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Texas Instruments LM22670TJ-ADJ/NOPB
- Part No.:
- LM22670TJ-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22670TJ-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO263-7
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM22670TJ-ADJ/NOPB from Texas Instruments is a 42-V, 3-A synchronous step-down DC/DC regulator in HSOP-8 PowerPAD™ package, featuring voltage-mode PWM control, internal loop compensation, and adjustable output down to 1.285 V. It delivers >90% efficiency at full load with 500-kHz default switching frequency and supports industrial power rails (24 V, 12 V) and embedded systems requiring stable, high-input-voltage conversion.
For engineers reviewing the LM22670TJ-ADJ/NOPB datasheet, LM22670TJ-ADJ/NOPB pinout, LM22670TJ-ADJ/NOPB application, or LM22670TJ-ADJ/NOPB equivalent, key selection criteria include its 4.5–42 V input range, ±1.5% feedback reference accuracy, integrated bootstrap diode, thermal shutdown protection, and compatibility with low-ESR ceramic output capacitors - all critical for rugged industrial and telecom power designs.
Technical Context
The LM22670TJ-ADJ/NOPB implements a voltage-mode PWM architecture with input voltage feedforward to stabilize loop gain across wide VIN variations, enabling optimized transient response without external compensation. Its internal Type III compensator is tuned for outputs ≤5 V, and the 120-mΩ N-channel MOSFET switch supports continuous 3-A output current with fixed 500-kHz operation or resistor-adjustable 200 kHz–1 MHz range.
Functional modes include precision enable-controlled startup (1.6 V threshold, 0.6 V hysteresis), 500-µs integrated soft-start, and self-synchronization capability via RT/SYNC pin. Thermal shutdown activates at 150°C, and current limiting folds back to ~100 kHz under severe overload to prevent inductor saturation and runaway.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to unregulated 24-V/12-V industrial rails without pre-regulation. |
| Output Current | Up to 3 A continuous - enables single-chip solution for mid-power subsystems like FPGA I/O or DSP core supplies. |
| Feedback Reference | 1.285 V (typ), ±1.5% - sets minimum adjustable output; enables precise regulation of 1.8 V, 2.5 V, 3.3 V, or custom voltages via external resistor divider. |
| Switching Frequency | 500 kHz (default), adjustable 200 kHz–1 MHz - balances EMI mitigation, component size, and efficiency across diverse board layouts. |
| MOSFET RDS(ON) | 120 mΩ (PFM package, 25°C) - reduces conduction loss and thermal stress at full load, supporting >90% peak efficiency. |
| Quiescent Current | 3.4 mA (active), 25 µA (shutdown) - minimizes standby power in always-on systems while enabling fast wake-up. |
| Junction Temp Range | –40°C to +125°C - qualified for extended industrial environments without derating in standard PCB copper layout. |
Pinout & Package
LM22670TJ-ADJ/NOPB uses the HSOP-8 PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to GND plane for enhanced heat dissipation. The 8-pin configuration includes dedicated BOOT, SW, FB, EN, RT/SYNC, VIN, and GND terminals - no NC pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch node output | Drives external inductor; swings between ~0 V and VIN; requires low-inductance layout to minimize ringing and EMI. |
| 2 - VIN | Main input supply | Accepts 4.5–42 V; must be decoupled near pin with ≥10 µF ceramic capacitor to handle high di/dt during switching. |
| 3 - BOOT | Bootstrap supply input | Connects to SW via 10-nF ceramic capacitor; provides gate drive voltage for internal high-side MOSFET. |
| 4 - GND | Power ground reference | System common return; tied directly to exposed pad for thermal and electrical integrity. |
| 5 - RT/SYNC | Oscillator control | Selects mode: floating = 500 kHz, resistor-to-GND = 200 kHz–1 MHz, external clock = synchronization up to 1 MHz. |
| 6 - FB | Feedback input | Senses output voltage via resistor divider; internal 1.285-V reference enables accurate adjustable regulation. |
| 7 - EN | Enable control | Logic-level input (1.6 V threshold); enables precise power sequencing and external UVLO implementation. |
| 8 - EP (Exposed Pad) | Thermal & ground connection | Must be soldered to ≥1 in² PCB copper area connected to GND; critical for thermal performance (RθJA = 60°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network - reduces BOM count and design iteration time for 1.285–5 V outputs. |
| Integrated bootstrap diode | Removes external diode requirement in boot circuit - simplifies layout and improves reliability over discrete solutions. |
| Stable with low-ESR ceramic capacitors | Enables use of compact, high-reliability X7R/X5R MLCCs instead of bulkier electrolytics - saves board space and extends lifetime. |
| Precision enable with UVLO support | Allows controlled power-up sequencing and system-level undervoltage protection using simple resistor dividers - no extra IC needed. |
| 500-µs integrated soft-start | Prevents inrush current and output overshoot during startup - protects downstream components and eliminates need for external timing RC. |
Applications
| Industrial Control Power | Telecom Line Card Supply |
|---|---|
|
Use Scenario: Providing regulated 3.3 V or 5 V to PLC I/O modules operating from 24-V factory bus with wide temperature swings. IC Role / Device Role / Timing Role: Primary buck converter delivering clean, stable output with tight line/load regulation and thermal robustness. Use Value: Maintains ±1.5% output accuracy across –40°C to +125°C junction temp and handles 42-V transients per IEC 61000-4-5. |
Use Scenario: Generating 1.8 V core voltage for FPGAs on telecom line cards powered from –48 V DC via intermediate 12-V rail. IC Role / Device Role / Timing Role: Secondary-step-down regulator with adjustable output and synchronization capability to avoid beat frequencies with system clocks. Use Value: Enables RT/SYNC pin locking to master clock - reduces conducted EMI in dense backplane environments. |
| Embedded System Main Rail | Automotive Body Control Module |
|
