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Texas Instruments LM22676QTJ-ADJ/NOPB
- Part No.:
- LM22676QTJ-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22676QTJ-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:2,948
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Product details
Overview
LM22676QTJ-ADJ/NOPB from Texas Instruments is a 42 V, 3 A adjustable-output synchronous step-down DC/DC regulator in an 8-pin SO PowerPAD package. It integrates a 120 mΩ N-channel MOSFET switch, operates at 500 kHz fixed frequency, delivers ±1.5% feedback reference accuracy (1.285 V), and supports input voltages from 4.5 V to 42 V - ideal for industrial power conversion from 12 V or 24 V rails.
For engineers reviewing the LM22676QTJ-ADJ/NOPB datasheet, LM22676QTJ-ADJ/NOPB pinout, LM22676QTJ-ADJ/NOPB application, or LM22676QTJ-ADJ/NOPB equivalent, key selection criteria include its internally compensated voltage-mode control, integrated bootstrap diode, precision enable with 1.6 V threshold and 0.6 V hysteresis, 25 µA shutdown current, and thermal shutdown at 150°C.
Technical Context
The LM22676QTJ-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain across wide VIN ranges. Its internal Type III compensation is optimized for output voltages ≤5 V, enabling stable operation with low-ESR ceramic capacitors without external compensation components.
It uses a floating high-side gate driver powered by an external bootstrap capacitor (10 nF) between BOOT and SW pins. Minimum on-time (100 ns) and off-time (200 ns) constraints govern duty-cycle limits, while current limiting (3.4–5.3 A) and thermal shutdown (150°C trip, 135°C recovery) provide fault protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct regulation from unregulated 12 V, 24 V, or 36 V industrial rails. |
| Output Current | Up to 3 A continuous - sufficient for powering FPGAs, microcontrollers, and analog subsystems. |
| Switching Frequency | 500 kHz (±20%) - enables compact magnetics and good transient response without EMI concerns. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; used with external resistor divider for precise VOUT. |
| MOSFET RDS(on) | 120 mΩ (typ) - reduces conduction loss and improves efficiency (>90% typical at mid-load). |
| Quiescent Current | 3.4 mA (typ) - ensures low no-load power draw in always-on systems. |
| Shutdown Current | 25 µA (typ) - enables ultra-low-power system-level sequencing and standby modes. |
| Enable Threshold | 1.6 V (typ), 0.6 V hysteresis - allows clean, noise-immune power-up/down control via resistor dividers. |
Pinout & Package
LM22676QTJ-ADJ/NOPB is housed in an 8-pin SO PowerPAD (DDA) package with exposed thermal pad soldered to PCB ground for enhanced thermal performance (RθJA = 60°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch node | Drives external inductor; swings from GND to VIN; connects to cathode of Schottky catch diode. |
| 2 VIN | Main input supply | Accepts 4.5–42 V; requires local 10 µF ceramic bypass capacitor near pin. |
| 3 BOOT | Bootstrap supply | Connects to SW via 10 nF ceramic capacitor; powers high-side gate driver. |
| 4 GND | Power and signal ground | System common return; must be tied to exposed pad for thermal and electrical integrity. |
| 5 EN | Enable control | Logic-compatible input; <1.6 V disables regulator (25 µA IQ); >2.2 V enables. |
| 6 FB | Feedback input | High-impedance (230 nA bias) node sensing output voltage via resistive divider. |
| 7 NC | No connect | Not electrically bonded; serves as thermal conductor only - must be left floating or grounded. |
| 8 NC | No connect | Not electrically bonded; serves as thermal conductor only - must be left floating or grounded. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network - simplifies design and improves robustness across load/line variations. |
| Integrated bootstrap diode | Reduces BOM count and layout complexity by eliminating discrete bootstrap diode in high-side driver path. |
| Stable with low-ESR ceramic capacitors | Enables use of compact, high-reliability MLCCs instead of bulkier electrolytics - improves long-term stability and temperature performance. |
| 500 µs internal soft-start | Prevents inrush current and output overshoot during power-up - avoids stress on downstream circuitry and input source. |
| Precision enable with UVLO | Allows controlled sequencing and external undervoltage lockout (VIN < 3.9 V disables operation) - protects against brownout conditions. |
| Thermal shutdown + current limit | Provides autonomous fault recovery: shuts down at 150°C junction, restarts at ~135°C; limits peak switch current to prevent damage. |
Applications
| Industrial Motor Control | Telecom Power Supply |
|---|---|
|
Use Scenario: Regulating 24 V bus to 3.3 V/5 V for PLC I/O modules and encoder interfaces. IC Role / Device Role / Timing Role: Primary buck converter delivering stable, low-noise power to digital logic and analog signal conditioning circuits. Use Value: Wide 4.5–42 V input range accommodates fluctuating factory power; 3 A output sustains burst loads from solenoid drivers and communication transceivers. |
Use Scenario: Converting -48 V telecom rectified rail to +5 V for line-card processors and PHYs. IC Role / Device Role / Timing Role: Secondary-side non-isolated buck regulator providing point-of-load (POL) voltage after front-end isolation. Use Value: High efficiency (>90%) minimizes heat in dense line cards; 500 kHz switching enables small 2.2 µH inductors and 10–22 µF ceramic output caps. |
| Automotive Body Control Module | Embedded System Power |
|
Use Scenario: Deriving 3.3 V from 12 V battery rail for microcontroller, CAN transceiver, and sensor interface in BCM. IC Role / Device Role / Timing Role: Main system regulator with automotive-grade thermal and electrical robustness (–40°C to +125°C TJ). Use Value: Precision enable and UVLO prevent operation during cold-crank (≤3.9 V); integrated protection avoids need for external supervision ICs. |
