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Texas Instruments LM2841YMKX-ADJL/NOPB
- Part No.:
- LM2841YMKX-ADJL/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2841YMKX-ADJL/NOPB.pdf
- Description:
- IC REG BUCK ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,008
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Product details
Overview
LM2841YMKX-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, 1.25-MHz fixed switching frequency, and 4.5-V to 42-V input range. It integrates a 0.9-Ω typical RDS(ON) power switch and supports adjustable output voltage via external resistor divider for industrial distributed power and battery-powered instrumentation.
For engineers reviewing the LM2841YMKX-ADJL/NOPB datasheet, LM2841YMKX-ADJL/NOPB pinout, LM2841YMKX-ADJL/NOPB application, or LM2841YMKX-ADJL/NOPB equivalent, key selection criteria include its 1.25-MHz operation enabling compact external components, 16-µA shutdown quiescent current, internal compensation, thermal/UVLO protection, and soft-start control via SHDN pin.
Technical Context
The LM2841YMKX-ADJL/NOPB implements current-mode PWM control with fixed 1.25-MHz oscillator, minimum ON/OFF times of 100 ns/104 ns, and maximum duty cycle of 87%. Its error amplifier compares FB voltage against 0.765 V reference, driving a gate driver that controls the integrated N-channel MOSFET.
Protection features include thermal shutdown (engages at 175°C), VIN undervoltage lockout (turn-on threshold 3.7 V), CB undervoltage lockout, and cycle-by-cycle current limiting (rated at 525 mA typical). Shutdown is logic-controlled via SHDN pin with 1-V turn-on and 0.9-V turn-off thresholds.
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 variant rating for mid-power point-of-load conversion |
| Switching Frequency | 1.25 MHz - enables use of small inductors (e.g., 10–15 µH) and ceramic capacitors for compact layout |
| Feedback Reference Voltage | 0.765 V - sets output via resistor divider; allows precise adjustment from 0.8 V to >30 V |
| RDS(ON) | 0.9 Ω typical - minimizes conduction loss and improves efficiency at medium load currents |
| Shutdown Quiescent Current | 16 µA typical - extends battery life in always-on or low-duty-cycle portable systems |
| Minimum ON-Time | 100 ns - supports high VIN/VOUT ratios (e.g., 42 V → 3.3 V) without pulse-skipping instability |
Pinout & Package
SOT-6L (DDC) package: 1.60 mm × 2.90 mm, low-profile surface-mount, thermally enhanced with exposed pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CB | Bootstrap bias supply | Connects external 0.15-µF ceramic capacitor to SW; provides gate drive voltage for internal high-side switch |
| 2 - GND | Power and signal ground | Primary return path for IC core, power switch, and feedback network; requires low-impedance PCB connection |
| 3 - FB | Feedback input | Senses output voltage divider; 0.765-V reference enables accurate regulation; bias current <1 µA minimizes divider error |
| 4 - SHDN | Logic enable/disable control | Pull ≥2.3 V to enable; ≤0.9 V to disable; 16-µA shutdown IQ achieved when pulled low |
| 5 - VIN | Main power input | Accepts 4.5–42 V; internal UVLO prevents operation below 3.7 V; requires local 2.2-µF ceramic bypass |
| 6 - SW | Switch node output | Drives external inductor and Schottky diode; connects to CBOOT; handles peak currents up to 900 mA |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation network - reduces BOM count and design iteration time |
| Soft-start via SHDN pin | RC-controlled ramp limits inrush current - avoids input rail sag and output overshoot during power-up |
| Short-circuit protected | Cycle-by-cycle current limiting trips at 525 mA - prevents damage during output fault without latch-up |
| Thermal shutdown | Auto-recovery at 155°C after trip at 175°C - protects die under sustained overload or poor heatsinking |
| Low EMI layout optimized | SOT-6L pinout separates power and signal paths - minimizes loop area for SW, VIN, and GND to reduce radiated noise |
Applications
| Industrial Sensor Node Power | Portable Handheld Instrument |
|---|---|
Use Scenario: Powering 3.3-V microcontroller, analog front-end, and wireless transceiver from 12–24-V field bus or Li-ion battery pack. IC Role / Device Role / Timing Role: Primary buck regulator providing stable 3.3-V rail; 1.25-MHz switching avoids audible noise and simplifies filtering. Use Value: 85% typical efficiency at 200 mA enables >10-hour runtime on 2000-mAh battery; 16-µA shutdown extends shelf life. | Use Scenario: Generating 5-V USB-compatible rail from 7–42-V input in handheld multimeter or data logger. IC Role / Device Role / Timing Role: Adjustable-output step-down converter; FB pin allows precise 5.0-V setting via 5.62k/1.02k resistor divider. Use Value: Wide 4.5–42-V input accommodates degraded battery or unregulated wall adapter; SOT-6L footprint saves board space. |
| Automotive Body Control Module | Remote I/O Terminal |
Use Scenario: Supplying 12-V logic and interface circuitry from 15–42-V vehicle battery with cold-crank tolerance. IC Role / Device Role / Timing Role: High-input buck regulator configured for 12-V output; UVLO ensures operation only above 3.7 V. Use Value: 42-V absolute max rating withstands load-dump transients; thermal shutdown prevents failure during enclosure overheating. | Use Scenario: Providing 0.8-V core voltage for low-power FPGA or ASIC in DIN-rail mounted remote I/O unit. IC Role / Device Role / Timing Role: Adjustable buck controller supporting sub-1-V outputs; 0.765-V reference enables accurate low-VOUT setting. Use Value: Minimum 100-ns ON-time supports 42-V → 0.8-V conversion (D ≈ 2%) without pulse skipping; maintains regulation stability. |
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-ADJ/NOPB | Same family, X-option: 550-kHz switching frequency instead of 1.25 MHz | Better efficiency at high loads due to lower switching loss; larger inductor/capacitor required | Select for higher efficiency >200 mA or where EMI sensitivity favors lower frequency |
| TPS562201DDCR | Synchronous buck, 4.5–17-V input, 2-A output, 650-kHz, smaller SOT-23-6 package | Higher current capability and synchronous rectification improve light-load efficiency but require different layout | Select for >300 mA loads or where 17-V max input is sufficient and board space is constrained |
Compared with LM2841XMKX-ADJ/NOPB, the LM2841YMKX-ADJL/NOPB trades higher switching loss for smaller magnetics and lower EMI at high frequencies; versus TPS562201DDCR, it offers wider input range and higher voltage tolerance at the cost of lower output current and asynchronous topology.
