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Texas Instruments LM22677TJ-5.0/NOPB
- Part No.:
- LM22677TJ-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22677TJ-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 5A TO263-7
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM22677TJ-5.0/NOPB from Texas Instruments is a 42-V input, 5-A synchronous step-down DC/DC regulator with fixed 5.0 V output, integrated 100-mΩ N-channel MOSFET switch, and internal voltage-mode compensation. It delivers >90% efficiency at full load, supports 4.5–42 V input range, and operates across –40°C to +125°C junction temperature for industrial power rails.
For engineers reviewing the LM22677TJ-5.0/NOPB datasheet, LM22677TJ-5.0/NOPB pinout, LM22677TJ-5.0/NOPB application, or LM22677TJ-5.0/NOPB equivalent, key selection factors include its fixed 5.0 V ±1.5% feedback accuracy, 500 kHz default switching frequency, precision enable threshold (1.6 V typ), integrated bootstrap diode, and TO-263-7 (NDR) thermal pad package.
Technical Context
The LM22677TJ-5.0/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain against VIN variation, enabling optimized transient response. Its internal Type III compensation is tuned for fixed 5-V output configurations, eliminating external compensation components.
It integrates a high-side N-channel MOSFET with 100-mΩ RDS(ON), bootstrapped gate drive, soft-start (500 µs), thermal shutdown (150°C), and current limiting (7.1 A min). The RT/SYNC pin supports three modes: internal 500 kHz oscillator, resistor-adjustable 200–1000 kHz, or external synchronization up to 1 MHz - but not simultaneously with frequency adjustment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±1.5% over –40°C to +125°C; eliminates need for external feedback divider. |
| Input Voltage Range | 4.5 V to 42 V; supports wide industrial and automotive supply rails including 12 V, 24 V, and 36 V systems. |
| Max Output Current | 5 A continuous; enabled by integrated 100-mΩ N-FET and exposed thermal pad (NDR package). |
| Switching Frequency | 500 kHz default; adjustable 200–1000 kHz or synchronizable to external clock ≤1 MHz for EMI control. |
| Feedback Reference | 1.285 V internal reference; enables precise 5.0 V regulation via internal resistor ratio (no external resistors required). |
| Enable Threshold | 1.6 V typical falling threshold with 0.6 V hysteresis; allows clean power sequencing and external UVLO implementation. |
| Quiescent Current | 3.4 mA typical at VOUT = 5 V; reduces no-load power loss in always-on systems. |
| Standby Current | 25 µA typical in shutdown; critical for battery-backed or low-power standby applications. |
Pinout & Package
LM22677TJ-5.0/NOPB uses the TO-263-7 (NDR) package with an exposed thermal pad that must be soldered to PCB ground for thermal and electrical performance. Dimensions: 10.16 mm × 9.85 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Drives external inductor; swings between GND and VIN; requires low-inductance layout for EMI control. |
| VIN (Pin 2) | Power input | Primary input supply (4.5–42 V); connects to bulk capacitor and must be decoupled near device. |
| BOOT (Pin 3) | Bootstrap supply | Provides gate drive voltage for high-side FET; requires 10 nF ceramic capacitor between BOOT and SW. |
| GND (Pin 4) | Ground reference | Analog and power ground return; tied to exposed pad for thermal conduction and noise reduction. |
| RT/SYNC (Pin 5) | Oscillator control | Selects operating mode: floating = 500 kHz, resistor-to-GND = adjustable freq., external clock = sync mode. |
| FB (Pin 6) | Feedback input | Internally connected to 5.0 V divider; not accessible externally on -5.0 version - no external resistor needed. |
| EN (Pin 7) | Enable control | Logic-level input; <1.6 V disables regulator (25 µA IQ); >2.2 V enables; includes 0.6 V hysteresis. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boot-Strap Diode | Eliminates external bootstrap diode; reduces BOM count and layout complexity while maintaining reliable high-side gate drive. |
| Stable with Ceramic Capacitors | Designed for low-ESR ceramic output capacitors; avoids electrolytic or tantalum requirements and improves reliability. |
| Internal Soft-Start | 500 µs fixed ramp time; prevents inrush current and output overshoot during power-up without external timing components. |
| WEBENCH® Enabled | Fully supported in TI's WEBENCH Power Designer; enables automated component selection, efficiency simulation, and thermal modeling. |
| Precision Enable Input | 1.6 V threshold with 0.6 V hysteresis; enables robust power sequencing and programmable UVLO using simple resistor dividers. |
| Thermal Shutdown Protection | 150°C junction limit with automatic recovery; protects against sustained overload or poor heatsinking without latch-up. |
Applications
| Industrial Control Power | Telecom Line Card Supply |
|---|---|
Use Scenario: Providing regulated 5 V for PLC I/O modules, motor drivers, and sensor interfaces in factory automation cabinets with 24 V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator converting 24 V rail to isolated 5 V logic supply; handles load transients from solenoid actuation. Use Value: Delivers 5 A continuously with >90% efficiency and stable operation across –40°C to +85°C ambient, reducing thermal management burden. | Use Scenario: Generating 5 V for FPGA configuration, Ethernet PHYs, and microcontrollers on telecom line cards powered from –48 V or 24 V intermediate bus. IC Role / Device Role / Timing Role: Point-of-load (POL) regulator with fast transient response; synchronized to system clock via RT/SYNC to suppress conducted EMI. Use Value: Fixed 5.0 V output ensures compatibility with standard logic families; 500 kHz switching enables compact 2.2 µH inductor and 22 µF ceramic capacitor solution. |
| Embedded System Main Rail | Automotive Body Control Module |