Use Scenario: Powering ARM Cortex-M7 SoC and DDR memory in edge AI gateway with tight thermal envelope. IC Role / Device Role / Timing Role: High-current POL regulator with fast transient response for dynamic CPU load changes. Use Value: Internal compensation and 100 ns minimum on-time support wide VIN/VOUT ratios (e.g., 12 V → 1.1 V); SO PowerPAD enhances thermal dissipation under sustained 2.5 A load. |
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 architecture but PSOP-8 package (NDR thermal metric: 22°C/W); 100 mΩ RDS(on); identical electrical specs. | Better thermal performance in high-power density layouts due to lower RθJA; requires different footprint and reflow profile. | Select when board space permits larger PSOP-8 and thermal management is critical above 2.5 A continuous. |
| LM2596T-ADJ/NOPB | Lower 40 V max input; 3 A rating; 150 kHz switching; external compensation required; no integrated bootstrap diode. | Suitable for cost-sensitive, lower-frequency designs where EMI filtering is easier; lacks precision enable and soft-start. | Choose only if 500 kHz switching is unnecessary and layout area allows external compensation components. |
Compared with LM22676QTJ-ADJ/NOPB, the LM22670TJ-ADJ/NOPB offers superior thermal resistance but requires PCB redesign, while the LM2596T-ADJ/NOPB sacrifices integration and performance for cost - making LM22676QTJ-ADJ/NOPB optimal for space-constrained, thermally demanding 42 V industrial applications.
Availability
LM22676QTJ-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial motor control, telecom power supply, automotive body control modules, and embedded system power requiring stable component supply, long lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LM22676QTJ-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, serving industrial, automotive, and communications markets.
The LM22676 series belongs to TI's SIMPLE SWITCHER® family - designed for ease-of-use in non-isolated DC/DC buck conversion, emphasizing minimal external components, internal compensation, and WEBENCH®-enabled rapid design-in.
FAQ
What is the minimum output voltage achievable with LM22676QTJ-ADJ/NOPB?
The LM22676QTJ-ADJ/NOPB has a nominal feedback reference voltage of 1.285 V with ±1.5% accuracy over temperature. This sets the practical minimum output voltage when using the ADJ version - no external components can reduce VOUT below this reference. The device cannot regulate below 1.285 V, and attempting to do so results in loss of regulation. Therefore, LM22676QTJ-ADJ/NOPB is not suitable for sub-1.285 V applications such as core voltage scaling for advanced processors.
Does LM22676QTJ-ADJ/NOPB require an external bootstrap diode?
No, LM22676QTJ-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external diode between BOOT and SW pins. This simplifies layout and reduces BOM count. Only a 10 nF ceramic capacitor is required between BOOT and SW to form the bootstrap supply. Using an external diode with LM22676QTJ-ADJ/NOPB is unnecessary and may interfere with proper gate drive operation.
Can LM22676QTJ-ADJ/NOPB operate with ceramic output capacitors only?
Yes, LM22676QTJ-ADJ/NOPB is explicitly characterized and stabilized for use with low-ESR ceramic capacitors - a key design feature confirmed in the datasheet. Unlike older controllers requiring tantalum or aluminum electrolytics for phase margin, LM22676QTJ-ADJ/NOPB's internal Type III compensation ensures stability with typical 10–47 µF X5R/X7R MLCCs. This enables smaller footprint, longer lifetime, and improved temperature stability versus electrolytic solutions.
What is the purpose of the NC pins on LM22676QTJ-ADJ/NOPB?
The two NC pins (pins 7 and 8) on LM22676QTJ-ADJ/NOPB are not electrically connected to internal circuitry. They serve solely as thermal conductors - part of the SO PowerPAD package's thermal enhancement structure. These pins must be either left floating or connected to PCB ground (same net as exposed pad) to improve heat transfer from the die to the board. Connecting them to any other net may compromise thermal performance or cause unintended coupling.
How does the enable function behave during input undervoltage conditions?
LM22676QTJ-ADJ/NOPB features dual-stage input protection: built-in UVLO (rising threshold ~4.3 V, falling ~3.9 V) and a precision enable pin (EN) with 1.6 V threshold and 0.6 V hysteresis. When VIN drops below UVLO thresholds, the regulator disables regardless of EN state. However, EN provides programmable control - pulling EN <1.6 V forces shutdown even if VIN is valid, while leaving EN open or >2.2 V enables operation subject to UVLO. This allows flexible sequencing and custom brownout thresholds beyond the internal UVLO limits.
LM22676QTJ-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:
- 3A
- 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
LM22676QTJ-ADJ/NOPB FAQ
1.How can I place an order for LM22676QTJ-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22676QTJ-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 LM22676QTJ-ADJ/NOPB reliable?
The price and inventory of LM22676QTJ-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 LM22676QTJ-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22676QTJ-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22676QTJ-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22676QTJ-ADJ/NOPB?
LM22676QTJ-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22676QTJ-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 LM22676QTJ-ADJ/NOPB?
For technical support, including LM22676QTJ-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22676QTJ-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22676QTJ-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22676QTJ-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 LM22676QTJ-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22676QTJ-ADJ/NOPB?
All LM22676QTJ-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22676QTJ-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 LM22676QTJ-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22676QTJ-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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