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Texas Instruments LM22672MRE-ADJ/NOPB
- Part No.:
- LM22672MRE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22672MRE-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:758
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Product details
Overview
LM22672MRE-ADJ/NOPB from Texas Instruments is a 42-V, 1-A synchronous step-down DC/DC regulator in an HSOP-8 PowerPAD package, featuring internally compensated voltage-mode control, 500 kHz default switching frequency, ±1.5% feedback reference accuracy (1.285 V), and integrated bootstrap diode. It delivers stable 1.285 V to >5 V adjustable output for industrial power rails.
For engineers reviewing the LM22672MRE-ADJ/NOPB datasheet, LM22672MRE-ADJ/NOPB pinout, LM22672MRE-ADJ/NOPB application, or LM22672MRE-ADJ/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), thermal performance with exposed pad, soft-start adjustability via SS pin, and RT/SYNC frequency tuning from 200 kHz to 1 MHz.
Technical Context
The LM22672MRE-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 is optimized for outputs ≤5 V, enabling stable operation with low-ESR ceramic capacitors without external compensation components.
It integrates a 200 mΩ N-channel MOSFET switch, precision enable input with 1.6 V threshold and 0.6 V hysteresis, and a dedicated BOOT pin driving the high-side gate via external bootstrap capacitor. Thermal shutdown activates at 150°C, and current limiting protects against overloads with foldback mode below ~1.2 V output under short-circuit 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, and 48 V industrial bus rails without pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, FPGAs, and analog subsystems in embedded systems. |
| Feedback Reference | 1.285 V ±1.5% - sets minimum adjustable output; enables precise low-voltage rail generation (e.g., 1.8 V, 3.3 V) using external resistor divider. |
| Switching Frequency | 500 kHz default, adjustable 200 kHz–1 MHz via RT/SYNC resistor - balances efficiency, EMI, and component size; synchronization supported. |
| MOSFET RDS(on) | 200 mΩ (typ) - reduces conduction loss and improves full-load efficiency (>90% typical at 12 VIN/3.3 VOUT). |
| Junction Temp Range | –40°C to +125°C - qualified for industrial and automotive environments; requires thermal pad connection to PCB ground plane. |
| Quiescent Current | 25 µA (typ) in shutdown - enables ultra-low-power system standby modes without external disconnect switches. |
Pinout & Package
LM22672MRE-ADJ/NOPB uses the HSOP-8 PowerPAD (MR) package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground for enhanced thermal dissipation (RθJA = 60°C/W with 1 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply input | Provides gate drive voltage for internal high-side MOSFET; requires 10 nF ceramic capacitor between BOOT and SW. |
| EN | Enable control input | Logic-level enable with 1.6 V threshold and 0.6 V hysteresis; pulls up internally at 6 µA; supports external UVLO sequencing. |
| SW | Switch node output | Drives external inductor; swings from GND to VIN; requires low-inductance layout and snubber if needed. |
| FB | Feedback sensing input | Monitors output via resistor divider; internal 1.285 V reference sets output voltage: VOUT = 1.285 × (1 + R1/R2). |
| GND | Power and signal ground | Common return for power path and control circuitry; must be connected to exposed thermal pad for thermal and electrical integrity. |
| RT/SYNC | Oscillator mode control | Selects operating mode: floating = 500 kHz internal clock; resistor-to-GND = frequency adjustment; external clock = synchronization. |
| SS | Soft-start timing input | Controls startup ramp time via external capacitor; default internal soft-start is ~500 µs; external cap extends ramp linearly. |
| VIN | Main power input | Accepts 4.5–42 V; supplies internal LDO, gate driver, and control circuitry; requires local 10 µF ceramic input capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control | Eliminates need for external compensation network - simplifies design and reduces BOM count for 1-A buck applications. |
| Stable with ceramic output caps | Supports low-ESR ceramic capacitors down to 22 µF - enables compact, high-reliability output filtering without tantalum or electrolytic parts. |
| Integrated bootstrap diode | Removes need for external bootstrap diode - reduces component count and PCB area while maintaining robust high-side gate drive. |
| Adjustable soft-start | External capacitor on SS pin sets controlled output ramp - prevents inrush current and avoids input voltage droop during power-up. |
| Precision enable with UVLO | EN pin provides accurate 1.6 V turn-on threshold and 0.6 V hysteresis - enables reliable multi-rail sequencing and battery discharge protection. |
Applications
| Industrial Control | Telecom/Datacom Systems |
|---|---|
Use Scenario: Powering PLC I/O modules, sensor interfaces, and fieldbus transceivers in factory automation cabinets. IC Role / Device Role / Timing Role: Primary 3.3 V or 5 V point-of-load regulator converting 24 V DC bus to logic-supply rails. Use Value: Wide 4.5–42 V input range accommodates brownout and surge conditions common in industrial 24 V systems. | Use Scenario: Generating intermediate rails (e.g., 3.3 V, 1.8 V) for Ethernet PHYs, SFP+ modules, and baseband processors. IC Role / Device Role / Timing Role: Secondary buck regulator downstream of 48 V telecom rectifier, delivering clean, low-noise power. Use Value: 500 kHz switching frequency enables small 2.2 µH inductors and 22 µF ceramic output caps - reducing board space and cost. |
| Embedded Systems | Conversions from Standard Input Rails |
