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Texas Instruments LM22671MR-ADJ/NOPB
- Part No.:
- LM22671MR-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22671MR-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:1,399
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Product details
Overview
LM22671MR-ADJ/NOPB from Texas Instruments is a 42 V, 500 mA synchronous step-down DC/DC regulator in an HSOP-8 PowerPAD package. It features voltage-mode PWM control, internal loop compensation, and a 200 mΩ N-channel MOSFET switch. Designed for industrial and embedded systems, it delivers stable output down to 1.285 V with ±1.5% feedback reference accuracy and operates across –40°C to 125°C junction temperature.
For engineers reviewing the LM22671MR-ADJ/NOPB datasheet, LM22671MR-ADJ/NOPB pinout, LM22671MR-ADJ/NOPB application, or LM22671MR-ADJ/NOPB equivalent, key selection criteria include adjustable output (1.285 V min), 4.5–42 V input range, 500 kHz default switching frequency, precision enable threshold (1.6 V typ), and thermal shutdown protection.
Technical Context
The LM22671MR-ADJ/NOPB implements a voltage-mode constant-frequency PWM architecture with input voltage feed-forward to stabilize loop gain against VIN variations. Its internal Type III compensation is optimized for outputs ≤5 V, enabling stable operation with low-ESR ceramic capacitors without external compensation components.
It integrates a bootstrap gate driver for the high-side N-MOSFET, requiring a 10 nF ceramic capacitor between BOOT and SW pins. The device supports three oscillator modes-internal 500 kHz, resistor-adjustable (200 kHz–1 MHz), or external synchronization-though frequency adjustment and sync cannot operate simultaneously.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide industrial rails including 12 V, 24 V, and battery-backed systems. |
| Output Current | 500 mA - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained designs. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; enables precise regulation of sub-3.3 V logic supplies. |
| Switching Frequency | 500 kHz (default) - balances efficiency, transient response, and external component size (e.g., 4.7 µH inductor). |
| RDS(ON) | 200 mΩ - reduces conduction loss at full load; contributes to >90% peak efficiency at mid-load conditions. |
| Enable Threshold | 1.6 V (typ), 0.6 V hysteresis - allows clean power sequencing using simple resistor dividers from upstream rails. |
| Thermal Shutdown | 150°C - protects against sustained overload or poor PCB thermal design; auto-recovery on cooldown. |
Pinout & Package
LM22671MR-ADJ/NOPB is housed in an HSOP-8 package (4.89 mm × 3.90 mm) with exposed thermal pad (EP) that must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply input | Provides gate drive voltage for internal high-side MOSFET; requires 10 nF ceramic cap to SW. |
| EN | Enable control input | Logic-level shutdown pin with 1.6 V threshold and 0.6 V hysteresis; draws only 25 µA in shutdown. |
| SW | Switch node output | Drives external inductor; swings from GND to VIN; requires low-inductance layout to minimize EMI. |
| FB | Feedback input | Senses output via resistive divider; internal 1.285 V reference sets VOUT = 1.285 × (1 + R1/R2). |
| GND | Power and signal ground | Common return for power stage and control circuitry; connects to EP for thermal path. |
| RT/SYNC | Oscillator mode selector | Floating = 500 kHz; resistor-to-GND = adjustable freq (200 kHz–1 MHz); external clock = sync mode. |
| SS | Soft-start timing | Controls startup ramp time via external capacitor; default internal ramp is ~500 µs. |
| VIN | Main power input | Accepts 4.5–42 V; powers internal bias circuitry and high-side driver; requires local 10 µF ceramic input cap. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network; simplifies design for 1.285–5 V outputs. |
| Integrated bootstrap diode | Removes external bootstrap diode requirement; reduces BOM count and layout complexity. |
| Adjustable soft-start | Prevents inrush current via external capacitor on SS pin; avoids input rail droop during startup. |
| Precision enable with UVLO | Enables reliable power sequencing and optional external under-voltage lockout using EN pin. |
| Stable with ceramic output capacitors | Supports low-ESR MLCCs (e.g., 22 µF X5R) - reduces board area vs. tantalum or electrolytic alternatives. |
Applications
| Industrial Control | Telecom/Datacom Systems |
|---|---|
Use Scenario: Powering PLC I/O modules and sensor interfaces in factory automation cabinets with 24 V DC bus. IC Role / Device Role / Timing Role: Primary buck converter generating 3.3 V or 5 V for microcontroller, ADC, and digital isolators. Use Value: Wide 4.5–42 V input handles brownouts and transients; thermal shutdown ensures reliability in unventilated enclosures. | Use Scenario: Point-of-load regulation in optical line cards where space and efficiency are critical. IC Role / Device Role / Timing Role: Secondary DC/DC stage converting 12 V backplane to 1.8 V or 2.5 V for FPGAs and SerDes PHYs. Use Value: 500 kHz switching enables compact magnetics; ±1.5% reference supports tight core voltage tolerances. |
| Embedded Systems | Conversions from Standard Input Rails |
Use Scenario: Power management in portable test equipment with battery + adapter input. IC Role / Device Role / Timing Role: Single-chip solution replacing discrete buck controller + MOSFET + driver. Use Value: Integrated 200 mΩ MOSFET and bootstrap diode reduce footprint by >40% vs. controller-based designs. | Use Scenario: Down-converting legacy 24 V or 12 V industrial supplies to modern 3.3 V or 5 V logic rails. IC Role / Device Role / Timing Role: High-voltage buck regulator eliminating need for pre-regulator stages. Use Value: 42 V absolute max rating provides 20% margin over 24 V nominal; robust against load dump events. |
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-ADJ/NOPB | Lower 3 V min input, 40 V max input, same 500 mA output and HSOP-8 package. | Lacks 42 V rating; unsuitable for 36 V+ automotive or industrial transients. | Select when input stays below 40 V and higher efficiency at light loads is prioritized. |
| TPS54302DDCR | 3.5–28 V input, 3 A output, 2.5 MHz switching, no integrated bootstrap diode. | Higher current, smaller package (SOT-23-6), but requires external bootstrap diode and compensation. | Choose for space-constrained 3 A designs where 28 V max input is acceptable. |
Compared with LM22670MR-ADJ/NOPB, LM22671MR-ADJ/NOPB adds 2 V headroom for 42 V operation and improved transient immunity; versus TPS54302DDCR, it trades higher current and frequency for integration simplicity and ruggedness in high-VIN industrial use cases.
