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Texas Instruments LM2841YMK-ADJL/NOPB
- Part No.:
- LM2841YMK-ADJL/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2841YMK-ADJL/NOPB.pdf
- Description:
- IC REG BUCK ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:771
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Product details
Overview
LM2841YMK-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, 1.25 MHz fixed switching frequency (Y option), and 4.5 V to 42 V input range - used in battery-powered instrumentation and industrial distributed power supplies.
For engineers reviewing the LM2841YMK-ADJL/NOPB datasheet, LM2841YMK-ADJL/NOPB pinout, LM2841YMK-ADJL/NOPB application, or LM2841YMK-ADJL/NOPB equivalent, key selection criteria include verified 300 mA load capability, 1.25 MHz operation enabling compact external components, low 16 µA shutdown current, internal 0.9 Ω MOSFET switch, and adjustable output via FB pin.
Technical Context
The LM2841YMK-ADJL/NOPB implements current-mode PWM control with cycle-by-cycle current limiting and thermal shutdown at 175°C. Its internal high-side N-channel MOSFET features 0.9 Ω typical RDS(ON), and gate drive is managed via CB–SW bootstrap circuitry with dedicated CB undervoltage lockout.
It operates in continuous conduction mode with minimum ON-time of 100 ns and maximum duty cycle of 87% (Y option), supporting output voltage adjustment from 0.765 V upward using an external resistor divider on the FB pin. Input UVLO activates at 3.7 V (on) / 3.5 V (off).
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 - confirmed for LM2841 variant per device family specification and electrical characteristics table. |
| Switching Frequency | 1.25 MHz (Y option) - enables use of small inductors (e.g., 10–15 µH) and ceramic capacitors for compact layout. |
| Feedback Reference Voltage | 0.765 V ±1.5% - sets output voltage accuracy and allows precise adjustment down to sub-1 V with external resistors. |
| Shutdown Quiescent Current | 16 µA typical - minimizes battery drain in standby mode for portable equipment. |
| RDS(ON) | 0.9 Ω typical - ensures >85% typical efficiency at mid-load and reduces thermal stress under full 300 mA load. |
| 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 body size, low-profile surface-mount construction optimized for thermal performance and PCB space efficiency.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap bias supply | 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 internal circuitry, feedback amplifier, and thermal sensing; must be low-impedance PCB plane. |
| FB | Feedback input | Monitors output voltage via resistor divider; regulates VOUT = 0.765 V × (1 + R1/R2); bias current <1 µA avoids divider error. |
| SHDN | Logic-level enable/disable | Pull ≥2.3 V to enable; ≤0.3 V to disable; 16 µA shutdown current; must not float - tie to VIN if unused. |
| VIN | Main power input | Accepts 4.5–42 V; includes UVLO (3.7 V on/3.5 V off) and internal ESD protection; decoupled with 2.2 µF ceramic capacitor. |
| SW | Switch node output | Drives external inductor and Schottky diode; connects to CBOOT; peak voltage reaches VIN during operation. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation network - simplifies design and improves stability across operating conditions. |
| Soft-start via SHDN pin | RC-controlled ramp-up of current limit enables user-tailored startup time and limits inrush current into output capacitance. |
| Short-circuit protected | Cycle-by-cycle current limiting prevents damage during output fault; limits switch current to 525 mA (typical) at room temperature. |
| Thermal shutdown | Engages at 175°C (typical) and releases at 155°C (typical) - protects die integrity during overload or poor heatsinking. |
| Low EMI layout support | SOT-6L pinout places GND, VIN, and SW adjacent for minimal high-di/dt loop area - reduces radiated emissions. |
Applications
| Battery-Powered Instrumentation | Industrial Distributed Power |
|---|---|
Use Scenario: Portable handheld multimeter powered by 9 V alkaline or Li-ion battery pack (6–42 V range). IC Role / Device Role / Timing Role: Primary step-down regulator converting variable battery voltage to stable 3.3 V for MCU, display, and analog front-end. Use Value: 1.25 MHz operation allows 15 µH inductor and 47 µF ceramic output cap - achieving <10 mm² solution size while maintaining >88% efficiency at 200 mA. |
Use Scenario: Remote sensor node in factory automation system powered from 24 V DC bus with transient surges. IC Role / Device Role / Timing Role: Local point-of-load converter generating 5 V for microcontroller and interface ICs from unregulated 24 V rail. Use Value: 42 V absolute max input rating and integrated UVLO prevent malfunction during line transients; 300 mA output supports dual-rail LDOs downstream. |
| Portable Media Players | Automotive Body Electronics |
Use Scenario: Flash-based audio player with 3.7 V Li-ion battery and requirement for 1.2 V core and 3.3 V I/O rails. IC Role / Device Role / Timing Role: Adjustable buck regulator configured for 1.2 V output via FB divider, powering SoC core domain. Use Value: 0.765 V reference enables accurate low-VOUT regulation; 16 µA shutdown current extends battery life during pause mode. |
