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Texas Instruments LM22679TJE-ADJ/NOPB
- Part No.:
- LM22679TJE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22679TJE-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:667
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Product details
Overview
LM22679TJE-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 adjustable output voltage down to 1.285 V, 500-kHz fixed switching frequency, ±1.5% feedback reference accuracy, and integrated bootstrap diode for simplified layout. It delivers >90% efficiency in industrial power conversion applications requiring wide VIN and robust thermal performance.
For engineers reviewing the LM22679TJE-ADJ/NOPB datasheet, LM22679TJE-ADJ/NOPB pinout, LM22679TJE-ADJ/NOPB application, or LM22679TJE-ADJ/NOPB equivalent, key selection criteria include its 4.5–42 V input range, adjustable current limit via IADJ pin, internal voltage-mode compensation, soft-start programmability, and thermal shutdown at 150°C - all validated for continuous operation from –40°C to 125°C junction temperature.
Technical Context
The LM22679TJE-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain across input variations, enabling optimized transient response without external compensation. Its internal Type III compensation is tuned for outputs ≤5 V, supporting stable regulation with low-ESR ceramic output capacitors.
It integrates a 100-mΩ N-channel MOSFET switch, bootstrap gate driver with dedicated BOOT/SW pins, and programmable protection features: adjustable peak current limit (via resistor on IADJ), soft-start timing (via capacitor on SS), UVLO (4.3 V rising threshold), and thermal shutdown (150°C trip, 135°C hysteresis).
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 - enables single-chip solutions for mid-power distributed loads like FPGA core rails or motor control logic supplies. |
| Feedback Reference | 1.285 V (typ), ±1.5% - sets minimum adjustable output; enables precise low-voltage regulation with external resistor divider. |
| Switching Frequency | 500 kHz (±20%) - allows compact magnetics and input/output capacitors while maintaining fast load transient response. |
| RDS(ON) | 0.10 Ω (typ) - reduces conduction loss and improves full-load efficiency (>90% typical at 12 VIN/3.3 VOUT/5 A). |
| Thermal Shutdown | 150°C (trip), 135°C (release) - provides fail-safe protection during sustained overload or poor PCB heat sinking. |
| Min On/Off Time | 100 ns / 200 ns - enables high step-down ratios (e.g., 42 V → 3.3 V) and ensures reliable bootstrap capacitor recharge. |
Pinout & Package
LM22679TJE-ADJ/NOPB uses the TO-263-7 (PFM) thermally enhanced package (10.16 mm × 9.85 mm body, exposed pad), where the exposed pad must be soldered to a PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch Node Output | Drives external inductor; swings between GND and VIN; requires low-inductance routing to minimize EMI and ringing. |
| VIN | Main Input Supply | Connects to bulk input capacitor; powers internal bias circuitry and high-side gate driver via bootstrap path. |
| BOOT | Bootstrap Capacitor Terminal | Connects to 10-nF ceramic capacitor between BOOT and SW; supplies gate drive voltage for integrated N-FET. |
| GND | Power Ground Reference | Common return for input/output paths; ties to exposed pad; must be low-impedance connection to minimize noise coupling. |
| IADJ | Current Limit Adjustment Input | Resistor-to-GND sets peak switch current (default 7.1 A); floating = factory default; accuracy ±35%/–25% when adjusted. |
| FB | Feedback Input | High-impedance (230 nA bias) node sensing output voltage via resistor divider; placement near output capacitor critical for stability. |
| SS | Soft-Start Control | Capacitor-to-GND extends startup time (≈26 ms/µF); prevents inrush current; resets on UVLO or thermal shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Internally Compensated Voltage Mode Control | Eliminates need for external compensation network; simplifies design and reduces BOM count for buck converters targeting ≤5 V outputs. |
| Adjustable Soft-Start | Single external capacitor (100 nF–1 µF) controls ramp rate; avoids input supply sag and output overshoot during power-up. |
| Programmable Current Limit | Resistor on IADJ pin scales peak switch current from default 7.1 A down to ~3 A; enables smaller inductors and diodes in lower-current designs. |
| Integrated Bootstrap Diode | Removes need for external bootstrap diode; reduces component count and layout area while maintaining reliable high-side FET gate drive. |
| WEBENCH® Enabled | Full online design support including component selection, efficiency simulation, thermal modeling, and Build-It board generation directly from TI's design tool. |
Applications
| Industrial Distributed Power | Test & Measurement Equipment |
|---|---|
Use Scenario: Powering isolated analog front-ends and digital controllers in programmable logic controllers (PLCs) with 24-V DC bus input. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V to 3.3 V/5 V for microcontroller, ADC, and communication ICs. Use Value: Delivers stable 5-A output with <1.5% reference accuracy and thermal shutdown, ensuring uptime in unventilated enclosures. | Use Scenario: Generating clean, low-noise supply rails for precision DACs and high-speed oscilloscope acquisition circuits. IC Role / Device Role / Timing Role: High-efficiency buck converter supplying 1.8 V and 3.3 V rails from variable lab supply (5–40 V). Use Value: 500-kHz switching and internal compensation enable fast transient response and minimal output ripple without complex tuning. |
| Appliance Control Boards | General-Purpose Wide VIN Systems |
