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Texas Instruments LM22680QMRX-ADJ/NOPB
- Part No.:
- LM22680QMRX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22680QMRX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:15,329
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Product details
Overview
LM22680QMRX-ADJ/NOPB from Texas Instruments is a 42 V, 2 A synchronous step-down DC/DC regulator in an HSOP-8 PowerPAD package, featuring adjustable output voltage (as low as 1.285 V), 500 kHz default switching frequency, ±1.5% feedback reference accuracy, and integrated 200-mΩ N-channel MOSFET. It delivers >90% efficiency in industrial power rails converting 24 V or 12 V inputs to point-of-load voltages.
For engineers reviewing the LM22680QMRX-ADJ/NOPB datasheet, LM22680QMRX-ADJ/NOPB pinout, LM22680QMRX-ADJ/NOPB application, or LM22680QMRX-ADJ/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), thermal performance with exposed pad, soft-start programmability via SS pin, RT/SYNC frequency adjust/synchronization capability, and precision enable threshold (1.6 V typ) for reliable power sequencing.
Technical Context
The LM22680QMRX-ADJ/NOPB implements voltage-mode PWM control with input voltage feedforward to stabilize loop gain across wide VIN variations, enabling optimized transient response without external compensation. Its internal Type III compensator ensures stability with ceramic output capacitors and standard inductor values.
It integrates a bootstrap gate driver with dedicated BOOT/SW pins, supports adjustable soft-start via external capacitor on SS, and provides three RT/SYNC modes: internal 500 kHz oscillator, resistor-programmable 200–1000 kHz, or external synchronization up to 1 MHz - with mode latched at startup based on RT/SYNC pin voltage sampling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to unregulated 24 V, 12 V, or automotive battery rails without pre-regulation. |
| Output Current | 2 A continuous - sufficient for FPGA core, microcontroller I/O, or DSP supply rails in embedded systems. |
| Feedback Reference | 1.285 V ±1.5% - enables precise adjustable output down to 1.285 V using two external resistors; critical for low-voltage logic supplies. |
| Switching Frequency | 500 kHz default, adjustable 200–1000 kHz - balances EMI, component size, and efficiency; higher frequencies reduce inductor/capacitor footprint. |
| RDS(ON) | 0.24 Ω (typ) - minimizes conduction loss at full load, contributing to >90% peak efficiency at 12 V → 3.3 V conversion. |
| Junction Temp Range | –40°C to +125°C - qualified for industrial and automotive under-hood environments without derating. |
| Quiescent Current | 3.4 mA (typ) - enables low-power standby operation; drops to 25 µA in shutdown via EN pin. |
Pinout & Package
Package: HSOP-8 with exposed PowerPAD (4.89 mm × 3.90 mm); thermal pad must be soldered to PCB ground plane for RθJA = 60°C/W performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply input | Connects to SW via 10 nF ceramic capacitor to generate gate drive voltage for internal high-side MOSFET. |
| EN | Enable control input | Logic-level enable with 1.6 V threshold and 0.6 V hysteresis; supports precise power sequencing and external UVLO implementation. |
| SW | Switch node output | Drives external inductor; swings from ~0 V to VIN; requires low-inductance layout to minimize EMI and ringing. |
| RT/SYNC | Oscillator mode control | Selects internal 500 kHz, resistor-programmed frequency (200–1000 kHz), or external sync clock up to 1 MHz. |
| FB | Feedback input | Compares divided output voltage against 1.285 V reference; sets regulated output via external resistor divider. |
| GND | System ground | Power and signal return; connects to exposed PowerPAD for thermal and electrical integrity. |
| VIN | Main input supply | Accepts 4.5–42 V; powers internal circuitry and high-side switch; requires local 10 µF ceramic input capacitor. |
| SS | Soft-start timing | Controls ramp-up time via external capacitor; default internal soft-start is ~500 µs; prevents inrush current and overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network - reduces BOM count and design iteration time for stable 2 A buck designs. |
