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Texas Instruments LM22676MRX-5.0/NOPB
- Part No.:
- LM22676MRX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22676MRX-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:863
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Product details
Overview
LM22676MRX-5.0/NOPB from Texas Instruments is a 42 V, 3 A synchronous step-down DC/DC regulator in an 8-pin SO PowerPAD package, delivering a fixed 5.0 V output with ±1.5% feedback reference accuracy, 500 kHz switching frequency, and integrated bootstrap diode - used in industrial power rails requiring stable 5 V at up to 3 A from 4.5–42 V input.
For engineers reviewing the LM22676MRX-5.0/NOPB datasheet, LM22676MRX-5.0/NOPB pinout, LM22676MRX-5.0/NOPB application, or LM22676MRX-5.0/NOPB equivalent, key selection criteria include its internally compensated voltage-mode control, 120 mΩ high-side MOSFET, thermal shutdown at 150°C, and compatibility with low-ESR ceramic output capacitors without external compensation.
Technical Context
The LM22676MRX-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), enabling robust transient response without external compensation. Its internal Type III compensation network is optimized for fixed 5 V output configurations.
It integrates a 120 mΩ N-channel MOSFET switch, bootstrap gate driver with integrated diode, precision enable input (1.6 V threshold, 0.6 V hysteresis), and soft-start circuitry (500 µs typical ramp). Thermal shutdown (150°C trip, 135°C recovery) and cycle-by-cycle current limiting (typ. 3.4 A) provide fault protection.
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 12 V, 24 V, and 48 V nominal industrial rails |
| Max Output Current | 3 A continuous - limited by thermal design and PCB copper area on exposed pad |
| Switching Frequency | 500 kHz ±20% - enables compact 2.2 µH–10 µH inductors and <100 µF ceramic output caps |
| RDS(ON) | 120 mΩ (typ) - reduces conduction loss at full load; SO PowerPAD improves thermal resistance to 22°C/W |
| Quiescent Current | 3.4 mA (typ) at VFB = 5 V - enables efficient light-load operation in always-on systems |
| Standby Current | 25 µA (typ) in shutdown - minimizes battery drain when EN = 0 V |
Pinout & Package
LM22676MRX-5.0/NOPB uses the SO PowerPAD (DDA) 8-pin thermally enhanced package (4.89 mm × 3.90 mm) with exposed pad soldered to PCB ground plane for thermal management and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch node | Drives external inductor; swings from GND to VIN; requires low-inductance layout to minimize ringing |
| 2 VIN | Power input | 4.5–42 V supply input; bypassed locally with ≥10 µF ceramic capacitor near pin |
| 3 BOOT | Bootstrap supply | Connects to SW via 10 nF ceramic capacitor; supplies gate drive for high-side MOSFET |
| 4 GND | System ground | Analog and power ground reference; tied directly to exposed pad and PCB ground plane |
| 5 EN | Enable control | Logic-compatible input; 1.6 V threshold (0.6 V hysteresis); pulls up internally at 6 µA |
| 6 FB | Feedback input | Internally connected to 5 V divider; shorted to VOUT for fixed-output operation |
| 7 NC | No connect | Not electrically bonded; serves as thermal conductor only - must be grounded per layout guidelines |
| 8 NC | No connect | Not electrically bonded; serves as thermal conductor only - must be grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bootstrap diode | Eliminates external Schottky diode in boot path, reducing BOM count and layout area |
| Internal loop compensation | Enables stable 5 V regulation with no external compensation components - simplifies design validation |
| Stable with ceramic capacitors | Supports low-ESR ceramic output caps (≥22 µF) without oscillation - avoids costly tantalum or electrolytic parts |
| Precision enable with UVLO | Allows controlled power sequencing and external undervoltage lockout down to 3.9 V falling threshold |
| Thermal shutdown + current limit | Protects against sustained overload and PCB overheating - auto-recovery after cooldown |
Applications
| Industrial PLC I/O Power | Telecom Line Card Bias |
|---|---|
Use Scenario: Powering isolated digital I/O modules in programmable logic controllers operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary 5 V buck regulator supplying microcontroller, optocouplers, and level-shifters. Use Value: Delivers 3 A at 5 V with <1% line/load regulation and 92% efficiency at 24 VIN, eliminating need for heatsinks in confined enclosures. |
Use Scenario: Generating local 5 V bias for Ethernet PHYs and SerDes interfaces on telecom line cards fed from –48 V or 24 V backplane. IC Role / Device Role / Timing Role: Point-of-load converter downstream of intermediate bus converter. Use Value: Withstands 42 V transients common in telecom environments and maintains regulation during 100 ms brownouts due to fast 500 kHz loop bandwidth. |
| Embedded Control Unit | Automotive Body Control Module |
Use Scenario: Powering ARM Cortex-M7-based motor control units in factory automation equipment with 12 V or 24 V supply. IC Role / Device Role / Timing Role: Main 5 V rail for MCU, CAN transceivers, and ADC references. Use Value: Soft-start (500 µs) prevents inrush into large system capacitance; EN pin enables coordinated startup with FPGA and memory. |
