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Texas Instruments LM22680MRE-ADJ/NOPB
- Part No.:
- LM22680MRE-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22680MRE-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,182
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Product details
Overview
LM22680MRE-ADJ/NOPB from Texas Instruments is a 42 V, 2 A synchronous step-down DC/DC regulator in an HSOP-8 PowerPAD package, featuring voltage-mode control, internal compensation, and adjustable output down to 1.285 V. It integrates a 200-mΩ N-channel MOSFET switch, supports 4.5–42 V input, delivers >90% efficiency, and operates across –40°C to +125°C for industrial power conversion in 24-V/12-V rail systems.
For engineers reviewing the LM22680MRE-ADJ/NOPB datasheet, LM22680MRE-ADJ/NOPB pinout, LM22680MRE-ADJ/NOPB application, or LM22680MRE-ADJ/NOPB equivalent, key selection considerations include its 500-kHz default switching frequency, ±1.5% feedback reference accuracy, precision enable threshold (1.6 V typ), adjustable soft-start via external capacitor, and thermal shutdown with current limiting.
Technical Context
The LM22680MRE-ADJ/NOPB implements a voltage-mode PWM controller with input voltage feedforward to stabilize loop gain against VIN variations, enabling optimized transient response. Its internal Type III compensation eliminates external compensation components and ensures stability with low-ESR ceramic output capacitors.
It uses a bootstrap gate driver for the high-side N-channel MOSFET, requiring a 10-nF ceramic capacitor between BOOT and SW pins. The device supports three oscillator modes-internal 500-kHz default, resistor-adjustable (200 kHz–1 MHz), or external synchronization-latched at startup based on RT/SYNC pin voltage relative to 0.8 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide industrial input rails including 24 V, 12 V, and 5 V sources without pre-regulation. |
| Output Current | Up to 2 A - sufficient for powering microcontrollers, FPGAs, and analog circuitry in embedded systems. |
| Feedback Reference | 1.285 V ±1.5% - enables precise adjustable output down to 1.285 V using external resistor divider. |
| Switching Frequency | 500 kHz (default), adjustable 200 kHz–1 MHz - balances EMI, component size, and efficiency; synchronization supported. |
| RDS(ON) | 0.24 Ω (typ) - reduces conduction loss and improves thermal performance at full load. |
| Quiescent Current | 3.4 mA (typ) - enables efficient operation under light loads without compromising regulation. |
| Standby Current | 25 µA (typ) - minimizes system power draw during shutdown or sequencing. |
| Junction Temp Range | –40°C to +125°C - qualified for harsh industrial and automotive-grade environments (Q1 variant available). |
Pinout & Package
LM22680MRE-ADJ/NOPB is housed in an HSOP-8 package with exposed PowerPAD (MR suffix), measuring 4.89 mm × 3.90 mm. The exposed pad must be soldered to a PCB ground plane for optimal thermal performance and electrical stability.
| 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 to SW. |
| EN | Enable control input | Logic-level enable with 1.6 V typical 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; connects to BOOT capacitor and external diode/FET. |
| RT/SYNC | Oscillator mode control | Determines operating mode: floating = 500 kHz, resistor-to-GND = adjustable frequency, external clock = sync mode. |
| FB | Feedback input | Senses output voltage via resistor divider; regulates output to 1.285 V reference with ±1.5% accuracy. |
| GND | System ground | Power and signal return; connects to exposed PowerPAD for thermal and EMI performance. |
| VIN | Main input supply | Accepts 4.5–42 V; powers internal circuitry and high-side switch; requires local ceramic bypass. |
| SS | Soft-start timing | Controls ramp-up time via external capacitor; extends start-up duration to limit inrush current. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network; simplifies design and improves robustness across load/line transients. |
| Stable with low-ESR ceramic capacitors | Enables use of compact, high-reliability MLCCs instead of bulkier electrolytics-reducing board area and improving lifetime. |
| Integrated bootstrap diode | Removes need for external bootstrap diode; reduces BOM count and layout complexity while maintaining gate drive integrity. |
| Adjustable soft-start | Prevents input inrush and output overshoot via user-selectable capacitor (100 nF–1 µF); supports controlled power-up sequencing. |
| Precision enable with UVLO | Allows accurate multi-rail sequencing and battery-discharge protection via resistor-divider control; internal 6 µA pullup simplifies interface. |
| Thermal shutdown & current limiting | Protects against sustained overloads and PCB overheating; includes foldback mode for short-circuit survival (disabled during sync mode). |
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 buck regulator converting 24-V DC bus to 3.3-V or 5-V logic supply with tight line/load regulation. Use Value: Delivers stable 2-A output across wide temperature range and input ripple, ensuring reliable operation in electrically noisy environments. | Use Scenario: Generating intermediate rails (e.g., 1.8 V, 3.3 V) from 48-V telecom rectifier outputs in base station power shelves. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with adjustable frequency to avoid interference with data clock domains. Use Value: 500-kHz default switching enables small magnetics; synchronization capability allows coordinated switching across multiple rails to reduce input ripple. |
| Embedded Systems | Conversions from Standard Input Rails |
Use Scenario: Supplying core voltage to ARM Cortex-M7 microcontrollers and associated peripherals in edge AI gateways. IC Role / Device Role / Timing Role: Adjustable-output buck regulator providing dynamically scaled VDDCORE with soft-start and precise enable control. Use Value: ±1.5% FB reference and 200-mΩ RDS(ON) ensure accurate voltage regulation and minimal dropout under dynamic load steps. | Use Scenario: Down-converting legacy 12-V or 24-V wall adapters to modern 3.3-V or 5-V USB-C PD accessory supplies. IC Role / Device Role / Timing Role: Single-chip solution replacing linear regulators or discrete buck controllers in cost-sensitive consumer and industrial adapters. Use Value: >90% efficiency eliminates heatsinks; SO PowerPAD package enables compact, thermally robust layout without external MOSFETs or drivers. |
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 | Lower 3-V minimum input, 1.5-A output, same package and pinout. | Better suited for low-input-voltage systems (e.g., 5-V rail); not rated for 42-V max input. | Select when input stays ≤32 V and load current ≤1.5 A; offers identical layout compatibility. |
| TPS54260DGQR | Wider 3.5–60-V input, 2.5-A output, integrated error amp compensation, no internal boot diode. | Supports higher input voltages and heavier loads; requires external bootstrap diode and compensation tuning. | Choose for 48-V telecom or automotive battery applications needing >42-V tolerance or >2-A capability. |
Compared with LM22670MRE-ADJ/NOPB and TPS54260DGQR, the LM22680MRE-ADJ/NOPB uniquely balances 42-V input rating, 2-A output, internal compensation, and integrated bootstrap diode in an HSOP-8 PowerPAD-making it optimal for space-constrained industrial 24-V systems requiring minimal external components and guaranteed stability.
