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Texas Instruments LM22677TJE-5.0/NOPB
- Part No.:
- LM22677TJE-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22677TJE-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 5A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:635
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Product details
Overview
LM22677TJE-5.0/NOPB from Texas Instruments is a 42-V, 5-A synchronous step-down DC/DC regulator in TO-263 (NDR) package, featuring fixed 5.0 V output, 500 kHz default switching frequency, ±1.5% feedback reference accuracy, and integrated bootstrap diode. It delivers high efficiency (>90%) in industrial power rails converting 12 V or 24 V inputs to stable 5 V for microcontroller cores and peripheral logic.
For engineers reviewing the LM22677TJE-5.0/NOPB datasheet, LM22677TJE-5.0/NOPB pinout, LM22677TJE-5.0/NOPB application, or LM22677TJE-5.0/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), thermal performance (RθJA = 22°C/W), current limit (6.0–8.4 A), soft-start timing (500 µs), and synchronization capability up to 1 MHz.
Technical Context
The LM22677TJE-5.0/NOPB implements voltage-mode PWM control with input voltage feedforward for stable loop gain across wide VIN ranges. Its internal Type III compensation is optimized for fixed 5 V output, eliminating external compensation components.
It integrates a 100-mΩ N-channel MOSFET switch, precision enable input with 1.6 V threshold and 0.6 V hysteresis, and RT/SYNC pin supporting three modes: internal 500 kHz oscillator, resistor-adjustable 200–1000 kHz, or external clock synchronization - though frequency adjustment and sync cannot operate simultaneously.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to 24 V industrial buses and automotive battery systems without pre-regulation. |
| Output Voltage | Fixed 5.0 V ±1.5% - eliminates external feedback resistors; ensures stable logic supply for MCU I/O and analog peripherals. |
| Max Output Current | 5 A continuous - sustains full load under worst-case thermal conditions with 1 sq-in PCB copper. |
| Switching Frequency | 500 kHz default, adjustable 200–1000 kHz - enables compact 2.2 µH inductors and low-ESR ceramic output capacitors. |
| Quiescent Current | 3.4 mA typical at VFB = 5 V - minimizes no-load power loss in always-on subsystems. |
| Standby Current | 25 µA typical - allows deep sleep mode in battery-backed applications without significant drain. |
| Thermal Shutdown | 150°C junction - protects against sustained overload or inadequate heatsinking in enclosed enclosures. |
Pinout & Package
LM22677TJE-5.0/NOPB uses the NDR (TO-263-7) thermally enhanced package with exposed pad soldered to GND plane for optimal heat dissipation (RθJA = 22°C/W with 1 sq-in 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 EMI and ringing. |
| VIN (Pin 2) | Main input supply | Accepts 4.5–42 V; must be decoupled with ≥10 µF low-ESR capacitor near pin. |
| BOOT (Pin 3) | Bootstrap supply | Connects to SW via 10 nF ceramic capacitor; enables high-side gate drive; requires short, wide traces. |
| GND (Pin 4) | Power ground | Common return for VIN, FB, EN, and exposed pad; must tie directly to thermal pad and system ground plane. |
| 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 tied to 5 V reference; unused in -5.0 variant - leave open or connect to VOUT per datasheet guidance. |
| EN (Pin 7) | Enable control | Active-high; 1.6 V threshold with 0.6 V hysteresis; supports precise power sequencing and external UVLO. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bootstrap diode | Eliminates external Schottky diode, reducing BOM count and board area while maintaining efficient high-side drive. |
| Internal loop compensation | Enables stable operation with standard 2.2 µH inductors and 22 µF ceramic output capacitors-no tuning required. |
| Precision enable with UVLO | Allows controlled startup sequencing and prevents operation below 4.3 V input, protecting downstream circuitry from brownout. |
| Soft-start (500 µs) | Prevents inrush current into bulk capacitance during power-up, avoiding input rail sag and stress on input capacitors. |
| Thermal shutdown + current limit | Provides dual protection: cycle-by-cycle current limiting (6–8.4 A) and latch-off thermal shutdown at 150°C junction. |
Applications
| Industrial PLC Power Supply | Telecom Line Card Bias |
|---|---|
Use Scenario: Converting 24 V backplane rail to regulated 5 V for FPGA configuration, Ethernet PHYs, and management controllers. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, sequenced 5 V with fast transient response to handle bursty data traffic loads. Use Value: 5 A capability supports multi-rail loads; 500 kHz switching enables small magnetics; thermal robustness ensures reliability in fanless chassis. | Use Scenario: Providing isolated 5 V bias for optical transceiver modules in 1RU line cards operating from –48 V DC input (via intermediate 12 V). IC Role / Device Role / Timing Role: Secondary-stage point-of-load regulator ensuring tight 5 V tolerance (<±2%) for sensitive laser driver ICs. Use Value: ±1.5% reference accuracy and low output ripple (<20 mVpp) maintain signal integrity; SYNC pin allows noise spreading across multiple regulators. |
| Automotive Body Control Module | Embedded System Main Rail |