Use Scenario: Converting 12-V vehicle battery or 24-V truck supply to 5 V for microcontroller, CAN transceiver, and sensor interface circuits. IC Role / Device Role / Timing Role: High-efficiency primary DC/DC stage with integrated soft-start and precision enable for controlled system boot. Use Value: Delivers >90% efficiency at 2-A load and draws only 25 µA in shutdown - extends battery life during sleep modes. |
Use Scenario: Powering infotainment sub-systems in body control units where input voltage may dip to 4.5 V during cold-crank. IC Role / Device Role / Timing Role: Input-robust buck regulator with built-in UVLO (4.3 V turn-on) and thermal shutdown (150°C). Use Value: Continues regulation down to 4.5 V input and survives 42-V load-dump transients - meets automotive reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22671TJ-ADJ/NOPB | Same pinout and features, but rated for 45 V max input and 2.5 A output; lower RDS(ON) (100 mΩ) in SO PowerPAD-8 package. | Better suited for higher-current, lower-loss designs where 42-V headroom is insufficient or thermal margin is constrained. | Select when output current exceeds 2.5 A or input voltage may exceed 42 V in transient conditions. |
| LM2596T-ADJ/NOPB | Lower 40-V max input, 3-A rating, but fixed 150-kHz switching frequency and no synchronization capability; larger TO-220 package. | Targeted at cost-sensitive, non-EMI-critical applications where small size and high-frequency operation are not required. | Choose for legacy designs needing drop-in replacement with minimal layout change, but expect larger magnetics and reduced transient response. |
Compared with LM22670TJ-ADJ/NOPB, LM22671TJ-ADJ/NOPB offers higher input voltage tolerance and lower conduction loss, while LM2596T-ADJ/NOPB trades frequency flexibility and package size for lower unit cost and simpler design - making each suitable for distinct trade-off priorities in industrial power architecture.
Availability
LM22670TJ-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom infrastructure, and embedded system power designs requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-aligned reliability.
Supply support for LM22670TJ-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 power conversion ICs.
The LM22670TJ-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use in industrial, telecom, and automotive power applications through integrated features, WEBENCH® design support, and minimal external component count.
FAQ
What is the minimum output voltage supported by the LM22670TJ-ADJ/NOPB?
The LM22670TJ-ADJ/NOPB supports a minimum output voltage of 1.285 V (typical), set by its internal feedback reference voltage. This value is specified with ±1.5% accuracy over –40°C to +125°C junction temperature, enabling stable regulation of common logic rails including 1.8 V, 2.5 V, and 3.3 V using an external resistor divider on the FB pin.
Does the LM22670TJ-ADJ/NOPB require external compensation components?
No, the LM22670TJ-ADJ/NOPB features fully internal Type III loop compensation optimized for output voltages up to 5 V. This eliminates the need for external compensation networks, reducing design complexity and bill-of-materials count. Stability verification is still recommended using TI's WEBENCH® Designer tool or measured Bode plots for specific inductor/capacitor selections.
Can the LM22670TJ-ADJ/NOPB synchronize to an external clock signal?
Yes, the LM22670TJ-ADJ/NOPB can synchronize to an external clock applied to the RT/SYNC pin. The device detects synchronization mode during startup when the pin voltage falls outside the 0.8 V threshold. Valid sync frequencies range from >500 kHz up to 1 MHz, with rising-edge triggering and amplitude compliance to the VSYNC specification (1.75 V threshold, 3.5 V logic level).
What thermal performance can be expected from the LM22670TJ-ADJ/NOPB in HSOP-8 PowerPAD™ package?
In the HSOP-8 PowerPAD™ package, the LM22670TJ-ADJ/NOPB achieves a junction-to-ambient thermal resistance (RθJA) of 60°C/W when mounted on 1 in² of 2-oz copper connected to the exposed pad. With adequate PCB copper area and proper soldering of the EP pad to GND, the device sustains 3-A continuous output at +125°C ambient without thermal shutdown under typical industrial airflow conditions.
How does the enable function work on the LM22670TJ-ADJ/NOPB?
The LM22670TJ-ADJ/NOPB features a precision enable input (EN) with a 1.6 V typical turn-on threshold and 0.6 V hysteresis. Pulling EN below 1.6 V disables the regulator, reducing quiescent current to 25 µA (typ). An internal 6-µA pullup allows EN to be tied directly to VIN via a 470-kΩ resistor for automatic startup - or used with a resistor divider for programmable UVLO behavior independent of input rail.
LM22670TJ-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:
- 3A
- 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
LM22670TJ-ADJ/NOPB FAQ
1.How can I place an order for LM22670TJ-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22670TJ-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 LM22670TJ-ADJ/NOPB reliable?
The price and inventory of LM22670TJ-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 LM22670TJ-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22670TJ-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22670TJ-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22670TJ-ADJ/NOPB?
LM22670TJ-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22670TJ-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 LM22670TJ-ADJ/NOPB?
For technical support, including LM22670TJ-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22670TJ-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22670TJ-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22670TJ-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 LM22670TJ-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22670TJ-ADJ/NOPB?
All LM22670TJ-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22670TJ-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 LM22670TJ-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22670TJ-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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