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Texas Instruments LM22680MR-ADJ/NOPB
- Part No.:
- LM22680MR-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM22680MR-ADJ/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOPWR
- Quantity:
- Payment:
- Shipping:
Inventory:2,921
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Product details
Overview
LM22680MR-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 rails.
For engineers reviewing the LM22680MR-ADJ/NOPB datasheet, LM22680MR-ADJ/NOPB pinout, LM22680MR-ADJ/NOPB application, or LM22680MR-ADJ/NOPB equivalent, key selection criteria include its 500 kHz default switching frequency, precision enable threshold (1.6 V typ), ±1.5% feedback reference accuracy, integrated bootstrap diode, and thermal shutdown protection - all critical for stable 24-V/12-V conversion in embedded systems.
Technical Context
The LM22680MR-ADJ/NOPB implements a voltage-mode PWM architecture with input voltage feedforward to stabilize loop gain against VIN variations, enabling optimized transient response without external compensation. Its internal Type III compensator ensures stability across wide inductor/capacitor ranges while supporting ceramic output capacitors with low ESR.
It features a dedicated BOOT pin for high-side gate drive, RT/SYNC pin for frequency adjustment (200–1000 kHz) or synchronization, and SS pin for programmable soft-start via external capacitor. The EN pin provides precision enable control with 0.6 V hysteresis and 25 µA shutdown current, enabling robust power sequencing in multi-rail systems.
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 | Up to 2 A continuous - sufficient for powering microcontrollers, FPGAs, and analog circuitry in industrial controllers. |
| 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 200–1000 kHz - balances efficiency, component size, and EMI filtering requirements. |
| RDS(ON) | 200 mΩ (typ) - reduces conduction loss and improves thermal performance at full load. |
| Junction Temp Range | –40°C to +125°C - qualified for harsh environments including factory automation and telecom infrastructure. |
| Quiescent Current | 3.4 mA (typ) at VFB = 5 V - minimizes no-load power draw in always-on subsystems. |
| Shutdown Current | 25 µA (typ) - enables ultra-low-power standby modes in battery-backed or energy-sensitive designs. |
Pinout & Package
LM22680MR-ADJ/NOPB uses the HSOP-8 PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground for enhanced heat dissipation. Thermal resistance is 60°C/W (RθJA) with 1 in² copper area.
| 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; pulls up internally at 6 µA. |
| 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 | Selects internal 500 kHz, resistor-adjusted (200–1000 kHz), or external clock synchronization mode. |
| FB | Feedback input | Monitors output via resistor divider; regulates output to 1.285 V reference with ±1.5% accuracy. |
| GND | System ground | Power and signal return; exposed pad must be connected to PCB ground plane for thermal and electrical integrity. |
| VIN | Main power input | Accepts 4.5–42 V; supplies internal bias and high-side driver; requires local 10 µF ceramic input capacitor. |
| SS | Soft-start timing | Controls startup ramp time via external capacitor; default internal soft-start is ~500 µs. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated voltage-mode control | Eliminates need for external compensation network - simplifies design and reduces BOM count for buck converters. |
| Stable with low-ESR ceramic capacitors | Enables use of compact, high-reliability MLCCs instead of bulkier electrolytics - improves long-term stability and temperature performance. |
| Integrated bootstrap diode | Removes requirement for external bootstrap diode - reduces layout complexity and failure points in high-side gate drive path. |
| Adjustable soft-start via SS pin | Prevents inrush current and output overshoot by scaling startup time with external capacitor (100 nF–1 µF). |
| Precision enable with UVLO | Allows clean power sequencing and prevents operation below 4.3 V input - protects downstream circuitry during brownout conditions. |
| Thermal shutdown & current limiting | Protects device under overload or poor heatsinking; current limit triggers at 2.8 A (typ), foldback activates under short-circuit. |
Applications
| Industrial Control | Telecom/Datacom Systems |
|---|---|
Use Scenario: Powering PLC I/O modules, motor drivers, and sensor interfaces in factory automation cabinets with 24-V DC bus. IC Role / Device Role / Timing Role: Primary 3.3-V or 5-V point-of-load regulator converting unregulated 24-V rail with tight line/load regulation. Use Value: Delivers 2 A at >90% efficiency with minimal thermal rise, enabling fanless enclosure designs and reducing system cooling cost. | Use Scenario: Generating intermediate 5-V or 12-V rails in telecom line cards, base station control units, and optical transceivers. IC Role / Device Role / Timing Role: High-reliability buck converter handling wide input transients (e.g., 42-V surges) while maintaining regulated output during hot-swap events. Use Value: Withstand 42-V absolute max rating and –40°C to +125°C operation ensures uptime in outdoor cabinets and central office environments. |
| Embedded Systems | Conversions from Standard Input Rails |
Use Scenario: Supplying core logic, memory, and peripherals in ruggedized edge computing devices deployed in transportation or energy sectors. IC Role / Device Role / Timing Role: Main DC/DC regulator providing stable 1.2-V to 3.3-V outputs for ARM Cortex or RISC-V SoCs with dynamic load steps. Use Value: Fast transient response and internal compensation ensure output stability during CPU burst loads without external tuning. | Use Scenario: Down-converting legacy 24-V, 12-V, or 5-V system rails to modern low-voltage logic supplies in retrofitted equipment. IC Role / Device Role / Timing Role: Efficient, drop-in replacement for linear regulators or older switching ICs - eliminates heat sinks and improves power density. Use Value: 4.5–42 V input range covers all common industrial and automotive supply voltages, simplifying BOM across product variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM22670MR-ADJ/NOPB | Same pinout, 3-A rating, higher RDS(ON) (150 mΩ), 40-V max input | Higher output current capability but lower input voltage ceiling - suitable where 42-V surge immunity is not required | Choose when >2 A load current is needed and input stays ≤40 V; verify thermal margin with larger inductor. |
| TPS54202DDCR | 3-A, 2.95–17-V input, 500-kHz fixed frequency, no RT/SYNC or SS pins | Lacks frequency adjust/sync and soft-start control - simpler but less flexible for EMI-sensitive or sequenced systems | Choose for cost-sensitive, space-constrained 12-V applications where 42-V tolerance and advanced control features are unnecessary. |
Compared with LM22680MR-ADJ/NOPB, LM22670MR-ADJ/NOPB offers higher current but reduced input voltage headroom, while TPS54202DDCR trades flexibility for integration and cost in mid-range input applications - making LM22680MR-ADJ/NOPB optimal for 24-V/42-V industrial systems requiring programmability and ruggedness.
