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Texas Instruments LM22678TJ-5.0/NOPB
- Part No.:
- LM22678TJ-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22678TJ-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 5A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:3,768
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Product details
Overview
LM22678TJ-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 junction temperature and delivers >90% efficiency in industrial power conversion applications.
For engineers reviewing the LM22678TJ-5.0/NOPB datasheet, LM22678TJ-5.0/NOPB pinout, LM22678TJ-5.0/NOPB application, or LM22678TJ-5.0/NOPB equivalent, key selection criteria include wide VIN range (4.5–42 V), internal compensation, precision enable threshold (1.6 V typ.), thermal shutdown (150°C), and PFM package thermal performance (RθJA = 22°C/W).
Technical Context
The LM22678TJ-5.0/NOPB implements voltage-mode PWM control with input voltage feedforward for stable loop gain across input variations. Its internal Type III compensation eliminates external compensation components and supports stable operation with low-ESR ceramic output capacitors.
It integrates a bootstrap diode, soft-start (500 µs typ.), and precision enable with 0.6-V hysteresis. The device enters current-foldback mode under severe overload (e.g., short-circuit), reducing switching frequency to ~100 kHz to limit inductor current runaway and maintain safe SOA boundaries.
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 rail generation. |
| Max Output Current | 5 A - sustains full load with proper PCB copper area and thermal management per RθJA = 22°C/W spec. |
| Switching Frequency | 500 kHz (±20%) - enables compact LC filter design with <10-µH inductors and low-profile ceramics. |
| MOSFET RDS(ON) | 100 mΩ (typ.) - limits conduction loss to ≤250 mW at 5 A, supporting >90% peak efficiency at mid-load. |
| Quiescent Current | 3.4 mA (typ.) - ensures low no-load power draw in always-on subsystems; drops to 25 µA in shutdown. |
| Junction Temp Range | –40°C to +125°C - qualified for industrial ambient environments and automotive under-hood proximity (non-Q1 variant). |
Pinout & Package
LM22678TJ-5.0/NOPB uses the TO-263-7 (PFM) package with 10.16 mm × 9.85 mm body size and exposed thermal pad (EP) that must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | High-current drain of internal N-MOSFET; connects to external inductor and bootstrap capacitor. |
| VIN | Input supply | Primary DC input (4.5–42 V); supplies gate driver and internal bias circuits. |
| GND | Power ground | Return path for switch current and internal circuitry; tied to EP for thermal conduction. |
| BOOT | Bootstrap supply | Drives high-side MOSFET gate via external 10-nF ceramic capacitor between BOOT and SW. |
| FB | Feedback input | Internally connected to 5-V reference divider; shorted to VOUT for fixed-output operation. |
| EN | Enable control | Logic-level ON/OFF control with 1.6-V threshold and 0.6-V hysteresis; supports precise power sequencing. |
| NC | No connect | Electrically isolated pin; functions only as thermal conductor to EP. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control | Eliminates external compensation network - reduces BOM count and layout sensitivity for robust transient response. |
| Integrated bootstrap diode | Removes need for external bootstrap diode - simplifies layout, improves reliability, and reduces footprint. |
| Fixed 5-V output option | Internal resistor divider sets VOUT = 5.0 V - avoids external FB resistors and associated tolerance/temperature drift errors. |
| 500-µs soft-start | Controls inrush current during startup - prevents input voltage sag and output overshoot without external timing components. |
| Thermal shutdown & current limit | 150°C trip point and 6.0–8.4-A peak current limit - protects against sustained overloads and PCB overheating without external sensing. |
Applications
| Industrial Distributed Power | Test & Measurement Equipment |
|---|---|
Use Scenario: Generating stable 5-V rails from 12–24-V factory bus systems powering PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5-V/5-A output with tight line/load regulation and low ripple. Use Value: High efficiency (>90%) minimizes heat buildup in enclosed cabinets; wide VIN accommodates brownout conditions without dropout. | Use Scenario: Supplying clean 5-V power to ADC front-ends, FPGA configuration circuits, and microcontroller subsystems in bench instruments. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter providing low-noise, well-regulated 5-V supply independent of input fluctuations. Use Value: ±1.5% reference accuracy ensures consistent analog measurement reference; 500-kHz switching enables effective EMI filtering. |
| Appliance Control Boards | General-Purpose Wide VIN Systems |
Use Scenario: Powering MCU, display drivers, and communication ICs on washing machine or HVAC main control boards fed from rectified AC or 24-V DC bus. IC Role / Device Role / Timing Role: Main system regulator converting unregulated DC input to reliable 5-V logic supply. Use Value: Precision enable pin allows synchronized startup with other rails; thermal protection prevents failure during extended high-ambient operation. | Use Scenario: Serving as universal 5-V source in field-deployable IoT gateways, remote telemetry units, and portable diagnostic tools operating from diverse inputs (12-V truck battery, 24-V solar, 42-V industrial). IC Role / Device Role / Timing Role: Single-chip step-down solution eliminating need for multiple discrete regulators or LDOs. Use Value: 42-V absolute max rating and –40°C to 125°C operation ensure compatibility across global deployment environments. |
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-5.0/NOPB | 3-A rated version; identical pinout, package, and feature set except lower current capability and higher RDS(ON) (150 mΩ). | Suitable where peak load ≤3 A; lower thermal stress but insufficient for 5-A continuous loads. | Select when system load is consistently below 3 A and board space/thermal budget is constrained. |
| LM61460PWRR | 6-A, 3–36-V input, lower quiescent current (26 µA), integrated EMI filters, and PFM/PWM hybrid mode. | Designed for ultra-low EMI and battery-powered applications; requires different layout and external compensation. | Choose for new designs prioritizing EMI compliance, standby power, or wider input flexibility - not drop-in compatible. |
Compared with LM22670TJ-5.0/NOPB, LM22678TJ-5.0/NOPB delivers 67% higher output current in the same footprint; compared with LM61460PWRR, it offers proven industrial reliability and simpler design-in at the cost of higher IQ and less EMI optimization.