Use Scenario: Powering ARM Cortex-M7 MCU, DDR memory, and peripherals in ruggedized edge computing gateways with 12 V vehicle or PoE-derived input. IC Role / Device Role / Timing Role: High-efficiency main system rail; EN pin controlled by MCU GPIO for controlled power-up sequence and sleep-state entry. Use Value: 25 µA shutdown current extends battery backup runtime; internal compensation eliminates tuning effort for 5 V output stability. | Use Scenario: Supplying 5 V to microcontroller, CAN transceivers, and LED drivers in body control units (BCUs) operating from 12 V battery with cold-crank down to 4.5 V. IC Role / Device Role / Timing Role: Automotive-grade buck converter (LM22677-Q1 variant qualified); LM22677TJ-5.0/NOPB used in non-AEC designs requiring same performance. Use Value: Wide 4.5–42 V input range accommodates load-dump transients; precision enable allows integration into vehicle wake-up logic without external supervisors. |
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-5.0/NOPB | 3-A rated version; identical pinout, package, and feature set except lower current limit (4.3 A min) and higher RDS(ON) (130 mΩ). | Suitable only where peak load ≤3 A; smaller inductor/capacitor sizing possible but insufficient for 5 A continuous loads. | Select LM22670TJ-5.0/NOPB only if system max load is ≤3 A and board space or cost optimization is prioritized. |
| TPS54560QDGQRQ1 | Automotive-grade 60 V, 5-A buck; adjustable output (requires external FB resistors); 100 µA IQ in shutdown; no integrated bootstrap diode. | Requires external bootstrap diode and feedback network; wider VIN range suits 48 V systems; AEC-Q100 Grade 1 qualified. | Choose TPS54560QDGQRQ1 when automotive qualification, 60 V input tolerance, or lower shutdown IQ is mandatory - but expect added BOM and layout complexity. |
Compared with LM22670TJ-5.0/NOPB, LM22677TJ-5.0/NOPB delivers 5 A vs 3 A with lower RDS(ON), enabling higher efficiency at full load; versus TPS54560QDGQRQ1, it offers fixed 5 V output and integrated bootstrap diode for simpler, more compact 5 V POL designs - though without AEC-Q100 certification.
Availability
LM22677TJ-5.0/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power, and embedded system applications requiring stable component supply, long-term manufacturability, and thermal robustness in TO-263 packages.
Supply support for LM22677TJ-5.0/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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.
The LM22677 product line belongs to TI's SIMPLE SWITCHER® family - designed for easy, reliable, and efficient DC/DC conversion with minimal external components and full WEBENCH® design tool integration.
FAQ
What is the output voltage tolerance of LM22677TJ-5.0/NOPB over temperature and line?
The LM22677TJ-5.0/NOPB provides a fixed 5.0 V output with ±1.5% accuracy over the full operating junction temperature range (–40°C to +125°C) and input voltage range (4.5 V to 42 V), as specified in the Electrical Characteristics table. This tolerance includes initial accuracy, temperature drift, and line regulation - verified by TI's production testing and statistical quality control methods.
Does LM22677TJ-5.0/NOPB require external compensation components?
No, LM22677TJ-5.0/NOPB features fully internal Type III voltage-mode compensation optimized for fixed 5 V output. No external compensation network is needed - unlike adjustable versions such as LM22677-ADJ, which rely on the same internal compensation but assume ≤5 V outputs. This simplifies design and improves reliability.
Can LM22677TJ-5.0/NOPB synchronize to an external clock?
Yes, LM22677TJ-5.0/NOPB supports external synchronization via the RT/SYNC pin. When driven with a clean square wave (≥1.75 V threshold, ≤1 MHz), it locks to the rising edge of the external clock. Synchronization is latched at startup and reverts to 500 kHz internal operation if the external clock is lost during operation.
What thermal performance can be expected from LM22677TJ-5.0/NOPB in TO-263 package?
LM22677TJ-5.0/NOPB in the NDR (TO-263-7) package has a junction-to-ambient thermal resistance (RθJA) of 22°C/W when mounted on 1 in² of 2-oz copper. Actual thermal performance depends on PCB copper area and airflow; TI recommends connecting the exposed pad directly to a solid GND plane for optimal heat dissipation and electrical noise reduction.
Is LM22677TJ-5.0/NOPB pin-compatible with LM22677-ADJ variants?
Yes, LM22677TJ-5.0/NOPB is fully pin-compatible with all LM22677 variants including LM22677-ADJ, sharing identical TO-263-7 (NDR) package, pinout, and footprint. However, the FB pin is internally connected to the 5 V divider in LM22677TJ-5.0/NOPB and must not be externally loaded - unlike the -ADJ version where FB is user-accessible for output adjustment.
LM22677TJ-5.0/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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- 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-5.0/NOPB FAQ
1.How can I place an order for LM22677TJ-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22677TJ-5.0/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-5.0/NOPB reliable?
The price and inventory of LM22677TJ-5.0/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-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM22677TJ-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22677TJ-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22677TJ-5.0/NOPB?
LM22677TJ-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22677TJ-5.0/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-5.0/NOPB?
For technical support, including LM22677TJ-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22677TJ-5.0/NOPB requirements.
6.How does Aetrix verify that LM22677TJ-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22677TJ-5.0/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-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM22677TJ-5.0/NOPB?
All LM22677TJ-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22677TJ-5.0/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-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM22677TJ-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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