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Texas Instruments LM2841XQMK/NOPB
- Part No.:
- LM2841XQMK/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2841XQMK/NOPB.pdf
- Description:
- IC REG BUCK ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,643
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Product details
Overview
LM2841XQMK/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, 550-kHz fixed switching frequency, and 4.5-V to 42-V input range-designed for industrial distributed power and battery-powered instrumentation.
For engineers reviewing the LM2841XQMK/NOPB datasheet, LM2841XQMK/NOPB pinout, LM2841XQMK/NOPB application, or LM2841XQMK/NOPB equivalent, key selection criteria include its 300-mA load capability, internal 0.9-Ω MOSFET, 16-µA shutdown quiescent current, thermal/UVLO protection, and compatibility with standard ceramic input/output capacitors and Schottky diodes.
Technical Context
The LM2841XQMK/NOPB implements current-mode PWM control with integrated high-side N-channel MOSFET and gate-driver bias circuitry (CB pin). Its functional block includes error amplifier, oscillator, PWM comparator, soft-start logic, and dedicated protection comparators for thermal shutdown, VIN undervoltage lockout, and CB undervoltage lockout.
It operates in continuous conduction mode with minimum ON-time of 100 ns and maximum duty cycle of 94%, enabling stable regulation down to ~0.8 V output when configured with external resistive divider. The FB pin senses output voltage via precision 0.765-V reference, supporting adjustable output configurations without external compensation components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide-range unregulated sources including automotive battery, industrial rails, and legacy power supplies. |
| Output Current | Up to 300 mA - sufficient for powering microcontrollers, sensors, and analog front-ends in portable and embedded systems. |
| Feedback Reference | 0.765 V ±1.7% - enables precise output voltage setting using standard resistor dividers; minimizes output error across temperature. |
| Switching Frequency | 550 kHz - balances efficiency and component size; allows use of compact 10–22 µH inductors and low-ESR ceramic capacitors. |
| RDS(ON) | 0.9 Ω typical - reduces conduction loss at full load, contributing to 85% typical efficiency at 12-V input / 3.3-V output. |
| Shutdown Quiescent Current | 16 µA typical - preserves battery life in always-on or low-power standby applications such as remote sensors. |
| Protection Features | Thermal shutdown (175°C), VIN UVLO (3.7 V on-threshold), CB UVLO, short-circuit limiting - ensures robust operation under fault conditions. |
Pinout & Package
LM2841XQMK/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 |
|---|---|---|
| CB | Bootstrap bias supply | Provides gate-drive voltage for internal high-side switch; requires 0.15-µF ceramic capacitor between CB and SW pins. |
| GND | Power ground reference | Common return path for internal circuitry, SW node current, and external feedback network; must be connected to low-impedance PCB ground plane. |
| FB | Feedback input | Senses 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 operation; must not float; internal pull-up not provided. |
| VIN | Main power input | Accepts 4.5–42 V DC; requires local 2.2-µF ceramic bypass capacitor near pin to suppress high-frequency transients. |
| SW | Switch node output | Drives external inductor and Schottky diode; connects to CBOOT capacitor; carries pulsed high-current waveform requiring tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation network - simplifies design, reduces BOM count, and improves stability across operating conditions. |
| Soft-start via SHDN pin | RC-controlled ramp-up of current limit enables user-defined start-up time - prevents inrush current and output overshoot during power-on. |
| Low-RDS(ON) MOSFET | 0.9 Ω typical RDS(ON) reduces conduction loss - maintains >80% efficiency even at 300-mA load and 42-V input. |
| Fixed-frequency PWM | 550-kHz operation enables predictable EMI profile and consistent filter design - avoids variable-frequency noise spreading complications. |
| Thermal & UVLO protection | Integrated die-temperature sensing and input-voltage monitoring - prevents damage during overloads, cold cranking, or brownout events. |
Applications
| Industrial Sensor Node Power | Portable Hand-Held Instrumentation |
|---|---|
|
Use Scenario: Powering 3.3-V microcontroller, analog sensor interface, and RF transceiver from a 12–24-V industrial bus or Li-ion battery pack. IC Role / Device Role / Timing Role: Primary step-down regulator providing regulated 3.3-V rail with fast transient response and low-noise output. Use Value: Delivers 300 mA continuously while maintaining <1% line/load regulation and 10-mV peak-to-peak ripple - meets MCU and ADC power integrity requirements. |
Use Scenario: Supplying 5-V or 3.3-V logic and analog sections in handheld multimeters, thermal imagers, or portable oscilloscopes. IC Role / Device Role / Timing Role: Compact, efficient DC/DC converter replacing linear regulators to extend battery runtime and reduce heat dissipation. Use Value: Achieves 85% typical efficiency at 100–300 mA loads - doubles battery life versus LDO solutions and eliminates heatsink requirements. |
| Battery-Powered Remote Monitoring | Distributed Control System Rail |
|
Use Scenario: Long-life solar- or battery-powered environmental sensor node operating in −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Input-wide buck regulator enabling direct connection to 12-V lead-acid or 24-V LiFePO₄ battery banks. Use Value: Operates down to 4.5 V input and shuts down cleanly below 3.7 V - prevents deep discharge and supports graceful system shutdown. |
