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Texas Instruments LM2841XQMKX/NOPB
- Part No.:
- LM2841XQMKX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2841XQMKX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,532
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Product details
Overview
LM2841XQMKX/NOPB from Texas Instruments is a 300 mA, 4.5V–42V input synchronous step-down DC/DC regulator in SOT-6L package, featuring 550 kHz fixed switching frequency, 0.765 V feedback reference, and integrated 0.9 Ω high-side MOSFET. It delivers regulated output voltage for industrial distributed power and battery-powered equipment with thermal shutdown, UVLO, and soft-start via SHDN pin.
For engineers reviewing the LM2841XQMKX/NOPB datasheet, LM2841XQMKX/NOPB pinout, LM2841XQMKX/NOPB application, or LM2841XQMKX/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), output current capability (300 mA), feedback voltage (0.765 V), switching frequency (550 kHz), and SOT-6L thermal performance (RθJA = 121 °C/W).
Technical Context
The LM2841XQMKX/NOPB implements current-mode PWM control with internal compensation and fixed 550 kHz oscillator. Its architecture integrates a high-side N-channel MOSFET with 0.9 Ω typical RDS(ON), bootstrap gate drive (CB/SW), and precision 0.765 V bandgap reference at FB.
Protection features include thermal shutdown (engages at ~175 °C), input UVLO (4.4 V on, 3.5 V off), CB under-voltage lockout, and cycle-by-cycle current limiting (525–900 mA). Soft-start is implemented externally via RC network on SHDN pin, enabling controlled output ramp-up without inrush current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide-input industrial and automotive power rails, including 12 V, 24 V, and 36 V nominal systems. |
| Output Current | 300 mA - optimized load capability per LM2841 family designation; enables compact buck conversion for mid-power peripherals. |
| Switching Frequency | 550 kHz - fixed X-version frequency allows small external inductors (e.g., 10–15 µH) and low-output-ripple designs. |
| Feedback Reference Voltage | 0.765 V - precise bandgap reference sets output via resistor divider; enables stable regulation across temperature (−40°C to +125°C). |
| RDS(ON) | 0.9 Ω (typ.) - low on-resistance MOSFET minimizes conduction loss and supports >85% typical efficiency at 12 VIN/3.3 VOUT. |
| Shutdown Quiescent Current | 16 µA (typ.) - ultra-low IQ in shutdown extends battery life in portable applications requiring intermittent operation. |
| Thermal Resistance | RθJA = 121 °C/W - SOT-6L package enables moderate power dissipation without forced airflow in space-constrained layouts. |
Pinout & Package
SOT-6L package (Package Drawing DDC), 2.9 mm × 1.6 mm × 1.0 mm profile, thermally enhanced for surface-mount PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Provides gate drive voltage for internal high-side FET; requires 0.15 µF ceramic cap between CB and SW. |
| GND | Power and signal ground reference | Primary return path for IC bias, feedback, and power stage; must connect directly to system ground plane at single point. |
| 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 control | Pull ≥2.3 V to enable; ≤0.9 V to disable; supports RC soft-start by modulating current limit during startup. |
| VIN | Main power input | Accepts 4.5–42 V unregulated input; requires local 2.2–10 µF low-ESR ceramic bypass capacitor near pin. |
| SW | Switch node | Drives external inductor and Schottky diode; connects to CBOOT; carries high di/dt; layout critical for EMI control. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated current-mode control | Eliminates need for external compensation components; simplifies design and improves transient response stability. |
| Integrated high-side MOSFET (0.9 Ω RDS(ON)) | Reduces BOM count and PCB area vs. controller + external FET solutions; enables full buck converter in 6-pin SOT. |
| Soft-start via SHDN pin | Enables user-defined startup time using external RC network; prevents output overshoot and input inrush current. |
| Short-circuit and thermal protection | Auto-recovery current limiting and thermal shutdown prevent damage during fault conditions without external circuitry. |
| Low shutdown IQ (16 µA) | Minimizes standby power draw in battery-backed systems; supports long-term sleep modes in portable instrumentation. |
Applications
| Industrial Distributed Power | Battery-Powered Equipment |
|---|---|
Use Scenario: Powering microcontrollers, sensors, and interface ICs from 24 V or 36 V factory bus rails. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering stable 3.3 V or 5 V from wide-input industrial supply. Use Value: 42 V max input withstands load-dump transients; 121 °C/W RθJA sustains operation at +85 °C ambient without derating. |
Use Scenario: Regulating voltage for handheld test meters, portable data loggers, and wireless sensor nodes. IC Role / Device Role / Timing Role: Efficient step-down converter extending battery runtime while maintaining tight output regulation. Use Value: 16 µA shutdown current preserves battery charge during idle; 550 kHz switching enables compact 10 µH inductor + 22 µF output cap solution. |
| Portable Media Players | Portable Hand-Held Instruments |
Use Scenario: Supplying clean 1.2 V or 1.8 V core voltage to audio codecs or low-power DSPs in media playback devices. IC Role / Device Role / Timing Role: Secondary buck regulator generating low-noise intermediate rail from main battery supply. Use Value: Fixed-frequency PWM ensures predictable EMI spectrum; FB reference accuracy (±18 mV) maintains stable core voltage under varying load. |
