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Texas Instruments LM22670QTJ-ADJ/NOPB
- Part No.:
- LM22670QTJ-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- TO-263-7 Thin
- Datasheet:
-
LM22670QTJ-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A TO263-7
- Quantity:
- Payment:
- Shipping:
Inventory:1,372
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Product details
Overview
LM22670QTJ-ADJ/NOPB from Texas Instruments is a 42-V, 3-A synchronous step-down DC/DC regulator in HSOP-8 PowerPAD™ package, featuring adjustable output (≥1.285 V), 500-kHz default switching frequency, ±1.5% feedback reference accuracy, and integrated bootstrap diode - used for industrial power conversion from 24-V/12-V rails.
For engineers reviewing the LM22670QTJ-ADJ/NOPB datasheet, LM22670QTJ-ADJ/NOPB pinout, LM22670QTJ-ADJ/NOPB application, or LM22670QTJ-ADJ/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), thermal performance with exposed pad, internal compensation for ≤5-V outputs, and RT/SYNC pin configurability for frequency adjustment or synchronization.
Technical Context
The LM22670QTJ-ADJ/NOPB implements voltage-mode PWM control 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 output voltages ≤5 V and supports ceramic output capacitors with low ESR.
It integrates a 120-mΩ N-channel MOSFET switch, precision enable input (1.6 V threshold, 0.6 V hysteresis), and soft-start (500 µs typical). The BOOT–SW bootstrap circuit requires a 10-nF ceramic capacitor, and minimum off-time ensures reliable gate drive recharge under ≥5-mA load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct regulation from unregulated 24-V industrial or automotive rails without pre-regulation. |
| Output Current | Up to 3 A continuous - sufficient for powering FPGA I/O banks, microcontroller cores, or multi-rail embedded systems. |
| Feedback Reference | 1.285 V (typ), ±1.5% - enables precise adjustable output down to 1.285 V; stable over –40°C to +125°C junction temperature. |
| Switching Frequency | 500 kHz (default), adjustable 200 kHz–1 MHz via RT/SYNC resistor - balances efficiency, EMI, and external component size. |
| RDS(ON) | 120 mΩ (PFM package) - reduces conduction loss at full load; thermally enhanced by exposed pad tied to PCB ground. |
| Quiescent Current | 3.4 mA (active), 25 µA (shutdown) - enables low-power standby in battery-backed or always-on industrial controllers. |
| Thermal Resistance | RθJA = 60°C/W (HSOP-8 with 1-in² copper) - requires minimal heatsinking for 3-A operation at ambient ≤85°C. |
Pinout & Package
LM22670QTJ-ADJ/NOPB uses the HSOP-8 PowerPAD™ package (4.89 mm × 3.90 mm) with an exposed thermal pad electrically and thermally connected to GND. The pad must be soldered to a dedicated PCB ground plane for thermal and electrical integrity.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node | High-current switching output connected to inductor; swings between ~0 V and VIN; requires low-inductance layout. |
| 2 VIN | Input Supply | Main power input (4.5–42 V); decoupling capacitor must be placed adjacent to this pin and GND. |
| 3 BOOT | Bootstrap Supply | Connects to SW via 10-nF ceramic capacitor; supplies gate drive for high-side MOSFET; not internally connected. |
| 4 GND | Power Ground | Analog and power ground reference; ties to exposed pad; must be low-impedance connection to system ground. |
| 5 RT/SYNC | Oscillator Control | Configures frequency mode: floating = 500 kHz, resistor-to-GND = 200 kHz–1 MHz, external clock = sync mode. |
| 6 FB | Feedback Input | Monitors output via resistive divider; sets regulated voltage as VOUT = 1.285 V × (1 + R1/R2). |
| 7 EN | Enable Input | Logic-level ON/OFF control; 1.6 V threshold with 0.6 V hysteresis; internal 6-µA pullup allows floating-high operation. |
| 8 NC | No Connect | Not electrically bonded; no internal connection; must remain unconnected on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Internally Compensated Loop | Eliminates need for external compensation network; optimized for ≤5-V outputs using standard ceramic capacitors. |
| Integrated Bootstrap Diode | Reduces BOM count and layout complexity; eliminates discrete bootstrap diode while maintaining reliable high-side gate drive. |
| Precision Enable with UVLO | Enables controlled power sequencing and prevents startup below 4.3 V input; supports external UVLO using resistor divider. |
| Soft-Start (500 µs) | Prevents inrush current and output overshoot during startup; resets automatically on shutdown or thermal fault. |
| Thermal Shutdown & Current Limit | Protects against sustained overload or ambient overheating; triggers at 150°C junction temp and ~3.4–5.5 A peak switch current. |
Applications
| Industrial Motor Drive I/O Power | Telecom Line Card Bias Supply |
|---|---|
|
Use Scenario: Powers isolated gate drivers, analog front-ends, and digital logic in servo amplifier modules operating from 24-V bus. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3-V or 5-V rail; handles line transients up to 42 V. Use Value: Wide VIN range and 120-mΩ RDS(ON) ensure >90% efficiency at 2-A load; exposed pad sustains continuous 3-A operation. |
Use Scenario: Generates 1.8-V or 2.5-V core supply for FPGAs and DSPs on telecom line cards fed from -48-V or +24-V backplane. IC Role / Device Role / Timing Role: Adjustable-output step-down converter with tight feedback accuracy (±1.5%) for low-voltage logic rails. Use Value: Internal compensation and ceramic-capacitor compatibility simplify layout; 500-kHz switching enables compact 2.2-µH inductor. |
| Automotive Body Control Module | Embedded System Auxiliary Rail |
|
Use Scenario: Supplies 5-V rail for microcontrollers and CAN transceivers in body electronics exposed to load-dump conditions. IC Role / Device Role / Timing Role: High-input-voltage buck regulator with precision enable for controlled wake-up/sleep sequencing. Use Value: 42-V absolute max rating and integrated UVLO prevent damage during 36-V load dump; EN pin hysteresis avoids chatter. |
