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Texas Instruments LM22680MRX-ADJ/NOPB
- Part No.:
- LM22680MRX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22680MRX-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:3,288
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Product details
Overview
LM22680MRX-ADJ/NOPB from Texas Instruments is a 42 V, 2 A synchronous step-down DC/DC regulator with 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 operates across –40°C to +125°C and is used in industrial power rails converting 24 V or 12 V inputs to stable low-voltage logic supplies.
For engineers reviewing the LM22680MRX-ADJ/NOPB datasheet, LM22680MRX-ADJ/NOPB pinout, LM22680MRX-ADJ/NOPB application, or LM22680MRX-ADJ/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), thermal performance in HSOP PowerPAD™ package, soft-start programmability via SS pin, and synchronization capability via RT/SYNC pin.
Technical Context
The LM22680MRX-ADJ/NOPB implements voltage-mode PWM control with input voltage feedforward for stable loop gain across wide VIN variations. Its internal Type III compensation eliminates external compensation components and supports ceramic output capacitors with low ESR.
It integrates a bootstrap gate driver with dedicated BOOT pin, precision enable with 1.6 V threshold and 0.6 V hysteresis, and configurable oscillator modes: internal 500 kHz, resistor-adjustable (200–1000 kHz), or external synchronization (up to 1 MHz). Current limit foldback is active except when synchronized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to unregulated 24 V industrial or automotive battery rails without pre-regulation. |
| Output Current | Up to 2 A - sufficient for powering microcontrollers, FPGAs, and analog signal chains in embedded systems. |
| Feedback Reference | 1.285 V ±1.5% - enables precise adjustable output down to 1.285 V using external resistor divider; critical for low-voltage core supplies. |
| Switching Frequency | 500 kHz (default), adjustable 200–1000 kHz - balances efficiency, component size, and EMI; higher frequencies reduce inductor/capacitor footprint. |
| MOSFET RDS(on) | 0.24 Ω (typ) at 25°C - minimizes conduction loss and thermal rise under full 2 A load; improves efficiency >90% at mid-load. |
| Quiescent Current | 3.4 mA (typ) - enables low-power operation in always-on subsystems; standby current drops to 25 µA in shutdown. |
| Junction Temp Range | –40°C to +125°C - qualified for harsh environments including industrial controls and telecom base stations. |
Pinout & Package
LM22680MRX-ADJ/NOPB uses an 8-pin HSOP package with exposed PowerPAD™ thermal pad (4.89 mm × 3.90 mm); the exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| 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 on/off control with 1.6 V threshold and 0.6 V hysteresis; supports precise power sequencing and external UVLO. |
| SW | Switch node output | Drives external inductor; swings from ~0 V to VIN; requires low-inductance layout to minimize ringing and EMI. |
| FB | Feedback input | Connects to resistor divider from VOUT; regulates output by comparing against 1.285 V internal reference. |
| GND | System ground | Power and signal return; ties to exposed pad for optimal thermal dissipation and noise immunity. |
| RT/SYNC | Oscillator mode control | Selects internal 500 kHz, resistor-adjusted (200–1000 kHz), or external synchronization (≤1 MHz). |
| SS | Soft-start timing | Controls startup ramp time via external capacitor; extends rise time to limit inrush current and stress on input capacitors. |
| VIN | Main input supply | Accepts 4.5–42 V; powers internal LDO, gate driver, and control circuitry; bypass with ≥10 µF ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network; simplifies design and ensures stability with standard ceramic output capacitors. |
| Integrated bootstrap diode | Removes requirement for external bootstrap diode; reduces BOM count and layout complexity while maintaining reliable high-side gate drive. |
| Adjustable soft-start | Startup time programmable from ~500 µs (internal) to milliseconds via external SS capacitor; prevents output overshoot and input rail sag. |
| Precision enable with UVLO | Enables clean power sequencing and system-level undervoltage protection; EN pin can replace discrete UVLO circuits in multi-rail systems. |
| WEBENCH®-enabled | Full online design support including component selection, efficiency simulation, thermal modeling, and PCB layout guidance directly from TI's toolchain. |
Applications
| Industrial Control | Telecom/Datacom Systems |
|---|---|
Use Scenario: Powering PLC I/O modules and sensor interfaces from 24 V DC bus in factory automation cabinets. IC Role / Device Role / Timing Role: Primary buck converter delivering regulated 3.3 V or 5 V to microcontroller, ADCs, and digital isolators. Use Value: Wide 4.5–42 V input range accommodates brownout and surge conditions on industrial 24 V rails; 125°C rating ensures reliability in enclosed enclosures. | Use Scenario: Generating intermediate 5 V or 12 V rails in telecom line cards powered from –48 V backplane via intermediate boost stage. IC Role / Device Role / Timing Role: Secondary step-down regulator supplying FPGA core, SerDes, and management MCU after front-end isolation. Use Value: 500 kHz switching enables compact magnetics; synchronization capability avoids beat frequencies with other system clocks. |
| Embedded Systems | Conversions from Standard Input Rails |