Availability
LM22678TJ-5.0/NOPB is available at Aetrix Electronics and suitable for industrial distributed power, test and measurement equipment, and appliance control boards requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM22678TJ-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 technologies, with decades of expertise in high-reliability DC/DC conversion.
LM22678TJ-5.0/NOPB belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use in industrial and commercial power systems, emphasizing minimal external components, internal compensation, and WEBENCH®-enabled design acceleration.
FAQ
What is the maximum input voltage rating for LM22678TJ-5.0/NOPB?
The LM22678TJ-5.0/NOPB has an absolute maximum input voltage rating of 43 V, with recommended operating range from 4.5 V to 42 V. Exceeding 43 V risks permanent damage. Within the 4.5–42 V range, the device maintains full 5-A output capability, stable regulation, and thermal protection functionality across its –40°C to 125°C junction temperature range.
Does LM22678TJ-5.0/NOPB require external compensation components?
No, LM22678TJ-5.0/NOPB features fully internal Type III loop compensation optimized for fixed 5-V output. This eliminates the need for external compensation networks, reducing design complexity, BOM count, and sensitivity to parasitic layout effects - a key advantage over adjustable regulators like the LM22678-ADJ variant.
How is the 5-V output set on LM22678TJ-5.0/NOPB?
The LM22678TJ-5.0/NOPB uses an internal resistor divider to fix the output at 5.0 V. The FB pin is internally connected to this divider, so it must be shorted directly to the VOUT node - no external resistors are required. This architecture ensures ±1.5% output accuracy over temperature and line, avoiding tolerance drift inherent in external dividers.
What thermal management is required for LM22678TJ-5.0/NOPB at full 5-A load?
At 5-A continuous load, LM22678TJ-5.0/NOPB requires ≥1 square inch of 2-oz copper connected to the exposed pad (EP) to achieve the specified RθJA of 22°C/W. Without adequate copper area, junction temperature rise increases significantly - potentially triggering thermal shutdown. Thermal vias under the EP and multilayer board stacking are strongly recommended for sustained high-current operation.
Can LM22678TJ-5.0/NOPB be used in automotive applications?
The LM22678TJ-5.0/NOPB is not AEC-Q100 qualified. For automotive use, TI specifies the LM22678-Q1 variant, which is grade 1 qualified (–40°C to +125°C) and undergoes additional stress testing. While LM22678TJ-5.0/NOPB shares identical electrical specs and package, its qualification status and screening differ - making LM22678-Q1 the only TI-approved choice for automotive production systems.
LM22678TJ-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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-7 Thin
LM22678TJ-5.0/NOPB FAQ
1.How can I place an order for LM22678TJ-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22678TJ-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 LM22678TJ-5.0/NOPB reliable?
The price and inventory of LM22678TJ-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 LM22678TJ-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM22678TJ-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22678TJ-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22678TJ-5.0/NOPB?
LM22678TJ-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22678TJ-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 LM22678TJ-5.0/NOPB?
For technical support, including LM22678TJ-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22678TJ-5.0/NOPB requirements.
6.How does Aetrix verify that LM22678TJ-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22678TJ-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 LM22678TJ-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM22678TJ-5.0/NOPB?
All LM22678TJ-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22678TJ-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 LM22678TJ-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM22678TJ-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM22678TJ-5.0/NOPB Tags
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