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Texas Instruments LM22673MRE-5.0/NOPB
- Part No.:
- LM22673MRE-5.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22673MRE-5.0/NOPB.pdf
- Description:
- IC REG BUCK 5V 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:988
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Product details
Overview
LM22673MRE-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 120 mΩ N-channel MOSFET in HSOP-8 PowerPAD package. It delivers high efficiency (>90%) in industrial power rails converting 12 V or 24 V inputs to stable 5 V for microcontroller core logic.
For engineers reviewing the LM22673MRE-5.0/NOPB datasheet, LM22673MRE-5.0/NOPB pinout, LM22673MRE-5.0/NOPB application, or LM22673MRE-5.0/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), thermal performance in HSOP-8 exposed-pad package, adjustable current limit via IADJ pin, soft-start timing control, and internal voltage-mode compensation eliminating external loop components.
Technical Context
The LM22673MRE-5.0/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain across wide VIN variations. Its internal type III compensation network is optimized for fixed 5 V output, enabling stable operation with low-ESR ceramic output capacitors without external compensation components.
It integrates a bootstrap gate driver with dedicated BOOT/SW pins to drive the high-side N-channel MOSFET, requiring a 10 nF ceramic capacitor between BOOT and SW. Minimum on-time (100 ns) and off-time (200 ns) constraints define practical input-output voltage conversion limits and ensure reliable boot-capacitor recharge under minimum load conditions.
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 industrial rails and automotive battery transients. |
| Output Voltage | Fixed 5.0 V ±1.5% - eliminates external feedback divider; enables plug-and-play 5 V supply for MCU peripherals. |
| Max Output Current | 3 A - sufficient for powering ARM Cortex-M7 microcontrollers with DDR memory interfaces. |
| Switching Frequency | 500 kHz - allows compact 2.2 µH inductors and 22 µF ceramic output capacitors; balances size vs. EMI. |
| RDS(ON) | 120 mΩ (PFM package) - reduces conduction loss at full load; junction-to-ambient θJA = 22°C/W enables 3 A continuous operation with minimal heatsinking. |
| Soft-Start Time | Adjustable via SS pin capacitor - default ~500 µs; extended to >10 ms with 1 µF external capacitor for inrush control. |
| Operating Junction Temp | –40°C to +125°C - qualified for industrial and automotive under-hood environments per LM22673-Q1 spec alignment. |
Pinout & Package
LM22673MRE-5.0/NOPB uses the HSOP-8 PowerPAD (exposed pad) package (4.89 mm × 3.90 mm), where the exposed pad must be soldered to a PCB thermal plane connected to GND for optimal thermal performance (θJA = 22°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SW | Switch Node | Drives external inductor; swings from GND to VIN; requires low-inductance layout to minimize ringing. |
| 2 VIN | Input Supply | Primary power input (4.5–42 V); bypass with ≥10 µF ceramic capacitor near pin. |
| 3 BOOT | Bootstrap Supply | Connects to SW via 10 nF ceramic capacitor; supplies gate drive for internal high-side MOSFET. |
| 4 GND | Power Ground | System return path; tied to exposed pad; must be low-impedance copper pour. |
| 5 IADJ | Current Limit Adjust | Resistor to GND sets peak switch current (3.35–5.5 A); floating defaults to 4.2 A typical. |
| 6 FB | Feedback Input | Internally connected to 5.0 V reference; shorted directly to VOUT for fixed-output operation. |
| 7 SS | Soft-Start Control | Sinks 50 µA current; external capacitor sets ramp time; reset during UVLO or thermal shutdown. |
| 8 NC | No Connect | Not electrically bonded; serves as thermal conductor only; must be left unconnected or grounded. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Boot-Strap Diode | Eliminates external bootstrap diode; reduces BOM count and layout area while maintaining gate drive integrity. |
| Adjustable Current Limit | Single resistor from IADJ to GND scales peak switch current from 3.35 A to 5.5 A - enables derating for reliability or smaller magnetics. |
| Stable with Ceramic Capacitors | Internal compensation ensures stability with low-ESR 22 µF X5R/X7R ceramics - avoids costly tantalum or electrolytic capacitors. |
| UVLO with Hysteresis | Turn-on at 4.3 V, turn-off at 3.9 V - prevents erratic startup during brownout conditions on 5 V or 12 V input rails. |
| Thermal Shutdown | Activates at 150°C junction temperature; auto-restarts at ~135°C - protects against sustained overload or poor heatsinking. |
Applications
| Industrial PLC I/O Module | Telecom Remote Radio Unit |
|---|---|
Use Scenario: Powers isolated digital I/O drivers and analog front-end ADCs in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Primary 5 V buck regulator delivering 2.5 A continuous to mixed-signal subsystems with transient immunity to 42 V surges. Use Value: Internal 120 mΩ MOSFET and 500 kHz switching enable compact 12 mm × 12 mm power stage meeting IEC 61000-4-5 surge immunity requirements. |
Use Scenario: Supplies 5 V to FPGA configuration memory and SerDes transceivers in outdoor 4G/5G base station remote radio heads. IC Role / Device Role / Timing Role: Point-of-load regulator converting 24 V backplane to noise-sensitive 5 V domain with <100 mV line regulation error. Use Value: ±1.5% VREF accuracy and –40°C to +125°C operation ensure consistent FPGA configuration voltage across environmental extremes. |
| Automotive Body Control Module | Embedded Medical Sensor Hub |
Use Scenario: Generates 5 V for CAN FD transceivers, LIN controllers, and LED drivers in vehicle door modules. IC Role / Device Role / Timing Role: Robust 5 V supply compliant with ISO 7637-2 pulse 5a (120 V/100 ms) and AEC-Q100 Grade 1 requirements. Use Value: 42 V absolute max rating and internal thermal shutdown prevent latch-up during load-dump events in 12 V automotive systems. |
