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Texas Instruments LM22670MRX-5.0/NOPB
- Part No.:
- LM22670MRX-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22670MRX-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,441
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Product details
Overview
LM22670MRX-5.0/NOPB from Texas Instruments is a 42-V input, 3-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 converting 12 V or 24 V inputs to stable 5 V for microcontrollers and peripherals.
For engineers reviewing the LM22670MRX-5.0/NOPB datasheet, LM22670MRX-5.0/NOPB pinout, LM22670MRX-5.0/NOPB application, or LM22670MRX-5.0/NOPB equivalent, key selection criteria include its 4.5–42 V wide input range, internal voltage-mode compensation, thermal shutdown protection, and SO PowerPAD™-8 package with exposed pad for enhanced thermal performance.
Technical Context
The LM22670MRX-5.0/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain across input variations. Its internal Type III compensation is optimized for fixed 5 V output, eliminating external compensation components.
It integrates a 100-mΩ N-channel MOSFET switch and uses a bootstrap capacitor between BOOT and SW to drive the high-side gate. Minimum on-time (100 ns) and off-time (100 ns) enable wide VIN/VOUT ratios and support self-synchronization via the RT/SYNC pin.
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, and 36 V industrial and automotive supply rails without pre-regulation. |
| Output Voltage | Fixed 5.0 V ±1.5% - eliminates external feedback resistors; ensures accurate logic-level supply for MCU, FPGA, and interface ICs. |
| Max Output Current | 3 A - sufficient for powering multiple digital loads including ARM Cortex-M cores and peripheral ICs simultaneously. |
| Switching Frequency | 500 kHz (default), adjustable 200–1000 kHz - enables compact magnetics and ceramic output capacitors while avoiding AM band EMI. |
| RDS(ON) | 100 mΩ (SO PowerPAD™-8) - reduces conduction loss at full load, supporting >90% peak efficiency at 12 VIN/5 VOUT. |
| Junction Temp Range | –40°C to +125°C - qualified for extended industrial and automotive under-hood environments without derating. |
| Quiescent Current | 3.4 mA (active), 25 µA (shutdown) - enables low-power standby modes in battery-backed or energy-conscious systems. |
Pinout & Package
LM22670MRX-5.0/NOPB is housed in an SO PowerPAD™-8 (DDA) package measuring 4.89 mm × 3.90 mm with an exposed thermal pad that must be soldered to PCB ground for optimal thermal performance (RθJA = 60°C/W with 1 in² copper).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node | Connects to inductor and catch diode/capacitor; carries high di/dt pulsed current; requires short, low-inductance layout. |
| 2 VIN | Main Input Supply | Accepts 4.5–42 V; routes to internal LDO, gate driver, and high-side MOSFET; requires local 10 µF ceramic input capacitor. |
| 3 BOOT | Bootstrap Supply | Connects to SW via 10 nF ceramic capacitor; supplies gate drive voltage for high-side MOSFET; critical for proper turn-on. |
| 4 GND | Power Ground | Analog and power return; ties to exposed pad; forms low-impedance path for switch current and thermal dissipation. |
| 5 RT/SYNC | Oscillator Control | Configures frequency (200–1000 kHz) with resistor-to-GND or enables synchronization to external clock ≥500 kHz. |
| 6 FB | Feedback Input | Internally tied to 5.0 V reference; not connected externally for -5.0 version - simplifies layout and improves noise immunity. |
| 7 EN | Enable Control | Logic-compatible input with 1.6 V threshold and 0.6 V hysteresis; allows precise power sequencing and UVLO override. |
| 8 NC | No Connect | Unbonded pin; must remain unconnected per datasheet - no routing or thermal tie required. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates external compensation network - reduces BOM count and design iteration time for fixed 5 V output. |
| Integrated boot-strap diode | Removes need for external bootstrap diode - simplifies layout, improves reliability, and reduces component count. |
| Stable with low-ESR ceramic capacitors | Enables use of compact, high-reliability X7R/X5R MLCCs instead of bulkier electrolytics - ideal for space-constrained designs. |
| Precision enable with UVLO override | Allows system-level sequencing and programmable undervoltage lockout using resistor divider - prevents brownout operation. |
| Thermal shutdown & current limiting | Protects against sustained overload and PCB overheating without external circuitry - ensures robust field operation. |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Powering isolated CAN transceivers, analog sensor conditioners, and digital I/O drivers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 5 V buck regulator supplying logic and interface circuitry from 24 V DC bus. Use Value: Wide 4.5–42 V input range accommodates 24 V nominal with ±25% line transients; 125°C junction rating supports uncooled enclosure mounting. |
Use Scenario: Generating 5 V for microcontroller, LIN transceiver, and LED drivers in door module or lighting control unit. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter replacing linear regulator to improve thermal performance and efficiency. Use Value: 3 A capability supports burst-current loads (e.g., solenoid drivers); integrated soft-start prevents inrush-induced reset events. |
| Telecom Remote Radio Unit | Medical Point-of-Care Monitor |
|
Use Scenario: Converting -48 V telecom supply (via intermediate 12 V stage) to clean 5 V for FPGA configuration and ADC reference. IC Role / Device Role / Timing Role: Secondary-stage buck regulator delivering low-noise, tightly regulated 5 V rail. Use Value: 500 kHz switching enables small 2.2 µH inductors and 22 µF ceramic output caps; ±1.5% VFB ensures ADC reference stability. |
