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Texas Instruments LM22677TJE-ADJ/NOPB
- Part No.:
- LM22677TJE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22677TJE-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:740
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Product details
Overview
LM22677TJE-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 from 4.5 V to 42 V input, delivers ±1.5% feedback reference accuracy, and supports thermal shutdown, current limiting, and precision enable control - used in industrial power rails requiring stable 3.3-V or 5-V conversion from 24-V or 42-V sources.
For engineers reviewing the LM22677TJE-ADJ/NOPB datasheet, LM22677TJE-ADJ/NOPB pinout, LM22677TJE-ADJ/NOPB application, or LM22677TJE-ADJ/NOPB equivalent, key selection criteria include its wide VIN range, internal compensation for ceramic output capacitors, RT/SYNC programmable frequency (200–1000 kHz), integrated bootstrap diode, and –40°C to +125°C junction temperature rating.
Technical Context
The LM22677TJE-ADJ/NOPB implements voltage-mode PWM control with input voltage feedforward to stabilize loop gain across input variations, enabling optimized transient response without external compensation. Its internal Type III compensator is tuned for outputs ≤5 V and supports stable operation with low-ESR ceramic capacitors.
It integrates a high-side N-channel MOSFET switch (RDS(ON) = 0.1 Ω typ), bootstrap gate driver with dedicated BOOT pin, and precision enable input with 1.6-V threshold and 0.6-V hysteresis. The RT/SYNC pin selects among three modes: internal 500-kHz oscillator, resistor-adjusted frequency (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 direct connection to 24-V industrial buses and 36-V automotive systems without pre-regulation. |
| Output Current | Up to 5 A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, or multi-rail embedded systems. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; enables precise 3.3-V, 2.5-V, or 1.8-V generation via external resistor divider. |
| Switching Frequency | 500 kHz default, adjustable 200–1000 kHz - balances EMI, efficiency, and component size; allows synchronization to avoid beat frequencies. |
| MOSFET RDS(ON) | 0.1 Ω typical at TJ = 25°C - reduces conduction loss and thermal stress under full load at high ambient temperatures. |
| Quiescent Current | 3.4 mA typical - ensures low no-load power draw in always-on subsystems like CAN transceivers or real-time clocks. |
| Enable Threshold | 1.6 V with 0.6 V hysteresis - enables clean power sequencing using simple resistor dividers from upstream supplies. |
Pinout & Package
LM22677TJE-ADJ/NOPB uses the NDR (TO-263-7) package: 10.16 mm × 9.85 mm body with exposed thermal pad soldered to PCB ground plane for enhanced heat dissipation (RθJA = 22°C/W with 1-in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node | Drives external inductor; swings from GND to VIN; requires low-inductance layout to minimize ringing and EMI. |
| VIN | Main input supply | Accepts 4.5–42 V; must be decoupled near pin with ≥10 µF low-ESR capacitor to suppress input ripple and transients. |
| BOOT | Bootstrap supply | Connects to SW via 10-nF ceramic capacitor; provides gate drive voltage for high-side MOSFET during on-time. |
| GND | Power ground | System return path; ties to exposed pad; must be low-impedance plane to support 5-A switching currents. |
| RT/SYNC | Oscillator control | Selects operating mode: floating = 500 kHz; resistor-to-GND = 200–1000 kHz; external clock = sync mode up to 1 MHz. |
| FB | Feedback input | Monitors output via resistor divider; internal 1.285-V reference sets regulation point; bias current = 230 nA. |
| EN | Enable input | Logic-level control: <1.6 V disables regulator (25 µA standby); >2.2 V enables; internal 6-µA pullup simplifies interface. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network - reduces BOM count and design risk for 3.3-V/5-V buck converters. |
| Stable with low-ESR ceramic capacitors | Enables use of compact, high-reliability X7R/X5R MLCCs instead of bulkier electrolytics - improves long-term stability and temperature performance. |
| Integrated bootstrap diode | Removes need for external bootstrap diode - simplifies layout, reduces component count, and avoids reverse recovery losses. |
| Adjustable soft-start (500 µs) | Prevents inrush current during power-up - protects input source and downstream circuitry without requiring external timing components. |
| Thermal shutdown & current limit | Protects against sustained overload or poor heatsinking - latches off until VIN cycle; prevents MOSFET destruction during short-circuit events. |
Applications
| Industrial Control | Telecom Power |
|---|---|
Use Scenario: Powering PLC I/O modules and fieldbus interfaces from unregulated 24-V DC rails. IC Role / Device Role / Timing Role: Primary buck converter generating isolated 3.3-V logic supply and 5-V analog rail. Use Value: Wide 4.5–42-V input range accommodates brownout and surge conditions common in factory environments. | Use Scenario: Point-of-load regulation for Ethernet switches and optical line cards fed from 48-V backplane. IC Role / Device Role / Timing Role: Secondary-stage regulator delivering 1.2-V core voltage to ASICs and 3.3-V for PHYs. Use Value: 5-A capability and 500-kHz switching enable compact magnetics while maintaining >90% efficiency at full load. |
| Embedded Systems | Automotive Body Control |
Use Scenario: Power management in ruggedized edge computing gateways with dual 5-V/3.3-V outputs. IC Role / Device Role / Timing Role: Main system regulator supplying processor, memory, and peripherals from 12-V battery-derived input. Use Value: Precision enable input enables coordinated startup with MCU reset and communication interfaces. | Use Scenario: Powering infotainment head units and ADAS camera modules from 12-V vehicle battery. IC Role / Device Role / Timing Role: Non-automotive-grade variant used in non-safety-critical sub-systems requiring extended temp operation. Use Value: –40°C to +125°C junction rating supports under-hood placement without derating at full 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 |
|---|---|---|---|
| LM22670TJE-ADJ/NOPB | 3-A output rating, same package and pinout, identical control architecture but lower current limit. | Suitable for lower-power loads (<3 A); smaller inductor and output cap requirements reduce board area. | Select when full 5-A capability is unnecessary - lowers cost and thermal footprint without redesign. |
| LM2596T-ADJ/NOPB | Fixed 150-kHz frequency, 3-A rating, no RT/SYNC or synchronization capability, higher RDS(ON) (0.15 Ω). | Limited to less demanding applications where EMI filtering is simpler and efficiency at light load is secondary. | Choose for cost-sensitive designs where frequency flexibility and high-current performance are not required. |
Compared with LM22677TJE-ADJ/NOPB, the LM22670TJE-ADJ/NOPB offers identical feature set at reduced current capacity, while the LM2596T-ADJ/NOPB trades programmability and performance for legacy compatibility and lower unit cost - both require verification of thermal margin and loop stability under target load conditions.