Availability
LM22680MR-ADJ/NOPB is available at Aetrix Electronics and suitable for industrial control, telecom infrastructure, and embedded systems requiring stable component supply, long-lifecycle support, and AEC-Q100-aligned reliability.
Supply support for LM22680MR-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 power conversion solutions.
The LM22680MR-ADJ/NOPB belongs to TI's SIMPLE SWITCHER® family - designed specifically for ease-of-use in industrial and automotive DC/DC applications, emphasizing minimal external components, WEBENCH® design integration, and robust operation across extreme temperatures.
FAQ
What is the minimum recommended input voltage for reliable operation of the LM22680MR-ADJ/NOPB?
The LM22680MR-ADJ/NOPB has a recommended minimum input voltage of 4.5 V per its operating conditions. Below this, undervoltage lockout (UVLO) may activate, preventing regulation. The rising UVLO threshold is 4.3 V (typ), so sustained operation below 4.5 V risks intermittent enable/disable cycling. For battery-powered systems near end-of-discharge, use the EN pin with an external resistor divider to set a custom UVLO threshold above 4.5 V to ensure clean shutdown before instability occurs. The LM22680MR-ADJ/NOPB remains fully functional across its entire 4.5–42 V range.
Can the LM22680MR-ADJ/NOPB synchronize its switching frequency to an external clock source?
Yes, the LM22680MR-ADJ/NOPB supports external clock synchronization via the RT/SYNC pin. When an external clock signal with amplitude meeting VSYNC specifications (1.75 V threshold, 3.5 V typical) and frequency between 500 kHz and 1 MHz is applied, the device latches into sync mode at startup. Synchronization occurs on the rising edge of the external clock. Note that frequency adjustment (via RT resistor) and synchronization cannot operate simultaneously - the mode is determined during initial power-up based on RT/SYNC pin voltage. Loss of the external clock causes automatic fallback to the internal 500 kHz oscillator. This behavior is fully documented for the LM22680MR-ADJ/NOPB.
How does the soft-start function work on the LM22680MR-ADJ/NOPB, and what capacitor value should I use?
The LM22680MR-ADJ/NOPB implements soft-start by controlling the rate at which the internal error amplifier reference ramps up, limiting inrush current and output overshoot. An internal soft-start time of ~500 µs is provided, but this can be extended using an external capacitor on the SS pin. The approximate soft-start time is calculated as TSS ≈ 26 × 10³ × CSS, where CSS is in farads. For example, a 100 nF capacitor yields ~2.6 ms, while 1 µF gives ~26 ms. Recommended values range from 100 nF to 1 µF; values outside this range may cause excessive delay or insufficient control. Soft-start resets automatically during shutdown or thermal fault events - a key behavior confirmed for the LM22680MR-ADJ/NOPB.
Does the LM22680MR-ADJ/NOPB require an external bootstrap diode?
No, the LM22680MR-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 functional block diagram. The BOOT pin connects directly to the SW node through the internal diode and high-side gate driver. Users must still place a 10 nF ceramic capacitor between BOOT and SW with low-inductance PCB traces to ensure proper gate drive voltage generation. Omitting this capacitor - not the diode - will cause failure. This integration reduces bill-of-materials count and improves reliability compared to discrete bootstrap solutions, and applies specifically to the LM22680MR-ADJ/NOPB.
What is the thermal performance of the LM22680MR-ADJ/NOPB in its HSOP-8 PowerPAD package?
The LM22680MR-ADJ/NOPB in the HSOP-8 PowerPAD package has a junction-to-ambient thermal resistance (RθJA) of 60°C/W when mounted on 1 in² of 2-oz copper PCB area. Its maximum junction temperature is 150°C, and it includes thermal shutdown at 150°C (typ). Actual thermal performance depends heavily on PCB layout: the exposed pad must be soldered to a solid ground plane with multiple thermal vias. Under 2 A load at 12 V input → 3.3 V output, typical board-level temperature rise is ~35°C above ambient. Derating is required above 85°C ambient; full 2 A output is guaranteed only up to 125°C junction temperature. These thermal metrics are measured and specified for the LM22680MR-ADJ/NOPB.
LM22680MR-ADJ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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
LM22680MR-ADJ/NOPB FAQ
1.How can I place an order for LM22680MR-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM22680MR-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 LM22680MR-ADJ/NOPB reliable?
The price and inventory of LM22680MR-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 LM22680MR-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM22680MR-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM22680MR-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM22680MR-ADJ/NOPB?
LM22680MR-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM22680MR-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 LM22680MR-ADJ/NOPB?
For technical support, including LM22680MR-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM22680MR-ADJ/NOPB requirements.
6.How does Aetrix verify that LM22680MR-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM22680MR-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 LM22680MR-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM22680MR-ADJ/NOPB?
All LM22680MR-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM22680MR-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 LM22680MR-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM22680MR-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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