Use Scenario: Providing isolated 5 V for patient-connected digital subsystems (touchscreen controller, USB PHY, memory) from main 12 V battery supply. IC Role / Device Role / Timing Role: Safety-critical power conversion stage requiring high reliability and predictable fault behavior. Use Value: Thermal shutdown and current limit provide fail-safe response during short-circuit faults; 25 µA shutdown current extends battery life in standby mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22671MRX-5.0/NOPB | Same pinout and electrical specs, but rated only to 105°C junction temperature (vs. 125°C). | Suitable for commercial/industrial ambient temperatures ≤85°C; not qualified for extended automotive or high-temp industrial use. | Select when thermal margin is sufficient and cost sensitivity outweighs extended temperature requirement. |
| TPS54340DDAR | 42 V, 3.5 A, adjustable output; requires external feedback resistors and compensation; 2.2 MHz max frequency. | Better suited for ultra-compact designs needing higher switching frequency; lacks fixed 5 V option and integrated boot diode. | Choose when adjustable output or smaller inductors are prioritized over simplicity and fixed-voltage assurance. |
Compared with LM22670MRX-5.0/NOPB, LM22671MRX-5.0/NOPB trades junction temperature headroom for lower cost in less demanding thermal environments, while TPS54340DDAR offers higher frequency and current but increases design complexity and component count.
Availability
LM22670MRX-5.0/NOPB is available at Aetrix Electronics and suitable for industrial control, automotive body electronics, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM22670MRX-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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability DC/DC conversion.
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 rugged operating specifications are essential.
FAQ
What is the maximum input voltage rating for LM22670MRX-5.0/NOPB?
The absolute maximum input voltage for LM22670MRX-5.0/NOPB is 43 V, with recommended continuous operation limited to 42 V. This rating allows reliable operation directly from 24 V and 36 V industrial buses, including worst-case transients defined by ISO 7637-2 or IEC 61000-4-5 standards. Exceeding 43 V risks permanent damage to the internal N-channel MOSFET and gate driver circuitry.
Does LM22670MRX-5.0/NOPB require external feedback resistors?
No, LM22670MRX-5.0/NOPB does not require external feedback resistors. Its FB pin is internally connected to a precision 5.0 V reference with ±1.5% accuracy across –40°C to +125°C, enabling true fixed-output operation. This eliminates resistor tolerance errors, layout sensitivity, and thermal drift concerns associated with external dividers - a key advantage over adjustable regulators like LM22670-ADJ.
Can LM22670MRX-5.0/NOPB synchronize to an external clock?
Yes, LM22670MRX-5.0/NOPB can synchronize to an external clock applied to the RT/SYNC pin. The device detects synchronization mode during startup if the pin voltage is forced above ~0.8 V (e.g., by a CMOS clock signal). Valid sync frequencies range from >500 kHz up to 1 MHz, with rising-edge triggering. Loss of the external clock causes automatic fallback to the internal 500 kHz oscillator.
What thermal pad connection is required for LM22670MRX-5.0/NOPB?
The exposed thermal pad on LM22670MRX-5.0/NOPB (SO PowerPAD™-8 package) must be soldered to a solid PCB ground plane with ≥4 thermal vias (0.3 mm diameter) connecting to inner-layer ground planes. This achieves the specified RθJA of 60°C/W (with 1 in² copper) and prevents junction temperature exceedance at full 3 A load. Leaving the pad unconnected degrades thermal performance by >40°C at rated current.
Is LM22670MRX-5.0/NOPB qualified for automotive applications?
No, LM22670MRX-5.0/NOPB is not AEC-Q100 qualified. It is the commercial/industrial variant. For automotive use, TI offers the LM22670QMRX-5.0/NOPB (Q1 grade), which is AEC-Q100 Grade 1 qualified (–40°C to +125°C) and manufactured under automotive-specific process controls. The two share identical electrical specs and pinout but differ in qualification, test flow, and traceability documentation.
LM22670MRX-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:
- Active
- 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:
- 3A
- 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
LM22670MRX-5.0/NOPB FAQ
1.How can I place an order for LM22670MRX-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22670MRX-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 LM22670MRX-5.0/NOPB reliable?
The price and inventory of LM22670MRX-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 LM22670MRX-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM22670MRX-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22670MRX-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22670MRX-5.0/NOPB?
LM22670MRX-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22670MRX-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 LM22670MRX-5.0/NOPB?
For technical support, including LM22670MRX-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22670MRX-5.0/NOPB requirements.
6.How does Aetrix verify that LM22670MRX-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22670MRX-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 LM22670MRX-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM22670MRX-5.0/NOPB?
All LM22670MRX-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22670MRX-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 LM22670MRX-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM22670MRX-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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