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Texas Instruments LM2841XMKX-ADJL/NOPB
- Part No.:
- LM2841XMKX-ADJL/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2841XMKX-ADJL/NOPB.pdf
- Description:
- IC REG BUCK ADJ 300MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,918
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Product details
Overview
LM2841XMKX-ADJL/NOPB from Texas Instruments is a non-synchronous step-down DC/DC regulator in SOT-6L package, delivering up to 300 mA output current with 0.765 V feedback reference voltage, 550 kHz fixed switching frequency, and 4.5 V to 42 V input range-used in industrial distributed power and portable instrumentation.
For engineers reviewing the LM2841XMKX-ADJL/NOPB datasheet, LM2841XMKX-ADJL/NOPB pinout, LM2841XMKX-ADJL/NOPB application, or LM2841XMKX-ADJL/NOPB equivalent, key selection criteria include adjustable output via resistor divider, low 16 µA shutdown current, internal 0.9 Ω high-side switch, thermal/UVLO protection, and SOT-6L layout compatibility for space-constrained designs.
Technical Context
The LM2841XMKX-ADJL/NOPB implements current-mode PWM control with integrated high-side N-channel MOSFET, using external diode and inductor in buck topology. Its 0.765 V FB reference enables precise output adjustment across 0.8 V to 36 V range when paired with standard resistor dividers.
It features dedicated gate-drive bias (CB pin), cycle-by-cycle current limiting modulated via SHDN pin voltage, and internally compensated error amplifier-eliminating need for external compensation components while supporting stable operation with ceramic output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide-input industrial and battery-powered systems without pre-regulation. |
| Output Current | Up to 300 mA - matches LM2841 variant rating; sufficient for microcontrollers, sensors, and analog circuitry. |
| Feedback Reference Voltage | 0.765 V ±1.5% - sets output accuracy and defines resistor-divider ratio for adjustable VOUT configurations. |
| Switching Frequency | 550 kHz - enables compact magnetics and low-output-ripple design with minimal EMI filtering. |
| Quiescent Current (Shutdown) | 16 µA typical - minimizes battery drain in always-on or low-power standby modes. |
| High-Side Switch RDS(on) | 0.9 Ω typical - ensures >85% typical efficiency at mid-load, reducing thermal load in SOT-6L package. |
| Minimum ON-Time | 100 ns - supports high VIN-to-VOUT ratios (e.g., 42 V → 3.3 V) without pulse-skipping instability. |
Pinout & Package
LM2841XMKX-ADJL/NOPB uses the DDC (SOT-6L) package: 1.60 mm × 2.90 mm, low-profile surface-mount outline with exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CB | Bootstrap bias supply | Provides gate drive voltage for internal high-side FET; requires 0.15 µF ceramic capacitor between CB and SW. |
| 2 - GND | Power and signal ground | Common return path for IC core, power stage, and feedback network; must be low-impedance PCB connection. |
| 3 - FB | Feedback input | Senses output voltage via resistor divider; 0.765 V reference triggers regulation loop correction. |
| 4 - SHDN | Logic-level enable/disable | Pull ≥2.3 V to enable; ≤0.3 V to enter 16 µA shutdown; not allowed to float; RC network enables soft-start. |
| 5 - VIN | Main power input | Accepts 4.5–42 V; supplies internal bias and high-side switch; requires local 2.2 µF ceramic input capacitor. |
| 6 - SW | Switch node output | Drives external inductor and catch diode; connects to CBOOT capacitor; carries high dI/dt switching current. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates external compensation components-reduces BOM count and layout sensitivity for rapid prototyping. |
| Thermal shutdown + UVLO + CB undervoltage lockout | Triple-protection architecture prevents damage during overtemperature, brownout, or insufficient gate drive conditions. |
| Soft-start via SHDN pin modulation | RC-controlled SHDN ramp tailors inrush current and output rise time-no additional soft-start IC required. |
| Low 16 µA shutdown IQ | Enables ultra-low-power system sleep states without compromising wake-up responsiveness or battery life. |
| Fixed 550 kHz switching frequency | Ensures predictable EMI profile and simplifies filter design versus variable-frequency alternatives. |
Applications
| Industrial Sensor Node Power | Portable Hand-Held Instrumentation |
|---|---|
Use Scenario: Powers 3.3 V microcontroller, ADC, and wireless transceiver from 12–24 V industrial bus or Li-ion battery pack. IC Role / Device Role / Timing Role: Primary non-isolated step-down regulator providing stable 3.3 V rail with tight line/load regulation. Use Value: Delivers 300 mA at >85% efficiency across full input range, enabling extended battery runtime and minimal heat dissipation in sealed enclosures. |
Use Scenario: Supplies 5 V logic and analog rails in handheld multimeters or portable oscilloscopes powered by 4×AA or 9 V battery. IC Role / Device Role / Timing Role: Adjustable buck converter configured for 5 V output using external resistor divider on FB pin. Use Value: Maintains regulation down to 4.5 V input-critical for end-of-battery-life operation-while consuming only 16 µA in shutdown. |
| Automotive Body Control Module (BCM) Sub-Rail | Distributed Industrial I/O Power |
Use Scenario: Generates 0.8 V core supply for automotive MCU in body control unit, fed from 12 V vehicle battery with load dump transients. IC Role / Device Role / Timing Role: Secondary regulated rail generator with UVLO threshold of 3.7 V (on) / 3.5 V (off) for robust cold-crank immunity. Use Value: Withstands 42 V max input and includes thermal shutdown-meets AEC-Q100 stress requirements when used within derated junction temperature limits. |
