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Texas Instruments LM22672QMRE-ADJ/NOPB
- Part No.:
- LM22672QMRE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22672QMRE-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:695
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Product details
Overview
LM22672QMRE-ADJ/NOPB from Texas Instruments is a 42-V, 1-A adjustable-output synchronous buck DC/DC regulator in an HSOP-8 PowerPAD package. It integrates a 200 mΩ N-channel MOSFET switch, supports input voltages from 4.5 V to 42 V, delivers output as low as 1.285 V via external feedback divider, and operates at a default 500 kHz switching frequency with ±1.5% reference accuracy - used in industrial power rails converting 24 V or 12 V to sub-5 V logic supplies.
For engineers reviewing the LM22672QMRE-ADJ/NOPB datasheet, LM22672QMRE-ADJ/NOPB pinout, LM22672QMRE-ADJ/NOPB application, or LM22672QMRE-ADJ/NOPB equivalent, key selection factors include its internally compensated voltage-mode control, adjustable soft-start via SS pin, RT/SYNC frequency tuning/synchronization capability, integrated bootstrap diode, and AEC-Q100 Grade 1 qualification for automotive-grade thermal robustness (–40°C to +125°C).
Technical Context
The LM22672QMRE-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain across wide VIN ranges. Its internal Type III compensation network is optimized for output voltages ≤5 V, enabling stable operation with low-ESR ceramic capacitors without external compensation components.
It features precision enable with 1.6 V threshold and 0.6 V hysteresis, programmable soft-start via external capacitor on SS pin, and three RT/SYNC modes: internal 500 kHz oscillator, resistor-adjusted 200 kHz–1 MHz, or external synchronization - though frequency adjustment and sync cannot operate simultaneously.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct regulation from unregulated 24 V/12 V industrial or automotive rails without pre-regulation. |
| Output Current | 1 A continuous - sufficient for powering microcontrollers, FPGAs, and analog circuitry in embedded systems. |
| Feedback Reference | 1.285 V (typ), ±1.5% - enables precise adjustable output down to 1.285 V using external resistor divider. |
| Switch RDS(on) | 200 mΩ (typ) - reduces conduction loss and improves efficiency >90% at mid-load conditions. |
| Switching Frequency | 500 kHz (default), adjustable 200 kHz–1 MHz - balances EMI, component size, and transient response. |
| Junction Temp Range | –40°C to +125°C - qualified per AEC-Q100 Grade 1, suitable for under-hood automotive and harsh industrial environments. |
| Quiescent Current | 3.4 mA (typ) - enables low-power standby operation without compromising startup speed. |
| Standby Current | 25 µA (typ) - minimizes battery drain during system sleep or shutdown states. |
Pinout & Package
LM22672QMRE-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 N-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 for simple tie-high operation. |
| SW | Switch node output | Drives external inductor; swings from ~0 V to VIN; must be routed with minimal parasitic inductance. |
| RT/SYNC | Oscillator mode control | Selects internal 500 kHz, resistor-tuned (25 kΩ–200 kΩ), or external sync mode - latched at startup. |
| FB | Feedback input | Connects to resistor divider from VOUT; regulates output by comparing against 1.285 V internal reference. |
| GND | Power and signal ground | Common return for all internal circuits; connects directly to exposed thermal pad for thermal and electrical integrity. |
| VIN | Main power input | Accepts 4.5–42 V; powers internal bias circuitry and high-side driver; requires local 10 µF ceramic input capacitor. |
| SS | Soft-start timing input | Controls ramp-up time via external capacitor; default internal soft-start is ~500 µs; extends linearly with CSS. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network - simplifies design and reduces BOM count for stable 1-A buck conversion. |
| Integrated bootstrap diode | Removes requirement for external bootstrap diode - reduces layout complexity and improves reliability in high-duty-cycle applications. |
| Adjustable soft-start via SS pin | Prevents inrush current and output overshoot by controlling VOUT ramp rate with single external capacitor (100 nF–1 µF). |
| Thermal shutdown & current limiting | Protects against sustained overload or ambient overheating; triggers at 150°C junction temp and limits peak switch current to 1.3 A (typ). |
| WEBENCH®-enabled design support | Enables full simulation, component selection, thermal analysis, and Build-It board generation directly from TI's online tool. |
Applications
| Industrial Control Power | Automotive Body Control Module |
|---|---|
Use Scenario: Regulating 24 V vehicle battery or factory bus to 3.3 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, regulated 3.3 V to microcontroller peripherals and analog front-ends. Use Value: Wide 4.5–42 V input range accommodates cold-crank and load-dump transients; AEC-Q100 Grade 1 rating ensures operation across –40°C to +125°C junction. | Use Scenario: Powering CAN transceivers, door lock actuators, and lighting drivers in body electronics ECUs. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter supplying 5 V or adjustable rail to mixed-signal subsystems. Use Value: 1 A output current supports multiple downstream LDOs; integrated soft-start prevents bus voltage sag during ECU wake-up. |
| Telecom Remote Radio Unit | Embedded System Power Management |
Use Scenario: Converting 48 V PoE-derived or -48 V telecom supply to 1.8 V/2.5 V for FPGA configuration and RF IC biasing. IC Role / Device Role / Timing Role: Intermediate buck stage feeding low-noise LDOs or directly powering digital baseband ICs. Use Value: 500 kHz switching enables compact 2.2 µH inductor and 10 µF ceramic output cap; stable with low-ESR ceramics reduces board area. | Use Scenario: Providing configurable core voltage (1.2 V–3.3 V) to ARM Cortex-M or RISC-V SoCs in portable edge devices. IC Role / Device Role / Timing Role: Adjustable main power supply with precision enable sequencing and thermal monitoring. Use Value: ±1.5% FB reference and 200 mΩ RDS(on) ensure tight output regulation under dynamic load; EN pin enables coordinated power-up with PMIC or host MCU. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670MRE-ADJ/NOPB | Same pinout, identical features, but rated for 4.5–42 V input and 3 A output - higher current capability with larger thermal footprint. | Used where >1 A load current or higher thermal margin is required; not drop-in due to different current limit and thermal design. | Select LM22670MRE-ADJ/NOPB only if load exceeds 1 A or ambient temperature exceeds 85°C with limited heatsinking. |
| TPS54202DRCT | 3–28 V input, 2 A, 500 kHz, integrated high-/low-side FETs; smaller 3 mm × 2 mm WSON package; no exposed thermal pad. | Better suited for space-constrained consumer or computing applications; lacks AEC-Q100 qualification and 42 V input capability. | Choose TPS54202DRCT when board area is critical and input voltage stays below 28 V; avoid in automotive or industrial 42 V environments. |
Compared with LM22672QMRE-ADJ/NOPB, LM22670MRE-ADJ/NOPB offers higher current headroom at the cost of larger thermal mass, while TPS54202DRCT trades input voltage range and automotive qualification for compact packaging and dual-FET integration - making LM22672QMRE-ADJ/NOPB optimal for rugged 1-A industrial and automotive buck conversion where 42 V tolerance and thermal reliability are mandatory.
