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Texas Instruments LM22671MRE-5.0/NOPB
- Part No.:
- LM22671MRE-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22671MRE-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 500MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,805
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Product details
Overview
LM22671MRE-5.0/NOPB from Texas Instruments is a 42 V, 500 mA synchronous step-down DC/DC regulator with fixed 5.0 V output, 500 kHz switching frequency, ±1.5% feedback reference accuracy, and integrated 200 mΩ N-channel MOSFET. It operates across –40°C to 125°C and delivers >90% efficiency in industrial power rails converting 12 V or 24 V inputs to stable 5 V logic supplies.
For engineers reviewing the LM22671MRE-5.0/NOPB datasheet, LM22671MRE-5.0/NOPB pinout, LM22671MRE-5.0/NOPB application, or LM22671MRE-5.0/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), thermal performance in HSOP-8 PowerPAD™, soft-start programmability via external capacitor, precision enable threshold (1.6 V typ), and compatibility with low-ESR ceramic output capacitors.
Technical Context
The LM22671MRE-5.0/NOPB implements a voltage-mode PWM controller with input voltage feed-forward for stable loop gain across wide VIN ranges. Its internal Type III compensation is optimized for fixed 5 V output, eliminating external compensation components.
It integrates a bootstrap gate driver with dedicated BOOT/SW pins to drive the high-side N-MOSFET, requires no external bootstrap diode, and enforces minimum on-time (100 ns) and off-time (100 ns) to ensure boot-cap recharge and prevent sub-harmonic oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.5% over –40°C to 125°C junction temperature |
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to 24 V industrial rails and automotive battery transients |
| Switching Frequency | 500 kHz default - enables compact 4.7 µH inductors and 22 µF ceramic output capacitors |
| Max Output Current | 500 mA - sustained under full thermal limits with proper PCB copper area on exposed pad |
| RDS(ON) | 200 mΩ typical - reduces conduction loss at full load; specified up to 125°C |
| Enable Threshold | 1.6 V typical falling threshold with 0.6 V hysteresis - enables precise power sequencing with resistor dividers |
| Quiescent Current | 3.4 mA typical at VFB = 5 V - balances light-load efficiency and startup speed |
| Thermal Shutdown | 150°C junction - latches off until thermal recovery; protects against sustained overload or poor heatsinking |
Pinout & Package
LM22671MRE-5.0/NOPB uses an HSOP-8 package with exposed thermal pad (PowerPAD™), measuring 4.89 mm × 3.90 mm. The exposed pad must be soldered to a dedicated GND copper pour for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply node | Connects to SW and external 10 nF ceramic capacitor; supplies gate drive for high-side MOSFET |
| EN | Enable control input | Logic-level input with 1.6 V threshold; pulls up internally at 6 µA - allows direct tie to VIN or resistor-divider sequencing |
| SW | Switch node | Drives external inductor; swings from ~0 V to VIN; requires low-inductance layout to minimize EMI |
| FB | Feedback input | Internally connected to 5.0 V reference - no external divider needed for fixed-output version |
| GND | System ground | Power and signal return; connects to exposed pad - critical for thermal dissipation and noise immunity |
| VIN | Main input supply | Accepts 4.5–42 V; requires local 10 µF ceramic input capacitor near pin 7 |
| RT/SYNC | Oscillator mode control | Floating = 500 kHz internal clock; resistor-to-GND = adjustable frequency (200–1000 kHz); external clock = synchronization |
| SS | Soft-start timing | Connect external capacitor (100 nF–1 µF) to set ramp time; internal current source = 50 µA |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boot-strap diode | Eliminates external diode requirement - simplifies BOM and improves reliability of high-side gate drive |
| Stable with ceramic capacitors | Supports low-ESR MLCCs down to 10 µF - avoids bulk electrolytics and reduces board space |
| Adjustable soft-start | External capacitor sets output ramp time - prevents inrush current into downstream loads and LDOs |
| Precision enable with UVLO | 1.6 V enable threshold + 0.6 V hysteresis - enables clean power-up sequencing and optional external under-voltage lockout |
| WEBENCH® enabled | Full parametric design support in TI's online tool - includes component selection, thermal simulation, and schematic export |
| Thermal shutdown + current limit | 150°C junction cutoff and 0.7 A peak switch current limit - provides robust fault protection without external circuitry |
Applications
| Industrial Control | Telecom Power |
|---|---|
Use Scenario: Powering PLC I/O modules and sensor interfaces from unregulated 24 V DC rails subject to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Primary 5 V buck regulator delivering regulated logic supply to microcontrollers, ADCs, and digital isolators. Use Value: 42 V absolute max rating withstands 40 V transients; 500 mA output sustains multiple isolated RS-485 transceivers and analog front-ends. | Use Scenario: Generating 5 V bias for Ethernet PHYs and PoE interface controllers in access switches and base stations. IC Role / Device Role / Timing Role: Secondary point-of-load regulator fed from intermediate 12 V bus; synchronized to system clock via RT/SYNC pin. Use Value: 500 kHz fixed frequency minimizes EMI overlap with Ethernet harmonics; synchronization eliminates beat frequencies in multi-rail systems. |
| Embedded Systems | Automotive Body Electronics |
