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Texas Instruments LM22673QMRE-ADJ/NOPB
- Part No.:
- LM22673QMRE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22673QMRE-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:596
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Product details
Overview
LM22673QMRE-ADJ/NOPB from Texas Instruments is a 42 V, 3 A synchronous step-down DC/DC regulator in HSOP-8 PowerPAD package, featuring adjustable output (down to 1.285 V), 500 kHz fixed-frequency voltage-mode control, and integrated 120 mΩ N-channel MOSFET switch. It delivers >90% efficiency in industrial power rails converting 12 V or 24 V inputs to 3.3 V or 5 V system supplies.
For engineers reviewing the LM22673QMRE-ADJ/NOPB datasheet, LM22673QMRE-ADJ/NOPB pinout, LM22673QMRE-ADJ/NOPB application, or LM22673QMRE-ADJ/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), adjustable current limit via IADJ pin, internal compensation for ≤5 V outputs, thermal shutdown at 150°C, and compatibility with low-ESR ceramic output capacitors.
Technical Context
The LM22673QMRE-ADJ/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 output voltages ≤5 V, enabling stable operation without external compensation components when paired with standard buck power stages.
It integrates a bootstrap gate driver for the high-side N-MOSFET, requiring a 10 nF ceramic capacitor between BOOT and SW pins. Minimum on-time (100 ns) and off-time (200 ns) constraints define practical VIN/VOUT conversion ratios and enforce minimum load (~5 mA) for boot-cap recharge integrity.
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 48 V industrial rails without pre-regulation. |
| Output Voltage | Adjustable down to 1.285 V - set via external resistor divider on FB pin; reference accuracy ±1.5% over –40°C to 125°C. |
| Switching Frequency | 500 kHz - enables compact magnetics and ceramic output capacitors; tolerance ±20% over temperature. |
| Max Output Current | 3 A - limited by internal 120 mΩ N-MOSFET RDS(ON); derated above 85°C ambient per thermal metrics. |
| Current Limit | Programmable via IADJ pin - default 4.2 A (typ); adjustable down using external resistor; accuracy +35%/–25%. |
| Junction Temp Range | –40°C to 125°C - qualified for extended industrial and automotive-grade environments (Q1 variant available). |
| Efficiency | >90% - measured at 12 V IN → 3.3 V/3 A; peak efficiency occurs near mid-load with low-RDS(ON) switch and ceramic caps. |
Pinout & Package
LM22673QMRE-ADJ/NOPB uses an HSOP-8 PowerPAD package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground plane for enhanced thermal dissipation (RθJA = 60°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 EMI and switching losses. |
| 2 VIN | Power Input | Primary supply input (4.5–42 V); bypassed with ≥10 µF ceramic capacitor close to pin. |
| 3 BOOT | Bootstrap Supply | Connects to SW via 10 nF ceramic capacitor; provides gate drive voltage for internal high-side MOSFET. |
| 4 GND | System Ground | Analog and power ground reference; tied directly to exposed pad for thermal and noise performance. |
| 5 IADJ | Current Limit Adjust | Sets peak switch current threshold; floating = 4.2 A default; resistor-to-GND scales limit downward. |
| 6 FB | Feedback Input | High-impedance (230 nA bias) node sensing output voltage via resistor divider; determines regulated VOUT. |
| 7 SS | Soft-Start Control | Controls output ramp rate; internal ~500 µs start-up; external capacitor extends time linearly (100 nF–1 µF typical). |
| 8 EP | Exposed Pad | Thermal and electrical connection to GND; mandatory for thermal reliability and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Internally Compensated Loop | Eliminates need for external compensation network when regulating ≤5 V outputs; reduces BOM count and layout sensitivity. |
| Adjustable Current Limit | Single resistor on IADJ pin allows precise tailoring of overcurrent protection to match application load profile and inductor rating. |
| Integrated Bootstrap Diode | Removes need for external bootstrap diode; simplifies layout and improves reliability in high-duty-cycle applications. |
| UVLO with Hysteresis | Turns on at 4.3 V (typ), turns off at 3.9 V (typ); prevents erratic startup during brown-out conditions on 5 V or 12 V rails. |
| Thermal Shutdown | Shuts down at 150°C junction temp; auto-restarts at ~135°C; protects device during sustained overload or poor heatsinking. |
Applications
| Industrial PLC Power Supply | Automotive Body Control Module |
|---|---|
Use Scenario: Regulating 24 V vehicle battery or factory 24 V rail to 3.3 V for microcontroller, CAN transceiver, and sensor interfaces. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering clean, regulated 3.3 V at up to 3 A with fast transient response. Use Value: Enables single-stage conversion from harsh 24 V input with built-in UVLO, thermal protection, and wide-temp operation (–40°C to 125°C). | Use Scenario: Powering infotainment SoC core and I/O rails in automotive head units where space and thermal density are constrained. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator replacing discrete buck controllers and external MOSFETs. Use Value: Reduces solution size via integrated 120 mΩ switch and eliminates external bootstrap diode-critical for compact automotive modules. |
| Telecom Remote Radio Unit | Factory Automation Sensor Hub |
