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Texas Instruments LM22678QTJ-ADJ/NOPB
- Part No.:
- LM22678QTJ-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22678QTJ-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:2,149
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Product details
Overview
LM22678QTJ-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 switching frequency, ±1.5% feedback reference accuracy, and integrated 100-mΩ N-channel MOSFET. It delivers >90% efficiency in industrial power supplies requiring wide VIN and stable load regulation.
For engineers reviewing the LM22678QTJ-ADJ/NOPB datasheet, LM22678QTJ-ADJ/NOPB pinout, LM22678QTJ-ADJ/NOPB application, or LM22678QTJ-ADJ/NOPB equivalent, key selection criteria include its internally compensated voltage-mode control, precision enable threshold (1.6 V typ.), thermal shutdown at 150°C, soft-start time of 500 µs, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The LM22678QTJ-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward for stable loop gain across input variations. Its internal Type III compensation is optimized for output voltages ≤5 V, eliminating external compensation components.
It integrates a bootstrap diode and gate driver for high-side N-FET operation, requires only a 10-nF ceramic capacitor between BOOT and SW, and enforces minimum on-time (100 ns) and off-time (200 ns) to ensure reliable current sensing and bootstrap recharge under all operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports 24-V and 36-V industrial bus rails without pre-regulation |
| Output Current | Up to 5 A - sustains full load at TJ ≤ 125°C with proper PCB copper thermal management |
| Feedback Reference | 1.285 V (typ), ±1.5% - sets minimum adjustable output and defines resistor-divider ratio for precise VOUT |
| Switching Frequency | 500 kHz (±20%) - enables compact magnetics and good transient response without EMI filter overdesign |
| RDS(ON) | 0.1 Ω (typ) - limits conduction loss to <250 mW at 5 A, supporting >90% peak efficiency |
| Quiescent Current | 3.4 mA (typ) - maintains regulation during active operation while minimizing no-load power draw |
| Standby Current | 25 µA (typ) - enables ultra-low-power shutdown for battery-backed or energy-sensitive systems |
| Junction Temp Range | –40°C to +125°C - qualified for extended industrial and automotive under-hood environments |
Pinout & Package
LM22678QTJ-ADJ/NOPB uses the PFM (TO-263-7) package with an exposed thermal pad (EP) that must be soldered to a GND-connected PCB copper area for thermal performance. The 7-pin layout includes dedicated BOOT, FB, EN, SW, VIN, and GND terminals plus one NC pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Drives external inductor; swings from ~0 V to VIN; requires low-inductance routing to minimize EMI |
| VIN | Main input supply | Connects to bulk input capacitor; must withstand up to 43 V absolute max rating |
| GND | Power ground | Reference for all internal circuits; ties to EP for thermal path and noise control |
| BOOT | Bootstrap supply | Connects via 10-nF ceramic cap to SW; powers high-side gate driver; critical for MOSFET turn-on |
| FB | Feedback input | Senses output via resistor divider; 230 nA bias current affects high-resistor-divider accuracy |
| EN | Enable control | Logic-level input with 1.6 V threshold and 0.6 V hysteresis; internal 6 µA pullup allows simple VIN tie |
| NC | No connect | Not electrically bonded; functions as thermal conductor only - must not be routed to signal nets |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control | Eliminates external compensation network - reduces BOM count and design iteration time for 1.285–5 V outputs |
| Integrated bootstrap diode | Removes need for external bootstrap diode - simplifies layout and improves reliability in high-duty-cycle applications |
| Precision enable with hysteresis | Enables clean power sequencing and external UVLO implementation using resistor dividers from other rails |
| Built-in soft-start | Fixed 500 µs ramp prevents inrush current and output overshoot - no external capacitor required |
| Thermal shutdown & current limit | Protects against sustained overload or poor heatsinking; trips at 150°C junction temp and 6–8.4 A peak switch current |
| Stable with ceramic capacitors | Supports low-ESR MLCCs - avoids large, costly electrolytics and improves long-term reliability |
Applications
| Industrial Power Supply | Test Equipment Rail |
|---|---|
Use Scenario: Distributed 24-V bus powering multiple isolated 3.3-V/5-V logic rails in PLC backplanes or motor drives. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering regulated 3.3 V at up to 5 A with tight line/load regulation. Use Value: Wide 4.5–42-V input range accommodates brownout and surge conditions; 500-kHz switching enables small 2.2-µH inductors and 22-µF ceramic output caps. | Use Scenario: Programmable power supply module generating stable 12-V and 15-V analog rails for oscilloscope front-ends and signal generators. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for 12 V using FB divider; provides low-noise, low-ripple DC source. Use Value: ±1.5% reference accuracy ensures rail stability across temperature; precision enable allows synchronized startup with FPGA or microcontroller. |
| Appliance Control Board | General-Purpose Wide VIN |