Use Scenario: Replacing linear regulators on smart appliance mainboards (refrigerators, washing machines) with 12–42 V battery or rectified AC input. IC Role / Device Role / Timing Role: Main system power IC delivering 5 V for MCU and sensors, with adjustable current limit to match motor driver standby requirements. Use Value: Adjustable IADJ pin allows current limiting to 3 A during idle mode, reducing standby losses and improving energy certification scores. | Use Scenario: Universal input power stage in field-deployable IoT gateways accepting 12–48 V PoE-derived or solar-charged inputs. IC Role / Device Role / Timing Role: Robust primary DC/DC stage providing 5 V/3.3 V for SoC, RF module, and memory subsystems. Use Value: –40°C to 125°C operating range and 42-V max input ensure reliability across outdoor temperature extremes and input surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22678TJE-ADJ/NOPB | 3-A rated version; identical pinout, package, and feature set except lower current capability and reduced RDS(ON) (0.15 Ω). | Suitable for ≤3 A loads; lower thermal stress but cannot replace LM22679TJE-ADJ/NOPB in 5-A designs without derating. | Select when full 5-A output is unnecessary and cost/thermal margin optimization is prioritized. |
| LM61460RQAR | 6-A, 3–36 V input, synchronous converter with lower quiescent current (15 µA), improved EMI performance, and PFM mode at light load. | Not pin-compatible; requires new layout; superior for battery-powered or noise-sensitive applications but lacks 42-V rating. | Choose for next-gen designs needing higher efficiency, lower IQ, or stricter EMI compliance - not as drop-in replacement. |
Compared with LM22679TJE-ADJ/NOPB, LM22678TJE-ADJ/NOPB offers identical integration and ease-of-use at reduced current capacity, while LM61460RQAR provides higher performance and newer architecture but demands redesign effort and sacrifices maximum input voltage headroom.
Availability
LM22679TJE-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, long-term lifecycle support, and verified thermal performance up to 125°C junction temperature.
Supply support for LM22679TJE-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.
The LM22679 series belongs to TI's SIMPLE SWITCHER® family - designed specifically for engineers seeking easy-to-implement, high-voltage buck regulators with minimal external components and full WEBENCH® design tool integration.
FAQ
What is the minimum output voltage supported by the LM22679TJE-ADJ/NOPB?
The LM22679TJE-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) as 1.259 V to 1.311 V. The output is adjusted using an external resistor divider connected to the FB pin, with recommended total divider resistance ≤10 kΩ for optimal accuracy and noise immunity.
Does the LM22679TJE-ADJ/NOPB require an external bootstrap diode?
No, the LM22679TJE-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component. This simplifies layout and reduces bill-of-materials count. A 10-nF ceramic capacitor must still be placed between the BOOT and SW pins, with short, wide PCB traces, to ensure proper high-side gate drive voltage generation and reliable switching operation.
How is current limit configured on the LM22679TJE-ADJ/NOPB?
Current limit on the LM22679TJE-ADJ/NOPB is configured using a resistor connected between the IADJ pin and GND. With no resistor (IADJ floating), the device defaults to 7.1 A (typ). Adding a resistor sets the peak switch current per Figure 7-3 in the datasheet; accuracy is ±35%/–25%. The IADJ pin voltage is held at 0.8 V internally during adjustment, and configuration occurs once at startup.
What package type and thermal characteristics does the LM22679TJE-ADJ/NOPB use?
The LM22679TJE-ADJ/NOPB uses the TO-263-7 (PFM) package with a 10.16 mm × 9.85 mm body and exposed thermal pad. Its junction-to-ambient thermal resistance (RθJA) is 22°C/W when mounted on 1 in² of copper. The exposed pad must be soldered to a PCB ground plane to achieve rated performance and enable thermal shutdown functionality at 150°C.
Is the LM22679TJE-ADJ/NOPB qualified for automotive applications?
No, the LM22679TJE-ADJ/NOPB is not AEC-Q100 qualified. It is the commercial-grade variant. For automotive use, TI offers the LM22679-Q1, which is AEC-Q100 Grade 1 qualified (–40°C to 125°C), manufactured on an automotive-grade flow, and tested to stringent reliability standards. The two share identical pinout and electrical specs but differ in qualification status and screening.
LM22679TJE-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
LM22679TJE-ADJ/NOPB FAQ
1.How can I place an order for LM22679TJE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22679TJE-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 LM22679TJE-ADJ/NOPB reliable?
The price and inventory of LM22679TJE-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 LM22679TJE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22679TJE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22679TJE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22679TJE-ADJ/NOPB?
LM22679TJE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22679TJE-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 LM22679TJE-ADJ/NOPB?
For technical support, including LM22679TJE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22679TJE-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22679TJE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22679TJE-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 LM22679TJE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22679TJE-ADJ/NOPB?
All LM22679TJE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22679TJE-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 LM22679TJE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22679TJE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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