Use Scenario: Generating 5 V from vehicle battery (9–16 V nominal, up to 42 V load dump) for microcontroller, CAN transceivers, and sensor interfaces. IC Role / Device Role / Timing Role: High-reliability main power converter meeting AEC-Q100 Grade 1 requirements (–40°C to +125°C). Use Value: Wide VIN range handles cold-crank and load-dump events; integrated protection avoids need for external TVS or current-sense circuits. | Use Scenario: Powering ARM Cortex-M7-based edge gateway with real-time OS, Wi-Fi/BLE coexistence, and USB host peripherals. IC Role / Device Role / Timing Role: Central 5 V power rail supplying CPU core logic, memory interface, and I/O buffers with low-noise, high PSRR performance. Use Value: Internal compensation simplifies layout; soft-start prevents reset glitches during boot; exposed pad ensures thermal margin under sustained 4 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 |
|---|---|---|---|
| LM22670TJE-5.0/NOPB | Lower 3 A output current; identical pinout, package, and feature set except reduced current limit (4.5–6.5 A). | Suitable only for <3 A loads; same thermal footprint but lower power handling. | Select when full 5 A capability is unnecessary and cost reduction is prioritized over headroom. |
| TPS54560QDGQRQ1 | 42 V, 5 A regulator with adjustable frequency (100–2500 kHz), higher quiescent current (110 µA in eco-mode), no integrated bootstrap diode. | Requires external bootstrap diode; offers wider frequency range but more complex layout and component count. | Choose when >1 MHz operation or tighter EMI control is needed, accepting added design complexity. |
Compared with LM22677TJE-5.0/NOPB, LM22670TJE-5.0/NOPB trades current capacity for cost, while TPS54560QDGQRQ1 adds frequency flexibility at the expense of integration and layout simplicity - making LM22677TJE-5.0/NOPB optimal for robust, production-ready 5 A designs requiring minimal external components.
Availability
LM22677TJE-5.0/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom line cards, and automotive body electronics requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LM22677TJE-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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability DC/DC conversion.
The LM22677 product line delivers SIMPLE SWITCHER® step-down regulators designed for rugged industrial, automotive, and telecom applications where wide input range, integrated protection, and ease of design-in are critical.
FAQ
What is the maximum input voltage rating for LM22677TJE-5.0/NOPB?
The absolute maximum input voltage for LM22677TJE-5.0/NOPB is 43 V, with recommended continuous operation between 4.5 V and 42 V. This allows safe use in 24 V industrial systems and automotive environments subject to load dump transients up to 42 V. Exceeding 43 V risks permanent damage to the internal MOSFET and control circuitry.
Does LM22677TJE-5.0/NOPB require external feedback resistors?
No, LM22677TJE-5.0/NOPB has a factory-trimmed internal feedback network for fixed 5.0 V output. Pin 6 (FB) is internally connected to the 5 V reference and should remain unconnected or tied to VOUT per TI's layout guidance - no external resistors are needed, reducing component count and layout sensitivity.
Can LM22677TJE-5.0/NOPB synchronize to an external clock?
Yes, LM22677TJE-5.0/NOPB supports external synchronization via the RT/SYNC pin. When driven with a clean 0–5 V square wave at 50% duty cycle and frequency between 500 kHz and 1 MHz, it locks to the rising edge. The external clock must exceed the internal 500 kHz oscillator and meet VSYNC threshold (1.75 V) and FSYNC (1 MHz) specifications in the datasheet.
What thermal performance can be expected from LM22677TJE-5.0/NOPB in a standard PCB layout?
With 1 square inch of 2-oz copper connected to the exposed pad, LM22677TJE-5.0/NOPB achieves RθJA = 22°C/W. At 5 A load and 12 V input, typical power dissipation is ~1.2 W, resulting in ~26°C junction-to-ambient rise - well within the –40°C to +125°C operating range. Doubling copper area reduces thermal resistance by ~20%.
Is LM22677TJE-5.0/NOPB qualified for automotive applications?
LM22677TJE-5.0/NOPB is not the automotive-grade variant; the LM22677-Q1 is AEC-Q100 Grade 1 qualified (–40°C to +125°C). While LM22677TJE-5.0/NOPB shares identical electrical specs and package, it lacks automotive-specific qualification testing and documentation - use LM22677-Q1 for safety-critical or production automotive systems.
LM22677TJE-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
LM22677TJE-5.0/NOPB FAQ
1.How can I place an order for LM22677TJE-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22677TJE-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 LM22677TJE-5.0/NOPB reliable?
The price and inventory of LM22677TJE-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 LM22677TJE-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM22677TJE-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22677TJE-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22677TJE-5.0/NOPB?
LM22677TJE-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22677TJE-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 LM22677TJE-5.0/NOPB?
For technical support, including LM22677TJE-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22677TJE-5.0/NOPB requirements.
6.How does Aetrix verify that LM22677TJE-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22677TJE-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 LM22677TJE-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM22677TJE-5.0/NOPB?
All LM22677TJE-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22677TJE-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 LM22677TJE-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM22677TJE-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM22677TJE-5.0/NOPB Tags
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