Availability
LM22680MRE-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 automotive-grade reliability validation.
Supply support for LM22680MRE-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 LM22680MRE-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family-designed specifically for ease-of-use, minimal external component count, and rapid design-in of robust DC/DC buck regulators for industrial and automotive applications.
FAQ
What is the minimum input voltage required for stable operation of the LM22680MRE-ADJ/NOPB?
The LM22680MRE-ADJ/NOPB requires a minimum input voltage of 4.5 V for guaranteed operation across its full temperature and load range. Below this, undervoltage lockout (UVLO) disables the regulator; the rising UVLO threshold is 4.3 V (typ), falling threshold is 3.9 V (typ). For tighter control, the EN pin can be used with a resistor divider to set custom turn-on/off points-ensuring the LM22680MRE-ADJ/NOPB only activates when input voltage meets system requirements.
Can the LM22680MRE-ADJ/NOPB be synchronized to an external clock, and what are the constraints?
Yes, the LM22680MRE-ADJ/NOPB supports external synchronization via the RT/SYNC pin, but only if the external clock frequency exceeds the internal 500-kHz nominal frequency and remains below 1 MHz. The synchronizing signal must meet VSYNC thresholds (1.75 V min high, 0 V max low) and be applied before startup-mode is latched at power-on. Critically, synchronization disables current-limit foldback, so hard short-circuits may cause thermal stress. The LM22680MRE-ADJ/NOPB reverts to 500 kHz if the external clock is lost during operation.
How does the soft-start function work on the LM22680MRE-ADJ/NOPB, and how is it configured?
The LM22680MRE-ADJ/NOPB provides internal soft-start (~500 µs), extended by an external capacitor on the SS pin. Connecting a capacitor (100 nF–1 µF) between SS and GND increases ramp time per TSS ≈ 26 × 10³ × CSS. This prevents inrush current and output overshoot during power-up. Soft-start resets automatically during shutdown or thermal shutdown events. No pull-up or pull-down is needed-the SS pin is internally biased; the LM22680MRE-ADJ/NOPB interprets the capacitor value directly to scale the voltage ramp at the error amplifier input.
What thermal performance can be expected from the LM22680MRE-ADJ/NOPB in its HSOP-8 PowerPAD package?
The LM22680MRE-ADJ/NOPB in HSOP-8 PowerPAD (MR) has a junction-to-ambient thermal resistance (RθJA) of 60°C/W when mounted on 1 in² of 2-oz copper. Actual thermal performance depends on PCB layout: increasing copper area or adding thermal vias under the exposed pad lowers RθJA toward 42°C/W. The device includes thermal shutdown at 150°C (typ) and operates up to +125°C junction temperature. For continuous 2-A operation at high ambient, proper thermal design-including GND-connected PowerPAD-is essential to maintain reliability and avoid derating.
Is the LM22680MRE-ADJ/NOPB pin-compatible with other members of the LM226xx family?
Yes, the LM22680MRE-ADJ/NOPB shares identical pinout and package (HSOP-8 PowerPAD) with LM22670MRE-ADJ/NOPB and LM22680-Q1 variants. However, differences exist in maximum input voltage (42 V vs. 32 V), current limit (3.4 A vs. 2.8 A), and qualification (industrial vs. AEC-Q100 Grade 1). While PCB layouts are interchangeable, system-level validation is required when substituting-especially for input voltage margin, thermal headroom, and enable/UVLO behavior. The LM22680MRE-ADJ/NOPB is not pin-compatible with non-MR suffix variants or different package types.
LM22680MRE-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
LM22680MRE-ADJ/NOPB FAQ
1.How can I place an order for LM22680MRE-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22680MRE-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 LM22680MRE-ADJ/NOPB reliable?
The price and inventory of LM22680MRE-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 LM22680MRE-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22680MRE-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22680MRE-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22680MRE-ADJ/NOPB?
LM22680MRE-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22680MRE-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 LM22680MRE-ADJ/NOPB?
For technical support, including LM22680MRE-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22680MRE-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22680MRE-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22680MRE-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 LM22680MRE-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22680MRE-ADJ/NOPB?
All LM22680MRE-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22680MRE-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 LM22680MRE-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22680MRE-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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