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Texas Instruments LM22671QMR-ADJ/NOPB
- Part No.:
- LM22671QMR-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22671QMR-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,938
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Product details
Overview
LM22671QMR-ADJ/NOPB from Texas Instruments is a 42 V, 500 mA adjustable-output synchronous buck DC/DC regulator in an HSOP-8 PowerPAD package. It integrates a 200 mΩ N-channel MOSFET switch, supports input voltages from 4.5 V to 42 V, delivers ±1.5% feedback reference accuracy at 1.285 V, and operates at a default 500 kHz switching frequency for compact filter design in industrial power rails.
For engineers reviewing the LM22671QMR-ADJ/NOPB datasheet, LM22671QMR-ADJ/NOPB pinout, LM22671QMR-ADJ/NOPB application, or LM22671QMR-ADJ/NOPB equivalent, key selection considerations include its adjustable output down to 1.285 V, precision enable threshold (1.6 V typ), integrated bootstrap diode, thermal shutdown, and compatibility with low-ESR ceramic output capacitors in space-constrained 24 V/12 V conversion systems.
Technical Context
The LM22671QMR-ADJ/NOPB implements voltage-mode PWM control with input voltage feed-forward to stabilize loop gain across wide VIN ranges. Its internal Type III compensation is optimized for outputs ≤5 V, enabling stable operation without external compensation components when paired with standard inductor–capacitor combinations.
It features a precision enable pin with 0.6 V hysteresis and 6 µA internal pull-up, supporting controlled power sequencing and external UVLO implementation. The RT/SYNC pin enables three modes: internal 500 kHz oscillation, resistor-adjustable frequency (200–1000 kHz), or synchronization to an external clock >500 kHz - 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 direct regulation from unregulated 24 V, 12 V, or automotive battery rails without pre-regulation. |
| Output Current | 500 mA - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; enables precise VOUT tuning via external resistor divider. |
| Switch RDS(on) | 200 mΩ - reduces conduction loss and improves efficiency (>90% typical at mid-load) in high-current buck stages. |
| Switching Frequency | 500 kHz default - allows use of small 4.7 µH inductors and 10–22 µF ceramic output capacitors. |
| Quiescent Current | 3.4 mA - enables low-power standby operation while maintaining fast wake-up response. |
| Enable Threshold | 1.6 V (falling), 2.2 V (rising) - supports clean sequencing with simple resistor dividers from upstream supplies. |
Pinout & Package
LM22671QMR-ADJ/NOPB is housed in an HSOP-8 package with exposed thermal pad (PowerPAD™), measuring 4.89 mm × 3.90 mm. The exposed pad must be soldered to a PCB ground plane 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 on/off control with 0.6 V hysteresis; 6 µA internal pull-up enables floating-pin operation. |
| SW | Switch node output | Drives external inductor; swings from ~0 V to VIN; requires low-inductance layout to minimize EMI. |
| FB | Feedback input | Connects to resistor divider from VOUT; senses 1.285 V reference to regulate output voltage. |
| GND | System ground | Reference for all internal circuitry; connects to exposed pad for thermal dissipation. |
| RT/SYNC | Oscillator mode control | Selects internal 500 kHz, resistor-tuned (200–1000 kHz), or external sync mode - latched at startup. |
| SS | Soft-start timing | Controls ramp-up time via external capacitor; extends start-up to reduce inrush current and stress. |
| VIN | Input supply | Primary power input (4.5–42 V); bypassed with ≥10 µF ceramic capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network - simplifies design and reduces BOM count for 1.285–5 V outputs. |
| Integrated bootstrap diode | Removes requirement for external bootstrap diode - saves board space and improves reliability in high-duty-cycle applications. |
| Adjustable soft-start | Enables user-defined start-up time (via SS capacitor) to prevent output overshoot and limit inrush into large output capacitance. |
| Thermal shutdown & current limiting | Protects against sustained overloads and PCB overheating - shuts down at 150°C junction temperature and limits peak switch current to 0.7 A (typ). |
| Stable with low-ESR ceramics | Supports X5R/X7R MLCCs as output capacitors - avoids bulkier tantalum or electrolytic solutions and improves long-term reliability. |
Applications
| Industrial Control | Telecom/Datacom Systems |
|---|---|
Use Scenario: Regulating 24 V bus down to 3.3 V or 5 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable, low-noise power to microcontrollers and analog front-ends. Use Value: Wide 4.5–42 V input range accommodates brownout and surge conditions common in factory-floor wiring; 500 mA output sustains multiple peripheral loads. | Use Scenario: Point-of-load conversion in telecom line cards powered from –48 V or +24 V intermediate rails. IC Role / Device Role / Timing Role: Secondary buck converter generating isolated logic supply (e.g., 1.8 V, 3.3 V) from distributed DC bus. Use Value: 500 kHz fixed frequency avoids interference with data transmission bands; adjustable output supports diverse ASIC/FPGA core voltages. |
| Embedded Systems | Automotive Body Electronics |
Use Scenario: Powering ARM Cortex-M microcontrollers and CAN transceivers in portable test equipment. IC Role / Device Role / Timing Role: Main system regulator with sequenced enable and soft-start for deterministic boot behavior. Use Value: Precision EN pin (1.6 V threshold) enables reliable power-up coordination with host processor; SS pin ensures glitch-free initialization. | Use Scenario: Converting 12 V battery supply to 5 V for infotainment display controllers and lighting drivers. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 qualified buck regulator handling cold-crank (4.5 V) and load-dump (42 V) transients. Use Value: –40°C to +125°C operating range and automotive qualification ensure robustness in under-hood environments; integrated protection prevents field failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670QMR-ADJ/NOPB | Same pinout and function but rated for 45 V max input and 3 A output; larger thermal footprint. | Higher current capability suits motor driver bias rails or multi-rail systems where 500 mA is insufficient. | Select LM22670QMR-ADJ/NOPB only if >500 mA continuous load or >42 V transient tolerance is required. |
| TPS54302DDCR | 3.5–28 V input, 3 A output, 2.5 MHz switching; no integrated bootstrap diode; requires external compensation. | Better suited for ultra-compact designs needing higher frequency and current, but increases design complexity. | Choose TPS54302DDCR when board area is critical and 2.5 MHz operation justifies added compensation effort. |
Compared with LM22670QMR-ADJ/NOPB, the LM22671QMR-ADJ/NOPB offers tighter size and lower quiescent current for moderate loads; versus TPS54302DDCR, it trades higher frequency for simpler layout and built-in compensation - making it optimal for cost-sensitive, thermally constrained 500 mA applications.