Use Scenario: Main system power for smart washing machine control boards powered from rectified AC mains (≈32 V DC). IC Role / Device Role / Timing Role: High-voltage buck converter stepping down to 5 V for MCU, display, and sensor interfaces. Use Value: 42-V absolute max rating tolerates line transients; integrated thermal shutdown prevents failure during vent fan stall or heater fault events. | Use Scenario: Universal input DC/DC stage in portable diagnostic tools accepting 12–36-V vehicle batteries or wall adapters. IC Role / Device Role / Timing Role: Single-stage buck regulator delivering 3.3 V for ARM Cortex-M7 SoC and peripherals. Use Value: –40°C to +125°C operation supports cold-cranking and under-hood deployment; 25 µA standby current extends battery life in sleep mode. |
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-ADJ/NOPB | Same electrical specs; TO-263-7 package without exposed pad (non-thermal-enhanced) | Limited to lower ambient temps or reduced load currents due to higher RθJA (~35°C/W vs 22°C/W) | Select when thermal budget permits and cost sensitivity outweighs thermal margin needs |
| LM61460PWRR | 3–36-V input, 6-A, synchronous, lower IQ (26 µA), improved EMI via spread-spectrum and pin-strapping | Requires different compensation and layout; not drop-in - designed for next-gen low-EMI, high-efficiency systems | Choose for new designs prioritizing EMI compliance, ultra-low standby, or higher current headroom |
Compared with LM22678QTJ-ADJ/NOPB, LM22678TJ-ADJ/NOPB trades thermal performance for lower cost in less demanding environments, while LM61460PWRR offers superior EMI behavior and efficiency but requires redesign effort and lacks direct pin compatibility.
Availability
LM22678QTJ-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial distributed power, test equipment, appliance control, and general-purpose wide VIN applications requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for LM22678QTJ-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 ICs, with decades of expertise in high-reliability power conversion solutions.
LM22678QTJ-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use in high-input-voltage buck applications where minimal external components, internal compensation, and robust thermal protection are essential.
FAQ
What is the minimum output voltage supported by the LM22678QTJ-ADJ/NOPB?
The LM22678QTJ-ADJ/NOPB supports a minimum output voltage of 1.285 V (typical), set by its internal feedback reference voltage. This value is specified over temperature (–40°C to +125°C) with ±1.5% accuracy, enabling precise low-voltage rail generation for modern MCUs and FPGAs without external reference circuitry.
Does the LM22678QTJ-ADJ/NOPB require an external bootstrap diode?
No, the LM22678QTJ-ADJ/NOPB integrates a bootstrap diode internally. This eliminates the need for an external diode between VIN and BOOT, simplifying layout and improving reliability. A 10-nF ceramic capacitor must still be placed between BOOT and SW, with short, low-inductance traces, to ensure proper high-side gate drive.
What is the thermal resistance (RθJA) of the LM22678QTJ-ADJ/NOPB package?
The LM22678QTJ-ADJ/NOPB in its PFM (TO-263-7) package has a junction-to-ambient thermal resistance (RθJA) of 22°C/W when mounted on 1 square inch of 2-oz copper. Actual RθJA varies between 20–30°C/W depending on PCB copper area and layer stack-up - adequate thermal design is required to sustain 5-A output at +125°C junction temperature.
Can the LM22678QTJ-ADJ/NOPB operate with ceramic output capacitors?
Yes, the LM22678QTJ-ADJ/NOPB is explicitly designed to be stable with low-ESR ceramic capacitors. Its internally compensated voltage-mode architecture eliminates the need for high-ESR electrolytic or tantalum capacitors, reducing size, cost, and aging-related failure risks in long-life industrial applications.
What happens to the LM22678QTJ-ADJ/NOPB during an output short-circuit condition?
During an output short, the LM22678QTJ-ADJ/NOPB enters current-limit foldback mode: switching frequency drops to ~100 kHz (1/5 nominal), peak switch current is clamped at 6–8.4 A, and output voltage collapses. Thermal shutdown activates if junction temperature exceeds 150°C. Recovery requires load removal and cooldown below ~135°C before automatic restart.
LM22678QTJ-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
LM22678QTJ-ADJ/NOPB FAQ
1.How can I place an order for LM22678QTJ-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22678QTJ-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 LM22678QTJ-ADJ/NOPB reliable?
The price and inventory of LM22678QTJ-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 LM22678QTJ-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22678QTJ-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22678QTJ-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22678QTJ-ADJ/NOPB?
LM22678QTJ-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22678QTJ-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 LM22678QTJ-ADJ/NOPB?
For technical support, including LM22678QTJ-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22678QTJ-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22678QTJ-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22678QTJ-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 LM22678QTJ-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22678QTJ-ADJ/NOPB?
All LM22678QTJ-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22678QTJ-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 LM22678QTJ-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22678QTJ-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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