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Texas Instruments LM22679QTJ-ADJ/NOPB
- Part No.:
- LM22679QTJ-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22679QTJ-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,863
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Product details
Overview
LM22679QTJ-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 with wide VIN range.
For engineers reviewing the LM22679QTJ-ADJ/NOPB datasheet, LM22679QTJ-ADJ/NOPB pinout, LM22679QTJ-ADJ/NOPB application, or LM22679QTJ-ADJ/NOPB equivalent, key selection considerations include its internally compensated voltage-mode control, adjustable current limit via IADJ pin, soft-start timing programmability, thermal shutdown at 150°C, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The LM22679QTJ-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain across 4.5–42 V input range. Its internal Type III compensation is optimized for output voltages ≤5 V, enabling stable operation without external compensation components.
It integrates a 100-mΩ N-channel MOSFET switch, supports minimum on-time of 100 ns and off-time of 200 ns, and uses an external bootstrap capacitor between BOOT and SW pins to drive the high-side FET - requiring ≥5 mA minimum load for reliable recharge during each cycle.
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 - sufficient for powering FPGA cores, DSPs, and multi-rail subsystems from single-stage conversion. |
| 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%) - balances small external inductor/capacitor size with EMI and transient response requirements. |
| RDS(ON) | 0.10 Ω (typ) - reduces conduction loss and improves full-load efficiency above 90% at mid-load conditions. |
| Junction Temp Range | –40°C to 125°C - qualified for industrial ambient environments and thermally demanding PCB layouts. |
| Current Limit | 7.1 A (typ), adjustable via IADJ pin resistor - allows optimization of overcurrent protection threshold for specific inductor and layout constraints. |
Pinout & Package
LM22679QTJ-ADJ/NOPB is housed in a TO-263-7 (PFM) thermally enhanced package with exposed pad (EP) for direct PCB grounding and improved heat dissipation. Package dimensions are 10.16 mm × 9.85 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch Node Output | Drives external inductor; swings from ~0 V to VIN - requires low-inductance routing to minimize ringing and EMI. |
| VIN | Main Input Supply | Connects to bulk input capacitor; must be decoupled close to device to suppress high-frequency noise. |
| BOOT | Bootstrap Supply | Connects to 10-nF ceramic capacitor between BOOT and SW - critical for high-side gate drive integrity. |
| GND | Power Ground | System return path; connects to EP - forms low-impedance thermal and electrical ground plane. |
| IADJ | Current Limit Adjust | Resistor-to-GND sets peak switch current limit; floating defaults to 7.1 A - enables design-specific overload tailoring. |
| FB | Feedback Input | High-impedance (230 nA bias) node sensing output voltage via resistor divider - sensitive to noise; place divider near FB pin. |
| SS | Soft-Start Control | Capacitor-to-GND extends startup time linearly (TSS ≈ 26 ms/µF); resets on UVLO or thermal shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Internally Compensated Control | Eliminates need for external compensation network - reduces BOM count and design iteration time for buck converters. |
| Integrated Bootstrap Diode | Removes discrete bootstrap diode requirement - simplifies layout and improves reliability in high-duty-cycle applications. |
| Adjustable Soft-Start | External capacitor on SS pin controls inrush current and output voltage ramp rate - prevents input rail sag and downstream supply sequencing issues. |
| UVLO with Hysteresis | Rising threshold 4.3 V, falling threshold 3.9 V - ensures clean startup and shutdown behavior across varying input source conditions. |
| Thermal Shutdown Protection | Activates at ~150°C junction temperature and releases at ~135°C - prevents permanent damage during sustained overload or poor heatsinking. |
Applications
| Industrial Power Supplies | Test & Measurement Equipment |
|---|---|
Use Scenario: Converting 24-V or 48-V factory bus to 3.3-V/5-V rails for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated low-voltage power with high line/load regulation and minimal external components. Use Value: Wide 4.5–42-V input range accommodates brownout and surge conditions common in industrial settings without auxiliary regulators. | Use Scenario: Providing stable, low-noise 1.8-V and 3.3-V supplies for precision ADCs, DACs, and signal chain ICs in benchtop instruments. IC Role / Device Role / Timing Role: High-efficiency, low-ripple DC/DC converter supporting accurate analog measurements under dynamic load transients. Use Value: 500-kHz switching frequency enables compact LC filter design while maintaining fast transient response for pulsed measurement loads. |
| Appliance Control Boards | Distributed Power Architectures |
Use Scenario: Generating 5-V logic supply and 12-V motor driver bias from 12–36-V battery or rectified AC in smart home appliances. IC Role / Device Role / Timing Role: Main system power regulator with adjustable output and robust thermal management for enclosed, fanless enclosures. Use Value: Exposed pad TO-263 package and 125°C max junction temperature support continuous operation in thermally constrained appliance chassis. | Use Scenario: Local point-of-load conversion in modular server racks or telecom line cards where multiple isolated 12-V inputs feed distributed 3.3-V/5-V domains. IC Role / Device Role / Timing Role: Compact, high-current buck regulator enabling flexible board-level power distribution without centralized DC/DC modules. Use Value: Adjustable current limit (via IADJ) allows matching to local load requirements and inductor saturation margins - reducing component stress and improving system-level reliability. |
