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Texas Instruments LM22675MRX-ADJ/NOPB
- Part No.:
- LM22675MRX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22675MRX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,652
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Product details
Overview
LM22675MRX-ADJ/NOPB from Texas Instruments is a 42 V, 1 A adjustable-output synchronous step-down DC/DC regulator in an SO PowerPAD-8 package. It integrates a 200 mΩ N-channel MOSFET switch, operates at 500 kHz fixed frequency, delivers ±1.5% feedback reference accuracy down to 1.285 V output, and supports input voltages from 4.5 V to 42 V. It is used in industrial power rails requiring stable 3.3 V or 5 V generation from 12 V or 24 V bus supplies.
For engineers reviewing the LM22675MRX-ADJ/NOPB datasheet, LM22675MRX-ADJ/NOPB pinout, LM22675MRX-ADJ/NOPB application, or LM22675MRX-ADJ/NOPB equivalent, key selection criteria include its internally compensated voltage-mode control, integrated bootstrap diode, precision enable threshold (1.6 V typ), 25 µA shutdown current, and thermal shutdown at 150°C - all critical for robust embedded power design.
Technical Context
The LM22675MRX-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 fixed 500 kHz oscillator, minimum on-time of 100 ns, minimum off-time of 200 ns, and integrated soft-start (500 µs typ) to limit inrush current. The BOOT–SW bootstrap circuit drives the high-side MOSFET gate, requiring a 10 nF ceramic capacitor; a minimum 5 mA load ensures full bootstrap recharge during each off-cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct regulation from 12 V, 24 V, and 36 V industrial rails without pre-regulation. |
| Output Current | Up to 1 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained designs. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; enables precise 3.3 V, 5 V, or custom outputs via external resistor divider. |
| Switching Frequency | 500 kHz (±20%) - allows compact 2.2 µH inductors and low-ESR ceramic output capacitors (e.g., 22 µF ×2). |
| RDS(ON) | 200 mΩ (typ) - reduces conduction loss at 1 A, supporting >90% peak efficiency at mid-load conditions. |
| Quiescent Current | 3.4 mA (typ) - enables low-noise operation in active mode without excessive bias power overhead. |
| Shutdown Current | 25 µA (typ) - minimizes system standby power, critical for battery-backed or energy-sensitive applications. |
Pinout & Package
LM22675MRX-ADJ/NOPB is housed in an HSOP-8 (SO PowerPAD-8) package with exposed thermal pad (EP), measuring 4.89 mm × 3.90 mm. The EP must be soldered to a PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply input | Connects to SW node via 10 nF ceramic capacitor; provides gate drive voltage for internal high-side MOSFET. |
| EN | Enable control input | Logic-compatible input with 1.6 V typical turn-on threshold and 0.6 V hysteresis; pulls up internally at ~6 µA. |
| SW | Switch node output | Drives external inductor; swings from GND to VIN; requires low-inductance layout to minimize EMI and ringing. |
| FB | Feedback sensing input | High-impedance (230 nA bias) input monitoring output voltage via resistive divider; placement near output cap is critical. |
| GND | Power and signal ground | Primary return path for power stage and control circuitry; connects directly to exposed pad for thermal management. |
| VIN | Main input supply | Accepts 4.5–42 V; requires local 10 µF ceramic input capacitor placed within 5 mm of VIN and GND pins. |
| NC | No-connect terminal | Pins 2 and 3 are unconnected die pads; serve only as thermal conductors - must not be routed or biased. |
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 | Removes requirement for external bootstrap diode - simplifies layout and improves reliability in high-frequency operation. |
| Stable with ceramic capacitors | Supports low-ESR, high-frequency ceramic output caps (e.g., X5R/X7R 22 µF) - avoids bulk electrolytics and extends lifetime. |
| Precision enable with UVLO | EN pin provides accurate sequencing (1.6 V threshold) and optional external undervoltage lockout - prevents brownout operation below 4.5 V. |
| Thermal shutdown + current limit | Protects against overload and PCB overheating: trips at 150°C junction temp and limits peak switch current to 1.3–1.7 A. |
Applications
| Industrial Control Power | Telecom Datacom Supply |
|---|---|
Use Scenario: Powering PLC I/O modules and fieldbus transceivers from 24 V DC rails with tight ripple and thermal constraints. IC Role / Device Role / Timing Role: Primary non-isolated step-down regulator delivering regulated 3.3 V or 5 V to microcontroller, ADC, and RS-485 PHY. Use Value: Delivers 1 A at >90% efficiency with minimal heatsinking; integrated soft-start prevents inrush-induced bus droop during hot-swap events. | Use Scenario: Generating point-of-load 3.3 V for Ethernet PHYs and packet processors in 1U rack-mounted switches. IC Role / Device Role / Timing Role: Secondary buck converter downstream of intermediate 12 V bus, operating at 500 kHz for fast transient response. Use Value: Fixed-frequency operation enables predictable EMI filtering; ±1.5% VREF ensures compliance with IEEE 802.3 voltage tolerance specs. |
| Embedded System Core Rail | Automotive Body Control Module |
Use Scenario: Providing clean 1.8 V or 3.3 V core voltage to ARM Cortex-M7 MCU and FPGA configuration logic in portable test equipment. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with remote FB sensing to compensate for PCB trace IR drop. Use Value: 1.285 V reference enables precise low-voltage outputs; 25 µA shutdown current extends battery runtime in sleep modes. | Use Scenario: Regulating 5 V for infotainment microcontrollers and CAN transceivers in body control units powered by 12 V battery (with cold-crank tolerance). IC Role / Device Role / Timing Role: High-input-voltage buck converter with 42 V absolute max rating and automotive-grade thermal protection. Use Value: Withstands 40 V load-dump transients per ISO 7637-2; thermal shutdown at 150°C prevents failure under sealed-housing conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670MRX-ADJ/NOPB | Lower 3 V min VIN, 150 kHz switching frequency, higher RDS(ON) (340 mΩ), no integrated bootstrap diode. | Better suited for low-input-voltage, low-EMI applications where size is less critical than efficiency at light loads. | Select when input rail is ≤12 V and 500 kHz EMI is unacceptable; accept larger magnetics and external bootstrap diode. |
| TPS54302DDCR | 3.5–28 V input, 3 A output, 500 kHz, integrated high-/low-side FETs, no BOOT pin, different pinout. | Higher current capability and smaller solution size, but lacks 42 V rating and automotive temperature range. | Choose for 3 A loads or space-constrained 12 V systems; avoid where 42 V surge immunity or –40°C to 125°C operation is required. |
Compared with LM22670MRX-ADJ/NOPB, LM22675MRX-ADJ/NOPB offers superior high-VIN capability and integrated bootstrap, while TPS54302DDCR trades off voltage range for higher current and monolithic integration - making LM22675MRX-ADJ/NOPB optimal for ruggedized 24 V/36 V industrial conversion.
