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Texas Instruments LM22677TJ-ADJ/NOPB
- Part No.:
- LM22677TJ-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22677TJ-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,906
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Product details
Overview
LM22677TJ-ADJ/NOPB from Texas Instruments is a 42-V, 5-A synchronous step-down DC/DC regulator with adjustable output (as low as 1.285 V), 500-kHz default switching frequency, and integrated 100-mΩ N-channel MOSFET. It operates across –40°C to +125°C and delivers >90% efficiency in industrial power rails converting 24-V/12-V inputs to sub-5-V logic supplies.
For engineers reviewing the LM22677TJ-ADJ/NOPB datasheet, LM22677TJ-ADJ/NOPB pinout, LM22677TJ-ADJ/NOPB application, or LM22677TJ-ADJ/NOPB equivalent, key selection criteria include its internal voltage-mode compensation, precision enable threshold (1.6 V typ), ±1.5% feedback reference accuracy, and RT/SYNC pin configurability for frequency adjustment or synchronization - all critical for stable, noise-sensitive embedded power designs.
Technical Context
The LM22677TJ-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain against VIN variations, enabling optimized transient response. Its internal Type III compensation is tuned for outputs ≤5 V and eliminates external compensation components.
It integrates a bootstrap gate driver with dedicated BOOT/SW pins, supports soft-start (500 µs fixed ramp), and features thermal shutdown (150°C) plus cycle-by-cycle current limiting (7.1 A typ). The EN pin provides precision UVLO control (1.6 V threshold, 0.6 V hysteresis), and RT/SYNC enables three operating modes: internal 500-kHz clock, resistor-adjusted 200–1000 kHz, or external synchronization up to 1 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide industrial input rails including 24-V and 12-V systems without pre-regulation. |
| Output Current | Up to 5 A continuous - sufficient for FPGA core, microcontroller, or DSP power domains. |
| Feedback Reference | 1.285 V (typ), ±1.5% - enables precise adjustable output down to 1.285 V with external resistor divider. |
| Switching Frequency | 500 kHz (default), adjustable 200–1000 kHz - balances EMI, component size, and efficiency in compact layouts. |
| RDS(ON) | 100 mΩ (typ) - reduces conduction loss and thermal stress at full load. |
| Quiescent Current | 3.4 mA (typ) - minimizes no-load power draw in always-on subsystems. |
| Standby Current | 25 µA (typ) - enables ultra-low-power shutdown for battery-backed or energy-harvesting applications. |
| Junction Temp Range | –40°C to +125°C - qualified for harsh industrial and automotive under-hood environments. |
Pinout & Package
LM22677TJ-ADJ/NOPB uses the NDR (TO-263-7) package: 10.16 mm × 9.85 mm body with exposed thermal pad (EP) soldered to PCB ground for enhanced thermal dissipation (RθJA = 22°C/W with 1 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node output | Drives external inductor; swings from GND to VIN - requires low-inductance layout and ceramic boot capacitor. |
| VIN | Main power input | Supplies internal circuitry and high-side FET; accepts 4.5–42 V with 43-V absolute max rating. |
| BOOT | Bootstrap supply | Connects to SW via 10-nF ceramic capacitor to generate gate drive voltage for internal N-FET. |
| GND | Power and signal ground | Common return for control circuitry and power stage; must be tied to EP for thermal and noise integrity. |
| RT/SYNC | Oscillator mode control | Configures frequency: floating = 500 kHz, resistor-to-GND = 200–1000 kHz, external clock = sync mode (≥500 kHz). |
| FB | Feedback input | Senses output via resistor divider; regulates VOUT to 1.285 V reference - sets output voltage precisely. |
| EN | Enable control | Active-high logic input; 1.6 V threshold enables sequencing and external UVLO with hysteresis (0.6 V). |
| EP | Exposed thermal pad | Must be soldered to GND plane - primary thermal path; improves power handling and reliability at 5 A. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates external compensation network - simplifies design and ensures stability for VOUT ≤5 V. |
| Integrated bootstrap diode | Removes need for external bootstrap diode - reduces BOM count and layout complexity. |
| Adjustable switching frequency & sync capability | Enables EMI mitigation and multi-rail phase alignment without external clock generators. |
| Precision enable with UVLO hysteresis | Supports reliable power sequencing and battery discharge protection using simple resistor dividers. |
| Thermal shutdown and current limiting | Provides autonomous fault protection during overload or poor heatsinking - prevents device damage. |
| Stable with low-ESR ceramic capacitors | Allows use of compact, high-reliability MLCCs instead of bulkier electrolytics - improves long-term stability. |
Applications
| Industrial Motor Drives | Telecom Line Cards |
|---|---|
Use Scenario: Powering gate drivers, isolated ADCs, and MCU peripherals in servo amplifier modules. IC Role / Device Role / Timing Role: Primary 3.3-V/2.5-V point-of-load regulator fed from 24-V bus. Use Value: Delivers 5-A peak current with <1.5% output error and fast transient recovery - maintains timing-critical control loop integrity. | Use Scenario: Generating bias voltages for RF front-end amplifiers and digital signal processors on telecom line cards. IC Role / Device Role / Timing Role: High-efficiency buck converter supplying 1.8-V core and 3.3-V I/O rails. Use Value: 500-kHz switching enables small 2.2-µH inductors and 22-µF ceramic output caps - saves board space in dense line card layouts. |
| Automotive Body Control Modules | Embedded Medical Sensors |
