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Texas Instruments LM22674QMRX-ADJ/NOPB
- Part No.:
- LM22674QMRX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22674QMRX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:4,155
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Product details
Overview
LM22674QMRX-ADJ/NOPB from Texas Instruments is a 42 V input, 500 mA adjustable-output synchronous buck DC-DC regulator in an HSOP-8 PowerPAD package. It integrates a 200 mΩ N-channel MOSFET switch, operates at 500 kHz fixed frequency, delivers ±1.5% feedback reference accuracy (1.285 V), and supports industrial temperature range (–40°C to 125°C). It is used in point-of-load conversion for telecom power supplies and embedded systems requiring stable low-noise 3.3 V or 5 V rails.
For engineers reviewing the LM22674QMRX-ADJ/NOPB datasheet, LM22674QMRX-ADJ/NOPB pinout, LM22674QMRX-ADJ/NOPB application, or LM22674QMRX-ADJ/NOPB equivalent, this page provides verified pin functions, thermal design guidance, soft-start timing (500 µs), enable threshold (1.6 V typ), and real-world stability constraints for ceramic-capacitor-based designs.
Technical Context
The LM22674QMRX-ADJ/NOPB implements voltage-mode PWM control with input voltage feedforward to stabilize loop gain across wide VIN ranges (4.5 V to 42 V). Its internal Type III compensation network is optimized for output voltages ≤5 V, enabling stable operation with low-ESR ceramic output capacitors without external compensation components.
It features integrated bootstrap diode, precision enable input with 0.6 V hysteresis, and thermal shutdown at 150°C. Minimum on-time (100 ns) and off-time (200 ns) constrain duty-cycle limits, directly impacting maximum achievable step-down ratio and minimum input voltage before dropout under full load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to 24 V industrial rails and 36 V automotive battery transients. |
| Output Current | 500 mA - sufficient for powering microcontrollers, FPGAs, and analog signal chains in space-constrained designs. |
| Switching Frequency | 500 kHz - enables use of compact 3.3 µH–10 µH inductors and reduces output ripple without compromising transient response. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; combined with external resistor divider, supports 1.285 V to >42 V outputs. |
| RDS(ON) | 0.24 Ω (max) - limits conduction loss at 500 mA, contributing to >90% peak efficiency in typical 12 V → 3.3 V designs. |
| Quiescent Current | 3.4 mA (typ) - ensures low no-load power draw in always-on subsystems such as sensor interfaces. |
| Soft-Start Time | 500 µs (typ) - prevents inrush current during power-up, eliminating need for external soft-start circuitry. |
Pinout & Package
LM22674QMRX-ADJ/NOPB uses the HSOP-8 PowerPAD (DDA) package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground plane for enhanced thermal dissipation (RθJA = 60°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply node | Connects external 10 nF ceramic capacitor to SW; supplies gate drive voltage for internal high-side MOSFET. |
| EN | Enable control input | Logic-compatible input with 1.6 V turn-on threshold and 0.6 V hysteresis; draws only 6 µA when active. |
| SW | Switch node | Drives external inductor; swings from GND to VIN; requires low-inductance layout to minimize EMI and switching losses. |
| FB | Feedback sensing input | High-impedance (230 nA bias) node monitoring output via resistor divider; placement near output capacitor critical for noise immunity. |
| GND | Power and signal ground | Common return for power stage and control circuitry; must be tied to exposed pad for thermal and electrical integrity. |
| VIN | Main power input | Accepts 4.5–42 V; requires local 10 µF ceramic input capacitor placed within 5 mm of VIN and GND pins. |
| NC (Pins 2,3) | No-connect terminals | Thermally conductive but electrically isolated; may be left unconnected or grounded for mechanical stability. |
| EP (Exposed Pad) | Thermal & ground interface | Mandatory solder connection to large PCB copper area tied to system GND; primary path for heat removal. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network; simplifies design for 1.285 V–5 V outputs while maintaining phase margin >45°. |
| Integrated bootstrap diode | Removes requirement for external bootstrap diode, reducing BOM count and PCB footprint in high-side gate drive path. |
| Stable with ceramic output capacitors | Supports low-ESR, high-frequency ceramic caps (e.g., 22 µF X5R) - avoids bulk electrolytics and improves long-term reliability. |
| Precision enable with UVLO override | EN pin allows sequencing with other rails; also configurable as external undervoltage lockout (e.g., disable below 9 V) using resistor divider. |
| WEBENCH®-enabled design support | TI's online tool generates complete bill-of-materials, simulates efficiency/thermal performance, and exports layout-ready Gerber files. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
Use Scenario: Powering isolated CAN transceivers and analog sensor front-ends in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 3.3 V buck regulator delivering clean, regulated power from 24 V field bus with transient immunity up to 42 V. Use Value: Internal 500 kHz switching and ceramic-capacitor compatibility reduce board area by 35% vs legacy linear regulators, while ±1.5% reference ensures ADC reference stability. | Use Scenario: Generating 5 V rail for microcontroller, LIN transceiver, and LED drivers in door module electronics. IC Role / Device Role / Timing Role: Automotive-grade (AEC-Q100 Grade 1) step-down regulator handling cold-crank (4.5 V) and load-dump (42 V) conditions. Use Value: 125°C junction rating and thermal shutdown at 150°C ensure continuous operation in under-hood environments without derating. |
| Telecom Remote Radio Unit | Medical Point-of-Care Monitor |