Use Scenario: Supplying 5 V to microcontrollers and sensors in non-safety-critical body electronics (e.g., door modules, lighting controllers). IC Role / Device Role / Timing Role: Secondary regulator deriving 5 V from vehicle battery (9–16 V nominal, up to 42 V load dump). Use Value: Qualified per AEC-Q100 Grade 1 (–40°C to +125°C) and withstands 42 V load-dump pulses without latch-off. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670MRX-5.0/NOPB | Lower 36 V max input, same 5 V output, 3 A rating, but 100 mΩ RDS(ON) and 600 kHz fSW | Better efficiency at 12 VIN; not rated for 42 V transients or automotive load dump | Select when input never exceeds 36 V and higher switching frequency is preferred for smaller magnetics |
| TPS54302DDCR | 36 V max input, 3 A, 500 kHz, but requires external compensation and has no integrated bootstrap diode | Higher design complexity; needs external boot diode and compensation network | Choose when adjustable output or tighter output tolerance (±1%) is required, and layout space allows extra passives |
Compared with LM22676MRX-5.0/NOPB, LM22670MRX-5.0/NOPB offers lower RDS(ON) but sacrifices 42 V surge capability, while TPS54302DDCR provides greater flexibility at the cost of increased component count and layout sensitivity.
Availability
LM22676MRX-5.0/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power conversion, and embedded systems requiring stable component supply with long-term lifecycle support.
Supply support for LM22676MRX-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 specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability DC/DC conversion.
The LM22676 product line delivers SIMPLE SWITCHER® buck regulators targeting industrial, telecom, and automotive applications where ease of design, thermal robustness, and wide input range are critical.
FAQ
What is the maximum input voltage the LM22676MRX-5.0/NOPB can safely handle?
The LM22676MRX-5.0/NOPB supports a recommended operating input voltage range of 4.5 V to 42 V. Its absolute maximum rating is 43 V, but sustained operation above 42 V risks damage. The device is specifically designed to survive automotive load-dump transients up to 42 V, making it suitable for 24 V industrial and vehicle systems where such surges occur.
Does the LM22676MRX-5.0/NOPB require external compensation components?
No, the LM22676MRX-5.0/NOPB features fully internal loop compensation optimized for its fixed 5.0 V output configuration. This eliminates the need for external compensation resistors or capacitors, reducing bill-of-materials count and layout complexity while ensuring stability with standard ceramic output capacitors.
How is the feedback pin (FB) configured for the fixed 5.0 V version?
For the LM22676MRX-5.0/NOPB, the FB pin is internally connected to a precision 1.285 V reference and a resistor divider that sets the output to exactly 5.0 V. The FB pin must be connected directly to the output voltage node - no external resistors are required, unlike the adjustable -ADJ variant.
Can the LM22676MRX-5.0/NOPB operate with ceramic output capacitors only?
Yes, the LM22676MRX-5.0/NOPB is explicitly characterized and stabilized for use with low-ESR ceramic output capacitors (≥22 µF typical). Its internal compensation and voltage-mode architecture eliminate the need for high-ESR electrolytic or tantalum capacitors, improving reliability and reducing footprint.
What thermal performance can be expected from the SO PowerPAD package?
The LM22676MRX-5.0/NOPB in SO PowerPAD (DDA) package achieves a junction-to-ambient thermal resistance (RθJA) of 22°C/W when mounted on a 2-layer PCB with 1 in² of 2-oz copper connected to the exposed pad. This enables full 3 A output at ambient temperatures up to 85°C without forced airflow.
LM22676MRX-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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM22676MRX-5.0/NOPB FAQ
1.How can I place an order for LM22676MRX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22676MRX-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 LM22676MRX-5.0/NOPB reliable?
The price and inventory of LM22676MRX-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 LM22676MRX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM22676MRX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22676MRX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22676MRX-5.0/NOPB?
LM22676MRX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22676MRX-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 LM22676MRX-5.0/NOPB?
For technical support, including LM22676MRX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22676MRX-5.0/NOPB requirements.
6.How does Aetrix verify that LM22676MRX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22676MRX-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 LM22676MRX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM22676MRX-5.0/NOPB?
All LM22676MRX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22676MRX-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 LM22676MRX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM22676MRX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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