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Texas Instruments LM22673MR-5.0/NOPB
- Part No.:
- LM22673MR-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22673MR-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:523
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Product details
Overview
LM22673MR-5.0/NOPB from Texas Instruments is a 42 V, 3 A synchronous step-down DC/DC regulator in an HSOP-8 PowerPAD package, featuring fixed 5.0 V output, 500 kHz switching frequency, ±1.5% feedback reference accuracy, and integrated bootstrap diode - used to convert industrial 12 V/24 V rails to stable 5 V logic supply.
For engineers reviewing the LM22673MR-5.0/NOPB datasheet, LM22673MR-5.0/NOPB pinout, LM22673MR-5.0/NOPB application, or LM22673MR-5.0/NOPB equivalent, key selection considerations include input voltage range (4.5–42 V), thermal performance with exposed pad, adjustable current limit via IADJ pin, soft-start timing control, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The LM22673MR-5.0/NOPB implements voltage-mode PWM control with input voltage feedforward for stable loop gain across wide VIN variations. Its internal Type III compensation is optimized for fixed 5 V output, eliminating external compensation components.
It integrates a 120 mΩ N-channel MOSFET switch, uses a bootstrap capacitor between BOOT and SW for high-side gate drive, and enforces minimum on-time (100 ns) and off-time (200 ns) to ensure current sensing integrity and bootstrap recharge - directly constraining usable input-to-output voltage ratios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct regulation from unregulated 12 V, 24 V, or 36 V industrial/automotive rails without pre-regulation. |
| Output Voltage | Fixed 5.0 V ±1.5% - eliminates external feedback divider; FB pin connected directly to VOUT for minimal BOM count. |
| Switching Frequency | 500 kHz - enables compact magnetics and ceramic capacitors; balances efficiency vs. EMI and transient response. |
| Max Output Current | 3 A continuous - defined under thermal limits; derates above 85°C ambient due to RθJA = 60°C/W (HSOP-8). |
| Switch RDS(ON) | 120 mΩ (typ) - determines conduction loss at full load; impacts thermal design and efficiency at high duty cycles. |
| Soft-Start Time | Adjustable via SS pin capacitor - default ~500 µs; prevents inrush current; extended with 100 nF–1 µF external cap. |
| Current Limit | Programmable via IADJ pin resistor - default 4.2 A (typ); adjustable down to ~3.35 A; protects against overload and short-circuit. |
Pinout & Package
LM22673MR-5.0/NOPB is housed in an HSOP-8 package with exposed thermal pad (4.89 mm × 3.90 mm), requiring solder connection of the exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node Output | Drives external inductor; swings from GND to VIN; requires low-inductance layout to minimize ringing and EMI. |
| 2 VIN | Main Input Supply | Connects to bulk input capacitor; must be decoupled close to pin; supports 4.5–42 V operation. |
| 3 BOOT | Bootstrap Supply | Connects to 10 nF ceramic cap between BOOT and SW; supplies gate drive for internal high-side MOSFET. |
| 4 GND | Power Ground | System return path; ties to exposed pad; must be low-impedance connection to minimize noise and thermal resistance. |
| 5 IADJ | Current Limit Adjust | Resistor to GND sets peak switch current; floating defaults to 4.2 A; accuracy ±35%/–25% when adjusted. |
| 6 FB | Feedback Input | Internally biased to 5.0 V reference; connected directly to VOUT for fixed-output operation. |
| 7 SS | Soft-Start Control | Capacitor to GND extends startup ramp; internal 50 µA current source charges external cap for controlled VOUT rise. |
| 8 NC | No Connect | Not electrically connected; serves as thermal conductor only; must be left unconnected or tied to GND per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Internally Compensated Control Loop | Eliminates external compensation network; optimized for fixed 5 V output, reducing design time and component count. |
| Stable with Low-ESR Ceramic Capacitors | Enables use of compact, high-reliability MLCCs instead of electrolytics - critical for space-constrained industrial and telecom designs. |
| Integrated Bootstrap Diode | Removes need for external bootstrap diode; simplifies layout and improves reliability in high-frequency buck topologies. |
| Adjustable Soft-Start | Prevents input inrush and output overshoot; programmable from ~500 µs to >10 ms using single external capacitor. |
| Thermal Shutdown & Cycle-by-Cycle Current Limit | Protects device during overload or poor heatsinking; shuts down at 150°C junction; recovers at ~135°C. |
Applications
| Industrial PLC Power Supply | Telecom Line Card Bias |
|---|---|
Use Scenario: Regulating 24 V backplane rail to clean 5 V for microcontroller, FPGA I/O, and interface ICs in programmable logic controllers. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering regulated 5 V at up to 3 A with high line/load regulation (>90% efficiency at 2 A). Use Value: Enables single-stage conversion from 24 V without pre-regulator; exposed pad ensures thermal stability in sealed enclosures. | Use Scenario: Generating 5 V bias for Ethernet PHYs, SFP+ transceivers, and management controllers on telecom line cards with 48 V input. IC Role / Device Role / Timing Role: High-voltage input buck regulator supporting wide input range (4.5–42 V) while maintaining tight 5 V output tolerance under dynamic load steps. Use Value: Withstands 42 V max input and delivers fast transient response due to 500 kHz switching and internal compensation. |
| Automotive Body Control Module | Embedded System Main Rail |