Availability
LM22671MR-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom/datacom systems, and embedded systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compatible performance margins.
Supply support for LM22671MR-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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The LM22671MR-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family-designed for ease-of-use in non-isolated DC/DC conversion with minimal external components and full WEBENCH® design tool integration.
FAQ
What is the minimum output voltage achievable with LM22671MR-ADJ/NOPB?
The LM22671MR-ADJ/NOPB has a fixed internal feedback reference voltage of 1.285 V (±1.5%). When configured in adjustable mode, the minimum regulated output voltage equals this reference-i.e., 1.285 V-achievable with FB tied directly to VOUT. Lower voltages are not supported due to internal reference limitation, and the device will not regulate stably below this value. This makes LM22671MR-ADJ/NOPB suitable for powering 1.3 V–5 V logic rails but not sub-1.3 V cores.
Does LM22671MR-ADJ/NOPB require an external bootstrap diode?
No, LM22671MR-ADJ/NOPB integrates a bootstrap diode internally. The BOOT pin connects to the source of the high-side MOSFET and charges the external 10 nF bootstrap capacitor during the low-side conduction phase. This eliminates the need for an external Schottky diode, reducing component count and layout complexity. However, proper placement of the BOOT–SW capacitor with short, wide traces remains critical for reliable gate drive.
Can LM22671MR-ADJ/NOPB synchronize to an external clock?
Yes, LM22671MR-ADJ/NOPB supports external synchronization via the RT/SYNC pin. When an external clock signal (1.75 V threshold, 1 MHz max) is applied during startup, the device latches into sync mode and locks to the rising edge of that clock. Synchronization is only active if the external frequency exceeds the internal 500 kHz oscillator and remains stable; loss of the external clock causes automatic fallback to 500 kHz operation. Note: sync mode disables current limit foldback.
What thermal considerations apply to LM22671MR-ADJ/NOPB in HSOP-8 PowerPAD package?
LM22671MR-ADJ/NOPB has a junction-to-ambient thermal resistance (RθJA) of 60°C/W in the HSOP-8 PowerPAD package. To maintain safe operation at full 500 mA load across –40°C to 125°C ambient, the exposed pad (EP) must be soldered to a minimum 100 mm² copper pour connected to system ground. Without adequate copper area or airflow, junction temperature may exceed 150°C triggering thermal shutdown. Thermal simulation in WEBENCH® is recommended for board-specific validation.
How does the enable pin (EN) function in LM22671MR-ADJ/NOPB?
The EN pin of LM22671MR-ADJ/NOPB provides precision on/off control with a 1.6 V typical turn-on threshold and 0.6 V hysteresis. Pulling EN below 1.3 V (min) disables the regulator, reducing quiescent current to 25 µA. An internal 6 µA pullup allows direct connection to VIN for always-on operation, though a 470 kΩ resistor is recommended for 42 V inputs to limit zener current. EN also supports external UVLO implementation using a resistor divider for battery discharge protection or controlled start-up sequencing.
LM22671MR-ADJ/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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 1.285V
- Voltage - Output (Max):
- 37V
- 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-ADJ/NOPB FAQ
1.How can I place an order for LM22671MR-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22671MR-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 LM22671MR-ADJ/NOPB reliable?
The price and inventory of LM22671MR-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 LM22671MR-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22671MR-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22671MR-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22671MR-ADJ/NOPB?
LM22671MR-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22671MR-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 LM22671MR-ADJ/NOPB?
For technical support, including LM22671MR-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22671MR-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22671MR-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22671MR-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 LM22671MR-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22671MR-ADJ/NOPB?
All LM22671MR-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22671MR-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 LM22671MR-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22671MR-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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