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Texas Instruments LM22677QTJ-ADJ/NOPB
- Part No.:
- LM22677QTJ-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22677QTJ-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A TO263-7
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM22677QTJ-ADJ/NOPB from Texas Instruments is a 42-V, 5-A synchronous step-down DC/DC regulator with adjustable output (down to 1.285 V), 500-kHz fixed switching frequency, and integrated 100-mΩ N-channel MOSFET. It operates from 4.5 V to 42 V input, delivers ±1.5% feedback reference accuracy, and supports industrial embedded power rails requiring high efficiency (>90%) and thermal robustness up to +125°C junction temperature.
For engineers reviewing the LM22677QTJ-ADJ/NOPB datasheet, LM22677QTJ-ADJ/NOPB pinout, LM22677QTJ-ADJ/NOPB application, or LM22677QTJ-ADJ/NOPB equivalent, key selection considerations include its internal voltage-mode control with feedforward, RT/SYNC programmable frequency (200–1000 kHz), precision enable threshold (1.6 V typ), integrated bootstrap diode, and TO-263-7 (NDR) thermally enhanced package with exposed pad.
Technical Context
The LM22677QTJ-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 network is calibrated for stable operation with ceramic output capacitors and inductors targeting outputs ≤5 V.
It integrates a high-side N-channel MOSFET switch (RDS(ON) = 0.1 Ω typ), boot-strapped gate driver, soft-start circuit (500 µs ramp), and precision enable with 0.6 V hysteresis. The RT/SYNC pin determines oscillator mode-floating (500 kHz), resistor-biased (200–1000 kHz), or externally synchronized (up to 1 MHz)-with mode latched at startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide industrial and automotive supply rails including 12 V, 24 V, and 42 V battery systems. |
| Output Current | Up to 5 A - enables single-regulator solutions for mid-power digital loads like FPGAs, microcontrollers, and DSPs. |
| Feedback Reference | 1.285 V (typ), ±1.5% - sets minimum adjustable output; enables precise low-voltage rail generation (e.g., 1.8 V, 3.3 V) using external resistor divider. |
| Switching Frequency | 500 kHz (default), adjustable 200–1000 kHz - balances EMI, component size, and efficiency; synchronization avoids beat frequencies in multi-rail systems. |
| MOSFET RDS(ON) | 0.1 Ω (typ) - reduces conduction loss and thermal stress; supports >90% peak efficiency at moderate loads. |
| Junction Temp Range | –40°C to +125°C - qualified for harsh environments including industrial control cabinets and telecom base stations. |
| Quiescent Current | 3.4 mA (typ), 6 mA (max) - minimizes no-load power draw in always-on subsystems. |
Pinout & Package
LM22677QTJ-ADJ/NOPB uses the TO-263-7 (NDR) thermally enhanced package with 10.16 mm × 9.85 mm body and exposed pad (EP) soldered to PCB ground for optimal thermal dissipation (RθJA = 22°C/W with 1 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Drives external inductor; swings from ~0 V to VIN; requires low-inductance layout to minimize ringing and EMI. |
| VIN (Pin 2) | Main power input | Supplies internal bias and high-side switch; must be decoupled near package with low-ESR capacitor. |
| BOOT (Pin 3) | Bootstrap supply | Connects to SW via 10 nF ceramic capacitor; powers high-side gate driver; requires short, wide traces. |
| GND (Pin 4) | Power ground | System return path for switch current and IC ground; tied to EP for thermal and noise integrity. |
| RT/SYNC (Pin 5) | Oscillator control | Selects operating mode: floating (500 kHz), resistor-to-GND (200–1000 kHz), or external clock sync (≤1 MHz). |
| FB (Pin 6) | Feedback input | Senses output voltage via resistor divider; high-impedance (230 nA bias) enables precision regulation. |
| EN (Pin 7) | Enable control | Logic-level on/off with 1.6 V threshold and 0.6 V hysteresis; supports power sequencing and external UVLO. |
| EP (Exposed Pad) | Thermal & ground connection | Must be soldered to large GND copper area; primary thermal path to PCB; improves power handling and reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation components; ensures stability with ceramic output caps and standard inductors for outputs ≤5 V. |
| Integrated bootstrap diode | Removes external diode requirement; simplifies layout and reduces BOM count while maintaining efficient high-side drive. |
| Precision enable with UVLO support | Enables reliable power sequencing and system-level undervoltage protection using resistor dividers or external references. |
| Adjustable soft-start (500 µs) | Prevents inrush current and output overshoot during startup; resets automatically on shutdown or thermal fault. |
| Thermal shutdown & current limiting | Protects against sustained overloads and PCB overheating; includes foldback mode under severe short-circuit conditions. |
Applications
| Industrial Control Power | Telecom Datacom Supply |
|---|---|
Use Scenario: Powering PLC I/O modules and sensor interface circuits in factory automation cabinets with 24-V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator generating stable 3.3-V or 5-V rails for microcontrollers, ADCs, and isolated communication interfaces. Use Value: Wide 4.5–42-V input range accommodates brownout and surge conditions; ±1.5% reference ensures accurate analog sensing and logic-level compatibility. | Use Scenario: Generating intermediate 12-V or 5-V rails in 48-V telecom rectifier systems for baseband processing units. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter delivering up to 5 A with minimal thermal derating in confined chassis space. Use Value: TO-263-7 exposed pad and 22°C/W thermal resistance enable operation at full load up to +125°C ambient without forced air. |
| Embedded System Core Rail | Automotive Body Control Module |
Use Scenario: Providing core voltage for ARM Cortex-M7 or RISC-V SoCs in edge AI gateways with 12-V vehicle or PoE input. IC Role / Device Role / Timing Role: Adjustable-output buck regulator configured for 1.2-V or 1.8-V core supply with tight transient response. Use Value: 500-kHz switching and internal compensation deliver fast load-step recovery (<10 µs) without external tuning. | Use Scenario: Powering infotainment MCU, CAN transceivers, and LED drivers in 12-V automotive body control units. IC Role / Device Role / Timing Role: Robust DC/DC converter meeting AEC-Q100 Grade 1 requirements (–40°C to +125°C) with built-in UVLO and thermal protection. Use Value: Precision enable allows controlled startup after battery voltage stabilizes; integrated current limit prevents fuse blow during motor actuator faults. |
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 rated for 40-V max input and 3-A output; lower RDS(ON) (0.13 Ω) and reduced thermal capability. | Suitable for lower-power 12-V/24-V systems where 5-A headroom is unnecessary; smaller thermal footprint. | Select when cost or board space is prioritized over 5-A capability and 42-V surge tolerance. |
| LM5164QPWPRQ1 | 42-V, 1-A buck regulator with integrated high-side FET and valley-current mode control; supports wider duty cycle (up to 99%). | Better suited for ultra-low-IQ (15 µA) always-on applications and higher VIN:VOUT ratios (e.g., 42 V → 3.3 V). | Choose for automotive-grade designs needing lower quiescent current and extended light-load efficiency, not higher output current. |
Compared with LM22677QTJ-ADJ/NOPB, LM22670TJ-ADJ/NOPB trades output current and input voltage margin for compactness, while LM5164QPWPRQ1 offers superior light-load efficiency and automotive qualification at the expense of peak current delivery-making LM22677QTJ-ADJ/NOPB optimal for mid-power, thermally demanding industrial buck applications.
