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Texas Instruments LM22674QMRE-ADJ/NOPB
- Part No.:
- LM22674QMRE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22674QMRE-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:346
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Product details
Overview
LM22674QMRE-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 down to 1.285 V output, and supports industrial temperature range (–40°C to 125°C). It is used in point-of-load conversion for telecom power supplies.
For engineers reviewing the LM22674QMRE-ADJ/NOPB datasheet, LM22674QMRE-ADJ/NOPB pinout, LM22674QMRE-ADJ/NOPB application, or LM22674QMRE-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 typ), and thermal shutdown at 150°C.
Technical Context
The LM22674QMRE-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain across wide VIN variations. 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 bootstrap capacitor, a precision EN pin with 0.6 V hysteresis and 6 µA internal pullup, and current-limit protection (0.56–0.84 A) combined with thermal shutdown (150°C trip, 135°C recovery) for robust overload handling.
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 systems. |
| Output Current | 500 mA max - 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 requiring large bulk capacitance. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; allows precise regulation of 1.8 V, 2.5 V, 3.3 V, and 5 V rails using external resistor divider. |
| RDS(ON) | 200 mΩ (typ) - minimizes conduction loss at full load, supporting >90% peak efficiency in typical 12 V → 3.3 V conversions. |
| Quiescent Current | 3.4 mA (typ) - ensures low no-load power draw in always-on subsystems; standby current drops to 25 µA in shutdown. |
| Operating Junction Temp | –40°C to 125°C - qualified for extended industrial and automotive under-hood environments without derating. |
Pinout & Package
LM22674QMRE-ADJ/NOPB uses an 8-pin HSOP package (4.89 mm × 3.90 mm) with exposed PowerPAD thermally connected 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; provides gate drive voltage for internal high-side MOSFET. |
| EN | Enable control input | Logic-level input with 1.6 V threshold and 0.6 V hysteresis; 6 µA internal pullup allows direct tie to VIN or resistor-divider sequencing. |
| 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 path for power stage and control circuitry; must be tied directly to exposed PowerPAD for thermal and electrical integrity. |
| VIN | Main power input | Accepts 4.5–42 V; requires local 10 µF ceramic input capacitor placed close to 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 pad | Mandatory connection to PCB ground plane via multiple thermal vias; primary path for heat removal from die. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control | Eliminates need for external compensation network-reduces BOM count and design iteration time for 1.285–5 V outputs. |
| Integrated bootstrap diode | Removes requirement for external bootstrap diode, simplifying layout and improving reliability in high-duty-cycle applications. |
| 500 µs soft-start | Prevents inrush current and output overshoot during power-up; fixed timing avoids external capacitor dependency. |
| Stable with ceramic output caps | Supports low-ESR MLCCs (e.g., 22 µF X5R) without oscillation-enables smaller footprint and lower cost vs. tantalum or electrolytic alternatives. |
| WEBENCH® enabled | Direct integration with TI's online design tool for automated component selection, efficiency simulation, thermal modeling, and PCB layout guidance. |
Applications
| Industrial PLC I/O Module | Telecom Remote Radio Unit |
|---|---|
Use Scenario: Regulating 24 V backplane to 3.3 V for FPGA configuration and sensor interface circuitry in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary point-of-load buck regulator delivering clean, regulated 3.3 V at up to 500 mA with tight line/load regulation. Use Value: Enables single-stage conversion from 24 V without intermediate 5 V rail, reducing component count and board area while maintaining <1% output deviation over full load and temperature range. | Use Scenario: Generating 5 V from 48 V telecom supply to power RF front-end ICs and clock buffers in outdoor small-cell base stations. IC Role / Device Role / Timing Role: High-input-voltage buck converter providing stable 5 V with fast transient response to handle burst-mode RF transmit loads. Use Value: 500 kHz switching frequency and internal compensation ensure minimal output voltage droop (<50 mV) during 100 mA–500 mA step load transients, preserving signal integrity. |
| Automotive Body Control Module | Embedded Medical Data Logger |
Use Scenario: Converting 12 V vehicle battery to 1.8 V for microcontroller core supply in junction box electronics operating across cold-crank (4.5 V) to load-dump (42 V) conditions. IC Role / Device Role / Timing Role: Automotive-grade (Q1 variant compatible) buck regulator with UVLO and thermal protection for safety-critical subsystems. Use Value: Wide 4.5–42 V input range and –40°C to 125°C operation eliminate need for pre-regulator stages, simplifying architecture and improving system-level MTBF. | Use Scenario: Powering low-noise analog front-end and SD card interface in portable patient-monitoring devices powered by Li-ion batteries (3.0–4.2 V) with backup 5 V USB input. IC Role / Device Role / Timing Role: Dual-input capable buck regulator configured for 3.3 V output with precision enable sequencing to manage sleep/wake transitions. Use Value: 25 µA shutdown current extends battery life; ±1.5% reference accuracy ensures consistent ADC reference voltage across battery discharge curve. |
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 | Lower 3 V min input, 300 kHz fSW, same 500 mA rating and HSOP-8 package. | Optimized for 3–42 V inputs (e.g., dual-supply systems); slower switching increases inductor size but improves light-load efficiency. | Select when input may dip below 4.5 V or when EMI constraints favor lower frequency. |
| TPS54340DDAR | 42 V input, 3.5 A output, 500 kHz, SOIC-8; higher current, no integrated bootstrap diode. | Targets higher-power loads (e.g., motor drivers, multi-rail systems); requires external bootstrap diode and more complex compensation. | Select when >500 mA output current is required and board space permits larger external components. |
Compared with LM22674QMRE-ADJ/NOPB, LM22670MRE-ADJ/NOPB offers wider input range at lower frequency, while TPS54340DDAR scales output current at the cost of added external components and design complexity-making LM22674QMRE-ADJ/NOPB optimal for compact, medium-current industrial point-of-load designs.
