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Texas Instruments LM2841XBMKX/NOPB
- Part No.:
- LM2841XBMKX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2841XBMKX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 300MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,741
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Product details
Overview
LM2841XBMKX/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 LM2841XBMKX/NOPB datasheet, LM2841XBMKX/NOPB pinout, LM2841XBMKX/NOPB application, or LM2841XBMKX/NOPB equivalent, key selection criteria include input voltage range, output current capability, shutdown quiescent current (16 µA), thermal shutdown behavior (175°C trip), and internal switch RDS(ON) (0.9 Ω typical).
Technical Context
The LM2841XBMKX/NOPB implements current-mode PWM control with internal N-channel MOSFET, fixed 550-kHz oscillator, and cycle-by-cycle overcurrent protection. Its feedback loop uses a precision 0.765-V bandgap reference to regulate output via external resistor divider.
Functional modes include normal operation, shutdown (reducing IQ to 16 µA), and thermal shutdown (175°C trip). Protection features include VIN undervoltage lockout (3.7-V turn-on), gate-drive UVLO, short-circuit limiting, and soft-start controlled via SHDN pin RC network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide-input industrial and battery-derived supplies without pre-regulation. |
| Max Output Current | 300 mA - defines maximum continuous load for LM2841 variant; higher than LM2840 (100 mA), lower than LM2842 (600 mA). |
| Switching Frequency | 550 kHz - enables compact external components (e.g., 15-µH inductor, 0.15-µF CBOOT) while maintaining low output ripple. |
| Feedback Reference Voltage | 0.765 V - sets output voltage accuracy and stability; used with R1/R2 divider to configure VOUT = 0.765 × (1 + R1/R2). |
| Shutdown Quiescent Current | 16 µA typical - minimizes system standby power loss in battery-powered applications. |
| Internal Switch RDS(ON) | 0.9 Ω typical - determines conduction loss and efficiency at light-to-moderate loads; impacts thermal design. |
| Thermal Shutdown Threshold | 175°C typical - protects die during overload or poor PCB thermal management; recovers at ~155°C. |
Pinout & Package
SOT-6L (DDC) package: 1.60 mm × 2.90 mm body size, low-profile surface-mount footprint optimized for space-constrained designs.
| 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. |
| GND | Power and signal ground | Common return path for VIN, SW, FB, and SHDN; must be low-impedance and thermally coupled to PCB copper pour. |
| FB | Feedback input | Monitors output voltage via resistor divider; regulates VOUT to 0.765 V at this pin; bias current ≤1 µA. |
| SHDN | Logic-level enable/disable | Pull ≥2.3 V to enable; ≤0.3 V to disable; ties to VIN if unused; must not float; injects ≤1.5 µA leakage current. |
| VIN | Main power input | Accepts 4.5–42 V; powers internal circuitry and switch driver; requires local 2.2-µF ceramic decoupling to GND. |
| SW | Switch node output | Drives external inductor and Schottky diode; connects to CBOOT; carries pulsed current up to 900 mA peak. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation network-reduces BOM count and layout sensitivity. |
| Soft-start via SHDN pin | RC network on SHDN modulates current limit during startup, controlling output rise time and limiting inrush. |
| Short-circuit protected | Cycle-by-cycle current limiting prevents damage during output short; limits peak switch current to 900 mA. |
| Low RDS(ON) switch | 0.9-Ω typical ON-resistance improves efficiency at 300-mA load, reducing thermal stress vs. higher-RDS(ON) alternatives. |
| Fixed-frequency PWM | 550-kHz operation enables predictable EMI filtering and consistent inductor sizing across designs. |
Applications
| Industrial Distributed Power | Portable Hand-Held Instruments |
|---|---|
|
Use Scenario: Regulating 24-V or 36-V rail to 3.3-V or 5-V for microcontrollers and sensors in factory-floor equipment. IC Role / Device Role / Timing Role: Primary non-isolated buck converter providing stable, efficient local power with minimal external parts. Use Value: Wide 4.5–42-V input accommodates unregulated industrial supplies; 300-mA output supports multi-rail sensor nodes without derating. |
Use Scenario: Powering digital logic and analog front-ends in handheld multimeters, data loggers, and field testers. IC Role / Device Role / Timing Role: Main DC/DC regulator converting primary battery voltage (e.g., 9-V alkaline or Li-ion) to fixed logic rails. Use Value: 16-µA shutdown current extends battery life; small SOT-6L footprint fits tight enclosures; 550-kHz switching avoids audible noise. |
| Battery-Powered Equipment | Portable Media Players |
|
Use Scenario: Supplying regulated 3.3-V power to wireless modules (BLE, LoRa) in remote monitoring devices. IC Role / Device Role / Timing Role: Efficient step-down regulator interfacing directly with battery pack, supporting intermittent transmit bursts. Use Value: Thermal shutdown (175°C) prevents failure during high-duty-cycle RF transmission; UVLO ensures clean start-up as battery depletes. |
Use Scenario: Generating 1.8-V or 2.8-V core voltage for audio codecs and display drivers in MP3 players and voice recorders. IC Role / Device Role / Timing Role: Secondary buck stage delivering low-noise, tightly regulated voltage for sensitive analog circuits. Use Value: 0.765-V feedback reference enables accurate low-VOUT setting with standard resistor values; internal compensation simplifies layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2841YMKX/NOPB | 1.25-MHz switching frequency vs. 550 kHz; same 300-mA rating, 0.765-V reference, and SOT-6L package. | Enables smaller inductors/capacitors but increases switching losses at high input voltages. | Select Y version when board area is critical and efficiency at light loads is acceptable trade-off. |
| LM2842XMKX/NOPB | 600-mA output capability, identical 550-kHz frequency and 0.765-V reference; shares pinout and package. | Supports higher-current loads without redesign; dissipates more heat under full load due to same RDS(ON). | Choose LM2842XMKX/NOPB if future-proofing for >300-mA loads or margin is required; verify thermal performance. |
Compared with LM2841YMKX/NOPB, the LM2841XBMKX/NOPB trades higher-frequency component savings for improved heavy-load efficiency; versus LM2842XMKX/NOPB, it offers lower thermal stress and cost at the expense of current headroom.
