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Texas Instruments LM22674MRE-ADJ/NOPB
- Part No.:
- LM22674MRE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22674MRE-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:900
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Product details
Overview
LM22674MRE-ADJ/NOPB from Texas Instruments is a 42 V, 500 mA adjustable-output synchronous step-down 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 input voltages from 4.5 V to 42 V - ideal for industrial power conversion from 12 V or 24 V rails.
For engineers reviewing the LM22674MRE-ADJ/NOPB datasheet, LM22674MRE-ADJ/NOPB pinout, LM22674MRE-ADJ/NOPB application, or LM22674MRE-ADJ/NOPB equivalent, key selection criteria include its internally compensated voltage-mode control, integrated bootstrap diode, precision enable threshold (1.6 V typ), soft-start timing (500 µs), and thermal shutdown at 150°C - all critical for robust, low-component-count buck designs in harsh environments.
Technical Context
The LM22674MRE-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain across wide VIN ranges. Its internal Type III compensation network is optimized for output voltages ≤5 V, enabling stable operation with low-ESR ceramic capacitors without external compensation components.
It features a dedicated BOOT pin driving the high-side MOSFET gate via an external 10 nF capacitor, a precision EN pin with 0.6 V hysteresis and 6 µA pullup, and current-limit protection (0.7 A typ) that transitions into foldback mode under severe overload - all coordinated within a single monolithic IC with exposed thermal pad (EP) tied to GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct regulation from unregulated 12 V, 24 V, or 36 V industrial rails without pre-regulation. |
| Output Current | 500 mA max - sufficient for powering microcontrollers, sensors, and analog circuitry in embedded systems. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; enables precise VOUT ≥1.285 V using external resistor divider. |
| Switching Frequency | 500 kHz - allows compact 3.9 mm × 4.89 mm layout with small inductors (e.g., 3.3–10 µH) and ceramic output caps. |
| RDS(ON) | 200 mΩ - reduces conduction loss at full load; enables >90% efficiency at mid-load with proper component selection. |
| Quiescent Current | 3.4 mA (active), 25 µA (shutdown) - minimizes standby power in battery-backed or always-on systems. |
| Junction Temp Range | –40°C to +125°C - qualified for industrial and automotive-grade operation without derating in most PCB layouts. |
Pinout & Package
LM22674MRE-ADJ/NOPB uses the HSOP-8 PowerPAD (DDA) package (4.89 mm × 3.90 mm) with exposed thermal pad (EP) 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 cap between BOOT and SW to generate 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; pulls up internally at 6 µA - enables simple sequencing or external UVLO. |
| SW | Switch node | Drives external Schottky diode and output inductor; swings from ~0 V to VIN; requires tight layout to minimize EMI and ringing. |
| FB | Feedback sensing input | High-impedance (230 nA bias) node monitoring output via resistor divider; must be routed away from noise sources and placed near output cap. |
| GND | Power and signal ground | Common return for power path and control circuitry; connects directly to EP for optimal thermal and electrical performance. |
| VIN | Main input supply | Accepts 4.5–42 V; requires local 10 µF ceramic input capacitor close to VIN and GND pins to suppress ripple and transients. |
| NC | No-connect terminals | Pins 2 and 3 are electrically isolated but serve as thermal conduction paths - leave unconnected or tie to GND for added thermal relief. |
| EP | Exposed thermal pad | Mandatory GND connection via multiple thermal vias to inner ground plane; primary path for heat removal in high-power operation. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control | Eliminates need for external compensation network - simplifies design and improves consistency across production units. |
| Integrated bootstrap diode | Removes requirement for external bootstrap diode - reduces BOM count and layout complexity in high-side gate drive path. |
| Fixed 500 kHz switching | Enables predictable EMI filtering and consistent transient response; avoids audible noise and simplifies output filter design. |
| Soft-start (500 µs) | Prevents inrush current and output overshoot during power-up - protects downstream circuitry without external timing components. |
| Thermal shutdown (150°C) | Automatically disables switching when junction exceeds safe limit - prevents permanent damage during overload or poor heatsinking. |
| WEBENCH® enabled | Supports full online design flow including component selection, efficiency simulation, thermal modeling, and PCB layout export. |
Applications
| Industrial Control Power | Telecom Line Card Supply |
|---|---|
Use Scenario: Providing regulated 3.3 V or 5 V from 24 V backplane in PLC I/O modules or motor drives. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering clean, efficient, and thermally robust local power. Use Value: Enables compact, fanless designs with <125°C junction operation even at full 500 mA load and 42 V input. | Use Scenario: Generating auxiliary 12 V or adjustable bias from –48 V telecom rectified bus (via intermediate 24 V stage). IC Role / Device Role / Timing Role: Secondary step-down regulator handling line-card logic, interface ICs, and sensor front-ends. Use Value: Delivers stable output despite wide input variation and maintains regulation during hot-swap transients due to fast 500 kHz response. |
| Embedded System Core Rail | Automotive Body Control Module |
Use Scenario: Powering ARM Cortex-M or RISC-V SoCs and peripherals in edge gateways or IoT controllers. IC Role / Device Role / Timing Role: Main system regulator with precision enable sequencing and soft-start synchronized to MCU reset. Use Value: Ensures reliable boot-up with no output overshoot and meets ±1.5% VREF accuracy over –40°C to +125°C. | Use Scenario: Supplying 5 V or 3.3 V to microcontrollers and CAN transceivers in BCMs operating from 12 V battery (9–16 V nominal, up to 42 V load dump). IC Role / Device Role / Timing Role: High-voltage tolerant buck regulator with built-in UVLO and thermal protection for automotive safety-critical subsystems. Use Value: Survives 42 V load-dump pulses and maintains regulation down to 4.5 V cold-crank - eliminating need for external TVS or pre-regulator. |