Availability
LM22675MRX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power, and embedded system applications requiring stable component supply, long-lifecycle support, and guaranteed automotive-grade thermal performance.
Supply support for LM22675MRX-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 technologies for industrial, automotive, and communications markets.
The LM22675MRX-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use in non-isolated DC/DC buck conversion, emphasizing minimal external components, internal compensation, and robust operation across harsh input conditions.
FAQ
What is the minimum output voltage achievable with LM22675MRX-ADJ/NOPB?
The LM22675MRX-ADJ/NOPB has a feedback reference voltage of 1.285 V (typ), which sets the lowest possible output voltage when using the adjustable version. This value is specified over temperature (–40°C to 125°C) with ±1.5% accuracy. Output voltages below 1.285 V cannot be achieved because the internal error amplifier compares FB to this fixed reference. Therefore, LM22675MRX-ADJ/NOPB is not suitable for sub-1.2 V core rails unless external circuitry is added - which is not recommended per TI's design guidelines.
Does LM22675MRX-ADJ/NOPB require an external bootstrap diode?
No, LM22675MRX-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component between BOOT and SW. This reduces bill-of-materials count and layout complexity. A 10 nF ceramic capacitor must still be placed directly between BOOT and SW pins with short, low-inductance traces. The internal diode charges this capacitor during the off-time, enabling proper high-side gate drive - a key differentiator from earlier buck controllers like the LM22670.
Can LM22675MRX-ADJ/NOPB operate with ceramic output capacitors only?
Yes, LM22675MRX-ADJ/NOPB is explicitly designed to be stable with low-ESR ceramic output capacitors, as confirmed in its datasheet Features section. It does not require tantalum or aluminum electrolytic capacitors. Typical designs use two parallel 10–22 µF X5R/X7R ceramics (e.g., 0805 or 1206) close to the FB and GND pins. This ceramic-only approach improves reliability, reduces size, and avoids aging-related capacitance drift inherent in wet electrolytics.
What is the purpose of the NC pins on LM22675MRX-ADJ/NOPB?
Pins 2 and 3 on LM22675MRX-ADJ/NOPB are marked NC (No Connect) - they are not electrically bonded to the die and serve only as thermal conductors to aid heat dissipation through the package body. These pins must remain unconnected in the schematic and layout; routing traces or applying bias to them may cause malfunction or damage. Their presence improves thermal resistance (RθJA) when soldered to copper, but they carry no signal or power function in the LM22675MRX-ADJ/NOPB circuit operation.
How does the enable pin (EN) behave during power-up and sequencing?
The EN pin of LM22675MRX-ADJ/NOPB features a precision threshold of 1.6 V (typ), with 0.6 V hysteresis, allowing controlled power sequencing. When EN rises above 1.6 V, the device starts soft-start after a brief delay; when EN falls below 1.0 V, it enters shutdown drawing only 25 µA. An internal 6 µA pullup allows EN to be left floating or tied to VIN via a resistor (e.g., 470 kΩ for 42 V input). This behavior makes LM22675MRX-ADJ/NOPB ideal for multi-rail systems where turn-on order must be enforced without external supervisors.
LM22675MRX-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- 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:
- 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
LM22675MRX-ADJ/NOPB FAQ
1.How can I place an order for LM22675MRX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22675MRX-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 LM22675MRX-ADJ/NOPB reliable?
The price and inventory of LM22675MRX-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 LM22675MRX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22675MRX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22675MRX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22675MRX-ADJ/NOPB?
LM22675MRX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22675MRX-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 LM22675MRX-ADJ/NOPB?
For technical support, including LM22675MRX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22675MRX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22675MRX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22675MRX-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 LM22675MRX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22675MRX-ADJ/NOPB?
All LM22675MRX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22675MRX-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 LM22675MRX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22675MRX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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