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Texas Instruments LM22679TJ-ADJ/NOPB
- Part No.:
- LM22679TJ-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22679TJ-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,472
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Product details
Overview
LM22679TJ-ADJ/NOPB from Texas Instruments is a 42-V input, 5-A synchronous step-down DC/DC regulator in TO-263-7 (PFM) package, featuring voltage-mode PWM control, internal loop compensation, and adjustable output down to 1.285 V. It integrates a 100-mΩ N-channel MOSFET switch and supports industrial power conversion with >90% efficiency at full load.
For engineers reviewing the LM22679TJ-ADJ/NOPB datasheet, LM22679TJ-ADJ/NOPB pinout, LM22679TJ-ADJ/NOPB application, or LM22679TJ-ADJ/NOPB equivalent, key selection criteria include its 500-kHz fixed switching frequency, ±1.5% feedback reference accuracy, adjustable current limit via IADJ pin, thermal shutdown at 150°C, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The LM22679TJ-ADJ/NOPB implements a voltage-mode PWM architecture with input voltage feedforward to stabilize loop gain across wide VIN ranges (4.5 V to 42 V). Its internal Type III compensation is optimized for output voltages ≤5 V, eliminating external compensation components.
It features a bootstrap gate driver for the integrated high-side MOSFET, requiring a 10-nF ceramic capacitor between BOOT and SW pins. Minimum on-time (100 ns) and off-time (200 ns) constrain duty-cycle limits, enabling stable operation down to 1.285 V output while supporting high VIN:VOUT ratios.
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 - delivers full rated load with internal 100-mΩ N-channel MOSFET and thermal shutdown at 150°C. |
| Feedback Reference | 1.285 V (typ), ±1.5% - enables precise adjustable output down to 1.285 V using external resistor divider on FB pin. |
| Switching Frequency | 500 kHz (±20%) - allows compact magnetics and input/output filtering; stable over –40°C to 125°C junction range. |
| Current Limit | 7.1 A (typ), adjustable via IADJ pin - programmable peak switch current using single external resistor (30–100 kΩ range). |
| Soft-Start Time | Adjustable via SS pin capacitor (100 nF–1 µF) - extends startup ramp to reduce inrush stress; default ~500 µs. |
| Quiescent Current | 3.4 mA (typ) - low standby draw suitable for always-on industrial subsystems. |
Pinout & Package
LM22679TJ-ADJ/NOPB uses the TO-263-7 (NDP/PFM) thermally enhanced package with exposed pad (EP), measuring 10.16 mm × 9.85 mm. The exposed pad must be soldered to PCB ground plane for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch Node Output | Drives external inductor; swings from GND to VIN; connects to cathode of Schottky catch diode. |
| VIN | Main Input Supply | Accepts 4.5–42 V; powers internal bias circuitry and high-side gate driver via bootstrap network. |
| BOOT | Bootstrap Capacitor Terminal | Connects to 10-nF ceramic cap between BOOT and SW; supplies floating gate drive for high-side MOSFET. |
| GND | Power Ground | System return path for input, output, and internal logic; ties to exposed pad for thermal conduction. |
| IADJ | Current Limit Adjust Input | Resistor-to-GND sets peak switch current (default 7.1 A); floating = factory default setting. |
| FB | Feedback Input | High-impedance (230 nA bias) node sensing output voltage divider; regulates VOUT to 1.285 V reference. |
| SS | Soft-Start Control | Capacitor-to-GND extends startup ramp time linearly (TSS ≈ 26 ms/µF); resets on UVLO or thermal shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates external compensation network; simplifies design for 1.285–5 V outputs with guaranteed stability. |
| Integrated bootstrap diode | Reduces external component count; enables self-powered high-side gate drive without discrete diode. |
| Adjustable current limit via single resistor | Enables optimization of inductor and diode ratings for cost/space-constrained applications without derating. |
| Stable with low-ESR ceramic capacitors | Supports MLCC-based output filtering - reduces board area, improves transient response, and avoids tantalum reliability risks. |
| WEBENCH® enabled | Full online design support including BOM generation, thermal simulation, and Build-It board prototyping. |
Applications
| Industrial Distributed Power | Test & Measurement Equipment |
|---|---|
Use Scenario: Converting 24-V or 42-V bus to 3.3-V/5-V rails for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5-A output with tight line/load regulation and fast transient recovery. Use Value: High efficiency (>90%) minimizes heat buildup in enclosed cabinets; 42-V max input withstands industrial surge transients per IEC 61000-4-5. |
Use Scenario: Powering precision ADCs, DACs, and FPGA core rails in portable bench instruments. IC Role / Device Role / Timing Role: Low-noise, adjustable-output supply with soft-start to prevent measurement corruption during power-up. Use Value: ±1.5% reference accuracy ensures stable analog reference voltage; 500-kHz switching enables small, low-profile filter inductors. |
| Appliance Control Boards | General-Purpose Wide-VIN Systems |
Use Scenario: Providing 3.3-V logic supply from variable AC/DC adapter or battery input in smart home hubs. IC Role / Device Role / Timing Role: Robust primary DC/DC converter with thermal shutdown and cycle-by-cycle current limiting. Use Value: Adjustable current limit protects against motor stall faults; exposed pad enhances thermal dissipation in plastic enclosures. |
