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Texas Instruments LM22675MR-ADJ/NOPB
- Part No.:
- LM22675MR-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22675MR-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:3,815
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Product details
Overview
LM22675MR-ADJ/NOPB from Texas Instruments is a 42 V, 1 A adjustable-output synchronous step-down DC/DC regulator in an HSOP-8 PowerPAD package. It integrates a 200 mΩ N-channel MOSFET switch, operates at 500 kHz fixed frequency, delivers ±1.5% feedback reference accuracy (1.285 V), and supports input voltages from 4.5 V to 42 V - ideal for industrial power rails converting 24 V or 12 V to 3.3 V or 5 V.
For engineers reviewing the LM22675MR-ADJ/NOPB datasheet, LM22675MR-ADJ/NOPB pinout, LM22675MR-ADJ/NOPB application, or LM22675MR-ADJ/NOPB equivalent, key selection criteria include its internally compensated voltage-mode control, integrated bootstrap diode, precision enable threshold (1.6 V typ), soft-start timing (500 µs), and thermal shutdown at 150°C - all critical for reliable embedded and telecom power design.
Technical Context
The LM22675MR-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain across wide VIN ranges. Its internal Type III compensation network is optimized for output voltages ≤5 V, enabling stable operation with low-ESR ceramic capacitors without external compensation components.
It features a dedicated BOOT pin driving the high-side MOSFET gate via an external 10 nF capacitor, a precision EN pin with 0.6 V hysteresis and 6 µA internal pullup, and current-limit protection (1.3–1.7 A) that transitions to low-frequency foldback under severe overload - ensuring robustness in 24 V industrial systems with variable load profiles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct regulation from unregulated 24 V/12 V industrial rails without pre-regulation. |
| Output Current | Up to 1 A continuous - sufficient for powering microcontrollers, FPGAs, and interface ICs in embedded systems. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; enables precise 3.3 V, 5 V, or custom outputs using external resistor divider. |
| Switching Frequency | 500 kHz (400–600 kHz range) - allows compact 22 µH inductors and low-profile ceramic output capacitors. |
| MOSFET RDS(ON) | 200 mΩ (typ) - minimizes conduction loss and improves efficiency (>90% typical at 12 VIN/3.3 VOUT/1 A). |
| Quiescent Current | 3.4 mA (typ) - enables low-power standby modes; drops to 25 µA in shutdown. |
| Operating Temperature | –40°C to +125°C junction - qualified for industrial and extended-temperature environments. |
Pinout & Package
LM22675MR-ADJ/NOPB uses the HSOP-8 PowerPAD (DDA) package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground for enhanced thermal dissipation (RθJA = 60°C/W with 1 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply input | Connects to SW node via 10 nF ceramic capacitor to generate gate drive voltage for internal high-side MOSFET. |
| EN | Enable control input | Logic-compatible input with 1.6 V turn-on threshold and 0.6 V hysteresis; supports power sequencing and external UVLO. |
| SW | Switch node output | Drives external inductor; swings from GND to VIN; requires Schottky catch diode or synchronous rectifier. |
| FB | Feedback sensing input | High-impedance (230 nA bias) input monitoring output voltage divider; determines regulated output level. |
| GND | Power and signal ground | Primary return path for power stage and control circuitry; must be connected to exposed thermal pad. |
| VIN | Main input supply | Accepts 4.5–42 V DC; powers internal LDO, gate driver, and control logic; requires local 10 µF ceramic bypass. |
| NC (Pins 2,3) | No-connect terminals | Not electrically bonded; serve as thermal conductors only - must not be routed or connected. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control | Eliminates need for external compensation network - reduces BOM count and layout sensitivity for 1 A buck designs. |
| Integrated bootstrap diode | Reduces external component count by embedding charge-pump diode - simplifies BOOT capacitor routing and improves reliability. |
| Fixed 500 kHz switching | Enables predictable EMI filtering and consistent transient response - avoids frequency jitter seen in current-mode controllers. |
| Thermal shutdown & current limit | Protects against sustained overloads and PCB overheating - shuts down at 150°C junction and limits peak switch current to 1.3–1.7 A. |
| Soft-start (500 µs) | Prevents inrush current and output overshoot during power-up - eliminates need for external soft-start capacitor or circuitry. |
Applications
| Industrial Control Power | Telecom Datacom Supply |
|---|---|
Use Scenario: Regulating 24 V field bus to 3.3 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering clean, regulated 3.3 V at up to 1 A with tight line/load regulation. Use Value: Enables direct use of standard 24 V industrial rail without intermediate pre-regulators - reducing system cost and footprint. | Use Scenario: Generating 5 V from 12 V backplane in Ethernet switches and optical line cards. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator supporting hot-swap and sequencing requirements. Use Value: Delivers >90% efficiency at full load while meeting strict transient response specs for bursty data traffic loads. |
| Embedded System Core Rail | Automotive Body Control Module |
