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Texas Instruments LM22671MR-5.0/NOPB
- Part No.:
- LM22671MR-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22671MR-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 500MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,044
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Product details
Overview
LM22671MR-5.0/NOPB from Texas Instruments is a 42 V, 500 mA synchronous step-down DC/DC regulator in an HSOP-8 PowerPAD package, delivering a fixed 5.0 V output with ±1.5% feedback reference accuracy, 500 kHz default switching frequency, and integrated 200 mΩ N-channel MOSFET. It operates across –40°C to 125°C and supports industrial power conversion from 12 V or 24 V rails.
For engineers reviewing the LM22671MR-5.0/NOPB datasheet, LM22671MR-5.0/NOPB pinout, LM22671MR-5.0/NOPB application, or LM22671MR-5.0/NOPB equivalent, key selection considerations include its fixed 5 V output, internal voltage-mode compensation, precision enable threshold (1.6 V typ), soft-start programmability via external capacitor, and thermal shutdown protection.
Technical Context
The LM22671MR-5.0/NOPB implements a voltage-mode PWM controller with input voltage feed-forward to stabilize loop gain against VIN variations, enabling optimized transient response. Its internal Type III compensation is pre-tuned for fixed 5 V output operation and eliminates external compensation components.
It integrates a high-side N-channel MOSFET switch (RDS(ON) = 0.24 Ω typ), bootstrap gate drive circuitry requiring an external BOOT–SW ceramic capacitor, and a precision enable comparator with 0.6 V hysteresis and 6 µA internal pull-up current. The RT/SYNC pin supports three modes: internal 500 kHz oscillator, resistor-adjustable 200–1000 kHz, or external synchronization - but not simultaneous adjustment and sync.
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 regulation from 12 V/24 V industrial rails without pre-regulation |
| Switching Frequency | 500 kHz default; adjustable 200–1000 kHz or synchronizable to external clock - enables EMI control and small magnetics |
| Max Output Current | 500 mA continuous - limited by internal 0.7 A peak current limit and thermal design with PowerPAD |
| RDS(ON) | 0.24 Ω typical - reduces conduction loss at full load; enables >90% efficiency at mid-load |
| Enable Threshold | 1.6 V typical falling threshold with 0.6 V hysteresis - allows precise sequencing and external UVLO implementation |
| Soft-Start | Programmable via SS pin capacitor - extends startup time beyond internal 500 µs baseline to limit inrush current |
Pinout & Package
LM22671MR-5.0/NOPB uses the HSOP-8 PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad (EP) that must be soldered to PCB ground for thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply input | Provides gate drive voltage for internal high-side MOSFET; requires 10 nF ceramic capacitor between BOOT and SW |
| EN | Precision enable input | Active-high logic control with 1.6 V threshold and 0.6 V hysteresis; 6 µA internal pull-up enables simple resistor-based sequencing |
| SW | Switch node output | Drives external inductor; swings from ~0 V to VIN; requires low-inductance layout to minimize ringing and EMI |
| FB | Feedback input | Internally connected to 5.0 V reference; unused in fixed-output version but must be tied to VOUT per datasheet guidance |
| GND | Power and signal ground | Common return for all circuits; EP pad must be connected to GND plane for thermal and noise performance |
| RT/SYNC | Oscillator mode control | Selects internal 500 kHz, resistor-adjusted frequency (200–1000 kHz), or external synchronization - latched at startup |
| SS | Soft-start timing input | Sinks 50 µA current; external capacitor sets ramp time - prevents output overshoot and limits input inrush |
| VIN | Main input supply | Accepts 4.5–42 V; requires local 10 µF ceramic input capacitor near VIN–GND pins |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boot-Strap Diode | Eliminates need for external bootstrap diode - simplifies layout and improves reliability of high-side gate drive |
| Stable with Ceramic Output Capacitors | Supports low-ESR ceramic capacitors (≥10 µF) without external compensation - reduces board area and cost |
| Adjustable Soft-Start | External capacitor on SS pin controls startup slew rate - prevents system-level brownouts during power-up |
| Thermal Shutdown & Current Limit | 150°C junction shutdown and 0.7 A peak current limit protect against overload and PCB thermal failure |
| WEBENCH® Enabled | Fully supported in TI's WEBENCH Power Designer - provides component selection, efficiency simulation, and thermal modeling |
Applications
| Industrial Control Power | Telecom Line Card Supply |
|---|---|
Use Scenario: Providing clean 5 V bias to PLC I/O modules, sensor interfaces, and fieldbus transceivers in harsh factory environments. IC Role / Device Role / Timing Role: Primary point-of-load (POL) regulator converting 24 V rail to isolated 5 V logic supply with high line/load regulation. Use Value: Wide 4.5–42 V input range accommodates 24 V nominal with ±20% variation; –40°C to 125°C rating ensures operation in uncooled enclosures. | Use Scenario: Generating 5 V for FPGA configuration, microcontroller cores, and Ethernet PHYs on telecom line cards with strict EMI limits. IC Role / Device Role / Timing Role: Fixed-output buck converter operating at 500 kHz with optional synchronization to avoid spectral interference with data clocks. Use Value: Adjustable RT/SYNC pin enables EMI band steering; integrated compensation avoids tuning delays in high-volume production. |
| Embedded System Main Rail | Automotive Body Control Module |