Use Scenario: Provides isolated 12 V auxiliary rail for fieldbus interface ICs (e.g., RS-485 transceivers) in PLC backplanes powered from 24 V DC supply. IC Role / Device Role / Timing Role: Compact, self-contained buck regulator replacing discrete controller + external MOSFET solutions. Use Value: SOT-6L footprint reduces PCB area by >40% vs. SOIC-8 alternatives while maintaining 300 mA capability and thermal performance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2841XMKX-3.3/NOPB | Fixed 3.3 V output; identical pinout, package, and 300 mA rating; no FB resistor divider needed. | Eliminates external resistors but lacks output adjustability-suitable only where 3.3 V is fixed requirement. | Select when board space or BOM simplicity outweighs need for output flexibility. |
| TPS54202DRCT | Synchronous buck; 4.5–28 V input; 2 A output; 500 kHz; requires external compensation; 10-pin WSON. | Higher current, smaller solution size, but needs more design effort and different layout due to synchronous rectification and pinout. | Choose for higher load demands (>300 mA) or where efficiency above 90% is mandatory at light loads. |
Compared with LM2841XMKX-ADJL/NOPB, the fixed-output LM2841XMKX-3.3/NOPB reduces component count but sacrifices adjustability, while TPS54202DRCT offers higher current and synchronous efficiency at the cost of increased design complexity and incompatible packaging.
Availability
LM2841XMKX-ADJL/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, portable instrumentation, automotive BCM sub-rails, and distributed I/O power requiring stable component supply with long-term manufacturability.
Supply support for LM2841XMKX-ADJL/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 LM284x family-including LM2841XMKX-ADJL/NOPB-is designed for cost-sensitive, space-constrained industrial and portable applications requiring wide-input, easy-to-use buck regulation without external compensation.
FAQ
What output voltage range does the LM2841XMKX-ADJL/NOPB support?
The LM2841XMKX-ADJL/NOPB supports adjustable output voltages from 0.8 V to 36 V, set by an external resistor divider on the FB pin using its 0.765 V reference voltage. This allows flexible configuration for diverse system rails including 1.8 V, 3.3 V, 5 V, and 12 V outputs without changing the IC.
Can the LM2841XMKX-ADJL/NOPB operate from a 48 V input source?
No-the LM2841XMKX-ADJL/NOPB has an absolute maximum input voltage rating of 45 V and recommended operating range of 4.5 V to 42 V. Applying 48 V exceeds specification and risks permanent damage; a pre-regulator or alternative 60 V-rated buck IC is required for 48 V input systems.
How is soft-start implemented on the LM2841XMKX-ADJL/NOPB?
Soft-start on the LM2841XMKX-ADJL/NOPB is implemented by applying a controlled RC ramp to the SHDN pin. As SHDN voltage rises from 0 V to 2.3 V, the internal current limit increases proportionally-limiting inrush current and controlling output voltage rise time without external soft-start circuitry.
Is an external Schottky diode required for the LM2841XMKX-ADJL/NOPB?
Yes-an external Schottky diode is mandatory for the LM2841XMKX-ADJL/NOPB because it is a non-synchronous buck regulator. The diode (e.g., MA2YD26) provides the return path for inductor current during the high-side switch off-time and must be rated for ≥25% above maximum input voltage and ≥300 mA average current.
What is the thermal performance of the LM2841XMKX-ADJL/NOPB in its SOT-6L package?
The LM2841XMKX-ADJL/NOPB has a junction-to-ambient thermal resistance (RθJA) of 121 °C/W in the DDC (SOT-6L) package. At 300 mA load and 12 V input, typical power dissipation is ~0.27 W, resulting in ~33 °C junction-to-ambient rise-well within the 125 °C max operating junction temperature when mounted on a standard 4-layer PCB.
LM2841XMKX-ADJL/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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):
- 0.765V
- Voltage - Output (Max):
- 34V
- Current - Output:
- 300mA
- Frequency - Switching:
- 550kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LM2841XMKX-ADJL/NOPB FAQ
1.How can I place an order for LM2841XMKX-ADJL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2841XMKX-ADJL/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 LM2841XMKX-ADJL/NOPB reliable?
The price and inventory of LM2841XMKX-ADJL/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2841XMKX-ADJL/NOPB is usually 5 days.
3.What payment methods are accepted for LM2841XMKX-ADJL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2841XMKX-ADJL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2841XMKX-ADJL/NOPB?
LM2841XMKX-ADJL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2841XMKX-ADJL/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 LM2841XMKX-ADJL/NOPB?
For technical support, including LM2841XMKX-ADJL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2841XMKX-ADJL/NOPB requirements.
6.How does Aetrix verify that LM2841XMKX-ADJL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2841XMKX-ADJL/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 LM2841XMKX-ADJL/NOPB meets industry standards.
7.What is the process for return or replacement of LM2841XMKX-ADJL/NOPB?
All LM2841XMKX-ADJL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2841XMKX-ADJL/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 LM2841XMKX-ADJL/NOPB part is unused and in its original packaging.
Return procedure for LM2841XMKX-ADJL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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