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Texas Instruments LM22678QTJE-ADJ/NOPB
- Part No.:
- LM22678QTJE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22678QTJE-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:560
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Product details
Overview
LM22678QTJE-ADJ/NOPB from Texas Instruments is a 42-V input, 5-A synchronous step-down DC/DC regulator in a thermally enhanced TO-263-7 (PFM) package, featuring internally compensated voltage-mode control, 500-kHz fixed switching frequency, ±1.5% feedback reference accuracy, and adjustable output down to 1.285 V. It integrates a 100-mΩ N-channel MOSFET, precision enable pin, integrated bootstrap diode, and soft-start for industrial power conversion.
For engineers reviewing the LM22678QTJE-ADJ/NOPB datasheet, LM22678QTJE-ADJ/NOPB pinout, LM22678QTJE-ADJ/NOPB application, or LM22678QTJE-ADJ/NOPB equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation value, and two confirmed alternative regulators with documented functional distinctions.
Technical Context
The LM22678QTJE-ADJ/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 stable operation with ceramic output capacitors and eliminating external compensation components. Its internal Type III compensation is optimized for output voltages ≤5 V.
It integrates a high-side N-channel MOSFET (RDS(ON) = 0.1 Ω typ), bootstrap circuitry requiring a 10-nF ceramic capacitor between BOOT and SW, and precision enable logic with 1.6-V threshold and 0.6-V hysteresis. Thermal shutdown activates at 150°C, and current limiting trips at 6.0–8.4 A depending on junction temperature.
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 Current | Up to 5 A continuous - sufficient for FPGA core rails, motor drivers, and multi-rail embedded systems. |
| Feedback Reference | 1.285 V ±1.5% - enables precise adjustable outputs from 1.285 V to >42 V via external resistor divider. |
| Switching Frequency | 500 kHz (±20%) - balances small magnetics size and EMI performance; minimum on/off times constrain VIN/VOUT ratios. |
| RDS(ON) | 0.1 Ω typical - reduces conduction loss at full load, supporting >90% peak efficiency in typical 12 V → 3.3 V designs. |
| Quiescent Current | 3.4 mA active, 25 µA standby - enables low-power sleep modes in always-on industrial controllers. |
| Junction Temp Range | –40°C to +125°C - qualified for extended-temperature industrial and automotive under-hood applications. |
Pinout & Package
LM22678QTJE-ADJ/NOPB uses a TO-263-7 (PFM) package with 10.16 mm × 9.85 mm body and exposed thermal pad (EP) that must be soldered to PCB ground for thermal management and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | High-frequency drain connection of internal N-MOSFET; requires low-inductance layout to minimize EMI and ringing. |
| VIN (Pin 2) | Main input supply | Connects to bulk input capacitor; handles up to 42 V and full 5-A ripple current during switching. |
| BOOT (Pin 3) | Bootstrap supply | Drives high-side gate via external 10-nF ceramic cap to SW; minimum off-time ensures recharge under all loads ≥5 mA. |
| GND (Pin 4) | Power ground | Primary return path for switch current and IC bias; must be tied directly to EP and input/output capacitor grounds. |
| NC (Pin 5) | No connect | Internally unconnected; serves as thermal conductor only-must not be used for signal routing or grounding. |
| FB (Pin 6) | Feedback input | Senses output voltage via external resistor divider; 230 nA bias current enables high-value dividers for low quiescent loss. |
| EN (Pin 7) | Enable control | Logic-level ON/OFF control with 1.6-V threshold and 0.6-V hysteresis; internal 6-µA pullup allows direct VIN tie via 470-kΩ resistor. |
| EP (Exposed Pad) | Thermal & ground terminal | Must be soldered to ≥1 in² copper pour connected to GND; provides dominant thermal path (RθJA = 22°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control | Eliminates external compensation network-reduces BOM count and design iteration time for standard buck topologies. |
| Integrated bootstrap diode | Removes need for external bootstrap diode, simplifying layout and improving reliability in high-duty-cycle applications. |
| 500-µs fixed soft-start | Prevents inrush current and output overshoot during power-up; no external capacitor required for timing control. |
| Stable with ceramic capacitors | Enables use of low-ESR, high-reliability MLCCs instead of electrolytics-reducing footprint and extending lifetime. |
| WEBENCH® enabled | Supports full online design-including component selection, thermal simulation, and Build-It board generation-directly from TI's tool. |
Applications
| Industrial Power Supply | Test Equipment Rail |
|---|---|
|
Use Scenario: Distributed 24-V or 42-V bus powering programmable logic controllers (PLCs) and I/O modules. IC Role / Device Role / Timing Role: Primary step-down regulator delivering stable 3.3 V or 5 V to microcontrollers and communication interfaces. Use Value: Wide VIN range accommodates fluctuating industrial bus voltages; 125°C rating ensures reliability in enclosed cabinets. |
Use Scenario: Precision bench power supplies and automated test equipment requiring clean, stable auxiliary rails. IC Role / Device Role / Timing Role: Secondary regulation stage converting bulk 12 V or 24 V to low-noise 1.8 V or 2.5 V for ADC/DAC references. Use Value: ±1.5% reference accuracy and low output impedance support <10 mV total error budgets in metrology-grade instruments. |
| Appliance Control Board | General-Purpose Wide-VIN System |
|
Use Scenario: Smart home appliances (ovens, washing machines) with variable battery or rectified AC input. IC Role / Device Role / Timing Role: Main system regulator supplying 5 V to MCU, display, and sensor interface circuits. Use Value: Integrated thermal shutdown and current limit protect against fault conditions in unattended consumer environments. |