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-ADJ/NOPB | Same family, 3-A output rating, identical pinout and control architecture. | Suitable for lower-current designs where 5-A capability is unnecessary - reduces thermal design complexity and cost. | Select when load current remains ≤3 A and smaller solution size is prioritized over headroom. |
| LM61460RQAR | Higher efficiency (95%+), lower IQ (26 µA), PFM mode at light load, 3–36-V input, 6-A output. | Better suited for battery-powered or energy-sensitive systems requiring ultra-low standby power and improved EMI performance. | Choose for new designs targeting higher efficiency, lower quiescent current, and advanced EMI mitigation - not pin-compatible. |
Compared with LM22679QTJ-ADJ/NOPB, LM22670TJ-ADJ/NOPB offers reduced current capability in the same footprint for cost-optimized 3-A applications, while LM61460RQAR provides superior efficiency and light-load performance at the expense of different pinout, control scheme, and non-drop-in replacement requirements.
Availability
LM22679QTJ-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, test equipment, appliance control boards, and distributed power architectures requiring stable component supply across extended temperature and input voltage ranges.
Supply support for LM22679QTJ-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 solutions.
The LM22679QTJ-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - designed for ease-of-use in wide-input DC/DC buck applications, minimizing external component count and accelerating time-to-market through WEBENCH® integration and internal compensation.
FAQ
What is the minimum output voltage supported by the LM22679QTJ-ADJ/NOPB?
The LM22679QTJ-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, and the LM22679QTJ-ADJ/NOPB's internal compensation is optimized for outputs at or below 5 V.
Does the LM22679QTJ-ADJ/NOPB require an external bootstrap diode?
No, the LM22679QTJ-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component between BOOT and SW pins. A 10-nF ceramic capacitor must still be placed directly between BOOT and SW with short, wide traces to ensure proper high-side gate drive. This integration simplifies layout and improves reliability compared to controllers requiring discrete bootstrap diodes.
How is current limit adjusted on the LM22679QTJ-ADJ/NOPB?
Current limit on the LM22679QTJ-ADJ/NOPB is adjusted using a resistor connected between the IADJ pin and GND. With IADJ floating, the default current limit is 7.1 A (typ). When a resistor is applied, the internal 0.8-V reference sets the current limit per Figure 7-3 in the datasheet, with accuracy of +35% / –25%. The LM22679QTJ-ADJ/NOPB samples IADJ voltage at startup (~100 µs after VIN application) and holds that setting until next power cycle.
What thermal metrics apply to the LM22679QTJ-ADJ/NOPB in its TO-263 package?
The LM22679QTJ-ADJ/NOPB in TO-263-7 (PFM) 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 dedicated to heat transfer. The device includes thermal shutdown at ~150°C and restarts at ~135°C. The exposed pad (EP) must be soldered to a solid GND plane for optimal thermal performance.
Can the LM22679QTJ-ADJ/NOPB operate with ceramic output capacitors only?
Yes, the LM22679QTJ-ADJ/NOPB is explicitly designed to be stable with low-ESR ceramic output capacitors - a key feature highlighted in its datasheet. Unlike older controllers requiring electrolytic or tantalum capacitors for phase margin, its internal Type III compensation and voltage-mode architecture ensure stability across standard X5R/X7R MLCC values typically used in modern compact designs.
LM22679QTJ-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
LM22679QTJ-ADJ/NOPB FAQ
1.How can I place an order for LM22679QTJ-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22679QTJ-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 LM22679QTJ-ADJ/NOPB reliable?
The price and inventory of LM22679QTJ-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 LM22679QTJ-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22679QTJ-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22679QTJ-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22679QTJ-ADJ/NOPB?
LM22679QTJ-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22679QTJ-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 LM22679QTJ-ADJ/NOPB?
For technical support, including LM22679QTJ-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22679QTJ-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22679QTJ-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22679QTJ-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 LM22679QTJ-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22679QTJ-ADJ/NOPB?
All LM22679QTJ-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22679QTJ-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 LM22679QTJ-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22679QTJ-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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