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Texas Instruments LM22675QMRX-5.0/NOPB
- Part No.:
- LM22675QMRX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22675QMRX-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 1A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:4,551
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Product details
Overview
LM22675QMRX-5.0/NOPB from Texas Instruments is an automotive-grade, 42 V input, 1 A synchronous step-down DC/DC regulator with fixed 5.0 V output, 500 kHz switching frequency, ±1.5% feedback reference accuracy, and integrated boot-strap diode. It delivers high efficiency (>90%) in industrial power rails and telecom point-of-load conversion.
For engineers reviewing the LM22675QMRX-5.0/NOPB datasheet, LM22675QMRX-5.0/NOPB pinout, LM22675QMRX-5.0/NOPB application, or LM22675QMRX-5.0/NOPB equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (–40°C to +125°C), internal voltage-mode compensation, precision enable threshold (1.6 V typ), and SO PowerPAD-8 thermal performance (RθJA = 60°C/W).
Technical Context
The LM22675QMRX-5.0/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 fixed 5 V output configurations, eliminating external compensation components.
It integrates a 200 mΩ N-channel MOSFET switch, bootstrap gate driver with dedicated BOOT pin, and precision enable input with 0.6 V hysteresis. Thermal shutdown activates at 150°C, and current limiting protects against overloads with foldback mode below ~1 V output during short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to 12 V/24 V automotive and industrial rails without pre-regulation. |
| Output Voltage | Fixed 5.0 V ±1.5% - eliminates external feedback divider, reduces BOM count and layout sensitivity. |
| Switching Frequency | 500 kHz (±20%) - enables compact 2.2 µH inductors and low-ESR ceramic output capacitors. |
| Max Output Current | 1 A continuous - sufficient for powering microcontrollers, sensors, and interface ICs in embedded systems. |
| Quiescent Current | 3.4 mA typical - maintains regulation under light loads without burst-mode noise or instability. |
| Standby Current | 25 µA typical - enables ultra-low-power shutdown for battery-backed subsystems. |
| Junction Temp Range | –40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood and industrial control environments. |
| RDS(ON) | 200 mΩ max - minimizes conduction loss and thermal rise at full load in SO PowerPAD-8 package. |
Pinout & Package
LM22675QMRX-5.0/NOPB uses the HSOP-8 (SO PowerPAD-8) package with 4.89 mm × 3.90 mm body and exposed thermal pad connected to GND for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply input | Drives high-side MOSFET gate via external 10 nF ceramic capacitor; requires short, low-inductance routing to SW. |
| EN | Enable control input | Logic-compatible input with 1.6 V turn-on threshold and 0.6 V hysteresis; internal 6 µA pull-up allows direct VIN tie for always-on operation. |
| SW | Power switch node | Connects to inductor and Schottky catch diode anode; swings from GND to VIN; requires tight layout to minimize EMI and ringing. |
| FB | Feedback reference input | Internally tied to 5.0 V output; no external divider needed-pins directly to VOUT for fixed-output configuration. |
| GND | Power and signal ground | Primary return path for switch current and control circuitry; must be connected to exposed pad for thermal and electrical integrity. |
| VIN | Main input supply | Accepts 4.5–42 V; requires local 10 µF ceramic input capacitor placed near pin to suppress high-frequency ripple. |
| NC (Pins 2, 3) | No-connect terminals | Not electrically bonded; serve only as thermal conductors-must remain unconnected in PCB layout. |
| EP (Exposed Pad) | Thermal and ground plane | Must be soldered to ≥1 in² copper pour tied to GND; critical for achieving RθJA = 60°C/W rating. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated boot-strap diode | Eliminates external bootstrap diode, reducing component count and PCB area while ensuring reliable high-side gate drive. |
| Internal soft-start | 500 µs typical ramp time prevents inrush current and output overshoot during power-up without external timing components. |
| AEC-Q100 Grade 1 qualified | Validated for automotive applications operating from –40°C to +125°C junction temperature with full production testing. |
| Stable with ceramic output caps | Designed for low-ESR ceramic capacitors (e.g., 22 µF X5R); avoids instability risks associated with electrolytic or tantalum alternatives. |
