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Texas Instruments LM22676QMRX-5.0/NOPB
- Part No.:
- LM22676QMRX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22676QMRX-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:3,481
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Product details
Overview
LM22676QMRX-5.0/NOPB from Texas Instruments is an automotive-grade 42 V, 3 A synchronous step-down DC/DC regulator in PSOP-8 package with fixed 5.0 V output, 500 kHz switching frequency, ±1.5% feedback reference accuracy, and integrated bootstrap diode - used for stable 5 V rail generation in harsh-environment industrial and automotive power systems.
For engineers reviewing the LM22676QMRX-5.0/NOPB datasheet, LM22676QMRX-5.0/NOPB pinout, LM22676QMRX-5.0/NOPB application, or LM22676QMRX-5.0/NOPB equivalent, key selection criteria include AEC-Q100 Grade 1 qualification (–40°C to +125°C), internal voltage-mode compensation, 100 mΩ N-channel MOSFET, precision enable threshold (1.6 V typ), and thermal shutdown at 150°C.
Technical Context
The LM22676QMRX-5.0/NOPB implements a voltage-mode PWM controller 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 fixed 5 V output, eliminating external compensation components.
It integrates a 100 mΩ N-channel MOSFET switch, bootstrap gate driver with integrated diode, soft-start (500 µs typ), precision enable with 0.6 V hysteresis, and undervoltage lockout (UVLO) with 4.3 V rising threshold - enabling robust start-up control and system-level power sequencing in automotive applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.5% over –40°C to +125°C junction temperature |
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to 12 V/24 V automotive rails and industrial 36 V systems |
| Switching Frequency | 500 kHz ±20% - enables compact magnetics and low-output-ripple designs |
| Max Output Current | 3 A continuous - limited by internal current sense and thermal design (RθJA = 22°C/W in PSOP-8) |
| MOSFET RDS(ON) | 100 mΩ typical - reduces conduction loss and improves efficiency at high load currents |
| Enable Threshold | 1.6 V typical with 0.6 V hysteresis - allows precise power sequencing using resistor dividers from upstream rails |
| Quiescent Current | 3.4 mA typical at VOUT = 5 V - balances light-load efficiency and fast transient response |
| Standby Current | 25 µA typical in shutdown - minimizes battery drain during vehicle sleep modes |
Pinout & Package
LM22676QMRX-5.0/NOPB uses the PSOP-8 (PFM) package: 4.89 mm × 3.90 mm body with exposed thermal pad connected to GND for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch node | Drives external inductor; swings between ~0 V and VIN; requires low-inductance layout to minimize EMI |
| 2 - VIN | Main input supply | Accepts 4.5 V–42 V; must be decoupled locally with ≥10 µF ceramic capacitor near pin |
| 3 - BOOT | Bootstrap supply | Connects to SW via 10 nF ceramic capacitor; powers high-side gate driver; minimum off-time ensures recharge |
| 4 - GND | System ground | Power and signal return; tied to exposed pad; requires low-impedance PCB copper pour |
| 5 - NC | No connect | Thermal conductor only; not electrically bonded; must remain unconnected in circuit |
| 6 - FB | Feedback input | Internally biased to 5.0 V reference; shorted directly to VOUT for fixed-output operation |
| 7 - EN | Enable control | Active-high logic input; 1.6 V threshold enables startup; 25 µA shutdown current minimizes leakage |
| 8 - NC | No connect | Thermal conductor only; not electrically bonded; must remain unconnected in circuit |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C TJ) - validated for under-hood and engine-control module use |
| Integrated bootstrap diode | Eliminates external Schottky diode in boot path - reduces BOM count and layout area |
| Internal compensation | Type III network optimized for 5 V output - removes need for external compensation components |
| Soft-start timing | 500 µs fixed ramp - prevents inrush current and stabilizes output during cold crank conditions |
| Thermal protection | 150°C shutdown with 135°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking |
| Stable with ceramic caps | Compatible with low-ESR ceramic output capacitors - simplifies filtering and improves transient response |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
|
Use Scenario: Powering microcontrollers, CAN transceivers, and sensor interfaces in BCMs exposed to 12 V battery fluctuations and load-dump transients. IC Role / Device Role / Timing Role: Primary 5 V buck regulator delivering clean, regulated power with fast line regulation to maintain MCU operation during cranking (6.5 V min). Use Value: 42 V absolute max rating and UVLO (4.3 V rising) prevent brownout resets; 3 A capability supports multi-rail LDOs downstream. |
Use Scenario: Generating isolated 5 V logic supply for digital I/O modules in programmable logic controllers operating from 24 V DC field buses. IC Role / Device Role / Timing Role: High-efficiency intermediate converter stepping down 24 V to 5 V before LDO post-regulation for noise-sensitive analog circuits. Use Value: 500 kHz switching enables small 4.7 µH inductors; internal compensation avoids tuning delays in production validation. |
| Telecom Remote Radio Unit | Medical Diagnostic Imaging Subsystem |
|
Use Scenario: Providing 5 V bias for RF front-end ICs and ADCs in outdoor 4G/5G RRUs powered from -48 V telecom rectifiers via intermediate 12 V bus. IC Role / Device Role / Timing Role: Secondary buck stage converting 12 V to 5 V with high PSRR and low ripple to preserve RF signal integrity. Use Value: ±1.5% output accuracy ensures consistent ADC reference performance; 100 mΩ RDS(ON) maintains >92% efficiency at 2.5 A. |