Use Scenario: Field-deployable IoT gateways and edge nodes powered by solar, PoE++, or vehicle batteries. IC Role / Device Role / Timing Role: Input-flexible primary DC/DC converter handling 9–36 V nominal inputs with transient tolerance to 42 V. Use Value: 500-kHz switching enables compact 2-layer PCB designs; PFM package supports natural convection cooling without heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22677TJE-ADJ/NOPB | Same pinout and features but rated for 40-V max input (vs. 42 V); identical 5-A capability and 500-kHz frequency. | Limited to lower-voltage industrial buses (e.g., 28 V aircraft); not suitable for 42-V automotive transients per ISO 7637-2. | Select when input never exceeds 40 V and cost sensitivity outweighs 2-V margin; verify UVLO thresholds match system requirements. |
| LM61460QWRNQRQ1 | 3–36-V input, 6-A output, synchronous, PFM/PWM mode, lower IQ (26 µA), improved EMI via spread-spectrum clocking. | Not pin-compatible; requires new layout; superior for automotive infotainment and ADAS where EMI compliance is critical. | Choose for next-gen designs needing lower standby power, tighter EMI margins, or higher current-accepting redesign effort. |
Compared with LM22678QTJE-ADJ/NOPB, LM22677TJE-ADJ/NOPB offers identical functionality at reduced voltage rating and cost, while LM61460QWRNQRQ1 delivers higher integration and EMI performance at the expense of layout compatibility and increased complexity.
Availability
LM22678QTJE-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial distributed power, test and measurement instrumentation, and appliance control systems requiring stable component supply across long product lifecycles.
Supply support for LM22678QTJE-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, serving industrial, automotive, and communications markets since 1930.
The LM22678QTJE-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 LM22678QTJE-ADJ/NOPB?
The LM22678QTJE-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, enabling precise low-voltage rails for modern microcontrollers and FPGAs. The actual output is determined by the external resistor divider connected to the FB pin, and the device remains stable with ceramic capacitors down to this voltage level.
Does the LM22678QTJE-ADJ/NOPB require an external bootstrap diode?
No, the LM22678QTJE-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component. This simplifies layout and improves reliability in high-duty-cycle applications. A 10-nF ceramic capacitor must still be placed between the BOOT and SW pins with short, low-inductance traces to ensure proper gate drive voltage for the internal N-channel MOSFET.
What thermal management is required for the LM22678QTJE-ADJ/NOPB in continuous 5-A operation?
For continuous 5-A operation, the LM22678QTJE-ADJ/NOPB requires its exposed thermal pad (EP) to be soldered to ≥1 in² of PCB copper connected to ground. With this layout, its junction-to-ambient thermal resistance is 22°C/W. At full load and 42-V input, thermal simulation shows junction temperatures remain below 125°C in still air-no heatsink needed. Reducing copper area increases RθJA and risks thermal shutdown.
Can the LM22678QTJE-ADJ/NOPB be used in automotive applications?
The LM22678QTJE-ADJ/NOPB itself is not AEC-Q100 qualified; however, its automotive-grade variant LM22678Q1TJE-ADJ/NOPB is grade 1 qualified (–40°C to +125°C). For non-safety-critical automotive subsystems like infotainment or body electronics where qualification is not mandated, the LM22678QTJE-ADJ/NOPB may be used-but TI recommends the Q1 version for production automotive designs requiring formal qualification.
How does the enable pin (EN) function on the LM22678QTJE-ADJ/NOPB?
The EN pin on the LM22678QTJE-ADJ/NOPB provides precision ON/OFF control with a 1.6-V typical threshold and 0.6-V hysteresis. Pulling EN below 1.3 V disables the regulator, reducing input current to 25 µA typical. An internal 6-µA pullup allows direct connection to VIN via a 470-kΩ resistor for simple turn-on. Voltages above 6 V are prohibited-external resistive dividers or zener clamping may be needed for high-VIN sequencing.
LM22678QTJE-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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-7 Thin
LM22678QTJE-ADJ/NOPB FAQ
1.How can I place an order for LM22678QTJE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22678QTJE-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 LM22678QTJE-ADJ/NOPB reliable?
The price and inventory of LM22678QTJE-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 LM22678QTJE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22678QTJE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22678QTJE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22678QTJE-ADJ/NOPB?
LM22678QTJE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22678QTJE-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 LM22678QTJE-ADJ/NOPB?
For technical support, including LM22678QTJE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22678QTJE-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22678QTJE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22678QTJE-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 LM22678QTJE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22678QTJE-ADJ/NOPB?
All LM22678QTJE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22678QTJE-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 LM22678QTJE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22678QTJE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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