Use Scenario: Powering ARM-based edge AI gateways requiring multiple low-noise, tightly regulated supplies (e.g., 1.8 V, 3.3 V). IC Role / Device Role / Timing Role: Adjustable-output buck regulator configured for 1.285 V minimum output, supporting DDR memory termination and low-voltage cores. Use Value: ±1.5% feedback accuracy ensures compliance with tight core voltage tolerances; soft-start prevents reset glitches during cold boot. | Use Scenario: Replacing linear regulators on legacy 12 V or 24 V boards to improve efficiency and reduce thermal load in space-constrained designs. IC Role / Device Role / Timing Role: High-efficiency drop-in replacement for obsolete 78xx-style regulators, delivering up to 2 A with >90% efficiency. Use Value: Integrated MOSFET and compensation eliminate 4–6 external components; SO PowerPAD™ package delivers 60°C/W junction-to-ambient thermal resistance with proper copper area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670MRX-ADJ/NOPB | Lower 3 V min input, 3 A output, same 42 V max input; no integrated bootstrap diode; requires external bootstrap diode. | Better suited for lower-input-voltage systems (e.g., 5 V input rails); less suitable where board space is constrained due to extra diode. | Select LM22670MRX-ADJ/NOPB only if input voltage may dip below 4.5 V and higher output current is required. |
| TPS54260DGQR | Wider 3.5–60 V input, 2.5 A output, adjustable frequency (100–2500 kHz), no integrated bootstrap diode, different pinout. | Supports higher input voltages (e.g., 48 V telecom); requires external bootstrap diode and compensation; not pin-compatible. | Choose TPS54260DGQR when input exceeds 42 V or when ultra-wide frequency tuning (up to 2.5 MHz) is needed for EMI shaping. |
Compared with LM22680MRX-ADJ/NOPB, LM22670MRX-ADJ/NOPB offers higher current but adds BOM and layout complexity, while TPS54260DGQR extends input range and frequency flexibility at the cost of integration and pin compatibility.
Availability
LM22680MRX-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 consistent parametric performance across temperature and input voltage ranges.
Supply support for LM22680MRX-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 LM22680MRX-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family-designed for ease-of-use in non-isolated DC/DC buck applications where minimal external components, fast design cycle, and robust operation across harsh environments are essential.
FAQ
What is the minimum output voltage achievable with LM22680MRX-ADJ/NOPB?
The LM22680MRX-ADJ/NOPB supports an adjustable output voltage down to 1.285 V, set by the internal feedback reference voltage. This value is specified with ±1.5% accuracy over temperature and line conditions. To achieve this minimum, the FB pin must be connected to the output through a resistor divider that scales VOUT to exactly 1.285 V at the FB node. Lower outputs are not supported by the internal reference architecture of the LM22680MRX-ADJ/NOPB.
Does LM22680MRX-ADJ/NOPB require an external bootstrap diode?
No, the LM22680MRX-ADJ/NOPB integrates a bootstrap diode internally, eliminating the need for an external component. The BOOT pin connects directly to a 10 nF ceramic capacitor between BOOT and SW, and the internal diode automatically charges the bootstrap capacitor during the low-side conduction phase. This integration reduces bill-of-materials count, PCB area, and potential failure points compared to controllers requiring external bootstrap diodes.
Can LM22680MRX-ADJ/NOPB synchronize to an external clock?
Yes, LM22680MRX-ADJ/NOPB supports external synchronization via the RT/SYNC pin. When driven with a clean square wave between 1.75 V and 3.5 V at a frequency greater than the internal 500 kHz oscillator (but ≤1 MHz), the device locks to the rising edge of the external clock. Synchronization must be established at startup; if the external clock is lost during operation, LM22680MRX-ADJ/NOPB automatically reverts to its internal 500 kHz oscillator.
What thermal performance can be expected from LM22680MRX-ADJ/NOPB in its HSOP PowerPAD™ package?
The LM22680MRX-ADJ/NOPB in the HSOP (DDA) package has a junction-to-ambient thermal resistance (RθJA) of 60°C/W when mounted on 1 square inch of 2-oz copper. Actual thermal performance depends on PCB layout: increasing copper area and adding thermal vias under the exposed pad lowers RθJA toward 42°C/W. At 2 A load and 12 V input, typical power dissipation is ~0.5 W; with proper layout, junction temperature rise remains within safe limits even at 125°C ambient.
Is LM22680MRX-ADJ/NOPB suitable for automotive applications?
The LM22680MRX-ADJ/NOPB is not automotive-qualified; it is the commercial-grade variant. For automotive use, TI offers the LM22680-Q1, which is AEC-Q100 Grade 1 qualified (–40°C to +125°C) and undergoes additional stress testing. While LM22680MRX-ADJ/NOPB shares identical electrical specifications and pinout, it lacks the automotive qualification documentation, traceability, and lot-level PPAP support required for vehicle applications.
LM22680MRX-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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
LM22680MRX-ADJ/NOPB FAQ
1.How can I place an order for LM22680MRX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22680MRX-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 LM22680MRX-ADJ/NOPB reliable?
The price and inventory of LM22680MRX-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 LM22680MRX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22680MRX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22680MRX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22680MRX-ADJ/NOPB?
LM22680MRX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22680MRX-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 LM22680MRX-ADJ/NOPB?
For technical support, including LM22680MRX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22680MRX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22680MRX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22680MRX-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 LM22680MRX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22680MRX-ADJ/NOPB?
All LM22680MRX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22680MRX-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 LM22680MRX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22680MRX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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