Use Scenario: Provides configurable 1.285–12-V output for sensor biasing, ADC references, or programmable logic in IoT edge devices. IC Role / Device Role / Timing Role: Adjustable-output DC/DC with RT/SYNC pin supporting frequency tuning to avoid EMI bands. Use Value: 200–1000-kHz adjustability enables EMI compliance; FB pin bias current (230 nA) minimizes divider error at low currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22671QTJ-ADJ/NOPB | Same pinout and features, but rated for 45-V max input and includes improved thermal performance (RθJA = 55°C/W). | Better suited for 36-V automotive systems with higher transient margin; identical FB accuracy and soft-start timing. | Select when operating near 42-V limit or requiring extended thermal headroom in sealed enclosures. |
| TPS54340DDAR | 42-V, 3.5-A regulator with current-mode control, adjustable soft-start, and lower RDS(ON) (95 mΩ), but requires external compensation. | Offers faster transient response and higher current capability, but increases design complexity with compensation network. | Choose when dynamic load regulation is critical and layout space allows for compensation components. |
Compared with LM22670QTJ-ADJ/NOPB, LM22671QTJ-ADJ/NOPB extends input voltage margin and thermal capability without changing footprint or control interface, while TPS54340DDAR trades internal compensation for higher current and current-mode benefits - making LM22670QTJ-ADJ/NOPB optimal for rapid, low-risk designs needing fixed-frequency simplicity and ceramic-capacitor compatibility.
Availability
LM22670QTJ-ADJ/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 automotive-grade reliability (AEC-Q100 Grade 1 qualified variant available).
Supply support for LM22670QTJ-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 power conversion solutions.
The LM22670 series belongs to TI's SIMPLE SWITCHER® family - designed for ease-of-use in industrial, automotive, and telecom applications where minimal external components, internal compensation, and robust thermal performance are essential.
FAQ
What is the minimum output voltage supported by the LM22670QTJ-ADJ/NOPB?
The LM22670QTJ-ADJ/NOPB supports a minimum output voltage of 1.285 V (typical feedback reference voltage), as confirmed in the Electrical Characteristics table. This value is specified over –40°C to +125°C junction temperature and applies directly to the LM22670QTJ-ADJ/NOPB when configured with appropriate FB divider resistors. Output voltages below 1.285 V are not achievable due to internal reference limitation.
Does the LM22670QTJ-ADJ/NOPB require an external bootstrap diode?
No, the LM22670QTJ-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component. As stated in the Features section and Functional Block Diagram, this integration simplifies layout and reduces BOM count. A 10-nF ceramic capacitor must still be placed between BOOT and SW pins to complete the bootstrap supply path for the high-side MOSFET gate driver.
Can the LM22670QTJ-ADJ/NOPB synchronize to an external clock?
Yes, the LM22670QTJ-ADJ/NOPB supports external clock synchronization via the RT/SYNC pin. When an external clock signal (1.75 V threshold, rising-edge triggered, 200 kHz–1 MHz) is applied, the device latches into sync mode at startup. The datasheet specifies maximum synchronization frequency of 1 MHz and requires the external clock to exceed the internal 500-kHz oscillator frequency to enter this mode reliably.
What is the thermal resistance (RθJA) of the LM22670QTJ-ADJ/NOPB in its HSOP-8 package?
The LM22670QTJ-ADJ/NOPB in HSOP-8 PowerPAD™ package has a junction-to-ambient thermal resistance (RθJA) of 60°C/W when mounted on 1 square inch of 2-oz copper. This value assumes proper soldering of the exposed thermal pad to the PCB ground plane. Actual RθJA may range from 42°C/W to 115°C/W depending on PCB copper area and thermal vias - per Thermal Information Table 6.5.
Is the LM22670QTJ-ADJ/NOPB pin-compatible with the LM22670-5.0 variants?
Yes, the LM22670QTJ-ADJ/NOPB is pin-compatible with other LM22670 variants including LM22670-5.0/NOPB, as confirmed by the shared Pin Configuration and Functions table for the HSOP-8 package. Both share identical pin numbering, functions, and package dimensions (4.89 mm × 3.90 mm), allowing direct substitution in designs where feedback configuration differs but layout remains unchanged.
LM22670QTJ-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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-7 Thin
LM22670QTJ-ADJ/NOPB FAQ
1.How can I place an order for LM22670QTJ-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22670QTJ-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 LM22670QTJ-ADJ/NOPB reliable?
The price and inventory of LM22670QTJ-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 LM22670QTJ-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22670QTJ-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22670QTJ-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22670QTJ-ADJ/NOPB?
LM22670QTJ-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22670QTJ-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 LM22670QTJ-ADJ/NOPB?
For technical support, including LM22670QTJ-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22670QTJ-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22670QTJ-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22670QTJ-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 LM22670QTJ-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22670QTJ-ADJ/NOPB?
All LM22670QTJ-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22670QTJ-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 LM22670QTJ-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22670QTJ-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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