Use Scenario: Supplying 5 V to FPGA configuration memory and interface logic in portable ultrasound or X-ray subsystems requiring low EMI and high reliability. IC Role / Device Role / Timing Role: Safety-critical power stage where thermal shutdown and current limiting protect against single-point failures in sealed enclosures. Use Value: AEC-Q100 qualification provides traceable process controls; exposed pad enhances thermal margin in fanless designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22676QMRX-ADJ/NOPB | Adjustable output (1.285 V min); requires external resistor divider; same PSOP-8 package and thermal specs | Suitable when multiple output voltages needed on same board or future-proofing for design variants | Select if flexibility in output voltage outweighs BOM simplicity of fixed 5 V |
| TPS54340QDDARQ1 | 42 V, 3.5 A; 2.5 V–28 V adjustable output; 125°C max junction; no integrated bootstrap diode | Requires external bootstrap diode and compensation; higher peak current but less integrated functionality | Choose when higher current headroom or tighter output tolerance (±1%) is required |
Compared with LM22676QMRX-5.0/NOPB, the ADJ variant trades fixed-voltage simplicity for design flexibility, while TPS54340QDDARQ1 offers higher current and tighter accuracy at the cost of added external components and reduced integration.
Availability
LM22676QMRX-5.0/NOPB is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O power supplies, and telecom remote radio units requiring stable component supply with AEC-Q100 compliance and long-term lifecycle support.
Supply support for LM22676QMRX-5.0/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, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The LM22676-Q1 product line delivers rugged, AEC-Q100 qualified DC/DC regulators targeting automotive power distribution and industrial control systems requiring high input voltage tolerance and extended temperature operation.
FAQ
What is the maximum input voltage rating for LM22676QMRX-5.0/NOPB?
The LM22676QMRX-5.0/NOPB has an absolute maximum input voltage rating of 43 V, with recommended operation from 4.5 V to 42 V. This 42 V upper limit supports direct connection to 24 V industrial buses and 12 V automotive systems with load-dump transients. Exceeding 43 V risks permanent damage per the Absolute Maximum Ratings table in the SNVS587L datasheet.
Does LM22676QMRX-5.0/NOPB require external compensation components?
No, LM22676QMRX-5.0/NOPB features fully internal type III compensation optimized for its fixed 5.0 V output. Unlike adjustable versions, it eliminates the need for external RC networks on the FB pin. This simplifies layout, reduces BOM count, and accelerates design validation - confirmed in Section 7.3.4 of the SNVS587L datasheet.
How is thermal performance managed in the PSOP-8 package of LM22676QMRX-5.0/NOPB?
LM22676QMRX-5.0/NOPB uses a PSOP-8 package with an exposed thermal pad connected to GND. Its junction-to-ambient thermal resistance (RθJA) is 22°C/W, significantly lower than the SO PowerPAD variant (60°C/W). Effective thermal design requires soldering the exposed pad to a large copper pour on the PCB - detailed in Section 10.3 "Thermal Considerations" of the SNVS587L datasheet.
Can LM22676QMRX-5.0/NOPB operate with ceramic output capacitors?
Yes, LM22676QMRX-5.0/NOPB is explicitly designed to be stable with low-ESR ceramic output capacitors - a key feature highlighted in the "Features" section of SNVS587L. This eliminates the need for bulk electrolytic capacitors, reduces footprint, improves transient response, and enhances reliability in high-vibration environments like automotive applications.
What is the purpose of the NC pins in LM22676QMRX-5.0/NOPB's PSOP-8 package?
Pins 2, 3, and 8 in the LM22676QMRX-5.0/NOPB PSOP-8 package are marked NC (No Connect) and serve only as thermal conductors - they are not electrically bonded internally. Per the Pin Functions table in SNVS587L, these pins must remain unconnected in the schematic and layout to avoid unintended parasitic paths or thermal coupling issues.
LM22676QMRX-5.0/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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- 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
LM22676QMRX-5.0/NOPB FAQ
1.How can I place an order for LM22676QMRX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22676QMRX-5.0/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 LM22676QMRX-5.0/NOPB reliable?
The price and inventory of LM22676QMRX-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM22676QMRX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM22676QMRX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22676QMRX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22676QMRX-5.0/NOPB?
LM22676QMRX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22676QMRX-5.0/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 LM22676QMRX-5.0/NOPB?
For technical support, including LM22676QMRX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22676QMRX-5.0/NOPB requirements.
6.How does Aetrix verify that LM22676QMRX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22676QMRX-5.0/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 LM22676QMRX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM22676QMRX-5.0/NOPB?
All LM22676QMRX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22676QMRX-5.0/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 LM22676QMRX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM22676QMRX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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