Availability
LM22674QMRE-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power management, and embedded medical device designs requiring stable component supply across extended temperature and input voltage ranges.
Supply support for LM22674QMRE-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 LM22674QMRE-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family-designed for ease-of-use in non-isolated DC/DC conversion with minimal external components and integrated protection features.
FAQ
What is the minimum output voltage supported by the LM22674QMRE-ADJ/NOPB?
The LM22674QMRE-ADJ/NOPB supports a minimum output voltage of 1.285 V, set by its internal feedback reference voltage. This value is specified with ±1.5% accuracy over –40°C to 125°C junction temperature and is achieved using an external resistor divider connected to the FB pin. Output voltages below 1.285 V are not achievable with this device.
Does the LM22674QMRE-ADJ/NOPB require an external bootstrap diode?
No, the LM22674QMRE-ADJ/NOPB integrates a bootstrap diode internally. The BOOT pin connects directly to an external 10 nF ceramic capacitor between BOOT and SW-no external diode is needed. This integration reduces component count, improves reliability, and simplifies PCB layout compared to controllers requiring discrete bootstrap solutions.
What is the purpose of the NC pins (2 and 3) on the LM22674QMRE-ADJ/NOPB?
Pins 2 and 3 of the LM22674QMRE-ADJ/NOPB are designated as No-Connect (NC) terminals. They are not electrically connected to the silicon die but serve as thermal conductors. These pins may be left floating or connected to ground for mechanical reinforcement and improved thermal coupling to the PCB, though electrical connection is optional and does not affect functionality.
How does the enable function work on the LM22674QMRE-ADJ/NOPB?
The LM22674QMRE-ADJ/NOPB features a precision enable pin (EN) with a 1.6 V typical turn-on threshold and 0.6 V hysteresis. Pulling EN below 1.3 V disables the regulator, reducing quiescent current to 25 µA. The pin has a 6 µA internal pullup, allowing it to be tied directly to VIN or driven by a resistor divider for power sequencing. Voltages above 2.2 V reliably enable operation.
Can the LM22674QMRE-ADJ/NOPB operate with ceramic output capacitors only?
Yes, the LM22674QMRE-ADJ/NOPB is explicitly designed to be stable with low-ESR ceramic output capacitors. Its internal Type III compensation and voltage-mode architecture eliminate the need for high-ESR electrolytic or tantalum capacitors. A typical design uses a 22 µF X5R ceramic capacitor, significantly reducing size, cost, and aging-related drift versus traditional alternatives.
LM22674QMRE-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
LM22674QMRE-ADJ/NOPB FAQ
1.How can I place an order for LM22674QMRE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22674QMRE-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 LM22674QMRE-ADJ/NOPB reliable?
The price and inventory of LM22674QMRE-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 LM22674QMRE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22674QMRE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22674QMRE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22674QMRE-ADJ/NOPB?
LM22674QMRE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22674QMRE-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 LM22674QMRE-ADJ/NOPB?
For technical support, including LM22674QMRE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22674QMRE-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22674QMRE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22674QMRE-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 LM22674QMRE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22674QMRE-ADJ/NOPB?
All LM22674QMRE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22674QMRE-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 LM22674QMRE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22674QMRE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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