Use Scenario: Converting -48 V telecom supply (via intermediate 12 V) to 3.3 V for FPGA configuration and Ethernet PHY. IC Role / Device Role / Timing Role: Secondary-stage buck converter accepting 12 V input, providing low-noise 3.3 V at 500 mA with fast line/load transient response. Use Value: 500 kHz fixed frequency enables predictable EMI filtering; soft-start prevents brownout during hot-swap insertion into live backplane. | Use Scenario: Supplying 1.8 V and 3.3 V rails for ARM Cortex-M based patient interface and sensor acquisition subsystems. IC Role / Device Role / Timing Role: Adjustable-output buck regulator configured for 1.8 V using precision FB divider; supports low-power sleep modes. Use Value: 25 µA shutdown current extends battery life in portable monitors; ±1.5% reference accuracy maintains clinical-grade measurement repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670QMRX-ADJ/NOPB | Same pinout, 300 kHz switching frequency, higher RDS(ON) (0.32 Ω), lower max input (36 V). | Better suited for cost-sensitive, lower-frequency designs where EMI filtering is less constrained. | Select when 300 kHz operation suffices and input voltage never exceeds 36 V. |
| TPS54302DDAR | 3.5 V–28 V input, 3 A output, 500 kHz, integrated high-/low-side MOSFETs, no BOOT pin required. | Higher current capability and wider VIN range than LM22674QMRX-ADJ/NOPB but requires external compensation. | Choose for 3 A loads or when needing higher integration beyond 500 mA; not drop-in compatible due to different pinout and control architecture. |
Compared with LM22674QMRX-ADJ/NOPB, the LM22670QMRX-ADJ/NOPB trades switching speed and input voltage headroom for lower cost, while the TPS54302DDAR offers higher current and integrated dual-FET topology at the expense of added design complexity and non-pin-compatibility.
Availability
LM22674QMRX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, automotive body electronics, and telecom remote radio units requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM22674QMRX-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 history.
The LM22674QMRX-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family-designed for ease-of-use in high-voltage DC-DC conversion with minimal external components and robust thermal performance.
FAQ
What is the minimum output voltage supported by the LM22674QMRX-ADJ/NOPB?
The LM22674QMRX-ADJ/NOPB supports a minimum output voltage equal to its internal feedback reference voltage of 1.285 V (typical), with ±1.5% accuracy over –40°C to 125°C. This value is fixed by the bandgap reference and cannot be reduced further, even with external resistor scaling. Output voltages below 1.285 V require a different regulator architecture.
Does the LM22674QMRX-ADJ/NOPB require an external bootstrap diode?
No, the LM22674QMRX-ADJ/NOPB integrates a bootstrap diode internally. Only an external 10 nF ceramic capacitor between BOOT and SW pins is required to form the floating gate-drive supply. Adding an external diode is unnecessary and may interfere with proper boot capacitor charging.
Can the LM22674QMRX-ADJ/NOPB operate with 100% duty cycle?
No, the LM22674QMRX-ADJ/NOPB has a minimum off-time specification of 200 ns (typ), preventing true 100% duty cycle operation. This limitation ensures reliable recharging of the bootstrap capacitor each switching cycle. As a result, the device cannot maintain regulation if VOUT ≥ VIN – (ILOAD × RDS(ON)), and dropout occurs below ~4.5 V input for low-VOUT configurations.
What is the purpose of the NC pins (2 and 3) on the LM22674QMRX-ADJ/NOPB?
Pins 2 and 3 of the LM22674QMRX-ADJ/NOPB are no-connect (NC) terminals - they are not electrically bonded to the die but serve as thermal conduction paths from the package mold compound to the PCB. They may be left floating or connected to GND for improved mechanical anchoring and thermal spreading, but must never be routed to active signals.
How does the LM22674QMRX-ADJ/NOPB handle short-circuit conditions?
Under short-circuit, the LM22674QMRX-ADJ/NOPB enters low-frequency current foldback mode (~100 kHz) after tripping its 0.7 A (typ) peak current limit. This reduces power dissipation and prevents thermal runaway. Recovery requires reducing load current significantly below the foldback threshold - hysteresis ensures stable re-entry into normal PWM mode once fault clears.
LM22674QMRX-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:
- Obsolete
- 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
LM22674QMRX-ADJ/NOPB FAQ
1.How can I place an order for LM22674QMRX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22674QMRX-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 LM22674QMRX-ADJ/NOPB reliable?
The price and inventory of LM22674QMRX-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 LM22674QMRX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22674QMRX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22674QMRX-ADJ/NOPB transactions.
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4.How is shipping managed for LM22674QMRX-ADJ/NOPB?
LM22674QMRX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22674QMRX-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 LM22674QMRX-ADJ/NOPB?
For technical support, including LM22674QMRX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22674QMRX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22674QMRX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22674QMRX-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 LM22674QMRX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22674QMRX-ADJ/NOPB?
All LM22674QMRX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22674QMRX-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 LM22674QMRX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22674QMRX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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