Use Scenario: Providing 1.8 V or 3.3 V core voltage for ARM Cortex-M or RISC-V SoCs in edge devices. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with precise FB reference and low-noise operation. Use Value: Supports dynamic voltage scaling and low-quiescent-current sleep modes - extending battery life in portable IoT nodes. | Use Scenario: Converting 12 V vehicle battery to 5 V for infotainment MCU and CAN transceivers. IC Role / Device Role / Timing Role: Automotive-grade power supply with wide input range and robust fault protection. Use Value: Withstands cold-crank (4.5 V) and load-dump (42 V) conditions - eliminating need for external TVS or pre-regulator. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670MR-ADJ/NOPB | Lower 3 V min input, 150 kHz switching, higher RDS(ON) (350 mΩ), no integrated boot diode. | Better suited for low-input-voltage, low-EMI applications where size is less constrained. | Select when input voltage stays above 3 V and lower switching losses outweigh need for compact magnetics. |
| TPS54302DDCR | 3.5–28 V input, 3 A output, 500 kHz, integrated high/low-side FETs, no BOOT pin required. | Higher current capability and simpler layout - but lacks 42 V rating and automotive temperature range. | Choose for 24 V systems needing >1 A or simplified synchronous design - not for 36–42 V surge-tolerant applications. |
Compared with LM22675MR-ADJ/NOPB, LM22670MR-ADJ/NOPB trades off high-voltage resilience for lower quiescent current and wider duty-cycle flexibility, while TPS54302DDCR offers higher output current and true synchronous operation but sacrifices 42 V surge tolerance and extended temperature support.
Availability
LM22675MR-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power, and embedded system applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LM22675MR-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 designing analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The LM22675MR-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use in non-isolated DC/DC conversion, emphasizing minimal external components, internal compensation, and robust operation across harsh input conditions.
FAQ
What is the minimum output voltage achievable with LM22675MR-ADJ/NOPB?
The LM22675MR-ADJ/NOPB has a feedback reference voltage of 1.285 V (±1.5%), which sets the lowest possible regulated output voltage. When configured with appropriate resistor values on the FB pin, LM22675MR-ADJ/NOPB can reliably deliver outputs as low as 1.285 V. Output voltages below this value are not supported due to internal reference limitation - attempting lower outputs results in loss of regulation and increased dropout risk.
Does LM22675MR-ADJ/NOPB require an external bootstrap diode?
No, LM22675MR-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external diode between BOOT and SW pins. This simplifies layout and improves reliability compared to controllers requiring discrete bootstrap diodes. Users must still place a 10 nF ceramic capacitor between BOOT and SW with short, low-inductance traces to ensure proper gate drive voltage generation.
Can LM22675MR-ADJ/NOPB operate with ceramic output capacitors only?
Yes, LM22675MR-ADJ/NOPB is explicitly designed to be stable with low-ESR ceramic output capacitors - a key feature highlighted in its datasheet. Unlike many older regulators requiring tantalum or electrolytic capacitors for phase margin, LM22675MR-ADJ/NOPB's internal Type III compensation ensures stability with typical 10–100 µF X5R/X7R ceramics, reducing board area and improving lifetime reliability.
What is the purpose of the NC pins on LM22675MR-ADJ/NOPB?
Pins 2 and 3 of LM22675MR-ADJ/NOPB are marked NC (No Connect) - they are not electrically bonded to any internal circuitry. Their sole function is thermal conduction: they act as mechanical thermal vias to enhance heat transfer from the die to the PCB. These pins must remain unconnected in the schematic and layout - routing traces or applying solder paste risks shorting or compromising thermal performance.
How does the enable pin (EN) behave during power-up for LM22675MR-ADJ/NOPB?
The EN pin of LM22675MR-ADJ/NOPB features a precision threshold (1.6 V typical) with 0.6 V hysteresis and a 6 µA internal pullup current. During power-up, LM22675MR-ADJ/NOPB remains disabled until EN rises above ~1.6 V; once enabled, it stays on until EN falls below ~1.0 V. This hysteresis prevents chatter near the threshold. For reliable startup, tie EN to VIN via a resistor (e.g., 470 kΩ for 42 V input) to ensure fast, noise-immune activation.
LM22675MR-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 1A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM22675MR-ADJ/NOPB FAQ
1.How can I place an order for LM22675MR-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22675MR-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 LM22675MR-ADJ/NOPB reliable?
The price and inventory of LM22675MR-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 LM22675MR-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22675MR-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22675MR-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22675MR-ADJ/NOPB?
LM22675MR-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22675MR-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 LM22675MR-ADJ/NOPB?
For technical support, including LM22675MR-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22675MR-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22675MR-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22675MR-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 LM22675MR-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22675MR-ADJ/NOPB?
All LM22675MR-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22675MR-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 LM22675MR-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22675MR-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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