Availability
LM2841YMKX-ADJL/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, portable handheld instruments, automotive body control modules, and remote I/O terminals requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM2841YMKX-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 digital signal processing technologies since 1930.
The LM284x series belongs to TI's SIMPLE SWITCHER® portfolio, engineered for ease-of-use in cost-sensitive, space-constrained DC/DC conversion applications where minimal external components and robust protection are critical.
FAQ
What is the maximum input voltage rating for LM2841YMKX-ADJL/NOPB?
The LM2841YMKX-ADJL/NOPB has an absolute maximum input voltage rating of 45 V, with recommended operating range from 4.5 V to 42 V. Operation beyond 42 V risks exceeding safe junction temperature or triggering internal protection circuits, and is not supported per datasheet specifications. The device's UVLO turns off operation below 3.7 V to prevent unstable startup.
How is output voltage adjusted on LM2841YMKX-ADJL/NOPB?
The LM2841YMKX-ADJL/NOPB uses the FB pin with an external resistor divider to set output voltage per VOUT = 0.765 V × (1 + R1/R2). For example, a 5.62-kΩ/R1 and 1.02-kΩ/R2 yields 5.0 V. Resistors should be between 100 Ω and 10 kΩ to minimize bias current error, and the FB pin draws less than 1 µA, ensuring high accuracy.
Does LM2841YMKX-ADJL/NOPB require an external bootstrap capacitor?
Yes, LM2841YMKX-ADJL/NOPB requires a minimum 0.15-µF ceramic capacitor between CB and SW pins. This bootstrap capacitor supplies gate drive voltage for the internal high-side MOSFET. In applications where VIN < 2×VOUT, a larger value (up to 1 µF) is recommended to maintain low RDS(ON) and ensure reliable switching across line and load conditions.
What protection features does LM2841YMKX-ADJL/NOPB include?
The LM2841YMKX-ADJL/NOPB integrates thermal shutdown (trip at 175°C), VIN undervoltage lockout (3.7-V turn-on), CB undervoltage lockout, cycle-by-cycle current limiting (525 mA typical), and short-circuit protection. These operate independently during normal regulation and do not require external components, enhancing system reliability in harsh environments.
Can LM2841YMKX-ADJL/NOPB be used in automotive applications?
LM2841YMKX-ADJL/NOPB supports automotive body electronics applications with its –40°C to 125°C operating junction temperature, 42-V input rating (withstands load dump), and robust protection features. While not AEC-Q200 qualified, it is widely deployed in non-safety-critical automotive subsystems such as infotainment power rails and sensor interfaces where TI's LM284x family meets functional requirements.
LM2841YMKX-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:
- 1.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LM2841YMKX-ADJL/NOPB FAQ
1.How can I place an order for LM2841YMKX-ADJL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2841YMKX-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 LM2841YMKX-ADJL/NOPB reliable?
The price and inventory of LM2841YMKX-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 LM2841YMKX-ADJL/NOPB is usually 5 days.
3.What payment methods are accepted for LM2841YMKX-ADJL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2841YMKX-ADJL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2841YMKX-ADJL/NOPB?
LM2841YMKX-ADJL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2841YMKX-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 LM2841YMKX-ADJL/NOPB?
For technical support, including LM2841YMKX-ADJL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2841YMKX-ADJL/NOPB requirements.
6.How does Aetrix verify that LM2841YMKX-ADJL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2841YMKX-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 LM2841YMKX-ADJL/NOPB meets industry standards.
7.What is the process for return or replacement of LM2841YMKX-ADJL/NOPB?
All LM2841YMKX-ADJL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2841YMKX-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 LM2841YMKX-ADJL/NOPB part is unused and in its original packaging.
Return procedure for LM2841YMKX-ADJL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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