Availability
LM22677TJE-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power, and embedded systems requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for LM22677TJE-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 ICs, with decades of expertise in high-reliability DC/DC conversion.
The LM22677 series belongs to TI's SIMPLE SWITCHER® family - designed for ease-of-use in industrial and embedded power applications, emphasizing minimal external components, internal compensation, and robust protection features.
FAQ
What is the minimum output voltage supported by the LM22677TJE-ADJ/NOPB?
The LM22677TJE-ADJ/NOPB supports a minimum output voltage of 1.285 V, set by its internal feedback reference voltage. This value is specified with ±1.5% accuracy over –40°C to +125°C junction temperature. To achieve this minimum, the FB pin must be connected directly to the output; any resistive divider increases the regulated voltage proportionally. The LM22677TJE-ADJ/NOPB datasheet confirms this reference is trimmed and tested across temperature and process variation.
Does the LM22677TJE-ADJ/NOPB require an external bootstrap diode?
No, the LM22677TJE-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component. This simplifies layout and improves reliability by removing reverse recovery concerns. The BOOT pin must still be connected to the SW node via a 10-nF ceramic capacitor, as specified in the LM22677TJE-ADJ/NOPB functional description and layout guidelines. External diodes are neither recommended nor required.
Can the LM22677TJE-ADJ/NOPB synchronize to an external clock?
Yes, the LM22677TJE-ADJ/NOPB supports external synchronization via the RT/SYNC pin. When driven with a clean square wave between 1.75 V and 3.5 V at frequencies up to 1 MHz, it locks to the rising edge of the external signal. Synchronization is enabled automatically during startup if the RT/SYNC pin voltage is held outside the 0.8-V decision threshold. The LM22677TJE-ADJ/NOPB datasheet specifies VSYNC = 1.75 V and FSYNC ≤ 1 MHz as absolute limits.
What is the thermal resistance (RθJA) of the LM22677TJE-ADJ/NOPB in its TO-263 package?
The LM22677TJE-ADJ/NOPB in the NDR (TO-263-7) package has a junction-to-ambient thermal resistance (RθJA) of 22°C/W when mounted on 1 square inch of 2-oz copper. This value assumes optimal PCB layout per TI's AN-1797. Actual RθJA may range from 20°C/W to 30°C/W depending on copper area and airflow. The LM22677TJE-ADJ/NOPB thermal information section explicitly cites this 22°C/W figure under Recommended Operating Conditions.
How does the enable function behave during input undervoltage conditions?
The LM22677TJE-ADJ/NOPB includes an internal undervoltage lockout (UVLO) that disables regulation when VIN falls below ~3.9 V (falling threshold). However, the EN pin remains active: pulling EN low forces shutdown regardless of VIN, while leaving EN floating or tying it above 2.2 V allows automatic UVLO behavior. The LM22677TJE-ADJ/NOPB datasheet states the EN pin has a 6-µA internal pullup and 1.6-V enable threshold with 0.6-V hysteresis - enabling precise external UVLO implementation using a resistor divider.
LM22677TJE-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
LM22677TJE-ADJ/NOPB FAQ
1.How can I place an order for LM22677TJE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22677TJE-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 LM22677TJE-ADJ/NOPB reliable?
The price and inventory of LM22677TJE-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 LM22677TJE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22677TJE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22677TJE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22677TJE-ADJ/NOPB?
LM22677TJE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22677TJE-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 LM22677TJE-ADJ/NOPB?
For technical support, including LM22677TJE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22677TJE-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22677TJE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22677TJE-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 LM22677TJE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22677TJE-ADJ/NOPB?
All LM22677TJE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22677TJE-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 LM22677TJE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22677TJE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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