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Texas Instruments LM22671QMRE-ADJ/NOPB
- Part No.:
- LM22671QMRE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22671QMRE-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:496
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Product details
Overview
LM22671QMRE-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 output as low as 1.285 V via external feedback divider, and operates at a default 500 kHz switching frequency with ±1.5% reference accuracy - used in industrial power rails converting 24 V or 12 V to point-of-load 3.3 V or 1.8 V supplies.
For engineers reviewing the LM22671QMRE-ADJ/NOPB datasheet, LM22671QMRE-ADJ/NOPB pinout, LM22671QMRE-ADJ/NOPB application, or LM22671QMRE-ADJ/NOPB equivalent, key selection criteria include its internally compensated voltage-mode control, precision enable threshold (1.6 V typ), adjustable soft-start via external capacitor, integrated bootstrap diode, and thermal shutdown protection - all validated for operation from –40°C to +125°C junction temperature.
Technical Context
The LM22671QMRE-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feed-forward to stabilize loop gain across wide VIN ranges. Its internal Type III compensation network is optimized for outputs ≤5 V, enabling stable regulation without external compensation components when paired with standard ceramic output capacitors and low-ESR inductors.
It features a precision enable input with 0.6 V hysteresis and 6 µA internal pull-up, allowing reliable power sequencing; a dedicated RT/SYNC pin supporting three modes - internal 500 kHz oscillator, resistor-adjustable 200–1000 kHz, or external synchronization - and a BOOT/SW bootstrap circuit requiring a 10 nF ceramic capacitor for high-side gate drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to unregulated 24 V/12 V industrial rails without pre-regulation. |
| Output Current | 500 mA - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Feedback Reference | 1.285 V (typ), ±1.5% - enables precise adjustable output down to 1.285 V using two external resistors. |
| Switching Frequency | 500 kHz (default), adjustable 200–1000 kHz - balances efficiency, transient response, and external component size. |
| MOSFET RDS(ON) | 200 mΩ (typ) - reduces conduction loss and improves full-load efficiency (>90% typical). |
| Junction Temp Range | –40°C to +125°C - qualified for industrial and automotive under-hood environments. |
| Quiescent Current | 3.4 mA (typ) - minimizes no-load power draw in always-on subsystems. |
Pinout & Package
LM22671QMRE-ADJ/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 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 precision enable with 1.6 V turn-on threshold and 0.6 V hysteresis; 6 µA internal pull-up allows direct tie to VIN via resistor. |
| SW | Switch node output | Drives external inductor; swings from ~0 V to VIN; connects to cathode of external Schottky diode or low-side FET in synchronous designs. |
| FB | Feedback input | Connects to resistor divider from VOUT; regulates output by comparing against 1.285 V internal reference. |
| GND | System ground | Power and signal return; tied directly to exposed thermal pad for optimal thermal performance. |
| RT/SYNC | Oscillator control | Selects operating mode: floating = 500 kHz internal clock; resistor-to-GND = adjustable frequency; external clock = synchronization. |
| SS | Soft-start timing | Controls startup ramp rate via external capacitor; default internal soft-start 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 capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control | Eliminates need for external compensation network - simplifies design and reduces BOM count for 3.3 V/2.5 V/1.8 V outputs. |
| Stable with ceramic capacitors | Supports low-ESR ceramic output caps (e.g., 22 µF X5R) - avoids bulkier, less reliable electrolytics and lowers profile. |
| Adjustable switching frequency | 200–1000 kHz range via single RT/SYNC resistor - enables EMI optimization and inductor size reduction without redesign. |
| Integrated bootstrap diode | Removes need for external bootstrap diode - reduces layout complexity and failure points in high-reliability applications. |
| Precision enable with UVLO | EN pin doubles as programmable under-voltage lockout - prevents brown-out operation during battery discharge or rail sag. |
Applications
| Industrial Control | Telecom/Datacom Systems |
|---|---|
Use Scenario: Powering PLC I/O modules and fieldbus transceivers from 24 V DC rails in factory automation cabinets. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 3.3 V or 5 V to isolated RS-485 PHYs and microcontroller peripherals. Use Value: Wide 4.5–42 V input range accommodates 24 V rail tolerances and transient surges; thermal shutdown protects during enclosure overheating. | Use Scenario: Generating intermediate 5 V or 3.3 V rails from 48 V backplane in telecom line cards and optical modules. IC Role / Device Role / Timing Role: Point-of-load converter supplying FPGA configuration banks and SerDes analog supplies. Use Value: 500 kHz switching enables compact 2.2 µH inductors and 22 µF ceramic caps; SYNC capability aligns switching to system clock to reduce beat frequencies. |
| Embedded Systems | Conversions from Standard Rails |
Use Scenario: Powering ARM Cortex-M based edge nodes in IIoT gateways with constrained board space and thermal envelope. IC Role / Device Role / Timing Role: Main DC/DC regulator feeding MCU core, memory, and wireless SoC (e.g., Wi-Fi/BLE) subsystems. Use Value: Adjustable soft-start (via SS pin) prevents inrush current tripping upstream fuses; EN pin enables coordinated power-up sequencing with sensor ASICs. | Use Scenario: Down-converting legacy 12 V or 5 V wall adapters to modern low-voltage logic rails (1.8 V, 1.2 V) in consumer electronics. IC Role / Device Role / Timing Role: Secondary regulator providing clean, regulated supply for USB-C PD controllers or display timing ICs. Use Value: ±1.5% FB reference ensures tight output tolerance critical for DDR memory termination and ADC reference stability. |