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 |
|---|---|---|---|
| LM22670MRE-ADJ/NOPB | Same pinout, 150 kHz switching, higher RDS(ON) (330 mΩ), lower IQ (2.5 mA), wider min. on-time limits max. VIN:VOUT ratio. | Better suited for ultra-low-noise, high-efficiency low-frequency designs where size is less constrained. | Select when EMI filtering priority outweighs board space; avoid if 500 kHz transient response or 42 V input headroom is required. |
| TPS54302DDCR | 3.5–28 V input, 3 A output, 500 kHz, integrated high-/low-side FETs, no BOOT pin, different pinout (SOT-23-6). | Higher current capability and smaller footprint, but lacks 42 V rating and exposed thermal pad for high-power dissipation. | Choose for cost-sensitive, space-constrained 24 V systems needing >500 mA; not suitable for 36–42 V industrial inputs or thermal-heavy applications. |
Compared with LM22670MRE-ADJ/NOPB, LM22674MRE-ADJ/NOPB offers faster transient response and higher input voltage tolerance; versus TPS54302DDCR, it provides superior thermal management and 42 V ruggedness at the cost of lower output current - making it the preferred choice for industrial and automotive buck conversion where reliability trumps raw current density.
Availability
LM22674MRE-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power, and automotive body electronics requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned quality assurance.
Supply support for LM22674MRE-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 DC/DC conversion.
The LM22674 series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use, minimal external component count, and robust operation in industrial, automotive, and telecom power applications.
FAQ
What is the minimum output voltage achievable with LM22674MRE-ADJ/NOPB?
The LM22674MRE-ADJ/NOPB has a feedback reference voltage of 1.285 V (±1.5%) - this is the lowest output voltage it can regulate. To achieve this, connect the FB pin directly to VOUT (i.e., RFBB = 0 Ω, RFBT open). Any lower output would violate the internal error amplifier's operating range and cause regulation failure. The LM22674MRE-ADJ/NOPB datasheet confirms this value across –40°C to +125°C.
Does LM22674MRE-ADJ/NOPB require an external bootstrap diode?
No, LM22674MRE-ADJ/NOPB integrates a bootstrap diode internally - only an external 10 nF ceramic capacitor between BOOT and SW is required. This eliminates one discrete component, reduces layout sensitivity, and improves reliability compared to controllers requiring external bootstrap diodes. The LM22674MRE-ADJ/NOPB functional block diagram and feature list explicitly state "Integrated Boot-Strap Diode" as a key differentiator.
Can LM22674MRE-ADJ/NOPB operate with ceramic output capacitors only?
Yes, LM22674MRE-ADJ/NOPB is explicitly characterized and stabilized for use with low-ESR ceramic output capacitors - no electrolytic or tantalum capacitors are needed. Its internal Type III compensation and voltage-mode architecture ensure stability with typical 10–47 µF X5R/X7R ceramics. The LM22674MRE-ADJ/NOPB datasheet states "Stable with Low ESR Ceramic Capacitors" as a headline feature and validates this in the Typical Application schematic.
What is the purpose of the NC pins (2 and 3) on LM22674MRE-ADJ/NOPB?
Pins 2 and 3 on LM22674MRE-ADJ/NOPB are designated No-Connect (NC) - they are not electrically bonded to the die but function as thermal conduction paths from the package mold compound to the PCB. TI recommends leaving them unconnected or tying them to GND to improve thermal transfer. The LM22674MRE-ADJ/NOPB Pin Functions table confirms these pins are "Not Connected" and notes their role in thermal conduction.
How does the enable pin (EN) behave during input undervoltage conditions?
The LM22674MRE-ADJ/NOPB EN pin has a precision threshold of 1.6 V (typ) with 0.6 V hysteresis, but it does not directly monitor VIN. Instead, the device includes a separate internal UVLO circuit (rising threshold 4.3 V, falling 3.9 V) that forces shutdown regardless of EN state if VIN drops below ~3.9 V. For tighter UVLO control, the EN pin can be driven by a resistor divider from VIN - allowing programmable turn-on/off thresholds independent of the internal UVLO. This dual-protection behavior is documented in the LM22674MRE-ADJ/NOPB Feature Description section.
LM22674MRE-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
LM22674MRE-ADJ/NOPB FAQ
1.How can I place an order for LM22674MRE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22674MRE-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 LM22674MRE-ADJ/NOPB reliable?
The price and inventory of LM22674MRE-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 LM22674MRE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22674MRE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22674MRE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22674MRE-ADJ/NOPB?
LM22674MRE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22674MRE-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 LM22674MRE-ADJ/NOPB?
For technical support, including LM22674MRE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22674MRE-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22674MRE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22674MRE-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 LM22674MRE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22674MRE-ADJ/NOPB?
All LM22674MRE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22674MRE-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 LM22674MRE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22674MRE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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