Use Scenario: Converting 12 V battery rail (with load dump up to 42 V) to stable 5 V for MCU, CAN transceivers, and sensors in body electronics. IC Role / Device Role / Timing Role: Automotive-grade capable (Q1 variant exists); handles cold-crank (4.5 V) and load-dump (42 V) conditions with robust UVLO (4.3 V turn-on). Use Value: Fixed 5 V output avoids feedback resistor drift; ±1.5% reference ensures reliable logic-level compliance across temperature. | Use Scenario: Providing main 5 V rail for ARM-based embedded systems with burst loads (e.g., Wi-Fi, USB peripherals) in medical or test equipment. IC Role / Device Role / Timing Role: Step-down regulator with adjustable current limit (via IADJ) to match system peak demand and avoid overdesigning magnetics. Use Value: Programmable soft-start prevents brownout during simultaneous peripheral power-up; supports ceramic output caps for low-profile layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22672MR-5.0/NOPB | 2 A rated version; same pinout, package, and features but lower current limit and RDS(ON) = 160 mΩ. | Suitable where peak load ≤2 A; lower thermal stress but insufficient for 3 A continuous loads. | Select when system max load is ≤2 A and board space/thermal margin is constrained. |
| TPS54340DDAR | 3 A, 42 V buck with adjustable frequency (100–2500 kHz); no integrated bootstrap diode; requires external diode. | Offers frequency synchronization and higher flexibility but increases BOM and layout complexity. | Choose when EMI filtering or multi-rail synchronization is required; not drop-in compatible due to different pinout and external diode need. |
Compared with LM22672MR-5.0/NOPB, the LM22673MR-5.0/NOPB delivers 50% higher current capability in identical footprint; versus TPS54340DDAR, it reduces component count with integrated bootstrap diode but lacks frequency sync - making it optimal for cost-sensitive, fixed-frequency 3 A applications.
Availability
LM22673MR-5.0/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power, and automotive body electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM22673MR-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 LM22673MR-5.0/NOPB 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 input voltage handling are essential.
FAQ
What is the maximum input voltage rating for LM22673MR-5.0/NOPB?
The absolute maximum input voltage for LM22673MR-5.0/NOPB is 43 V, but the recommended operating range is 4.5 V to 42 V. Operation at 42 V is supported across the full –40°C to 125°C junction temperature range, making it suitable for automotive load-dump and industrial 36 V rail applications. Exceeding 42 V risks violating recommended conditions and may trigger UVLO shutdown or damage.
Does LM22673MR-5.0/NOPB require an external feedback resistor divider?
No, LM22673MR-5.0/NOPB does not require an external feedback resistor divider because it features a factory-trimmed internal reference set to 5.0 V. The FB pin is connected directly to the output capacitor for fixed 5 V regulation. This eliminates resistor tolerance errors and saves board space - unlike the LM22673-ADJ variant, which requires an external divider for adjustable outputs.
How is thermal performance managed in the HSOP-8 PowerPAD package of LM22673MR-5.0/NOPB?
LM22673MR-5.0/NOPB uses an HSOP-8 package with an exposed thermal pad that must be soldered to a large copper pour tied to system ground. With RθJA = 60°C/W, proper PCB thermal design - including ≥4 thermal vias under the pad connected to inner-layer ground planes - is essential to maintain junction temperature below 125°C at 3 A load. Thermal shutdown activates at 150°C to prevent damage.
Can the current limit of LM22673MR-5.0/NOPB be reduced below the default value?
Yes, the current limit of LM22673MR-5.0/NOPB can be reduced using a resistor between the IADJ pin and GND. With no resistor, the default peak switch current is 4.2 A (typ). Adding a resistor sets a lower threshold - e.g., ~3.35 A minimum - though accuracy degrades to +35%/–25%. The IADJ pin voltage is held at ~0.8 V internally, enabling predictable scaling via Ohm's Law.
Is LM22673MR-5.0/NOPB pin-compatible with other members of the LM2267x family?
LM22673MR-5.0/NOPB shares the same HSOP-8 PowerPAD pinout and footprint with LM22672MR-5.0/NOPB and LM22673MR-ADJ/NOPB, enabling layout reuse. However, the -ADJ variant requires external feedback resistors and has different FB pin behavior, while the LM22672 variant has lower current capability and higher RDS(ON). Electrical compatibility depends on application requirements, not just pin alignment.
LM22673MR-5.0/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:
- 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
LM22673MR-5.0/NOPB FAQ
1.How can I place an order for LM22673MR-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22673MR-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 LM22673MR-5.0/NOPB reliable?
The price and inventory of LM22673MR-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 LM22673MR-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM22673MR-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22673MR-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22673MR-5.0/NOPB?
LM22673MR-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22673MR-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 LM22673MR-5.0/NOPB?
For technical support, including LM22673MR-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22673MR-5.0/NOPB requirements.
6.How does Aetrix verify that LM22673MR-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22673MR-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 LM22673MR-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM22673MR-5.0/NOPB?
All LM22673MR-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22673MR-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 LM22673MR-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM22673MR-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM22673MR-5.0/NOPB Tags
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