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Texas Instruments LM2841XMK-ADJL/NOPB
- Part No.:
- LM2841XMK-ADJL/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2841XMK-ADJL/NOPB.pdf
- Description:
- IC REG BUCK ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,948
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Product details
Overview
LM2841XMK-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 (X variant), and 4.5 V to 42 V input range. It integrates a 0.9 Ω typical RDS(ON) power switch and supports adjustable output via external resistor divider for battery-powered instrumentation and industrial distributed power.
For engineers reviewing the LM2841XMK-ADJL/NOPB datasheet, LM2841XMK-ADJL/NOPB pinout, LM2841XMK-ADJL/NOPB application, or LM2841XMK-ADJL/NOPB equivalent, key selection considerations include its 300 mA load capability, 16 µA shutdown quiescent current, thermal/UVLO protection, soft-start implementation via SHDN pin, and compatibility with ceramic input/output capacitors and Schottky diodes in compact SOT-6L layouts.
Technical Context
The LM2841XMK-ADJL/NOPB implements current-mode PWM control with internal compensation and fixed 550 kHz oscillator. Its functional block includes error amplifier, bandgap reference, PWM comparator, gate driver, and protection circuitry for thermal shutdown, VIN undervoltage lockout (3.7 V turn-on), and CB undervoltage lockout.
It operates in continuous conduction mode with minimum on-time of 100 ns and maximum duty cycle of 94%. Feedback regulation uses a precision 0.765 V reference, enabling output voltages from 0.8 V to 36 V via external R1/R2 divider, while maintaining ±1.5% output voltage accuracy over temperature and line/load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide-input industrial and automotive battery systems without pre-regulation. |
| Output Current | Up to 300 mA - matches LM2841 family rating; sufficient for low-power microcontrollers, sensors, and analog circuitry. |
| Feedback Reference Voltage | 0.765 V ±1.5% - enables precise output setting with standard resistor tolerances; reduces divider current error vs. higher references. |
| Switching Frequency | 550 kHz - balances efficiency and component size; allows use of small 10–22 µH inductors and low-ESR ceramic capacitors. |
| RDS(ON) | 0.9 Ω typical - minimizes conduction loss at 300 mA, supporting >85% typical efficiency at 12 VIN/3.3 VOUT. |
| Shutdown Quiescent Current | 16 µA typical - extends battery life in always-on or sleep-mode applications such as portable instruments. |
| Thermal Shutdown Threshold | 175°C typical - protects device during overload or poor PCB thermal design; auto-recovery at 155°C. |
Pinout & Package
SOT-6L (DDC) package: 1.60 mm × 2.90 mm body, low-profile surface-mount footprint optimized for thermal performance and layout simplicity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Provides gate drive voltage for internal high-side MOSFET; requires 0.15 µF ceramic capacitor between CB and SW. |
| GND | Power and signal ground | Common return path for input, output, feedback, and shutdown circuits; must be low-impedance for stable regulation. |
| FB | Feedback input | Monitors output voltage via resistor divider; regulates VOUT = 0.765 V × (1 + R1/R2); bias current <1 µA minimizes divider error. |
| SHDN | Logic-level enable/disable | Pull to GND disables regulator (16 µA IQ); pull ≥2.3 V enables; must not float; supports RC soft-start timing. |
| VIN | Main power input | Accepts 4.5–42 V; includes UVLO (3.7 V turn-on) and ESD protection; requires local 2.2 µF ceramic bypass capacitor. |
| SW | Switch node output | Drives external inductor and Schottky diode; connects to CBOOT; handles peak currents up to 900 mA during current limiting. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation network; simplifies design and reduces BOM count for stable operation across loads. |
| Soft-start via SHDN pin | RC network on SHDN modulates current limit during startup, controlling output rise time and limiting inrush into output capacitance. |
| Short-circuit protected | Current-limit architecture limits SW peak current to 900 mA (typical), preventing damage during output short or overload. |
| Low RDS(ON) switch | 0.9 Ω typical reduces conduction loss, enabling high efficiency (>85%) even at full 300 mA load with minimal thermal rise. |
| Thermal and UVLO protection | Integrated thermal shutdown (175°C) and input UVLO (3.7 V) ensure safe operation under fault or brownout conditions. |
Applications
| Battery-Powered Instrumentation | Industrial Distributed Power |
|---|---|
Use Scenario: Portable handheld multimeter powered by 9 V alkaline or 2-cell Li-ion battery (6–8.4 V). IC Role / Device Role / Timing Role: Primary step-down regulator generating stable 3.3 V for MCU, ADC, and display backlight. Use Value: 550 kHz switching enables compact 15 µH inductor and 22 µF ceramic output capacitor; 16 µA shutdown current preserves battery shelf life. |
Use Scenario: DIN-rail mounted sensor node converting 24 V industrial bus to 5 V for fieldbus interface and analog front-end. IC Role / Device Role / Timing Role: Point-of-load regulator providing isolated 5 V rail with high input voltage tolerance and thermal robustness. Use Value: 42 V max input withstands transients on 24 V systems; 0.765 V FB reference ensures accurate 5 V output across temperature (-40°C to 125°C). |
| Portable Media Players | Automotive Body Electronics |
Use Scenario: MP3 player using single-cell Li-ion (3.0–4.2 V) with boost converter followed by LM2841XMK-ADJL/NOPB for 1.8 V core supply. IC Role / Device Role / Timing Role: Secondary buck regulator delivering low-noise 1.8 V to audio codec and flash memory controller. Use Value: Internally compensated design avoids stability issues with low-ESR ceramic caps; soft-start prevents pop noise during power-up. |