Use Scenario: Providing 5 V supply to ARM Cortex-M based edge nodes with real-time sensor fusion and wireless connectivity. IC Role / Device Role / Timing Role: Main system regulator powering MCU core, flash memory, and BLE/Wi-Fi radio subsystems. Use Value: –40°C to 125°C operation ensures reliability in sealed enclosures; soft-start prevents brown-out during cold boot. | Use Scenario: Powering infotainment display controllers and LIN gateway MCUs in dashboard clusters. IC Role / Device Role / Timing Role: Non-automotive-grade variant used in non-safety-critical body electronics where AEC-Q100 not mandated. Use Value: 4.5 V min input supports start-stop battery operation down to 6 V; precision enable allows coordination with main ECU wake-up signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670MRE-5.0/NOPB | Same pinout and package, but 40 V max input (vs. 42 V); 400 kHz default frequency; lower RDS(ON) (180 mΩ) | Suitable for 12 V/24 V systems with tighter input transient margins; less headroom for 42 V surge events | Select when input never exceeds 40 V and higher light-load efficiency is prioritized over transient robustness |
| TPS54302DDCR | 36 V max input; 2.5 A output; 500 kHz fixed frequency; integrated compensation; smaller SOT-23-6 package | Better suited for space-constrained designs requiring >500 mA; lacks boot-strapped high-side drive - uses different topology | Choose for higher current needs or ultra-compact layouts where 36 V input ceiling is acceptable |
Compared with LM22671MRE-5.0/NOPB, LM22670MRE-5.0/NOPB trades 2 V input margin for slightly better conduction loss, while TPS54302DDCR offers 5× higher current in half the footprint but requires revalidation of loop stability and thermal layout.
Availability
LM22671MRE-5.0/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power, and embedded systems requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for LM22671MRE-5.0/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 ICs, with decades of expertise in high-reliability DC/DC conversion.
The LM22671MRE-5.0/NOPB belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use in cost-sensitive, thermally constrained applications where minimal external components and fast design-in are critical.
FAQ
What is the maximum input voltage rating for LM22671MRE-5.0/NOPB?
The LM22671MRE-5.0/NOPB has an absolute maximum input voltage rating of 43 V, with recommended continuous operation from 4.5 V to 42 V. This 42 V upper limit allows reliable operation across automotive battery transients and industrial 24 V rail surges. Exceeding 43 V risks permanent damage per the Absolute Maximum Ratings table in the SNVS589N datasheet.
Does LM22671MRE-5.0/NOPB require an external feedback resistor divider?
No, LM22671MRE-5.0/NOPB does not require an external feedback resistor divider. It is the fixed 5.0 V output variant - the FB pin is internally connected to the 5.0 V reference. Unlike the LM22671-ADJ version, no external resistors are needed, simplifying layout and reducing component count for standard 5 V applications.
How is thermal performance managed in LM22671MRE-5.0/NOPB?
LM22671MRE-5.0/NOPB uses an HSOP-8 PowerPAD™ package with an exposed thermal pad that must be soldered to a large GND copper area. Its junction-to-ambient thermal resistance (RθJA) is 60°C/W under standard JEDEC test conditions. To maintain ≤125°C junction temperature at 500 mA, ≥2 cm² of 2-oz copper connected to the pad is recommended, per TI's layout guidelines in Section 10.2 of SNVS589N.
Can LM22671MRE-5.0/NOPB be synchronized to an external clock?
Yes, LM22671MRE-5.0/NOPB supports external clock synchronization via the RT/SYNC pin. When driven with a clean CMOS clock between 500 kHz and 1 MHz, the device locks to the rising edge. However, enabling synchronization disables current-limit foldback - a trade-off documented in Section 7.3.3 of the datasheet. The internal 500 kHz oscillator resumes automatically if the external clock is lost.
What is the soft-start behavior of LM22671MRE-5.0/NOPB?
LM22671MRE-5.0/NOPB features an internal 50 µA soft-start current source on the SS pin. Connecting an external capacitor (e.g., 100 nF) sets the output voltage ramp time per tSS ≈ CSS × 5 V / 50 µA. A 100 nF cap yields ~10 ms ramp; 1 µF yields ~100 ms. Soft-start resets during EN pin deactivation or thermal shutdown, ensuring controlled restart after faults.
LM22671MRE-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM22671MRE-5.0/NOPB FAQ
1.How can I place an order for LM22671MRE-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22671MRE-5.0/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 LM22671MRE-5.0/NOPB reliable?
The price and inventory of LM22671MRE-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM22671MRE-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM22671MRE-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22671MRE-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22671MRE-5.0/NOPB?
LM22671MRE-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22671MRE-5.0/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 LM22671MRE-5.0/NOPB?
For technical support, including LM22671MRE-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22671MRE-5.0/NOPB requirements.
6.How does Aetrix verify that LM22671MRE-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22671MRE-5.0/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 LM22671MRE-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM22671MRE-5.0/NOPB?
All LM22671MRE-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22671MRE-5.0/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 LM22671MRE-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM22671MRE-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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