Availability
LM22677QTJ-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom datacom, and embedded system power conversion requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LM22677QTJ-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 DC/DC regulator innovation.
The LM22677 product line delivers SIMPLE SWITCHER® ease-of-use for high-voltage buck conversion-designed specifically for industrial, telecom, and automotive applications demanding ruggedness, efficiency, and minimal external components.
FAQ
What is the minimum output voltage supported by the LM22677QTJ-ADJ/NOPB?
The LM22677QTJ-ADJ/NOPB supports a minimum output voltage equal to its internal feedback reference voltage of 1.285 V (typical), with ±1.5% accuracy over temperature. This enables precise generation of common low-voltage rails such as 1.8 V, 2.5 V, and 3.3 V using an external resistor divider on the FB pin. The device's internal compensation is optimized for outputs at or below 5 V, making it ideal for core and I/O supplies in modern embedded systems.
Does the LM22677QTJ-ADJ/NOPB require external compensation components?
No, the LM22677QTJ-ADJ/NOPB features fully internal Type III voltage-mode compensation optimized for outputs ≤5 V. This eliminates the need for external capacitors or resistors in the feedback loop, reducing design complexity and BOM count. Stability is ensured across standard ceramic output capacitors and inductors-verified via TI's WEBENCH® simulation tool. For outputs above 5 V, TI recommends using the LM22677QTJ-5.0/NOPB variant with an external divider instead of modifying the -ADJ version.
How does the RT/SYNC pin function on the LM22677QTJ-ADJ/NOPB?
The RT/SYNC pin on the LM22677QTJ-ADJ/NOPB selects one of three oscillator modes at startup: floating (500 kHz default), resistor-to-GND (200–1000 kHz adjustment), or external clock synchronization (≤1 MHz). Mode detection occurs within ~100 µs of EN assertion or VIN application and is latched until power cycle. Synchronization requires the external clock to exceed 500 kHz and meet VSYNC thresholds (1.75 V typ); if lost, the device reverts to 500 kHz operation. Frequency adjustment and sync cannot operate simultaneously.
What thermal performance can be expected from the LM22677QTJ-ADJ/NOPB in a typical PCB layout?
In a standard layout with 1 in² of 2-oz copper connected to the exposed pad (EP), the LM22677QTJ-ADJ/NOPB achieves a junction-to-ambient thermal resistance (RθJA) of 22°C/W. At 5-A load and 12-V input, typical power dissipation is ~1.5 W, resulting in ~33°C junction rise above ambient-well within the +125°C maximum rating. Performance improves with additional copper area or thermal vias under the EP. Layout guidelines emphasize short, wide traces for BOOT-SW and VIN-GND paths to minimize switching losses and EMI.
Is the LM22677QTJ-ADJ/NOPB qualified for automotive applications?
The LM22677QTJ-ADJ/NOPB itself is not AEC-Q100 qualified; however, the pin-compatible LM22677Q1QTJ-ADJ/NOPB is the automotive-grade variant rated for –40°C to +125°C junction temperature and qualified to AEC-Q100 Grade 1. Both share identical electrical specifications, pinout, and package (TO-263-7 NDR), but only the Q1 suffix denotes automotive qualification. For non-automotive industrial or telecom use, LM22677QTJ-ADJ/NOPB provides identical performance with commercial-grade screening and documentation.
LM22677QTJ-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
LM22677QTJ-ADJ/NOPB FAQ
1.How can I place an order for LM22677QTJ-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22677QTJ-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 LM22677QTJ-ADJ/NOPB reliable?
The price and inventory of LM22677QTJ-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 LM22677QTJ-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22677QTJ-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22677QTJ-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22677QTJ-ADJ/NOPB?
LM22677QTJ-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22677QTJ-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 LM22677QTJ-ADJ/NOPB?
For technical support, including LM22677QTJ-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22677QTJ-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22677QTJ-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22677QTJ-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 LM22677QTJ-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22677QTJ-ADJ/NOPB?
All LM22677QTJ-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22677QTJ-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 LM22677QTJ-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22677QTJ-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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