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Texas Instruments LM22671MRX-ADJ/NOPB
- Part No.:
- LM22671MRX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22671MRX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:9,735
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Product details
Overview
LM22671MRX-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 adjustable output (down to 1.285 V), 500 kHz default switching frequency, ±1.5% feedback reference accuracy, and integrated 200 mΩ N-channel MOSFET. It is used in industrial power rails converting 12 V or 24 V inputs to low-voltage logic supplies.
For engineers reviewing the LM22671MRX-ADJ/NOPB datasheet, LM22671MRX-ADJ/NOPB pinout, LM22671MRX-ADJ/NOPB application, or LM22671MRX-ADJ/NOPB equivalent, key selection considerations include input voltage range (4.5–42 V), thermal performance with exposed pad, soft-start programmability via external capacitor, and RT/SYNC pin configurability for frequency adjustment or synchronization.
Technical Context
The LM22671MRX-ADJ/NOPB implements voltage-mode PWM control with input voltage feed-forward to stabilize loop gain across input variations. Its internal Type III compensation is optimized for outputs ≤5 V, enabling stable operation with ceramic output capacitors without external compensation components.
It integrates a bootstrap gate driver with dedicated BOOT/SW pins and supports three RT/SYNC modes: internal 500 kHz oscillator, resistor-adjustable 200 kHz–1 MHz, or external synchronization - though frequency adjust and sync cannot operate simultaneously. Thermal shutdown (150°C) and cycle-by-cycle current limiting (0.7 A typ) provide robust overload protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide industrial and automotive supply rails including unregulated 24 V systems. |
| Output Current | 500 mA continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; enables precise regulation down to sub-1.3 V with external resistor divider. |
| Switching Frequency | 500 kHz default (200 kHz–1 MHz adjustable) - balances efficiency, transient response, and external component size. |
| RDS(ON) | 200 mΩ (typ) - reduces conduction loss and improves full-load efficiency (>90% typical at 12 VIN/3.3 VOUT). |
| Quiescent Current | 3.4 mA (typ) - enables low-power operation in active mode; standby current drops to 25 µA when disabled. |
| Enable Threshold | 1.6 V (typ) with 0.6 V hysteresis - allows clean power sequencing using simple resistor dividers from upstream rails. |
Pinout & Package
LM22671MRX-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 capacitor between BOOT and SW. |
| EN | Enable control input | Logic-level precision enable with 1.6 V threshold and 0.6 V hysteresis; pulls up internally at ~6 µA. |
| SW | Switch node output | Drives external inductor; swings from GND to VIN; connects to BOOT capacitor and external diode/FET. |
| FB | Feedback input | Monitors output via resistor divider; regulates output by comparing to 1.285 V internal reference. |
| GND | System ground | Power and signal return; EP (exposed pad) must be connected to this node for thermal performance. |
| RT/SYNC | Oscillator control | Selects operating mode: floating = 500 kHz, resistor-to-GND = adjustable frequency, external clock = sync mode. |
| SS | Soft-start timing | Controls startup ramp time via external capacitor; default internal soft-start is ~500 µs. |
| VIN | Input supply | Primary power input (4.5–42 V); powers internal bias circuitry and high-side gate driver. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network; simplifies design for 1.285–5 V outputs with ceramic capacitors. |
| Integrated bootstrap diode | Removes need for external bootstrap diode; reduces BOM count and layout complexity in buck converter designs. |
| Adjustable soft-start | Prevents inrush current and output overshoot via user-selected capacitor on SS pin (100 nF–1 µF typical). |
| Precision enable with UVLO | Enables reliable power sequencing and prevents operation below 4.3 V input (rising UVLO threshold). |
| Thermal shutdown & current limit | Protects against sustained overloads and PCB overheating; latches off until reset by cycling EN or VIN. |
Applications
| Industrial Control Power Supply | Telecom Datacom Board Rail |
|---|---|
|
Use Scenario: Converting 24 V backplane supply to 3.3 V for PLC I/O modules and fieldbus interfaces. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering regulated 3.3 V at up to 500 mA with tight line/load regulation. Use Value: Wide 4.5–42 V input accommodates brownout and surge conditions common in factory environments; 500 kHz switching enables compact 2.2 µH inductor and 10 µF ceramic output cap. |
Use Scenario: Generating 1.8 V core voltage for Ethernet PHYs and packet processors on telecom line cards. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured with FB divider to deliver precise 1.8 V from 12 V intermediate rail. Use Value: ±1.5% reference accuracy ensures compliance with tight core voltage tolerances; soft-start prevents bus droop during hot-swap events. |
| Embedded System Point-of-Load | Automotive Body Control Module |
|
Use Scenario: Providing 5 V USB peripheral power and 1.2 V FPGA I/O rail from a shared 12 V battery-derived input. IC Role / Device Role / Timing Role: Dual-rail generation using two LM22671MRX-ADJ/NOPB devices, one per output, with synchronized switching to reduce EMI. Use Value: RT/SYNC pin enables inter-device synchronization, minimizing beat frequencies and easing EMI filter design on shared input bus. |