Use Scenario: Generating localized 3.3-V or 5-V rails from 24-V or 48-V factory automation backplanes or PLC power buses. IC Role / Device Role / Timing Role: Point-of-load regulator with robust input surge tolerance and thermal resilience in high-temperature enclosures. Use Value: Withstands 42-V transients and features 121°C/W junction-to-ambient thermal resistance - sustains full 300-mA output at 85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2841YQMK/NOPB | 1.25-MHz switching frequency vs. 550 kHz; identical 300-mA rating, package, and pinout. | Better suited for space-constrained designs requiring smaller inductors/capacitors; higher switching loss at high input voltages. | Select LM2841YQMK/NOPB when board area is critical and efficiency at light loads is prioritized over heavy-load thermal performance. |
| TPS62840DRLR | 2.5-V to 6-V input range; 300-mA output; 1.8-MHz frequency; integrated synchronous rectification; 25-nA shutdown IQ. | Optimized for single-cell Li-ion or USB-powered devices-not compatible with 12–42-V industrial inputs. | Choose TPS62840DRLR only for ultra-low-power, narrow-input applications where LM2841XQMK/NOPB's wide VIN range is unnecessary. |
Compared with LM2841YQMK/NOPB and TPS62840DRLR, the LM2841XQMK/NOPB uniquely balances wide-input operation (4.5–42 V), moderate switching frequency (550 kHz), and proven ruggedness in industrial environments-making it optimal for distributed power where input variability and reliability outweigh ultra-miniaturization needs.
Availability
LM2841XQMK/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, portable hand-held instrumentation, and battery-powered remote monitoring requiring stable component supply and long-term manufacturability.
Supply support for LM2841XQMK/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, specializing in analog, embedded processing, and power management ICs with broad industrial, automotive, and consumer reach.
The LM2841XQMK/NOPB belongs to TI's SIMPLE SWITCHER® family-engineered for ease-of-use in cost-sensitive, space-constrained DC/DC conversion applications where minimal external components and robust protection are essential.
FAQ
What is the maximum output current supported by the LM2841XQMK/NOPB?
The LM2841XQMK/NOPB is rated for up to 300 mA DC output current under recommended operating conditions. This rating assumes proper thermal management, adequate input voltage (≥4.5 V), and use of appropriate external components-including a 10–22 µH inductor rated ≥0.7 A and low-ESR output capacitors. Peak current limit is 525 mA at room temperature, derating to 900 mA over full temperature range.
Does the LM2841XQMK/NOPB require external compensation components?
No, the LM2841XQMK/NOPB is internally compensated. Its control loop is optimized for stability with standard external components-specifically a 10–22 µH inductor, 0.15-µF bootstrap capacitor, and 22–100 µF output capacitor. No external RC networks or compensation pins are needed, reducing design complexity and PCB footprint.
How is the output voltage set on the LM2841XQMK/NOPB?
The output voltage is set using a resistive divider connected between VOUT, FB, and GND. The LM2841XQMK/NOPB references a precise 0.765-V internal bandgap at the FB pin, so VOUT = 0.765 V × (1 + R1/R2). For example, to achieve 3.3 V, use R2 = 1.02 kΩ and R1 = 3.4 kΩ. Resistor values should stay within 100 Ω to 10 kΩ to avoid bias current errors.
Can the LM2841XQMK/NOPB operate with an input voltage below 4.5 V?
No-the absolute minimum input voltage for functional operation is 4.5 V per the recommended operating conditions. Below this, the device enters undervoltage lockout (UVLO) and ceases switching. The UVLO turn-on threshold is 3.7 V (typical), but reliable regulation only begins above 4.5 V. Attempting operation below 4.5 V may result in unstable output or no regulation.
What package type and thermal characteristics does the LM2841XQMK/NOPB have?
The LM2841XQMK/NOPB uses the DDC (SOT-6L) package: 1.60 mm × 2.90 mm, low-profile surface-mount outline with exposed thermal pad. Its junction-to-ambient thermal resistance (RθJA) is 121°C/W on a standard 4-layer JEDEC board, enabling full 300-mA output at up to 85°C ambient when properly soldered to a thermal pad with ≥2x2 vias to inner ground planes.
LM2841XQMK/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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LM2841XQMK/NOPB FAQ
1.How can I place an order for LM2841XQMK/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2841XQMK/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 LM2841XQMK/NOPB reliable?
The price and inventory of LM2841XQMK/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2841XQMK/NOPB is usually 5 days.
3.What payment methods are accepted for LM2841XQMK/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2841XQMK/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2841XQMK/NOPB?
LM2841XQMK/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2841XQMK/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 LM2841XQMK/NOPB?
For technical support, including LM2841XQMK/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2841XQMK/NOPB requirements.
6.How does Aetrix verify that LM2841XQMK/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2841XQMK/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 LM2841XQMK/NOPB meets industry standards.
7.What is the process for return or replacement of LM2841XQMK/NOPB?
All LM2841XQMK/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2841XQMK/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 LM2841XQMK/NOPB part is unused and in its original packaging.
Return procedure for LM2841XQMK/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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