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Texas Instruments LM22678QTJ-5.0/NOPB
- Part No.:
- LM22678QTJ-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22678QTJ-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 5A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:3,282
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Product details
Overview
LM22678QTJ-5.0/NOPB from Texas Instruments is a 42-V input, 5-A synchronous step-down DC/DC regulator with fixed 5.0-V output, 500-kHz switching frequency, ±1.5% feedback reference accuracy, and integrated 100-mΩ N-channel MOSFET. It operates from –40°C to 125°C and delivers >90% efficiency in industrial power conversion applications.
For engineers reviewing the LM22678QTJ-5.0/NOPB datasheet, LM22678QTJ-5.0/NOPB pinout, LM22678QTJ-5.0/NOPB application, or LM22678QTJ-5.0/NOPB equivalent, this device supports high-vin distributed power systems requiring stable 5-V rail generation with minimal external components, thermal robustness, and precision enable control.
Technical Context
The LM22678QTJ-5.0/NOPB implements voltage-mode PWM control with input voltage feedforward for loop gain stabilization across wide VIN ranges. Its internal Type III compensation eliminates external compensation networks and is optimized for fixed 5-V operation.
It integrates a bootstrap diode, soft-start (500 µs typical), thermal shutdown (150°C trip), current limiting (6.0–8.4 A), and precision enable with 1.6-V threshold and 0.6-V hysteresis - enabling reliable sequencing and undervoltage lockout via external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide-input industrial and automotive battery-fed systems without pre-regulation. |
| Output Voltage | Fixed 5.0 V ±1.5% - eliminates external feedback divider; enables direct replacement of linear regulators in 5-V logic rails. |
| Max Output Current | 5 A continuous - sustains full load under worst-case thermal conditions with proper PCB copper area. |
| Switching Frequency | 500 kHz ±20% - balances small external inductor/capacitor size with EMI and transient response requirements. |
| RDS(ON) | 100 mΩ typical - reduces conduction loss and improves efficiency at high load currents. |
| Junction Temp Range | –40°C to 125°C - qualified for extended industrial and automotive-grade environments (AEC-Q100 Grade 1). |
| Quiescent Current | 3.4 mA typical - ensures low no-load power loss in always-on subsystems. |
| Standby Current | 25 µA typical - enables ultra-low-power shutdown mode for system-level energy management. |
Pinout & Package
LM22678QTJ-5.0/NOPB uses the TO-263-7 (PFM) package with 10.16 mm × 9.85 mm body size and thermally enhanced exposed pad (EP) tied to GND for PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Drives external inductor; swings between ~0 V and VIN during PWM operation. |
| VIN | Input supply | Primary power input (4.5–42 V); connects to bulk capacitor and feeds internal LDO for bias. |
| GND | Power ground | System return path for switch, controller, and feedback; must be low-impedance connection to EP. |
| BOOT | Bootstrap supply | Provides gate drive voltage for high-side MOSFET via external 10-nF ceramic capacitor to SW. |
| FB | Feedback input | Internally connected to 5-V reference; shorted directly to VOUT for fixed-output configuration. |
| EN | Enable control | Logic-level input (1.6-V threshold, 0.6-V hysteresis); pulls up internally to enable default operation. |
| NC | No-connect | Not electrically bonded; serves as thermal conductor only - must not be routed or connected. |
| EP | Exposed pad | Thermal and electrical ground; requires solid solder connection to ≥1 in² PCB copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates external compensation network - simplifies design and improves consistency across production units. |
| Integrated bootstrap diode | Removes need for external bootstrap diode - reduces BOM count and layout complexity while maintaining gate drive reliability. |
| Stable with low-ESR ceramic capacitors | Enables use of compact, high-reliability MLCCs instead of electrolytics - improves lifetime and reduces footprint. |
| Precision enable with UVLO support | Allows controlled power sequencing and configurable undervoltage lockout using external resistor divider on EN pin. |
| Built-in soft-start (500 µs) | Prevents inrush current and output overshoot during startup - avoids stress on downstream circuitry and input source. |
| Thermal shutdown + current limit protection | Provides autonomous fault recovery under overload or poor heatsinking - prevents permanent damage without external circuitry. |
Applications
| Industrial Distributed Power | Test & Measurement Equipment |
|---|---|
|
Use Scenario: Powering FPGA I/O banks, microcontroller peripherals, and analog front-ends from unregulated 24-V or 48-V bus rails in programmable logic controllers. IC Role / Device Role / Timing Role: Primary 5-V buck regulator delivering regulated rail with fast transient response and low output ripple. Use Value: Delivers 5 A at >90% efficiency with minimal external components, reducing board space and thermal design effort. |
Use Scenario: Generating clean 5-V supply for precision ADC references, DAC buffers, and digital signal processors in benchtop analyzers. IC Role / Device Role / Timing Role: High-stability DC/DC converter providing low-noise, tightly regulated 5-V rail independent of input fluctuations. Use Value: ±1.5% reference accuracy and internal compensation ensure consistent regulation across temperature and line variations. |
| Appliance Control Boards | General-Purpose Wide VIN Systems |
|
