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Texas Instruments LM22678TJ-ADJ/NOPB
- Part No.:
- LM22678TJ-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22678TJ-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,405
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Product details
Overview
LM22678TJ-ADJ/NOPB from Texas Instruments is a 42-V input, 5-A synchronous step-down DC/DC regulator with adjustable output (down to 1.285 V), 500-kHz fixed-frequency voltage-mode control, and integrated 100-mΩ N-channel MOSFET. It operates from –40°C to 125°C junction temperature and delivers >90% efficiency in industrial power conversion applications.
For engineers reviewing the LM22678TJ-ADJ/NOPB datasheet, LM22678TJ-ADJ/NOPB pinout, LM22678TJ-ADJ/NOPB application, or LM22678TJ-ADJ/NOPB equivalent, key selection criteria include its internally compensated loop, precision enable threshold (1.6 V typ.), ±1.5% feedback reference accuracy, thermal shutdown at 150°C, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The LM22678TJ-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 is optimized for outputs ≤5 V, eliminating external compensation components.
It integrates a bootstrap diode, soft-start (500 µs typ.), undervoltage lockout (UVLO rising threshold 4.3 V), and cycle-by-cycle current limiting (6.0–8.4 A). The exposed-pad TO-263-7 package provides thermal performance of 22°C/W (1-in² copper).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide-VIN industrial and automotive battery-fed systems |
| Output Current | Up to 5 A continuous - enables single-regulator solutions for mid-power rails |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; enables precise low-voltage regulation |
| Switching Frequency | 500 kHz (±20%) - allows compact magnetics and good transient response |
| RDS(ON) | 0.1 Ω (typ.) - reduces conduction loss and improves full-load efficiency |
| Quiescent Current | 3.4 mA (typ.) - minimizes no-load power draw in always-on subsystems |
| Standby Current | 25 µA (typ.) - enables ultra-low-power shutdown for energy-sensitive designs |
| Junction Temp Range | –40°C to 125°C - qualified for harsh industrial environments without derating |
Pinout & Package
LM22678TJ-ADJ/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 from ~0 V to VIN during operation |
| VIN | Input supply | Primary power input (4.5–42 V); connects to input capacitor and EN divider |
| GND | Power ground | System return path for switch, feedback, and enable circuits |
| BOOT | Bootstrap supply | Provides gate drive voltage for high-side MOSFET via external 10-nF ceramic cap |
| FB | Feedback input | Senses output via resistor divider; regulates VOUT to 1.285 V reference |
| EN | Enable control | Logic-level ON/OFF control with 1.6 V threshold and 0.6 V hysteresis |
| NC | No connect | Internally unconnected; functions as thermal conductor only |
| EP | Exposed pad | Must be soldered to GND plane for thermal management and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control | Eliminates external compensation network - reduces BOM count and design iteration time |
| Integrated bootstrap diode | Removes need for external bootstrap diode - simplifies layout and improves reliability |
| Precision enable pin | 1.6 V threshold with 0.6 V hysteresis - enables accurate power sequencing and external UVLO implementation |
| Stable with ceramic capacitors | Compatible with low-ESR X7R/X5R MLCCs - avoids bulkier electrolytics and improves longevity |
| Built-in soft-start | 500 µs fixed ramp - prevents inrush current and output overshoot during startup |
| Thermal shutdown protection | 150°C trip with 135°C hysteresis - prevents permanent damage under sustained overload or poor heatsinking |
Applications
| Industrial Power Supply | Test Equipment Rail |
|---|---|
Use Scenario: Distributed 24-V bus powering PLC I/O modules, sensors, and actuators requiring stable 3.3-V or 5-V rails. IC Role / Device Role / Timing Role: Primary buck regulator converting 24-V industrial bus to isolated low-voltage logic supplies. Use Value: Delivers 5-A peak current with >90% efficiency and minimal external components - reduces board space and thermal complexity. | Use Scenario: Programmable power supply in benchtop test equipment needing clean, adjustable output voltages down to 1.285 V. IC Role / Device Role / Timing Role: Adjustable-output DC/DC stage enabling fine-grained voltage control for DUT biasing and calibration. Use Value: ±1.5% reference accuracy and stable ceramic-capacitor operation ensure repeatable, low-noise output for measurement integrity. |
| Appliance Control Board | General-Purpose Wide-VIN System |
Use Scenario: Main power rail on smart appliance MCU boards powered from rectified AC or 12–42-V battery packs. IC Role / Device Role / Timing Role: High-reliability step-down converter supplying 3.3-V microcontroller core and peripheral rails. Use Value: –40°C to 125°C operation and integrated protections (UVLO, current limit, thermal shutdown) ensure robustness in variable ambient conditions. | Use Scenario: Universal input power stage in field-deployable IoT gateways accepting 12–42-V DC inputs from solar, PoE++, or vehicle batteries. IC Role / Device Role / Timing Role: Wide-input buck regulator delivering regulated 5-V or 3.3-V system rail with minimal external parts. Use Value: 42-V absolute max rating and 500-kHz switching enable compact, high-efficiency design across diverse input sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670TJ-ADJ/NOPB | 3-A output rating, same 42-V input, identical pinout and compensation architecture | Lower current capability - suitable where load <3 A and thermal margin is constrained | Select when full 5-A capability is unnecessary and cost/size optimization is prioritized |
| LM61460QWRVRRQ1 | 6-A output, 3–36-V input, lower quiescent current (26 µA), integrated EMI filtering, AEC-Q100 Grade 1 | Automotive-qualified with improved light-load efficiency and EMI performance - requires layout revision | Choose for new automotive designs or where <100-µA standby and CISPR-25 compliance are mandatory |
Compared with LM22678TJ-ADJ/NOPB, LM22670TJ-ADJ/NOPB offers reduced current capacity in the same footprint, while LM61460QWRVRRQ1 provides higher current, wider low-end VIN range, and automotive qualification - but demands updated layout and component selection.