Use Scenario: Universal input (12–42 V) power stage for field-deployable IoT gateways and edge controllers. IC Role / Device Role / Timing Role: Flexible buck regulator supporting multiple output voltages via FB divider configuration. Use Value: Internal compensation and wide VIN range eliminate need for input pre-regulators or custom compensation tuning. |
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 pinout and package; lower 3-A output rating; identical 1.285-V reference and 500-kHz frequency. | 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 solution size is acceptable. |
| LM61460PWRR | Higher efficiency (up to 96%), lower IQ (26 µA), PFM mode at light load, and improved EMI performance. | Preferred for battery-powered or noise-sensitive applications requiring ultra-low standby power and CISPR-25 compliance. | Choose for next-gen designs demanding higher efficiency, lower quiescent current, and reduced EMI without layout change. |
Compared with LM22679TJ-ADJ/NOPB, LM22678TJ-ADJ/NOPB offers reduced current capability but identical interface and compensation, while LM61460PWRR provides superior efficiency and EMI performance at the cost of different pinout and control architecture - neither is pin-compatible, but both serve overlapping wide-VIN buck use cases.
Availability
LM22679TJ-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 across extended temperature and voltage ranges.
Supply support for LM22679TJ-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.
LM22679TJ-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - designed for ease-of-use in wide-input industrial and automotive applications, minimizing external components and enabling rapid design-in via WEBENCH® tools.
FAQ
What is the minimum output voltage supported by LM22679TJ-ADJ/NOPB?
The LM22679TJ-ADJ/NOPB supports a minimum output voltage of 1.285 V (typical), set by its internal feedback reference voltage. This value is specified over the full operating temperature range (–40°C to 125°C) with ±1.5% accuracy. Output voltage is adjusted using an external resistor divider connected to the FB pin, and the device remains stable with ceramic output capacitors down to this minimum level.
Does LM22679TJ-ADJ/NOPB require an external bootstrap diode?
No, LM22679TJ-ADJ/NOPB integrates a bootstrap diode internally. It only requires a 10-nF ceramic capacitor connected between the BOOT and SW pins to provide gate drive for the internal high-side N-channel MOSFET. Adding an external diode is unnecessary and may interfere with proper bootstrap capacitor charging during minimum off-time intervals.
How is current limit adjusted on LM22679TJ-ADJ/NOPB?
Current limit on LM22679TJ-ADJ/NOPB is adjusted by connecting a resistor between the IADJ pin and GND. The default current limit is 7.1 A (typ) when IADJ is left floating. With a resistor, the current limit scales inversely - e.g., a 49.9-kΩ resistor sets ~5 A limit. Accuracy degrades to +35%/–25% versus the factory default, and resistor values must stay within 30–100 kΩ per Figure 7-3 in the datasheet.
What package type does LM22679TJ-ADJ/NOPB use, and how is thermal performance managed?
LM22679TJ-ADJ/NOPB uses the TO-263-7 (NDP/PFM) package with an exposed thermal pad (EP). For optimal thermal performance, the EP must be soldered to a large PCB copper area connected to system ground. With 1 in² of 2-oz copper, junction-to-ambient thermal resistance (RθJA) is 22°C/W. Thermal shutdown activates at ~150°C, and the device resumes operation after junction temperature drops below ~135°C.
Can LM22679TJ-ADJ/NOPB operate with input voltages below 4.5 V?
No, LM22679TJ-ADJ/NOPB has a recommended minimum input voltage of 4.5 V and an undervoltage lockout (UVLO) rising threshold of 4.3 V (typ). Operation below 4.5 V violates recommended conditions and may result in unstable regulation, failure to start, or undefined behavior. The absolute maximum rating for VIN is 43 V, and the device is fully specified from 4.5 V to 42 V across –40°C to 125°C junction temperature.
LM22679TJ-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
LM22679TJ-ADJ/NOPB FAQ
1.How can I place an order for LM22679TJ-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22679TJ-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 LM22679TJ-ADJ/NOPB reliable?
The price and inventory of LM22679TJ-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 LM22679TJ-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22679TJ-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22679TJ-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22679TJ-ADJ/NOPB?
LM22679TJ-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22679TJ-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 LM22679TJ-ADJ/NOPB?
For technical support, including LM22679TJ-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22679TJ-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22679TJ-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22679TJ-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 LM22679TJ-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22679TJ-ADJ/NOPB?
All LM22679TJ-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22679TJ-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 LM22679TJ-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22679TJ-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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