Use Scenario: Automotive door module powered from 12 V battery with load dump protection, requiring 3.3 V for CAN transceiver and microcontroller. IC Role / Device Role / Timing Role: Input-tolerant buck regulator supplying regulated 3.3 V despite cold-crank (down to 4.5 V) and load-dump (up to 42 V) events. Use Value: Wide 4.5–42 V input range covers full automotive battery envelope; thermal shutdown prevents latch-up during sustained overloads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2841XMK-3.3/NOPB | Fixed 3.3 V output; no FB divider required; identical 300 mA rating, 550 kHz, and SOT-6L package. | Eliminates two resistors but lacks output adjustability; suitable only where 3.3 V is mandatory. | Select when board space or BOM count is critical and output voltage is fixed at 3.3 V. |
| TPS62840DRVR | Higher efficiency (92% typ), 1.8–5.5 V input, 1.8 V to 5.5 V output, 300 mA, 2.25 MHz, WSON-6 package. | Requires external compensation; better suited for ultra-low-IQ (300 nA) battery applications but narrower input range. | Prefer for sub-µA shutdown current and higher-frequency designs where 4.5–42 V input is not required. |
Compared with LM2841XMK-ADJL/NOPB, the fixed-output LM2841XMK-3.3/NOPB reduces external components but sacrifices flexibility, while the TPS62840DRVR offers superior light-load efficiency and lower IQ but cannot handle >5.5 V input-making LM2841XMK-ADJL/NOPB optimal for wide-input, adjustable-output industrial and automotive use cases.
Availability
LM2841XMK-ADJL/NOPB is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial distributed power, and portable media players requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature and input voltage ranges.
Supply support for LM2841XMK-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 company headquartered in Dallas, Texas, designing and manufacturing analog, embedded processing, and logic ICs for industrial, automotive, and consumer markets.
The LM284x SIMPLE SWITCHER® product line was developed to deliver easy-to-use, internally compensated DC/DC buck regulators for space-constrained applications where reliability, wide input range, and minimal external components are critical.
FAQ
What is the maximum output current supported by the LM2841XMK-ADJL/NOPB?
The LM2841XMK-ADJL/NOPB is rated for up to 300 mA DC output current under recommended operating conditions. This is confirmed in the Electrical Characteristics table (ICL parameter for LM2841), with current limit specified at 525 mA minimum and 900 mA maximum across temperature. The device maintains regulation and thermal safety within this range when used with appropriate PCB copper area and ambient temperature ≤125°C.
How do I set the output voltage for the LM2841XMK-ADJL/NOPB?
The LM2841XMK-ADJL/NOPB uses an adjustable feedback architecture with a 0.765 V reference. Set VOUT using two external resistors: VOUT = 0.765 V × (1 + R1/R2). For example, to achieve 5 V, select R2 = 1.02 kΩ and R1 = 5.62 kΩ. Resistor values should be between 100 Ω and 10 kΩ to minimize bias current error, and both must be 1% tolerance for best accuracy.
Does the LM2841XMK-ADJL/NOPB require external compensation components?
No, the LM2841XMK-ADJL/NOPB is internally compensated. Its control loop is designed for stability with standard ceramic input and output capacitors (e.g., 2.2 µF CIN, 22–47 µF COUT) and typical inductor values (10–22 µH). No external compensation network is needed, reducing design complexity and BOM cost compared to many competing buck controllers.
What protection features does the LM2841XMK-ADJL/NOPB include?
The LM2841XMK-ADJL/NOPB integrates thermal shutdown (engages at ~175°C), input undervoltage lockout (UVLO turns on at 3.7 V, off at 3.5 V), CB undervoltage lockout, short-circuit current limiting (900 mA typical peak), and gate-drive monitoring. These features operate autonomously without external circuitry, ensuring robust operation during faults, start-up, or transient overloads.
Can the LM2841XMK-ADJL/NOPB be used in automotive applications?
Yes, the LM2841XMK-ADJL/NOPB supports automotive environments with its 4.5 V to 42 V input range-covering cold-crank (≥4.5 V) and load-dump (≤42 V) conditions-and guaranteed operation from –40°C to +125°C junction temperature. While not AEC-Q200 qualified, its electrical and thermal specifications align with common body electronics requirements such as door modules and sensor nodes.
LM2841XMK-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:
- TSOT-23-6
LM2841XMK-ADJL/NOPB FAQ
1.How can I place an order for LM2841XMK-ADJL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2841XMK-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 LM2841XMK-ADJL/NOPB reliable?
The price and inventory of LM2841XMK-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 LM2841XMK-ADJL/NOPB is usually 5 days.
3.What payment methods are accepted for LM2841XMK-ADJL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2841XMK-ADJL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2841XMK-ADJL/NOPB?
LM2841XMK-ADJL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2841XMK-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 LM2841XMK-ADJL/NOPB?
For technical support, including LM2841XMK-ADJL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2841XMK-ADJL/NOPB requirements.
6.How does Aetrix verify that LM2841XMK-ADJL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2841XMK-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 LM2841XMK-ADJL/NOPB meets industry standards.
7.What is the process for return or replacement of LM2841XMK-ADJL/NOPB?
All LM2841XMK-ADJL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2841XMK-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 LM2841XMK-ADJL/NOPB part is unused and in its original packaging.
Return procedure for LM2841XMK-ADJL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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