| WEBENCH® enabled | Full design support in TI's WEBENCH tool including component selection, thermal simulation, and schematic generation for LM22675QMRX-5.0/NOPB. |
| Precision enable with UVLO | EN pin doubles as programmable undervoltage lockout-enables system-level brownout protection using external resistor divider. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
Use Scenario: Powering CAN transceivers, LIN drivers, and sensor interfaces in door modules and lighting controllers. IC Role / Device Role / Timing Role: Primary 5 V buck regulator supplying logic-level peripherals from 12 V battery rail with cold-crank tolerance down to 4.5 V. Use Value: AEC-Q100 qualification ensures reliability across temperature cycling and vibration; 500 kHz switching enables compact filtering for EMI-constrained automotive enclosures. | Use Scenario: Generating stable 5 V for digital I/O isolators, ADC references, and microcontroller cores in programmable logic controllers. IC Role / Device Role / Timing Role: Point-of-load regulator converting 24 V field bus to isolated 5 V logic supply with high line regulation (±0.2%) over 18–32 V input range. Use Value: Internal compensation and ±1.5% VREF eliminate tuning effort; SO PowerPAD-8 thermal performance sustains 1 A load at 70°C ambient without derating. |
| Telecom Remote Radio Unit | Medical Diagnostic Sensor Hub |
Use Scenario: Providing clean 5 V bias to RF front-end ICs and analog-to-digital converters in outdoor base station radios. IC Role / Device Role / Timing Role: Secondary regulated supply derived from 48 V intermediate bus, delivering low-noise 5 V with <10 mVpp ripple at full load. Use Value: Fixed 5 V output avoids feedback resistor drift errors; 500 kHz frequency allows small 2.2 µH shielded inductors compatible with dense RF layouts. | Use Scenario: Powering precision analog front-ends and low-power microcontrollers in portable ultrasound or ECG sensor nodes. IC Role / Device Role / Timing Role: Main system regulator converting primary Li-ion or 12 V adapter input to tightly regulated 5 V for mixed-signal signal chain. Use Value: 25 µA standby current extends battery life; thermal shutdown and current limit ensure safe operation during probe disconnection or fault events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670QMRX-5.0/NOPB | Lower 3 V min input, 300 kHz fSW, same 5 V output and SO PowerPAD-8 package. | Better suited for low-input applications (e.g., 5 V USB-derived rails); less suitable for 12/24 V automotive due to lower VIN max (36 V vs 42 V). | Select when input never exceeds 36 V and lower switching frequency is acceptable for larger magnetics. |
| TPS54302DDAR | 3.5–28 V input, 3 A output, 500 kHz, adjustable output (requires FB divider), SON-8 package. | Higher current capability but lacks AEC-Q100 qualification and fixed 5 V option; requires external compensation. | Choose for non-automotive 3 A designs where board space permits SON-8 and flexibility outweighs qualification needs. |
Compared with LM22670QMRX-5.0/NOPB, LM22675QMRX-5.0/NOPB supports higher input voltage (42 V vs 36 V) and faster switching (500 kHz vs 300 kHz), enabling smaller passives in automotive 24 V systems; versus TPS54302DDAR, it trades current headroom (1 A vs 3 A) for AEC-Q100 compliance and fixed-output simplicity in safety-critical 5 V rails.
Availability
LM22675QMRX-5.0/NOPB is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and telecom remote radio units requiring stable component supply with long-term lifecycle assurance.
Supply support for LM22675QMRX-5.0/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 LM22675 product line delivers SIMPLE SWITCHER® buck regulators optimized for ease of use, minimal external components, and robust operation in harsh environments-from factory floors to vehicle engine compartments.
FAQ
What is the minimum input voltage required for stable operation of the LM22675QMRX-5.0/NOPB?
The LM22675QMRX-5.0/NOPB requires a minimum input voltage of 4.5 V to maintain regulation at 5.0 V output. Below this threshold, undervoltage lockout (UVLO) disables the device. The rising UVLO threshold is 4.3 V (typ), and the falling threshold is 3.9 V (typ). For applications with input rails that dip below 4.5 V-such as automotive cold-crank-the EN pin can be used with an external resistor divider to implement a custom UVLO threshold, ensuring controlled startup and shutdown behavior specific to the system's power architecture. This method is explicitly supported in the LM22675QMRX-5.0/NOPB datasheet.