Use Scenario: Converting 48 V PoE-derived or telecom -48 V (with polarity inversion) input to 5 V for FPGA and ADC subsystems. IC Role / Device Role / Timing Role: Robust front-end buck stage handling wide input transients and ESD events in outdoor base station enclosures. Use Value: 42 V absolute max rating and ±1.5% reference accuracy ensure stable 5 V output despite line surges and temperature drift. | Use Scenario: Providing isolated 3.3 V and 5 V rails for multi-sensor nodes (temperature, pressure, vibration) in IIoT edge gateways. IC Role / Device Role / Timing Role: Adjustable-output buck regulator supporting multiple sensor voltage requirements via simple resistor changes. Use Value: FB pin flexibility and soft-start programmability allow safe powering of mixed-voltage sensor arrays without inrush current damage. |
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-ADJ/NOPB | Same architecture but SO PowerPAD (TO-263-7) package; higher RθJA (22°C/W); 100 mΩ RDS(ON). | Better thermal performance in high-power continuous operation; larger footprint; requires different PCB land pattern. | Select when thermal margin is critical and board space permits TO-263 package. |
| TPS54340DDAR | 42 V, 3.5 A buck; 100 kHz–2.5 MHz adjustable frequency; external compensation; no IADJ pin. | Greater design flexibility for noise-sensitive or EMI-constrained systems; lacks programmable current limit and internal compensation. | Select when frequency tuning or custom loop shaping is required, and current limit adjustment is not needed. |
Compared with LM22674MRE-ADJ/NOPB, the LM22673QMRE-ADJ/NOPB offers smaller footprint and lower cost for space-constrained designs, while TPS54340DDAR trades simplicity for configurability-making it suitable for applications needing frequency agility or tighter EMI control, but requiring more design effort.
Availability
LM22673QMRE-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, automotive body electronics, and telecom power conversion requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LM22673QMRE-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 specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-reliability power conversion solutions.
The LM22673 product line delivers SIMPLE SWITCHER® buck regulators targeting cost-sensitive, space-constrained industrial and automotive applications where ease of use, minimal external components, and robust thermal performance are essential.
FAQ
What input voltage range does the LM22673QMRE-ADJ/NOPB support?
The LM22673QMRE-ADJ/NOPB supports an input voltage range of 4.5 V to 42 V. This allows direct regulation from common industrial rails (12 V, 24 V) and telecom sources (48 V with appropriate derating). Absolute maximum VIN is 43 V, and UVLO ensures reliable startup only above 4.3 V (typ), preventing operation during brown-out conditions.
How is the output voltage set on the LM22673QMRE-ADJ/NOPB?
The LM22673QMRE-ADJ/NOPB uses a resistive feedback divider connected to the FB pin to set the output voltage. With a 1.285 V internal reference, VOUT = 1.285 V × (1 + RFBT/RFBB). A typical RFBB value is 1 kΩ; total divider resistance should not exceed 10 kΩ to maintain accuracy. The LM22673QMRE-ADJ/NOPB does not have a fixed-output variant-only the adjustable version is offered in the QMRE package.
Can the current limit of the LM22673QMRE-ADJ/NOPB be adjusted, and how?
Yes, the LM22673QMRE-ADJ/NOPB features an adjustable current limit via the IADJ pin. Leaving IADJ floating sets the default peak switch current to 4.2 A (typ). Connecting a resistor from IADJ to GND scales the limit downward per Figure 12 in the datasheet; accuracy is +35%/–25%. Resistor values must stay within specified bounds to avoid invalid settings or latch-up.
What thermal considerations apply to the LM22673QMRE-ADJ/NOPB in HSOP-8 PowerPAD package?
The LM22673QMRE-ADJ/NOPB in HSOP-8 PowerPAD has a junction-to-ambient thermal resistance (RθJA) of 60°C/W. Effective thermal design requires soldering the exposed pad to a large copper pour tied to system ground. Thermal shutdown activates at 150°C and releases at ~135°C. For continuous 3 A loads above 60°C ambient, additional airflow or thermal vias under the pad are recommended to avoid derating.
Does the LM22673QMRE-ADJ/NOPB require an external bootstrap diode?
No, the LM22673QMRE-ADJ/NOPB integrates a bootstrap diode, eliminating the need for an external component. The BOOT pin connects to SW through a 10 nF ceramic capacitor to generate the gate drive voltage for the internal high-side N-MOSFET. This integration simplifies layout, reduces bill-of-materials count, and improves reliability compared to controllers requiring discrete bootstrap diodes.
LM22673QMRE-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:
- 3A
- 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
LM22673QMRE-ADJ/NOPB FAQ
1.How can I place an order for LM22673QMRE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22673QMRE-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 LM22673QMRE-ADJ/NOPB reliable?
The price and inventory of LM22673QMRE-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 LM22673QMRE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22673QMRE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22673QMRE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22673QMRE-ADJ/NOPB?
LM22673QMRE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22673QMRE-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 LM22673QMRE-ADJ/NOPB?
For technical support, including LM22673QMRE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22673QMRE-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22673QMRE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22673QMRE-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 LM22673QMRE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22673QMRE-ADJ/NOPB?
All LM22673QMRE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22673QMRE-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 LM22673QMRE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22673QMRE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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