differing in Output Voltage, Package, Operating Temperature Range, RoHS Status, Switching Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LM2675M-ADJ/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
LM2675MX-5.0/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
LM2676M-5.0/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
LM2675M-5.0
✅ Drop-In📋 Reference alternative (not in catalog)
LM2674M-5.0/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
LM2675M-5.0/NOPB Maximum Ratings & Electrical Characteristics
| Topology | Step-Down (Buck) |
| Output Configuration | Positive Fixed |
| Output Voltage | 5 V (fixed) |
| Input Voltage Range | 6.5 V to 40 V |
| Output Current | 1 A |
| Switching Frequency | 260 kHz (typical) |
| Oscillator Frequency Tolerance | ±10% |
| Output Voltage Tolerance | ±1.5% |
| Efficiency | Up to ~90% (load and VIN dependent) |
| Operating Temperature Range | -40 C to +125 C |
| Operating Junction Temperature | +150 C max |
| Package | 8-pin SOIC (D), 0.154 inch (3.90 mm) width |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| Enable Pin | Yes (ON/OFF, TTL-compatible) |
| Process Technology | LMDMOS monolithic |
| RoHS Status | Compliant |
LM2675M-5.0/NOPB Pin Configuration
| Pin 1 | CB — Boot capacitor connection for the internal gate driver |
| Pin 2 | VIN — Input supply voltage (6.5V to 40V) |
| Pin 3 | ON/OFF — Enable input; tie to VIN for always-on, GND to disable |
| Pin 4 | GND — Ground reference and power return |
| Pin 5 | FB — Feedback (internally set for fixed 5V output) |
| Pin 6 | VOUT — Regulated 5V output (sensed internally) |
| Pin 7 | SW — Switch node; connect to catch diode and inductor |
| Pin 8 | PGND — Power ground for the internal MOSFET return |
Typical Applications
LM2675M-5.0/NOPB is suitable for 7 applications: Industrial 24V Bus to 5V Point-of-Load, Automotive 12V Battery Rail Regulation, Distributed 5V Supply in Telecom Equipment, Battery-Powered Portable Instruments, Microcontroller and Logic Power Supply, Embedded Sensor Hub Power, LED Driver Auxiliary 5V Supply.
Industrial 24V Bus to 5V Point-of-Load
The LM2675M-5.0/NOPB accepts a 6.5V to 40V input, which directly covers 24V industrial bus rails with surge headroom, and outputs a fixed 5V at 1A to power microcontrollers, sensors, and logic. With up to 90% efficiency at 12V to 24V input and 260 kHz switching that keeps magnetics small, it eliminates the need for a separate pre-regulator in 24V industrial systems. Recommended components are a 47 µH inductor, a 3A/40V Schottky (e.g. SS34), and a 22 µF low-ESR ceramic or electrolytic input capacitor.
Recommended
Automotive 12V Battery Rail Regulation
Automotive 12V battery rails subject to load-dump events up to 40V are tolerated by the LM2675M-5.0/NOPB's 6.5V to 40V input range. The fixed 5V output supplies body electronics, sensor clusters, and infotainment subsystems with ±1.5% regulation. For non-safety automotive applications, the LM2675M-5.0/NOPB provides 1A of current with cycle-by-cycle current limit and thermal shutdown for protection; pair it with a TVS clamp at the input for load-dump transients beyond 40V.
Recommended
Distributed 5V Supply in Telecom Equipment
In telecom and networking hardware, the LM2675M-5.0/NOPB provides a local 5V point-of-load from a 12V or 24V backplane, eliminating the need for long, lossy 5V traces. The 260 kHz switching frequency keeps the output LC filter small and the efficiency around 85% to 90% at typical loads, reducing heat-sink requirements. The enable pin supports power-sequencing for downstream MCUs or FPGAs that require rail-on sequencing in hot-swap or brownout recovery scenarios.
Recommended
Battery-Powered Portable Instruments
Portable battery-powered test and measurement instruments that step down a multi-cell battery stack to 5V benefit from the LM2675M-5.0/NOPB's high efficiency. With up to 90% efficiency at 12V to 5V conversion, battery life is significantly extended versus a three-terminal linear regulator. The 8-pin SOIC footprint fits dense handheld enclosures, and the enable pin supports low-Iq shutdown when the device is idle, reducing overall quiescent draw.
Recommended
Microcontroller and Logic Power Supply
The LM2675M-5.0/NOPB delivers 1A of regulated 5V at ±1.5% tolerance, ideal for powering 5V microcontrollers, logic families, and small peripherals. Its enable input allows software or hardware sequencing with downstream rails, which is critical for MCUs that require strict power-on ordering. With cycle-by-cycle current limit and thermal shutdown, it provides robust protection against load faults on the 5V rail during development and production.