Does the LM22675QMRX-5.0/NOPB require an external feedback resistor network?
No, the LM22675QMRX-5.0/NOPB does not require an external feedback resistor network. It is the fixed 5.0 V output variant, meaning the internal feedback divider is factory-trimmed and connected internally between the FB pin and the error amplifier reference. The FB pin is intended to be connected directly to the output capacitor or load node. Adding external resistors would disrupt the factory-calibrated 5.0 V regulation and degrade accuracy. This fixed-output architecture simplifies design, improves long-term stability, and eliminates resistor tolerance and temperature drift effects that affect adjustable versions like the LM22675-ADJ.
Can the LM22675QMRX-5.0/NOPB be used in a buck-boost configuration?
No, the LM22675QMRX-5.0/NOPB is designed exclusively for step-down (buck) operation and cannot be configured as a buck-boost regulator. Its internal architecture-featuring a single N-channel high-side MOSFET switch, grounded synchronous rectifier path, and voltage-mode control optimized for buck topology-does not support inverting or boost functionality. While earlier LM22675 family documentation referenced inverting buck-boost applications, that capability was removed from the official datasheet starting with Revision L (November 2014), and the LM22675QMRX-5.0/NOPB data sheet contains no design guidance, schematics, or characterization for such use. Attempting buck-boost operation may result in failure to regulate or damage to the IC.
What thermal performance can be expected from the LM22675QMRX-5.0/NOPB in a standard PCB layout?
With proper layout-including soldering the exposed thermal pad (EP) to ≥1 in² of inner-layer or bottom-side copper connected to GND-the LM22675QMRX-5.0/NOPB achieves a junction-to-ambient thermal resistance (RθJA) of 60°C/W. At 1 A load and 12 V input, typical power dissipation is ~0.7 W, resulting in a ~42°C junction-to-ambient rise above ambient temperature. This allows full 1 A operation up to 70°C ambient without derating. Performance degrades significantly if the EP is left unconnected or routed with insufficient copper area-RθJA may exceed 100°C/W in such cases, risking thermal shutdown. Layout guidelines in the LM22675QMRX-5.0/NOPB datasheet emphasize thermal pad connection, input capacitor placement, and SW node routing to maintain this rating.
Is the LM22675QMRX-5.0/NOPB pin-compatible with other members of the LM22675 family?
Yes, the LM22675QMRX-5.0/NOPB is pin-compatible with all LM22675 variants in the HSOP-8 (SO PowerPAD-8) package, including LM22675-ADJ, LM22675-3.3, LM22675-Q1-5.0, and LM22675-Q1-ADJ. Pin functions (VIN, EN, SW, BOOT, FB, GND, NC, EP) and physical footprint are identical across these parts. However, functional differences exist: the -ADJ version requires an external feedback divider, while the -5.0 versions have internal 5 V reference; Q1-grade parts include AEC-Q100 qualification and extended temperature screening. Therefore, while PCB layout is interchangeable, firmware, thermal design, and qualification requirements must be verified per application before substitution.
LM22675QMRX-5.0/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:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- 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:
- 8-SO PowerPad
LM22675QMRX-5.0/NOPB FAQ
1.How can I place an order for LM22675QMRX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22675QMRX-5.0/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 LM22675QMRX-5.0/NOPB reliable?
The price and inventory of LM22675QMRX-5.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM22675QMRX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM22675QMRX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22675QMRX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22675QMRX-5.0/NOPB?
LM22675QMRX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22675QMRX-5.0/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 LM22675QMRX-5.0/NOPB?
For technical support, including LM22675QMRX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22675QMRX-5.0/NOPB requirements.
6.How does Aetrix verify that LM22675QMRX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22675QMRX-5.0/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 LM22675QMRX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM22675QMRX-5.0/NOPB?
All LM22675QMRX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22675QMRX-5.0/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 LM22675QMRX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM22675QMRX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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