Use Scenario: Regulating power for LIN transceivers, CAN interfaces, and microcontrollers in BCMs. IC Role / Device Role / Timing Role: Automotive-grade DC/DC converter (LM22677-Q1 variant) accepting 12-V battery input with cold-crank tolerance. Use Value: –40°C to +125°C operation and AEC-Q100 Grade 1 qualification ensure robustness during engine bay thermal cycling. | Use Scenario: Supplying ultra-low-noise analog front-ends and low-power microcontrollers in portable diagnostic sensors. IC Role / Device Role / Timing Role: Adjustable-output buck regulator delivering 1.285–3.6 V from single-cell Li-ion or 5-V USB input. Use Value: 25-µA standby current extends battery life; soft-start prevents sensor reset during power-up. |
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 | 3-A rated, same package and pinout, identical control architecture but lower current capability. | 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. |
| TPS54560QDGQRQ1 | 5-A, 60-V input, integrated compensation, but requires external bootstrap diode and has different pinout. | Better suited for higher-input-voltage automotive applications requiring >42-V tolerance. | Choose only if system VIN exceeds 42 V or AEC-Q100 Grade 1 compliance is mandatory. |
Compared with LM22670TJ-ADJ/NOPB, the LM22677TJ-ADJ/NOPB delivers 67% higher output current in identical footprint; versus TPS54560QDGQRQ1, it offers integrated bootstrap diode and simpler layout at the cost of 18-V lower max input voltage - making it optimal for 24-V industrial systems needing minimal external components.
Availability
LM22677TJ-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial motor drives, telecom line cards, and embedded medical sensors requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM22677TJ-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 DC/DC conversion.
The LM22677TJ-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use in industrial and automotive power supplies, emphasizing minimal external components, internal compensation, and WEBENCH®-enabled design integration.
FAQ
What is the minimum output voltage supported by the LM22677TJ-ADJ/NOPB?
The LM22677TJ-ADJ/NOPB supports a minimum output voltage of 1.285 V (typical), set by its internal feedback reference voltage. This value is specified across –40°C to +125°C with ±1.5% accuracy, enabling precise low-voltage regulation for modern microcontrollers and FPGAs. The actual output is determined by the external resistor divider connected to the FB pin, and the device remains stable down to this reference level without requiring additional compensation.
Does the LM22677TJ-ADJ/NOPB require an external bootstrap diode?
No, the LM22677TJ-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component between BOOT and VIN. This simplifies layout, reduces BOM count, and improves reliability. Users must still place a 10-nF ceramic capacitor directly between BOOT and SW pins with short, wide traces to ensure proper gate drive voltage generation for the internal high-side MOSFET.
Can the LM22677TJ-ADJ/NOPB synchronize to an external clock?
Yes, the LM22677TJ-ADJ/NOPB can synchronize to an external clock applied to the RT/SYNC pin. The device detects synchronization mode during startup when the RT/SYNC voltage is held outside the 0.8-V threshold window. Synchronization is valid for external frequencies from 500 kHz up to 1 MHz, with rising-edge triggering. If the external clock is lost, the device automatically reverts to its internal 500-kHz oscillator.
What thermal performance can be expected from the LM22677TJ-ADJ/NOPB in a standard PCB layout?
In a standard layout with 1 in² of 2-oz copper connected to the exposed pad (EP), the LM22677TJ-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-to-ambient rise above ambient - well within the 125°C max junction limit. Performance improves with additional copper area or thermal vias under the EP.
How does the enable pin (EN) function in the LM22677TJ-ADJ/NOPB?
The EN pin of the LM22677TJ-ADJ/NOPB is a precision enable input with a 1.6-V typical turn-on threshold and 0.6-V hysteresis. Pulling EN below 1.3 V disables the regulator, reducing quiescent current to 25 µA (typ). An internal 6-µA pullup allows direct connection to VIN for always-on operation, or a resistor divider for sequenced startup. The pin tolerates up to 6 V absolute maximum and supports external UVLO implementation for battery protection.
LM22677TJ-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
LM22677TJ-ADJ/NOPB FAQ
1.How can I place an order for LM22677TJ-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22677TJ-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 LM22677TJ-ADJ/NOPB reliable?
The price and inventory of LM22677TJ-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 LM22677TJ-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22677TJ-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22677TJ-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22677TJ-ADJ/NOPB?
LM22677TJ-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22677TJ-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 LM22677TJ-ADJ/NOPB?
For technical support, including LM22677TJ-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22677TJ-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22677TJ-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22677TJ-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 LM22677TJ-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22677TJ-ADJ/NOPB?
All LM22677TJ-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22677TJ-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 LM22677TJ-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22677TJ-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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