Recommended
Embedded Sensor Hub Power
Embedded sensor hubs that aggregate analog front ends, digital sensors, and an MCU on a single PCB benefit from the LM2675M-5.0/NOPB's compact SOIC-8 footprint and low component count. The 5V fixed output supports both analog sensor bridges and 5V-tolerant digital I/O. The wide 6.5V to 40V input accepts 12V to 24V field-bus rails commonly found in building automation and process-control systems, while ±1.5% regulation preserves ADC accuracy.
Recommended
LED Driver Auxiliary 5V Supply
LED lighting drivers often include a low-current 5V auxiliary rail for controller ICs, fans, and status LEDs; the LM2675M-5.0/NOPB provides up to 1A at 5V directly from a 12V to 36V LED-driver input. The wide input range tolerates common LED-driver bus voltages without intermediate regulation, and the 260 kHz switching keeps the LC filter footprint small enough to fit inside the driver enclosure. Cycle-by-cycle current limit protects the auxiliary supply from shorts caused by wiring errors.
Recommended
Recommended Products Summary
Engineering reference data for LM2675M-5.0/NOPB — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM2675M-ADJ/NOPB | LM2675MX-5.0/NOPB | LM2676M-5.0/NOPB | LM2675M-5.0 (UMW) | LM2674M-5.0/NOPB |
|---|---|---|---|---|---|---|
| Package | SOIC-8 (D) | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 (D) - same | SOIC-8 - same | SOIC-8 (D) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | UMW | Texas Instruments |
| Output Voltage | 5 V (fixed) | Adjustable 1.23V to 37V | 5 V (fixed) | 5 V (fixed) | 5 V (fixed) | 5 V (fixed) |
| Output Current | 1 A | 1 A | 1 A | 3 A | 1 A | 500 mA |
| Input Voltage Range | 6.5V to 40V | 6.5V to 40V | 6.5V to 40V | 6.5V to 40V | 6.5V to 40V | 6.5V to 40V |
| Switching Frequency | 260 kHz | 260 kHz | 260 kHz | 260 kHz | 260 kHz | 260 kHz |
| Output Voltage Tolerance | ±1.5% | ±1.5% | ±1.5% | ±1.5% | ±1.5% | ±1.5% |
| Enable Pin | Yes (ON/OFF) | Yes (ON/OFF) | Yes (ON/OFF) | Yes (ON/OFF) | Yes (ON/OFF) | Yes (ON/OFF) |
Key Differentiators
- Wider 40V input range than typical 1A buck regulators (vs LM2675M-ADJ/NOPB)
- Direct current upgrade path with same footprint (vs LM2676M-5.0/NOPB)
- Documented UMW second source in same SOIC-8 (vs LM2675M-5.0 (UMW))
Design Notes
The fixed-5V version of the LM2675 uses an internal feedback network that bypasses the FB pin, so the FB pin must NOT be connected to an external resistor divider or the output will move off regulation. According to the TI datasheet, leave FB open (or to a 1nF bypass to GND) when using the fixed-output variant. Pulling FB with an external divider is only valid on the LM2675-ADJ variant.
Estimated: at VIN=24V, VOUT=5V, and 1A load, power dissipation is (24V-5V)*1A = 19W worst case if the switch is fully on. With the SOIC-8 (D) package theta_JA of ~150 C/W on a 1-square-inch copper pour, junction temperature can exceed 125 C. Use a 4-square-inch copper pour or the TO-263 (KT) package variant for 24V-input 1A designs to keep junction rise under 60 C above ambient.
Place the Schottky catch diode (e.g. SS34 or 1N5825) and the input bypass capacitor within 5 mm of the SW and VIN pins respectively to minimize the high-frequency switching loop. Keep the feedback trace (pin 5) short and away from the SW node to avoid injecting switching noise into the regulation loop. Use a single-point ground tie for PGND (pin 8) and GND (pin 4) at the input capacitor negative terminal, not at the IC.
The TI datasheet recommends an output inductor with low DCR (under ~0.1 ohm) to minimize copper loss; a 33 µH to 47 µH shielded inductor with >= 1.5 A saturation rating is typical for 5V/1A output at 24V input. With cycle-by-cycle current limit set ~1.4 A internally, an inductor with 1 A saturation will saturate at full load and reduce efficiency. Always derate the inductor saturation to at least 1.3x the load current.
Switching regulators like the LM2675 generate EMI at 260 kHz and harmonics; a small RC snubber (10 ohm + 1 nF) across the Schottky diode can reduce ringing on the SW node by 30% to 50%. For noise-sensitive analog loads, add a pi-filter (10 µH + 100 µF + 10 µH) at the output. According to the TI datasheet, switching frequency tolerance is ±10% over temperature, so EMI measurements should account for a 234 kHz to 286 kHz range.
Compliance Information
RoHS/REACH compliance per TI product page. NOPB suffix indicates lead-free matte-tin finish and Pb-free reflow compatibility. AEC-Q100 not qualified - use TI's automotive-grade TPS54x0 family if AEC-Q100 is required.