Use Scenario: Providing isolated, regulated 5 V for USB peripherals or display backlight drivers in field-service tools. IC Role / Device Role / Timing Role: Compact, self-contained buck IC eliminating need for discrete FET and driver in space-limited enclosures. Use Value: SOT-6L footprint (2.9 × 1.6 mm) fits tight mechanical constraints; integrated soft-start prevents display flicker during power-on. |
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/NOPB | Same electrical specs and pinout; differs only in tape-and-reel packaging (3000-unit reel vs. 1000-unit reel for QMKX variant). | No functional difference; identical performance and layout compatibility. | Select LM2841XQMKX/NOPB for smaller-volume prototyping or mixed-BOM builds; LM2841XMKX/NOPB preferred for high-volume production. |
| LM2842XQMKX/NOPB | Higher 600 mA output current rating, same 550 kHz frequency and 0.765 V FB reference; shares SOT-6L package and pinout. | Supports higher-load applications (e.g., multi-rail systems) without redesign; requires verification of thermal margin at full load. | Choose LM2842XQMKX/NOPB when future-proofing for increased load or consolidating BOMs across 300/600 mA variants. |
Compared with LM2841XMKX/NOPB, the LM2841XQMKX/NOPB offers identical functionality in a different reel configuration, while LM2842XQMKX/NOPB provides headroom for higher current without changing layout-enabling scalable power design with minimal requalification.
Availability
LM2841XQMKX/NOPB is available at Aetrix Electronics and suitable for industrial distributed power, battery-powered equipment, and portable hand-held instruments requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM2841XQMKX/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 LM2841 series belongs to TI's thin-SOT buck regulator product line, designed specifically for space-constrained industrial and portable applications demanding wide-input operation, integrated power stages, and robust protection.
FAQ
What is the maximum input voltage rating for the LM2841XQMKX/NOPB?
The LM2841XQMKX/NOPB has an absolute maximum input voltage rating of +45 V, with normal operating range specified from 4.5 V to 42 V. Operation within the 4.5–42 V range ensures full compliance with electrical characteristics across −40°C to +125°C junction temperature. Exceeding 42 V may trigger UVLO or cause stress beyond guaranteed specifications.
Does the LM2841XQMKX/NOPB require an external bootstrap capacitor?
Yes, the LM2841XQMKX/NOPB requires a minimum 0.15 µF ceramic capacitor connected between CB and SW pins to sustain gate drive for the internal high-side MOSFET. TI recommends X5R/X7R dielectric; larger values (up to 1 µF) improve reliability when VIN < 2×VOUT.
Can the LM2841XQMKX/NOPB be used in automotive applications?
The LM2841XQMKX/NOPB is a catalog-grade device rated for −40°C to +125°C junction temperature but is not AEC-Q100 qualified. For automotive applications, TI offers the pin-compatible LM2841XQMKX/NOPB-Q1 variant, which undergoes additional qualification testing for vibration, temperature cycling, and lifetime reliability.
What is the purpose of the FB pin voltage specification of 0.765 V in the LM2841XQMKX/NOPB?
The 0.765 V at the FB pin is the internal precision bandgap reference voltage used by the error amplifier to regulate output. The output voltage is set by VOUT = 0.765 V × (1 + R1/R2), where R1 and R2 form a resistive divider from VOUT to GND. This value enables accurate, temperature-stable regulation across the full operating range.
How does the SHDN pin implement soft-start in the LM2841XQMKX/NOPB?
The SHDN pin modulates the cycle-by-cycle current limit during startup: applying a rising voltage (0–2.3 V) via an external RC network gradually increases the switch current limit from minimum to full rating, controlling output voltage rise time and limiting inrush current. No separate soft-start pin is required.
LM2841XQMKX/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:
- Obsolete
- 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
LM2841XQMKX/NOPB FAQ
1.How can I place an order for LM2841XQMKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2841XQMKX/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 LM2841XQMKX/NOPB reliable?
The price and inventory of LM2841XQMKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2841XQMKX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2841XQMKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2841XQMKX/NOPB transactions.
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4.How is shipping managed for LM2841XQMKX/NOPB?
LM2841XQMKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2841XQMKX/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 LM2841XQMKX/NOPB?
For technical support, including LM2841XQMKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2841XQMKX/NOPB requirements.
6.How does Aetrix verify that LM2841XQMKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2841XQMKX/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 LM2841XQMKX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2841XQMKX/NOPB?
All LM2841XQMKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2841XQMKX/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 LM2841XQMKX/NOPB part is unused and in its original packaging.
Return procedure for LM2841XQMKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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