Availability
LM22678TJ-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial distributed power, test and measurement instrumentation, and appliance control applications requiring stable component supply and long-term manufacturability.
Supply support for LM22678TJ-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.
The LM22678TJ-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - designed for ease-of-use in high-voltage DC/DC conversion with minimal external components and full WEBENCH® design tool integration.
FAQ
What is the minimum output voltage supported by the LM22678TJ-ADJ/NOPB?
The LM22678TJ-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 temperature (–40°C to 125°C) and line, enabling precise low-voltage regulation for modern MCUs and FPGAs. The FB pin must be connected to a resistor divider between VOUT and GND to configure any output ≥1.285 V.
Does the LM22678TJ-ADJ/NOPB require an external bootstrap diode?
No, the LM22678TJ-ADJ/NOPB integrates a bootstrap diode internally. A 10-nF ceramic capacitor must still be placed between BOOT and SW pins to provide gate drive voltage for the high-side MOSFET, but no external diode is needed - reducing component count, layout area, and potential failure points in the bootstrap circuit.
What thermal performance can be expected from the LM22678TJ-ADJ/NOPB in a standard PCB layout?
With 1 square inch of 2-oz copper connected to the exposed pad, the LM22678TJ-ADJ/NOPB achieves a junction-to-ambient thermal resistance (RθJA) of 22°C/W. Actual performance varies between 20–30°C/W depending on copper area and airflow. For 5-A continuous operation at 42-V input, thermal design must ensure junction temperature remains ≤125°C under worst-case ambient and load conditions.
How does the enable pin (EN) function on the LM22678TJ-ADJ/NOPB?
The EN pin on the LM22678TJ-ADJ/NOPB provides precision ON/OFF control with a 1.6-V typical threshold and 0.6-V hysteresis. Pulling EN below 1.6 V disables the regulator, reducing input current to 25 µA (typ.). An internal 6-µA pullup allows direct connection to VIN via a 470-kΩ resistor for simple turn-on. EN also supports external UVLO using a resistor divider for programmable input voltage turn-on thresholds.
Is the LM22678TJ-ADJ/NOPB compatible with ceramic output capacitors?
Yes, the LM22678TJ-ADJ/NOPB is explicitly designed to be stable with low-ESR ceramic capacitors - including X7R and X5R MLCCs - eliminating the need for bulkier aluminum or tantalum types. This compatibility reduces board area, improves reliability, and enhances transient response. TI recommends ≥22-µF total ceramic output capacitance with appropriate voltage rating for optimal stability and ripple suppression.
LM22678TJ-ADJ/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:
- 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:
- 5A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-7 Thin
LM22678TJ-ADJ/NOPB FAQ
1.How can I place an order for LM22678TJ-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22678TJ-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 LM22678TJ-ADJ/NOPB reliable?
The price and inventory of LM22678TJ-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 LM22678TJ-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22678TJ-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22678TJ-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22678TJ-ADJ/NOPB?
LM22678TJ-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22678TJ-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 LM22678TJ-ADJ/NOPB?
For technical support, including LM22678TJ-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22678TJ-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22678TJ-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22678TJ-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 LM22678TJ-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22678TJ-ADJ/NOPB?
All LM22678TJ-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22678TJ-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 LM22678TJ-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22678TJ-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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