Use Scenario: Interior lighting control module supplied from vehicle battery (9–16 V nominal, up to 42 V load dump). IC Role / Device Role / Timing Role: Pre-regulator stepping 12 V down to 5 V for CAN transceiver and microcontroller. Use Value: Robust 42 V input tolerance and thermal shutdown ensure reliability during cold-crank and load-dump events per ISO 7637-2. |
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-ADJL/NOPB | 550 kHz switching frequency (X option) vs. 1.25 MHz (Y); identical 300 mA rating, same package and pinout. | Better efficiency at light loads; larger inductor/capacitor required; lower EMI but larger solution size. | Select X variant when board space permits larger magnetics and lower EMI is prioritized over footprint. |
| TPS62840DRVR | 1.8–6.5 V input (not 4.5–42 V); 300 mA output; 1.8 MHz; integrated synchronous rectifier; 25 nA IQ. | Not suitable for high-input applications; superior light-load efficiency and smaller solution size below 6.5 V. | Choose TPS62840 only for low-voltage battery systems (<6.5 V); LM2841YMK-ADJL/NOPB remains required for 12–42 V inputs. |
Compared with LM2841XMK-ADJL/NOPB, the LM2841YMK-ADJL/NOPB trades higher-frequency operation for smaller passives and faster transient response, while the TPS62840DRVR offers ultra-low IQ but lacks high-input capability - making LM2841YMK-ADJL/NOPB uniquely suited for wide-input industrial and automotive auxiliary rails.
Availability
LM2841YMK-ADJL/NOPB is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial distributed power supplies, and portable media players requiring stable component supply and long-term production continuity.
Supply support for LM2841YMK-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, specializing in analog, embedded processing, and power management technologies since 1930.
The LM284x series belongs to TI's SIMPLE SWITCHER® portfolio - designed specifically for ease-of-use, minimal external component count, and robust operation in harsh industrial and automotive environments.
FAQ
What is the maximum output current supported by the LM2841YMK-ADJL/NOPB?
The LM2841YMK-ADJL/NOPB is rated for up to 300 mA DC output current, as confirmed in the device family description, electrical characteristics table (ILSW and ICL parameters), and product folder documentation. This rating holds across the full −40°C to +125°C junction temperature range and 4.5 V to 42 V input range, with derating applied only under high ambient or poor thermal conditions.
Does the LM2841YMK-ADJL/NOPB require an external compensation network?
No, the LM2841YMK-ADJL/NOPB is internally compensated - meaning no external Type-II or Type-III compensation components are needed. This simplifies design, reduces BOM count, and ensures stable operation across all recommended input/output combinations without tuning.
How is the output voltage adjusted on the LM2841YMK-ADJL/NOPB?
The LM2841YMK-ADJL/NOPB uses its FB pin to sense output voltage via an external resistor divider. With a precise 0.765 V internal reference, VOUT = 0.765 V × (1 + R1/R2). Resistor values between 100 Ω and 10 kΩ are recommended to minimize bias current error and noise sensitivity.
What is the purpose of the CB pin on the LM2841YMK-ADJL/NOPB?
The CB pin on the LM2841YMK-ADJL/NOPB supplies gate drive voltage to the internal high-side N-channel MOSFET. It must be connected to SW through a 0.15 µF (minimum) ceramic capacitor (CBOOT) to generate the boosted voltage required for full enhancement of the switch, ensuring low RDS(ON) and high efficiency.
Can the LM2841YMK-ADJL/NOPB operate with an input voltage below 4.5 V?
No - the LM2841YMK-ADJL/NOPB has a guaranteed minimum operating input voltage of 4.5 V, enforced by internal UVLO that disables the device below ~3.5 V (off threshold) and re-enables above ~3.7 V (on threshold). Operation below 4.5 V violates recommended conditions and may result in unstable regulation or failure to start.
LM2841YMK-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
LM2841YMK-ADJL/NOPB FAQ
1.How can I place an order for LM2841YMK-ADJL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2841YMK-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 LM2841YMK-ADJL/NOPB reliable?
The price and inventory of LM2841YMK-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 LM2841YMK-ADJL/NOPB is usually 5 days.
3.What payment methods are accepted for LM2841YMK-ADJL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2841YMK-ADJL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2841YMK-ADJL/NOPB?
LM2841YMK-ADJL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2841YMK-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 LM2841YMK-ADJL/NOPB?
For technical support, including LM2841YMK-ADJL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2841YMK-ADJL/NOPB requirements.
6.How does Aetrix verify that LM2841YMK-ADJL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2841YMK-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 LM2841YMK-ADJL/NOPB meets industry standards.
7.What is the process for return or replacement of LM2841YMK-ADJL/NOPB?
All LM2841YMK-ADJL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2841YMK-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 LM2841YMK-ADJL/NOPB part is unused and in its original packaging.
Return procedure for LM2841YMK-ADJL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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