Use Scenario: Replacing linear regulators on smart appliance mainboards where 12–42-V battery or rectified AC supplies power MCU and sensors. IC Role / Device Role / Timing Role: Efficient step-down regulator converting variable input to stable 5-V logic supply with thermal foldback protection. Use Value: 125°C junction rating and integrated thermal shutdown enable reliable operation in enclosed, high-ambient environments. |
Use Scenario: Providing 5-V rail in ruggedized embedded systems powered by automotive batteries (9–16 V), solar arrays (up to 42 V), or industrial 24-V lines. IC Role / Device Role / Timing Role: Wide-input buck converter supporting multiple power sources without redesign or component change. Use Value: 4.5–42-V input range and AEC-Q100 Grade 1 qualification allow single-BOM deployment across automotive, industrial, and off-grid applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22678TJ-5.0/NOPB | Same electrical specs but TO-220-7 package (no exposed pad); higher RθJA (35°C/W vs 22°C/W). | Limited to lower ambient temperatures or reduced load current due to inferior thermal performance. | Select when TO-220 mounting is required and thermal margin allows ≤3.5 A continuous output. |
| LM61460QWRVRRQ1 | 3–36-V input, 6-A output, 2.1-MHz switching, lower IQ (26 µA), and integrated EMI filters. | Higher frequency enables smaller magnetics; improved light-load efficiency and EMI compliance for noise-sensitive systems. | Choose for next-gen designs prioritizing size, EMI, and ultra-low standby power - requires PCB redesign and new magnetics. |
Compared with LM22678QTJ-5.0/NOPB, the LM22678TJ-5.0/NOPB offers identical regulation but requires greater thermal derating, while the LM61460QWRVRRQ1 provides higher integration and efficiency at the cost of input voltage range reduction and layout rework.
Availability
LM22678QTJ-5.0/NOPB is available at Aetrix Electronics and suitable for industrial distributed power, test & measurement equipment, and appliance control boards requiring stable component supply, long-term lifecycle assurance, and automotive-grade reliability.
Supply support for LM22678QTJ-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 power conversion solutions.
The LM22678QTJ-5.0/NOPB belongs to TI's SIMPLE SWITCHER® family - designed for ease-of-use in wide-input DC/DC applications, minimizing external components and accelerating time-to-market through WEBENCH® integration.
FAQ
What is the maximum input voltage rating for LM22678QTJ-5.0/NOPB?
The absolute maximum input voltage for LM22678QTJ-5.0/NOPB is 43 V, but the recommended operating range is 4.5 V to 42 V. Operation above 42 V risks exceeding safe operating area limits and may trigger overvoltage protection or cause irreversible damage. Always maintain at least 1-V margin below 43 V in production designs.
Does LM22678QTJ-5.0/NOPB require an external feedback resistor divider?
No, LM22678QTJ-5.0/NOPB has an internal 5.0-V feedback reference and does not require an external resistor divider. The FB pin must be connected directly to the output capacitor or VOUT net. Using an external divider will disrupt regulation and cause output voltage error.
How is thermal performance managed on LM22678QTJ-5.0/NOPB?
LM22678QTJ-5.0/NOPB relies on its exposed pad (EP) soldered to ≥1 in² of PCB copper for thermal conduction. With proper layout, its junction-to-ambient thermal resistance is 22°C/W. Thermal shutdown activates at ~150°C, and the device resumes operation after cooling to ~135°C.
Can LM22678QTJ-5.0/NOPB operate in dropout mode?
No, LM22678QTJ-5.0/NOPB is a buck-only regulator and cannot regulate when VIN falls below the minimum required for duty-cycle headroom. At 5-V output, dropout occurs below ~6.5 V input depending on load and temperature. Below 4.5 V, UVLO disables operation entirely.
Is LM22678QTJ-5.0/NOPB AEC-Q100 qualified?
Yes, LM22678QTJ-5.0/NOPB is the automotive-grade variant (denoted by "Q" suffix) and is AEC-Q100 Grade 1 qualified for operation from –40°C to +125°C junction temperature, making it suitable for under-hood and infotainment power applications.
LM22678QTJ-5.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- TO-263-7 Thin
- 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:
- 5A
- 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:
- TO-263-7 Thin
LM22678QTJ-5.0/NOPB FAQ
1.How can I place an order for LM22678QTJ-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22678QTJ-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 LM22678QTJ-5.0/NOPB reliable?
The price and inventory of LM22678QTJ-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 LM22678QTJ-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM22678QTJ-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22678QTJ-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22678QTJ-5.0/NOPB?
LM22678QTJ-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22678QTJ-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 LM22678QTJ-5.0/NOPB?
For technical support, including LM22678QTJ-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22678QTJ-5.0/NOPB requirements.
6.How does Aetrix verify that LM22678QTJ-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22678QTJ-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 LM22678QTJ-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM22678QTJ-5.0/NOPB?
All LM22678QTJ-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22678QTJ-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 LM22678QTJ-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM22678QTJ-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM22678QTJ-5.0/NOPB Tags
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