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Texas Instruments LM22678TJE-ADJ/NOPB
- Part No.:
- LM22678TJE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22678TJE-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:648
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Product details
Overview
LM22678TJE-ADJ/NOPB from Texas Instruments is a 42-V input, 5-A synchronous step-down DC/DC regulator in a TO-263-7 (PFM) package, featuring internally compensated voltage-mode control, 500-kHz fixed switching frequency, ±1.5% feedback reference accuracy, and integrated bootstrap diode and soft-start. It delivers up to 5 A at adjustable output voltages as low as 1.285 V and is used in industrial power supplies requiring wide VIN and high reliability.
For engineers reviewing the LM22678TJE-ADJ/NOPB datasheet, LM22678TJE-ADJ/NOPB pinout, LM22678TJE-ADJ/NOPB application, or LM22678TJE-ADJ/NOPB equivalent, key selection criteria include its 4.5–42 V input range, 100-mΩ N-channel MOSFET, thermal shutdown at 150°C, precision enable threshold (1.6 V typ), and compatibility with low-ESR ceramic output capacitors.
Technical Context
The LM22678TJE-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward for stable loop gain across input variations, enabling optimized transient response without external compensation. Its internal Type III compensation is tuned for outputs ≤5 V, and it uses a floating high-side gate driver powered by an external BOOT-to-SW capacitor.
It integrates critical protection features including cycle-by-cycle current limiting (6.0–8.4 A), thermal shutdown at 150°C, undervoltage lockout (UVLO rising threshold 4.3 V), and precision enable with 0.6 V hysteresis - all supporting robust operation in demanding industrial environments.
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 powering FPGAs, microcontrollers, and analog subsystems from single-stage conversion. |
| Switching Frequency | 500 kHz (±20%) - enables compact magnetics and good transient response while avoiding AM radio band interference. |
| Feedback Accuracy | ±1.5% over –40°C to +125°C - ensures tight output regulation across full operating temperature range. |
| RDS(ON) | 0.10 Ω (typ) - minimizes conduction loss and improves efficiency (>90% typical at mid-load). |
| Quiescent Current | 3.4 mA (active), 25 µA (shutdown) - balances light-load efficiency and fast wake-up capability. |
| Soft-Start Time | 500 µs (fixed) - prevents inrush current and eliminates need for external timing components. |
| Junction Temp Range | –40°C to +125°C - qualified for industrial and extended-temperature applications without derating. |
Pinout & Package
LM22678TJE-ADJ/NOPB is housed in a thermally enhanced TO-263-7 (PFM) package (10.16 mm × 9.85 mm) with exposed pad for direct PCB grounding and improved thermal dissipation (RθJA = 22°C/W with 1 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Drives external inductor; swings between GND and VIN; requires low-inductance layout for EMI control. |
| VIN | Power input | Accepts 4.5–42 V; must be bypassed with low-ESR ceramic capacitor near pin. |
| GND | Ground reference | System ground return; connects to exposed pad for thermal and electrical integrity. |
| BOOT | Bootstrap supply | Supplies gate drive for high-side MOSFET; requires 10-nF ceramic capacitor to SW with short traces. |
| FB | Feedback input | Senses output via resistor divider; sets regulated voltage (1.285 V reference); bias current 230 nA. |
| EN | Enable control | Logic-level ON/OFF control; 1.6 V threshold with 0.6 V hysteresis; internal 6 µA pullup. |
| NC | No connect | Not electrically bonded; functions only as thermal conductor for exposed-pad mounting. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control | Eliminates external compensation network - reduces BOM count and design iteration time for stable 5-A buck designs. |
| 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 - avoids brownout during startup. |
| Stable with ceramic capacitors | Supports low-ESR, high-frequency ceramic output caps - reduces solution size and cost vs. electrolytic/tantalum alternatives. |
| WEBENCH® enabled | Full parametric design support in TI's online tool - includes component selection, thermal simulation, and Build-It board generation. |
| Thermal shutdown & current limit | Protects against overload and overheating - shuts down at 150°C and limits peak switch current to 6–8.4 A. |
Applications
| Industrial Distributed Power | Test & Measurement Equipment |
|---|---|
Use Scenario: Powering PLC I/O modules and sensor interfaces from unregulated 24-V rail with variable load transients. IC Role / Device Role / Timing Role: Primary 5-A buck regulator delivering stable 3.3 V or 5 V to digital logic and analog front-ends. Use Value: Wide 4.5–42 V input handles brownouts and surges; 500-kHz switching enables small 2.2-µH inductors and <1000-µF ceramic output capacitance. | Use Scenario: Supplying isolated ADCs, DACs, and FPGA configuration rails in portable bench instruments. IC Role / Device Role / Timing Role: High-efficiency, low-noise intermediate regulator stepping down 12–36 V battery or adapter input to 1.8 V/3.3 V. Use Value: ±1.5% feedback accuracy maintains measurement integrity; soft-start prevents system reset during power-on. |
| Appliance Control Boards | General-Purpose Wide VIN Systems |