Use Scenario: Supplying core voltage to ARM Cortex-M7 microcontrollers and FPGA configuration circuits in edge devices. IC Role / Device Role / Timing Role: Adjustable-output buck converter providing 1.2 V to 3.3 V rails with tight load regulation and fast transient response. Use Value: ±1.5% feedback reference accuracy ensures stable MCU core voltage across temperature and line variations. | Use Scenario: Deriving 5 V, 3.3 V, or 1.8 V from legacy 12 V or 24 V wall adapters or vehicle batteries. IC Role / Device Role / Timing Role: Single-chip buck solution replacing linear regulators or discrete switchers in cost-sensitive consumer and automotive accessories. Use Value: 200 mΩ RDS(on) and >90% efficiency minimize heat rise in enclosed enclosures without heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670MRE-ADJ/NOPB | Same pinout and features but rated for 45 V max input and 3 A output; higher RDS(on) (110 mΩ) and larger thermal footprint. | Higher current capability suits 3 A loads; less suitable for space-constrained 1 A designs due to larger package and higher quiescent current. | Select LM22670MRE-ADJ/NOPB only when ≥2.5 A output is required; LM22672MRE-ADJ/NOPB offers better efficiency and smaller footprint at 1 A. |
| TPS54202DRCT | 2 A, 6 V to 18 V input, 500 kHz fixed frequency, no RT/SYNC or SS pins; requires external compensation; smaller 3 mm × 2 mm WSON package. | Limited input range excludes 24 V/42 V industrial use; lacks soft-start and sync - unsuitable for multi-rail sequencing or EMI-sensitive systems. | Choose TPS54202DRCT for compact, low-cost 12 V input applications only; LM22672MRE-ADJ/NOPB remains preferred for wide-input, feature-rich designs. |
Compared with LM22670MRE-ADJ/NOPB, LM22672MRE-ADJ/NOPB delivers identical functionality at lower cost and smaller thermal footprint for 1 A loads; versus TPS54202DRCT, it provides broader input range, adjustable frequency, and integrated soft-start - critical for robust industrial deployment.
Availability
LM22672MRE-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom/datacom systems, and embedded systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LM22672MRE-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 designing analog ICs, embedded processors, and power management solutions for industrial, automotive, and communications markets.
The LM22672 product line delivers SIMPLE SWITCHER® step-down regulators targeting cost-sensitive, high-reliability DC/DC conversion where minimal external components and WEBENCH®-enabled design-in are essential.
FAQ
What is the minimum output voltage achievable with LM22672MRE-ADJ/NOPB?
The LM22672MRE-ADJ/NOPB has a fixed internal feedback reference voltage of 1.285 V (±1.5%), which sets the lowest possible output voltage. When configured in adjustable mode with no external divider, the output equals this reference. To generate voltages below 1.285 V, an external reference or post-regulator is required - the LM22672MRE-ADJ/NOPB itself cannot regulate below its internal reference.
Can LM22672MRE-ADJ/NOPB synchronize to an external clock?
Yes, LM22672MRE-ADJ/NOPB supports external clock synchronization via the RT/SYNC pin. When an external square wave (1.75 V threshold, 50% duty cycle) between 500 kHz and 1 MHz is applied, the device locks to the rising edge and operates synchronously. The internal oscillator must be disabled first - this occurs automatically if the RT/SYNC pin voltage is held outside 0.8 V ±100 mV during startup.
How does the soft-start function work on LM22672MRE-ADJ/NOPB?
The LM22672MRE-ADJ/NOPB implements soft-start by controlling the voltage ramp on the FB pin through an internal 50 µA current source into the SS pin. With no external capacitor, soft-start completes in ~500 µs. Adding a capacitor (100 nF–1 µF) between SS and GND linearly extends ramp time per TSS ≈ 26 × CSS (µs). Soft-start resets during EN deactivation or thermal shutdown.
Is the exposed thermal pad on LM22672MRE-ADJ/NOPB required to be connected to ground?
Yes, the exposed thermal pad (EP) on LM22672MRE-ADJ/NOPB must be soldered to a PCB ground plane. It serves both thermal and electrical functions: lowering junction-to-ambient thermal resistance (RθJA = 60°C/W with 1 in² copper) and providing the primary return path for high-current switching loops. Leaving it unconnected degrades thermal performance and may cause instability or premature thermal shutdown.
Does LM22672MRE-ADJ/NOPB require an external bootstrap diode?
No, LM22672MRE-ADJ/NOPB integrates a bootstrap diode internally. The BOOT pin connects directly to the SW node through this diode, eliminating the need for an external component. A 10 nF ceramic capacitor must still be placed between BOOT and SW with short, low-inductance traces to ensure proper gate drive voltage generation for the internal high-side MOSFET.
LM22672MRE-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:
- 1A
- 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
LM22672MRE-ADJ/NOPB FAQ
1.How can I place an order for LM22672MRE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22672MRE-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 LM22672MRE-ADJ/NOPB reliable?
The price and inventory of LM22672MRE-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 LM22672MRE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22672MRE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22672MRE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22672MRE-ADJ/NOPB?
LM22672MRE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22672MRE-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 LM22672MRE-ADJ/NOPB?
For technical support, including LM22672MRE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22672MRE-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22672MRE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22672MRE-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 LM22672MRE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22672MRE-ADJ/NOPB?
All LM22672MRE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22672MRE-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 LM22672MRE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22672MRE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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