Use Scenario: Regulating 5 V for microcontroller and CAN transceiver in body control units powered from vehicle battery (9–16 V nominal, up to 42 V load dump). IC Role / Device Role / Timing Role: High-input-voltage buck regulator with built-in UVLO and thermal protection for under-hood deployment. Use Value: 42 V absolute max rating and –40°C to 125°C junction range meet automotive environmental requirements; EN pin supports controlled wake-up from sleep mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670MRX-ADJ/NOPB | Lower 3 V min input, 40 V max input, 300 mA output current, same package and pinout. | Suitable for lower-voltage systems (e.g., 5 V input rails); not rated for 42 V transients or 500 mA loads. | Choose when input stays below 40 V and load current ≤300 mA; offers cost reduction where full LM22671 capability is unused. |
| TPS54302DDAR | 3.5–28 V input, 3 A output, 500 kHz fixed frequency, no RT/SYNC sync capability, different pinout. | Higher current capacity for demanding loads; lacks frequency synchronization and adjustable soft-start. | Choose when ≥3 A output is required and synchronization is unnecessary; requires PCB redesign due to different pin assignment and package (SOIC-8). |
Compared with LM22671MRX-ADJ/NOPB, LM22670MRX-ADJ/NOPB trades input voltage headroom and output current for lower cost in less demanding applications, while TPS54302DDAR provides higher current but sacrifices frequency flexibility and pin compatibility - making LM22671MRX-ADJ/NOPB optimal for 42 V, 500 mA, sync-capable industrial point-of-load designs.
Availability
LM22671MRX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom datacom, and embedded system power supply designs requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for LM22671MRX-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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability power conversion ICs.
The LM22671MRX-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use in industrial and automotive DC/DC applications, emphasizing minimal external components, WEBENCH® design integration, and robust operation across harsh voltage and temperature ranges.
FAQ
What is the minimum output voltage achievable with LM22671MRX-ADJ/NOPB?
The LM22671MRX-ADJ/NOPB has a 1.285 V (typ) internal feedback reference voltage with ±1.5% accuracy over temperature. This sets the lowest possible output voltage when the FB pin is directly connected to VOUT. For outputs below 1.285 V, external circuitry such as an op-amp-based tracking scheme would be required - but LM22671MRX-ADJ/NOPB itself does not support sub-reference regulation.
Can LM22671MRX-ADJ/NOPB synchronize to an external clock?
Yes, LM22671MRX-ADJ/NOPB supports external synchronization via its RT/SYNC pin. When an external clock signal (1.75 V threshold, 1 MHz max) is applied during startup, the device enters sync mode and locks to the rising edge of that clock. Note that sync mode and resistor-based frequency adjustment are mutually exclusive - only one can be active at a time.
How is thermal performance managed in LM22671MRX-ADJ/NOPB?
LM22671MRX-ADJ/NOPB uses an HSOP-8 package with an exposed thermal pad (EP) that must be soldered to a PCB copper pour tied to GND. With proper layout, its junction-to-ambient thermal resistance is 60°C/W. The device also includes thermal shutdown at 150°C and automatically resumes operation after cooling - a critical safeguard in enclosed industrial enclosures where LM22671MRX-ADJ/NOPB may operate continuously near its 500 mA limit.
Does LM22671MRX-ADJ/NOPB require an external bootstrap diode?
No, LM22671MRX-ADJ/NOPB integrates a bootstrap diode internally. Only a 10 nF ceramic capacitor between BOOT and SW pins is required to complete the high-side gate drive circuit. This eliminates one discrete component, reduces board area, and improves reliability compared to controllers requiring external bootstrap diodes - a key simplification enabled by the LM22671MRX-ADJ/NOPB architecture.
What is the purpose of the SS pin on LM22671MRX-ADJ/NOPB?
The SS (soft-start) pin on LM22671MRX-ADJ/NOPB controls the output voltage ramp rate during startup. An internal 500 µA current source charges an external capacitor connected to SS, delaying FB loop engagement and preventing inrush current and output overshoot. Typical values range from 100 nF to 1 µF, allowing designers to tailor startup behavior for sensitive downstream loads - a feature fully implemented within LM22671MRX-ADJ/NOPB without additional ICs.
LM22671MRX-ADJ/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:
- 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
LM22671MRX-ADJ/NOPB FAQ
1.How can I place an order for LM22671MRX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22671MRX-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 LM22671MRX-ADJ/NOPB reliable?
The price and inventory of LM22671MRX-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 LM22671MRX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22671MRX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22671MRX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22671MRX-ADJ/NOPB?
LM22671MRX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22671MRX-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 LM22671MRX-ADJ/NOPB?
For technical support, including LM22671MRX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22671MRX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22671MRX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22671MRX-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 LM22671MRX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22671MRX-ADJ/NOPB?
All LM22671MRX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22671MRX-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 LM22671MRX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22671MRX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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