Use Scenario: Providing main 5-V and auxiliary 3.3-V rails on washing machine or HVAC control boards with 12–42 V DC bus. IC Role / Device Role / Timing Role: Main DC/DC converter powering MCU, display drivers, and communication ICs. Use Value: TO-263 thermal pad enables reliable operation in enclosed, high-ambient-temperature enclosures without heatsinks. | Use Scenario: Powering embedded gateways, IoT edge nodes, and fieldbus repeaters with varying input sources (solar, battery, PoE+). IC Role / Device Role / Timing Role: Single-chip buck solution replacing multi-stage linear or discrete switching regulators. Use Value: 25-µA shutdown current extends battery life; precision enable allows coordinated wake-up with host processor. |
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 | 3-A output rating, same package and pinout, identical control architecture but lower current capability. | Suitable for <3-A loads where thermal margin or cost reduction is prioritized over headroom. | Select when full 5-A capability is unnecessary and smaller inductor/capacitor sizing is acceptable. |
| LM61460PWPR | 6-A output, 3–36 V input, synchronous rectification, lower quiescent current (15 µA), and improved EMI performance via spread-spectrum. | Better suited for next-gen designs requiring higher efficiency, lower standby power, or stricter EMC compliance. | Choose for new designs targeting >92% efficiency at light load or needing automotive-grade EMI robustness. |
Compared with LM22678TJE-ADJ/NOPB, LM22677TJE-ADJ/NOPB offers reduced current capacity in identical form factor, while LM61460PWPR provides higher performance with different pinout and package - neither is pin-compatible, but both address overlapping wide-VIN buck use cases with distinct trade-offs in current, efficiency, and integration.
Availability
LM22678TJE-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial distributed power, test and measurement equipment, and appliance control boards requiring stable component supply and long-term manufacturability.
Supply support for LM22678TJE-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 decades of expertise in high-reliability power conversion ICs.
LM22678TJE-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use in wide-input, medium-current DC/DC applications, emphasizing minimal external components, internal compensation, and WEBENCH® design integration.
FAQ
What is the minimum output voltage supported by LM22678TJE-ADJ/NOPB?
The LM22678TJE-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 and is confirmed in the Electrical Characteristics table under VFB for the -ADJ version. The regulator achieves this using an external resistor divider connected to the FB pin, with recommended RFBB = 1 kΩ for noise immunity and minimum load provision.
Does LM22678TJE-ADJ/NOPB require an external bootstrap diode?
No, LM22678TJE-ADJ/NOPB does not require an external bootstrap diode because it integrates one internally. This is explicitly stated in the Features section and confirmed in Section 7.3.3 of the datasheet. The internal bootstrap diode charges the external 10-nF ceramic capacitor between BOOT and SW pins each cycle, eliminating a common discrete component and improving reliability in high-duty-cycle operation.
What is the thermal resistance (RθJA) of LM22678TJE-ADJ/NOPB in its TO-263 package?
The junction-to-ambient thermal resistance (RθJA) of LM22678TJE-ADJ/NOPB is 22°C/W when mounted on 1 square inch of 2-oz copper PCB, as specified in Section 6.5. This value assumes optimal thermal layout; actual RθJA may range from 20 to 30°C/W depending on PCB copper area and via count to internal planes. The exposed pad must be soldered directly to GND for effective heat transfer.
Can LM22678TJE-ADJ/NOPB operate with input voltages below 4.5 V?
No, LM22678TJE-ADJ/NOPB is not rated for continuous operation below 4.5 V input. Its Recommended Operating Conditions specify a minimum VIN of 4.5 V, and its internal undervoltage lockout (UVLO) has a falling threshold of 3.9 V (typ). Attempting to operate below 4.5 V risks unstable regulation, failure to start, or undefined behavior - especially near the UVLO hysteresis band.
Is LM22678TJE-ADJ/NOPB pin-compatible with LM22678-5.0 variants?
Yes, LM22678TJE-ADJ/NOPB is pin-compatible with LM22678-5.0 variants, including LM22678TJE-5.0/NOPB. Both share identical TO-263-7 (PFM) packaging, pin configuration (SW, VIN, GND, BOOT, FB, EN, NC), and mechanical footprint. The only functional difference is the feedback configuration: -ADJ uses external resistors to set output voltage, while -5.0 has internal 5-V regulation and ties FB directly to VOUT.
LM22678TJE-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
LM22678TJE-ADJ/NOPB FAQ
1.How can I place an order for LM22678TJE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22678TJE-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 LM22678TJE-ADJ/NOPB reliable?
The price and inventory of LM22678TJE-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 LM22678TJE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22678TJE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22678TJE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22678TJE-ADJ/NOPB?
LM22678TJE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22678TJE-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 LM22678TJE-ADJ/NOPB?
For technical support, including LM22678TJE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22678TJE-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22678TJE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22678TJE-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 LM22678TJE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22678TJE-ADJ/NOPB?
All LM22678TJE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22678TJE-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 LM22678TJE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22678TJE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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