Availability
LM22671QMR-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom/datacom systems, and embedded systems requiring stable component supply with automotive-grade reliability and long lifecycle support.
Supply support for LM22671QMR-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 designing analog and embedded processing chips for industrial, automotive, and communications markets.
The LM22671QMR-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use in non-isolated DC/DC buck conversion, emphasizing minimal external components, internal compensation, and robust operation across harsh input conditions.
FAQ
What is the minimum output voltage achievable with LM22671QMR-ADJ/NOPB?
The LM22671QMR-ADJ/NOPB has a nominal feedback reference voltage of 1.285 V, which sets the lowest possible regulated output voltage. When configured with a resistive divider on the FB pin, the output can be adjusted down to exactly this reference value - i.e., 1.285 V - provided the external resistors are selected to avoid excessive divider current and maintain accuracy within ±1.5% tolerance. This makes LM22671QMR-ADJ/NOPB suitable for powering low-voltage logic such as 1.3 V or 1.5 V rails with appropriate margin.
Does LM22671QMR-ADJ/NOPB require an external bootstrap diode?
No, LM22671QMR-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component between BOOT and VIN. This simplifies layout, reduces bill-of-materials count, and improves reliability in high-duty-cycle applications where external diodes may fail. Users must still place a 10 nF ceramic capacitor directly between BOOT and SW pins with short, low-inductance traces to ensure proper gate drive voltage generation for the internal high-side MOSFET.
Can LM22671QMR-ADJ/NOPB synchronize to an external clock?
Yes, LM22671QMR-ADJ/NOPB supports external clock synchronization via the RT/SYNC pin. When an external square-wave signal with amplitude meeting VSYNC specifications (1.75 V threshold, 3.5 V logic level) and frequency between 500 kHz and 1 MHz is applied, the device locks to the rising edge and operates synchronously. This feature helps reduce beat frequencies and EMI in multi-regulator systems. Note that synchronization disables current-limit foldback, so short-circuit protection behavior differs from free-running mode.
What thermal management is required for LM22671QMR-ADJ/NOPB at full 500 mA load?
At full 500 mA output and 12 V input, LM22671QMR-ADJ/NOPB dissipates approximately 0.5 W. With its HSOP-8 PowerPAD™ package and RθJA of 60°C/W, junction temperature rise above ambient is ~30°C - well within the –40°C to +125°C operating range. To ensure reliability, the exposed thermal pad must be soldered to a minimum 100 mm² copper pour connected to GND. Adding two thermal vias per mm² beneath the pad further lowers θJA and maintains safe junction temperatures under worst-case ambient conditions.
How does the enable pin (EN) function in LM22671QMR-ADJ/NOPB?
The EN pin of LM22671QMR-ADJ/NOPB provides precision on/off control with a 1.6 V falling threshold and 2.2 V rising threshold, plus 0.6 V hysteresis. It features a 6 µA internal pull-up, allowing direct connection to VIN through a resistor for automatic turn-on, or to a microcontroller GPIO for active sequencing. Pulling EN below 1.6 V disables the regulator, reducing quiescent current to 25 µA (typ). This behavior makes LM22671QMR-ADJ/NOPB ideal for systems requiring controlled power-up order or low-power sleep states.
LM22671QMR-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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM22671QMR-ADJ/NOPB FAQ
1.How can I place an order for LM22671QMR-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22671QMR-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 LM22671QMR-ADJ/NOPB reliable?
The price and inventory of LM22671QMR-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 LM22671QMR-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22671QMR-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22671QMR-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22671QMR-ADJ/NOPB?
LM22671QMR-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22671QMR-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 LM22671QMR-ADJ/NOPB?
For technical support, including LM22671QMR-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22671QMR-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22671QMR-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22671QMR-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 LM22671QMR-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22671QMR-ADJ/NOPB?
All LM22671QMR-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22671QMR-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 LM22671QMR-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22671QMR-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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