| Stable with low-ESR ceramic capacitors | Enables use of compact, high-reliability X7R/X5R MLCCs instead of bulkier electrolytics - improves long-term stability and temperature performance. |
| Integrated bootstrap diode | Removes requirement for external bootstrap diode - simplifies layout, reduces component count, and avoids reverse recovery losses. |
| Precision enable with UVLO support | Allows robust power sequencing and system-level undervoltage protection using resistor dividers - critical for multi-rail industrial controllers. |
| WEBENCH®-enabled design flow | Provides automated component selection, thermal simulation, and electrical validation - accelerates prototyping from schematic to working board. |
Applications
| Industrial PLC I/O Module | Telecom Line Card Power |
|---|---|
Use Scenario: Providing isolated 3.3 V and 5 V rails for digital I/O, analog front-end, and communication interfaces in programmable logic controller modules operating from 24 V DC bus. IC Role / Device Role / Timing Role: Primary buck regulator delivering clean, regulated 3.3 V at up to 2 A to FPGA configuration logic and microcontroller peripherals. Use Value: Wide 4.5–42 V input range accommodates brownout and surge conditions on factory floor 24 V lines; –40°C to +125°C rating ensures reliability in uncooled enclosures. | Use Scenario: Generating 1.8 V and 3.3 V point-of-load supplies for ASICs, SerDes, and PHYs on telecom line cards powered by –48 V or 24 V intermediate buses. IC Role / Device Role / Timing Role: Secondary buck converter stepping down 12 V intermediate rail to 3.3 V for Ethernet MAC/PHY subsystems. Use Value: 500 kHz switching enables small 2.2 µH inductors and 22 µF ceramic output caps; RT/SYNC pin allows synchronization to system clock to suppress beat frequencies. |
| Automotive Body Control Module | Embedded Vision System Power |
Use Scenario: Supplying 5 V and adjustable 1.2 V rails for microcontrollers, CAN transceivers, and sensor interfaces in body electronics modules connected to 12 V battery with load dump transients. IC Role / Device Role / Timing Role: Main 5 V regulator powering MCU and peripheral ICs; leverages 42 V absolute max rating to survive ISO 7637-2 pulse 5a. Use Value: Automotive-grade LM22680-Q1 variant exists; this part shares identical pinout and electrical specs - enables dual-sourcing and qualification reuse. | Use Scenario: Delivering tightly regulated 1.2 V core voltage to image signal processors (ISPs) and AI accelerators in smart cameras, where dynamic load steps demand fast transient response. IC Role / Device Role / Timing Role: High-efficiency buck regulator with adjustable soft-start and precision FB reference ensuring <±1% output accuracy under varying thermal loads. Use Value: ±1.5% feedback reference and internal Type III compensation ensure stable regulation during rapid ISP core frequency scaling; SS pin enables controlled power-up sequence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22675QMRX-ADJ/NOPB | Lower 40 V max input, 1.5 A output, same HSOP-8 package and pinout. | Suitable for lower-power industrial sensors or legacy 12 V-only systems where 2 A is not required. | Choose when input voltage never exceeds 40 V and load current stays ≤1.5 A - offers cost reduction without layout change. |
| TPS54240DGQR | 40 V max input, 2 A, but uses current-mode control and different pinout (MSOP-10); no integrated boot diode. | Better light-load efficiency due to Eco-mode; requires external bootstrap diode and compensation components. | Prefer for ultra-low quiescent current (<100 µA) or when current-mode control is mandated for multi-phase sync; expect PCB redesign. |
Compared with LM22675QMRX-ADJ/NOPB and TPS54240DGQR, the LM22680QMRX-ADJ/NOPB uniquely combines 42 V input tolerance, 2 A capability, internal compensation, and integrated bootstrap diode in HSOP-8 - making it optimal for ruggedized 24 V industrial and automotive-derived power supplies where layout simplicity and transient robustness are prioritized.