Use Scenario: Delivering 5 V main power to ARM-based embedded controllers, display drivers, and USB peripherals in medical or test equipment. IC Role / Device Role / Timing Role: High-efficiency primary regulator replacing linear regulators to reduce heat and extend battery life in portable designs. Use Value: >90% efficiency at 300 mA load minimizes thermal stress; soft-start prevents reset glitches during cold boot. | Use Scenario: Powering infotainment microcontrollers and CAN transceivers in body control units where input voltage may dip to 4.5 V during cranking. IC Role / Device Role / Timing Role: Robust buck converter with UVLO (4.3 V rising threshold) and precision enable for controlled power sequencing. Use Value: Internal UVLO prevents erratic behavior during engine start; EN pin hysteresis ensures clean turn-on/turn-off transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670MR-5.0/NOPB | Lower 3 V minimum input voltage; identical 5 V output, package, and pinout - but lacks RT/SYNC and soft-start features | Preferred for ultra-low-input systems (e.g., 5 V input rails); unsuitable where frequency sync or controlled startup is required | Select LM22671MR-5.0/NOPB when synchronization, adjustable frequency, or programmable soft-start is needed. |
| TPS54302DDCR | 3.5–28 V input range; 500 mA output; 2.5 V to 15 V adjustable output - fixed 5 V requires external resistors; no integrated bootstrap diode | Better suited for lower-voltage inputs (e.g., 12 V only); requires external compensation and bootstrap diode - increases BOM count | Choose LM22671MR-5.0/NOPB for simplified design with wide input, fixed 5 V, and minimal external components. |
Compared with LM22670MR-5.0/NOPB, LM22671MR-5.0/NOPB adds critical flexibility in frequency control and startup management; versus TPS54302DDCR, it delivers true plug-and-play 5 V regulation with fewer external parts and broader input capability.
Availability
LM22671MR-5.0/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power, and embedded system applications requiring stable component supply, long-term lifecycle support, and automotive-grade reliability assurance.
Supply support for LM22671MR-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 power conversion solutions.
The LM22671MR-5.0/NOPB belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use in cost-sensitive, space-constrained DC/DC applications where minimal external components and fast design-in are critical.
FAQ
What is the maximum input voltage rating for LM22671MR-5.0/NOPB?
The absolute maximum input voltage for LM22671MR-5.0/NOPB is 43 V, but the recommended operating range is 4.5 V to 42 V. Operation above 42 V risks permanent damage, while below 4.5 V prevents proper startup due to internal UVLO. The device maintains regulation across this full range with consistent 5.0 V output accuracy and efficiency.
Does LM22671MR-5.0/NOPB require external compensation components?
No, LM22671MR-5.0/NOPB features fully internal Type III loop compensation optimized for fixed 5 V output. This eliminates external compensation networks, reducing BOM count and layout complexity. Stability is guaranteed with standard ceramic output capacitors (≥10 µF) and typical power inductors used in buck converters.
How is the soft-start time configured on LM22671MR-5.0/NOPB?
The soft-start time on LM22671MR-5.0/NOPB is set by an external capacitor connected to the SS pin, which sinks a constant 50 µA current. A 100 nF capacitor yields ~2 ms startup; 1 µF extends it to ~20 ms. This programmability prevents inrush current spikes and output overshoot during power-up, and the internal 500 µs baseline applies only when SS is left open.
Can LM22671MR-5.0/NOPB synchronize to an external clock?
Yes, LM22671MR-5.0/NOPB supports external synchronization via the RT/SYNC pin. When driven with a clean square wave (1.75 V threshold, <1 MHz), it locks to the rising edge of the external clock. Synchronization is latched at startup and overrides both internal and resistor-adjusted modes - but disables current-limit foldback during short-circuit events.
What thermal management is required for LM22671MR-5.0/NOPB at full load?
LM22671MR-5.0/NOPB has a junction-to-ambient thermal resistance (RθJA) of 60°C/W in the HSOP-8 PowerPAD package. At 500 mA output and 12 V input, typical power dissipation is ~0.5 W; thus, a 30°C ambient requires ≤120°C junction - achievable with ≥1 cm² copper pour under the EP pad. Thermal shutdown activates at 150°C to prevent damage.
LM22671MR-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
LM22671MR-5.0/NOPB FAQ
1.How can I place an order for LM22671MR-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22671MR-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 LM22671MR-5.0/NOPB reliable?
The price and inventory of LM22671MR-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 LM22671MR-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM22671MR-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22671MR-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22671MR-5.0/NOPB?
LM22671MR-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22671MR-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 LM22671MR-5.0/NOPB?
For technical support, including LM22671MR-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22671MR-5.0/NOPB requirements.
6.How does Aetrix verify that LM22671MR-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22671MR-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 LM22671MR-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM22671MR-5.0/NOPB?
All LM22671MR-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22671MR-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 LM22671MR-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM22671MR-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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