Use Scenario: Powers low-noise analog signal chains (instrumentation amps, sigma-delta ADCs) and BLE SoCs in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-ripple 5 V source with soft-start limiting inrush into 1000 µF bulk capacitance during battery-powered cold start. Use Value: Adjustable soft-start via SS pin capacitor enables controlled 50–500 ms ramp, preventing battery sag below 3.0 V cutoff threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22674MRE-5.0/NOPB | Same pinout, 42 V/3 A, but SO PowerPAD package (θJA = 60°C/W vs. 22°C/W); RDS(ON) = 100 mΩ. | Lower thermal performance requires larger copper area or forced air for 3 A continuous; better suited for space-constrained non-thermal-limited designs. | Select when board layout prioritizes footprint over thermal headroom, and ambient temperature remains <60°C. |
| TPS54340DDAR | 42 V/3.5 A, 500 kHz, but requires external compensation; no IADJ pin; FB reference = 0.8 V. | Needs external RC network for stability; higher design effort; supports lower output voltages (down to 0.8 V) not needed for fixed 5 V. | Choose only if multi-output system requires shared compensation or sub-5 V rails; adds complexity versus LM22673MRE-5.0/NOPB's plug-and-play 5 V. |
Compared with LM22674MRE-5.0/NOPB, the LM22673MRE-5.0/NOPB offers superior thermal dissipation in HSOP-8 PowerPAD, enabling full 3 A output at 85°C ambient without derating. Versus TPS54340DDAR, it eliminates compensation design risk and simplifies layout by integrating all control functions and references required for fixed 5 V generation.
Availability
LM22673MRE-5.0/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom infrastructure, and automotive body electronics requiring stable component supply with long-term lifecycle assurance.
Supply support for LM22673MRE-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 ICs, with decades of expertise in high-reliability DC/DC conversion.
The LM22673 product line delivers SIMPLE SWITCHER® step-down regulators targeting rugged industrial and automotive applications where wide input range, integrated FETs, and robust protection features are mandatory.
FAQ
What is the recommended input capacitor for LM22673MRE-5.0/NOPB?
The LM22673MRE-5.0/NOPB requires a minimum 10 µF X5R/X7R ceramic capacitor placed as close as possible to the VIN and GND pins. TI recommends pairing it with a 1 µF ceramic for high-frequency decoupling. Total effective capacitance must sustain 3 A load steps without dropping below 4.5 V to avoid UVLO triggering during transients.
Can LM22673MRE-5.0/NOPB operate with an input voltage below 4.5 V?
No. The LM22673MRE-5.0/NOPB has a guaranteed minimum operating input voltage of 4.5 V per its Recommended Operating Conditions. Below this, undervoltage lockout (UVLO) disables switching - the rising UVLO threshold is 4.3 V typical, with 0.4 V hysteresis. Operation below 4.5 V is not characterized or supported.
How is the current limit adjusted on LM22673MRE-5.0/NOPB?
The LM22673MRE-5.0/NOPB current limit is set by connecting a resistor between the IADJ pin and GND. A floating IADJ defaults to 4.2 A typical. With resistor RIADJ, peak current scales per Figure 12 in the datasheet: 3.35 A at 100 kΩ down to 5.5 A at 10 kΩ. Accuracy degrades to ±35%/–25% when adjusted.
Does LM22673MRE-5.0/NOPB require an external bootstrap diode?
No. The LM22673MRE-5.0/NOPB integrates a bootstrap diode, eliminating the need for an external component. A 10 nF ceramic capacitor must still be placed between BOOT and SW pins to supply gate drive voltage for the internal high-side MOSFET - this is explicitly confirmed in Section 7.3.3 of the SNVS586O datasheet.
What is the thermal resistance (θJA) of LM22673MRE-5.0/NOPB in its HSOP-8 PowerPAD package?
The LM22673MRE-5.0/NOPB in HSOP-8 PowerPAD (MRE) package has a junction-to-ambient thermal resistance (θJA) of 22°C/W when mounted on a 2-layer PCB with 1-in² 2-oz copper thermal pad connected to the exposed pad. This value assumes standard JEDEC 51-7 test conditions and is critical for calculating maximum continuous output current at elevated ambient temperatures.
LM22673MRE-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
LM22673MRE-5.0/NOPB FAQ
1.How can I place an order for LM22673MRE-5.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22673MRE-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 LM22673MRE-5.0/NOPB reliable?
The price and inventory of LM22673MRE-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 LM22673MRE-5.0/NOPB is usually 5 days.
3.What payment methods are accepted for LM22673MRE-5.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22673MRE-5.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22673MRE-5.0/NOPB?
LM22673MRE-5.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22673MRE-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 LM22673MRE-5.0/NOPB?
For technical support, including LM22673MRE-5.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22673MRE-5.0/NOPB requirements.
6.How does Aetrix verify that LM22673MRE-5.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22673MRE-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 LM22673MRE-5.0/NOPB meets industry standards.
7.What is the process for return or replacement of LM22673MRE-5.0/NOPB?
All LM22673MRE-5.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22673MRE-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 LM22673MRE-5.0/NOPB part is unused and in its original packaging.
Return procedure for LM22673MRE-5.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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