Availability
LM22680QMRX-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom power conversion, and embedded vision systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM22680QMRX-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 decades of expertise in high-reliability DC/DC conversion.
The LM22680 belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use in industrial, automotive, and telecom power applications, emphasizing minimal external components, WEBENCH® integration, and robust operation across harsh voltage and thermal conditions.
FAQ
What is the minimum recommended output voltage for LM22680QMRX-ADJ/NOPB?
The LM22680QMRX-ADJ/NOPB supports an adjustable output voltage as low as 1.285 V, set by the feedback resistor divider connected to the FB pin. This minimum is defined by the internal 1.285 V reference voltage; outputs below this value cannot be regulated. For example, a 1.285 V output requires only a single resistor from FB to GND, while higher voltages require a two-resistor divider. The ±1.5% reference accuracy directly impacts output voltage tolerance across temperature and line conditions.
Does LM22680QMRX-ADJ/NOPB require an external bootstrap diode?
No, the LM22680QMRX-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component between BOOT and SW pins. This simplifies layout, reduces bill-of-materials count, and avoids reverse recovery losses associated with discrete diodes. 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.
How does the RT/SYNC pin configure switching frequency on LM22680QMRX-ADJ/NOPB?
The RT/SYNC pin on LM22680QMRX-ADJ/NOPB determines oscillator mode at startup: floating selects the internal 500 kHz oscillator; a resistor from RT/SYNC to GND (25–200 kΩ) adjusts frequency from 200 kHz to 1 MHz; and an external clock signal (≥500 kHz, ≤1 MHz) applied to RT/SYNC enables synchronization. The mode is latched after ~100 µs and remains until EN or VIN is cycled. Synchronization disables current limit foldback, so this trade-off must be considered in short-circuit-prone applications.
What thermal performance can be expected from LM22680QMRX-ADJ/NOPB in HSOP-8 PowerPAD package?
With its exposed PowerPAD thermally connected to ≥1 square inch of PCB copper, the LM22680QMRX-ADJ/NOPB achieves a junction-to-ambient thermal resistance (RθJA) of 60°C/W. At 2 A load and 12 V input, typical power dissipation is ~0.5 W, resulting in ~30°C junction-to-ambient rise above ambient - well within the –40°C to +125°C operating range. Performance degrades if copper area is reduced; RθJA may reach 115°C/W with minimal copper, requiring derating above 1 A in enclosed environments.
Is LM22680QMRX-ADJ/NOPB pin-compatible with the automotive-grade LM22680Q1 variant?
Yes, LM22680QMRX-ADJ/NOPB is pin-compatible and functionally identical to the LM22680-Q1, differing only in qualification level: the Q1 variant is AEC-Q100 Grade 1 qualified (–40°C to +125°C) for automotive use, while LM22680QMRX-ADJ/NOPB is rated for industrial temperature range (also –40°C to +125°C per datasheet). Both share identical HSOP-8 package, pinout, electrical specifications, and thermal characteristics - enabling drop-in replacement in non-automotive applications and facilitating qualification path migration.
LM22680QMRX-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:
- 2A
- 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
LM22680QMRX-ADJ/NOPB FAQ
1.How can I place an order for LM22680QMRX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22680QMRX-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 LM22680QMRX-ADJ/NOPB reliable?
The price and inventory of LM22680QMRX-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 LM22680QMRX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22680QMRX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22680QMRX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22680QMRX-ADJ/NOPB?
LM22680QMRX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22680QMRX-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 LM22680QMRX-ADJ/NOPB?
For technical support, including LM22680QMRX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22680QMRX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22680QMRX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22680QMRX-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 LM22680QMRX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22680QMRX-ADJ/NOPB?
All LM22680QMRX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22680QMRX-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 LM22680QMRX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22680QMRX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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