Availability
LM2841XBMKX/NOPB is available at Aetrix Electronics and suitable for industrial distributed power, portable hand-held instruments, and battery-powered equipment requiring stable component supply and long-term production continuity.
Supply support for LM2841XBMKX/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 specializing in analog and embedded processing technologies, with leadership in power management ICs and broad industrial design support infrastructure.
The LM284x family-including LM2841XBMKX/NOPB-is designed for simple, robust, wide-input DC/DC conversion in space- and cost-sensitive applications where minimal external components and proven reliability are essential.
FAQ
What is the maximum output current supported by the LM2841XBMKX/NOPB?
The LM2841XBMKX/NOPB supports a maximum continuous output current of 300 mA. This rating is confirmed in the Electrical Characteristics table under "ICL Switch current limit" for LM2841, with typical peak limit of 900 mA. The device maintains regulation across its full input range (4.5 V to 42 V) at this load, assuming adequate thermal management per the 121°C/W junction-to-ambient thermal resistance.
Does the LM2841XBMKX/NOPB require external compensation components?
No, the LM2841XBMKX/NOPB is internally compensated. As stated in the Features section and confirmed in Section 7.3.1, no external compensation network is needed-reducing bill-of-materials count and eliminating layout sensitivity associated with compensation capacitor placement. This simplifies design and improves consistency across production units.
How is the output voltage set on the LM2841XBMKX/NOPB?
The output voltage of the LM2841XBMKX/NOPB is set using a resistor divider connected between VOUT, FB, and GND. With a precise 0.765-V internal reference at the FB pin, VOUT = 0.765 V × (1 + R1/R2). Typical design starts with R2 = 1.02 kΩ and calculates R1-for example, 3.4 kΩ yields 3.3 V. Resistor values must stay within 100 Ω to 10 kΩ to avoid bias current errors.
What is the purpose of the CB pin on the LM2841XBMKX/NOPB?
The CB (bootstrap) pin on the LM2841XBMKX/NOPB supplies gate drive voltage to the internal high-side N-channel MOSFET. A ceramic capacitor (≥0.15 µF) must be placed between CB and SW to generate the boosted voltage needed for full enhancement. Without proper CB/SW capacitance, RDS(ON) rises, causing excessive conduction loss and potential thermal shutdown.
Can the LM2841XBMKX/NOPB operate with an input voltage below 4.5 V?
No-the LM2841XBMKX/NOPB has a guaranteed minimum operating input voltage of 4.5 V, enforced by internal undervoltage lockout (UVLO) that disables switching below ~3.7 V (typical turn-on threshold). Operation below 4.5 V risks erratic behavior or failure to start; for sub-4.5-V inputs, consider alternative regulators such as the TPS6286x series or LM267x family.
LM2841XBMKX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Bulk
- 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):
- 39.48V
- 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
LM2841XBMKX/NOPB FAQ
1.How can I place an order for LM2841XBMKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2841XBMKX/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 LM2841XBMKX/NOPB reliable?
The price and inventory of LM2841XBMKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2841XBMKX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2841XBMKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2841XBMKX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2841XBMKX/NOPB?
LM2841XBMKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2841XBMKX/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 LM2841XBMKX/NOPB?
For technical support, including LM2841XBMKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2841XBMKX/NOPB requirements.
6.How does Aetrix verify that LM2841XBMKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2841XBMKX/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 LM2841XBMKX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2841XBMKX/NOPB?
All LM2841XBMKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2841XBMKX/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 LM2841XBMKX/NOPB part is unused and in its original packaging.
Return procedure for LM2841XBMKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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