Availability
LM22672QMRE-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, automotive body electronics, and telecom remote radio unit designs requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant performance.
Supply support for LM22672QMRE-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 technologies, with over 90 years of innovation in high-reliability electronic components.
The LM22672 product line delivers SIMPLE SWITCHER®-class buck regulators designed for ease-of-use in industrial, automotive, and telecom power systems - emphasizing minimal external components, internal compensation, and robust operation across extreme voltage and temperature ranges.
FAQ
What is the minimum output voltage supported by the LM22672QMRE-ADJ/NOPB?
The LM22672QMRE-ADJ/NOPB supports a minimum output voltage of 1.285 V (typ), set by its internal feedback reference voltage. This value is specified with ±1.5% accuracy over temperature (–40°C to +125°C). To achieve this minimum, the FB pin must be connected directly to the output; any external resistor divider will raise the regulated output above 1.285 V proportionally. The LM22672QMRE-ADJ/NOPB datasheet confirms this in Section 6.6 Electrical Characteristics under "Feedback Voltage" for the ADJ version.
Does the LM22672QMRE-ADJ/NOPB require an external bootstrap diode?
No, the LM22672QMRE-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component. This is explicitly stated in the "Features" section of the datasheet and verified in the "Boot-Strap Supply" subsection (7.3.5), which notes that only a 10 nF ceramic capacitor between BOOT and SW is required. Using an external diode with the LM22672QMRE-ADJ/NOPB is unnecessary and may interfere with proper gate drive operation.
Can the LM22672QMRE-ADJ/NOPB synchronize to an external clock while also adjusting frequency with an RT resistor?
No, the LM22672QMRE-ADJ/NOPB cannot use frequency adjustment and external synchronization simultaneously. As documented in Section 7.3.3, the RT/SYNC pin operates in one of three mutually exclusive modes: floating (500 kHz internal oscillator), resistor-connected (200 kHz–1 MHz adjustment), or externally driven (synchronization). The mode is latched at startup based on RT/SYNC voltage level, and attempting both functions concurrently will result in undefined behavior or fallback to internal oscillator mode.
What thermal performance can be expected from the LM22672QMRE-ADJ/NOPB in HSOP-8 PowerPAD package?
The LM22672QMRE-ADJ/NOPB in HSOP-8 PowerPAD (MR) package has a junction-to-ambient thermal resistance (RθJA) of 60°C/W when mounted on 1 in² of PCB copper. This value assumes proper soldering of the exposed thermal pad to a solid GND plane. Actual thermal performance varies from 42°C/W (with aggressive copper pours) to 115°C/W (minimal copper), as noted in Section 6.5. For reliable 1-A operation at +125°C ambient, thermal design must ensure junction temperature remains ≤150°C - typically requiring ≥0.5 in² of dedicated thermal copper.
Is the LM22672QMRE-ADJ/NOPB pin-compatible with the LM22672-5.0 variant?
Yes, the LM22672QMRE-ADJ/NOPB is pin-compatible with the fixed-output LM22672-5.0 variants (e.g., LM22672MRE-5.0/NOPB), sharing identical HSOP-8 PowerPAD package, pinout, and functional pin assignments. The only difference lies in internal feedback configuration: the -ADJ version routes FB to an external divider, while the -5.0 version internally fixes FB to 5 V. No PCB layout change is needed when substituting between these versions, though external resistor networks must be adjusted accordingly.
LM22672QMRE-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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM22672QMRE-ADJ/NOPB FAQ
1.How can I place an order for LM22672QMRE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22672QMRE-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 LM22672QMRE-ADJ/NOPB reliable?
The price and inventory of LM22672QMRE-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 LM22672QMRE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22672QMRE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22672QMRE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22672QMRE-ADJ/NOPB?
LM22672QMRE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22672QMRE-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 LM22672QMRE-ADJ/NOPB?
For technical support, including LM22672QMRE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22672QMRE-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22672QMRE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22672QMRE-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 LM22672QMRE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22672QMRE-ADJ/NOPB?
All LM22672QMRE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22672QMRE-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 LM22672QMRE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22672QMRE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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