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-ADJ/NOPB | Same pinout and function but rated for 40 V max input (vs. 42 V); slightly lower RDS(ON) (180 mΩ). | Not qualified for 42 V transients common in 24 V industrial systems; limited to ≤40 V steady-state inputs. | Choose only if input never exceeds 40 V and higher efficiency at light load is prioritized. |
| TPS54302DDCR | 36 V max input, 3 A output, 2.5 V to 6 V VIN min; requires external compensation; no integrated bootstrap diode. | Higher current capacity but larger solution size; lacks integrated boot diode and precision EN, increasing BOM and layout complexity. | Prefer when >500 mA load current is required and design can accommodate external compensation and discrete bootstrap. |
Compared with LM22671QMRE-ADJ/NOPB, LM22670MRE-ADJ/NOPB offers marginally better conduction loss but sacrifices 2 V input headroom critical for surge immunity, while TPS54302DDCR trades integration and ease-of-use for higher output current - making LM22671QMRE-ADJ/NOPB optimal for compact, robust 500 mA industrial point-of-load designs.
Availability
LM22671QMRE-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom/datacom power management, and embedded system point-of-load conversion requiring stable component supply, long-term lifecycle support, and AEC-Q100–compatible reliability.
Supply support for LM22671QMRE-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 over 90 years of innovation in industrial, automotive, and communications markets.
The LM22671QMRE-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - designed specifically for engineers needing fast, reliable, and minimal-component DC/DC solutions for harsh-environment power conversion without complex compensation or layout tuning.
FAQ
What is the minimum output voltage achievable with LM22671QMRE-ADJ/NOPB?
The LM22671QMRE-ADJ/NOPB has a fixed internal feedback reference voltage of 1.285 V (typ), ±1.5% over temperature. Therefore, the minimum regulated output voltage is 1.285 V - achieved when the FB pin is connected directly to VOUT (i.e., no resistor divider). This makes LM22671QMRE-ADJ/NOPB suitable for powering 1.3 V or 1.5 V logic rails where precision and low dropout are essential.
Does LM22671QMRE-ADJ/NOPB require an external bootstrap diode?
No, LM22671QMRE-ADJ/NOPB integrates a bootstrap diode internally. A 10 nF ceramic capacitor must still be placed between the BOOT and SW pins to provide gate drive voltage for the high-side MOSFET, but no external diode is needed - reducing component count, PCB area, and potential failure points compared to discrete bootstrap solutions.
Can LM22671QMRE-ADJ/NOPB synchronize to an external clock?
Yes, LM22671QMRE-ADJ/NOPB supports external synchronization via the RT/SYNC pin. When a valid 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. This feature helps eliminate beat frequencies in multi-rail systems and simplifies EMI filtering by aligning switching edges across multiple regulators.
What thermal performance can be expected from LM22671QMRE-ADJ/NOPB in HSOP-8 PowerPAD package?
LM22671QMRE-ADJ/NOPB in the HSOP-8 PowerPAD package has a junction-to-ambient thermal resistance (RθJA) of 60°C/W under standard JEDEC test conditions. With proper PCB layout - including a minimum 100 mm² copper pour connected to the exposed pad - it sustains 500 mA continuous output at 12 VIN/3.3 VOUT up to +85°C ambient without thermal shutdown, leveraging the exposed pad for efficient heat dissipation.
Is LM22671QMRE-ADJ/NOPB qualified for automotive applications?
No - LM22671QMRE-ADJ/NOPB is the commercial-grade variant. For automotive use, TI offers the LM22671-Q1 (e.g., LM22671QMR-ADJ/NOPB), which is AEC-Q100 Grade 1 qualified (–40°C to +125°C) and manufactured under automotive-specific process controls. LM22671QMRE-ADJ/NOPB is intended for industrial, telecom, and general embedded applications where automotive qualification is not required.
LM22671QMRE-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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM22671QMRE-ADJ/NOPB FAQ
1.How can I place an order for LM22671QMRE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22671QMRE-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 LM22671QMRE-ADJ/NOPB reliable?
The price and inventory of LM22671QMRE-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 LM22671QMRE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22671QMRE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22671QMRE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22671QMRE-ADJ/NOPB?
LM22671QMRE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22671QMRE-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 LM22671QMRE-ADJ/NOPB?
For technical support, including LM22671QMRE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22671QMRE-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22671QMRE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22671QMRE-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 LM22671QMRE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22671QMRE-ADJ/NOPB?
All LM22671QMRE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22671QMRE-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 LM22671QMRE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22671QMRE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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