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Texas Instruments LM2841YQMKX/NOPB
- Part No.:
- LM2841YQMKX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2841YQMKX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,835
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Product details
Overview
LM2841YQMKX/NOPB from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade, 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 16 µA shutdown quiescent current. It operates across 4.5 V to 42 V input range and is used in ADAS camera power rails.
For engineers reviewing the LM2841YQMKX/NOPB datasheet, LM2841YQMKX/NOPB pinout, LM2841YQMKX/NOPB application, or LM2841YQMKX/NOPB equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal and protection behavior, and real-world design constraints for high-reliability vehicle subsystems.
Technical Context
The LM2841YQMKX/NOPB implements a current-mode PWM buck architecture with internal 0.9 Ω (typ) N-channel MOSFET switch, gate-drive undervoltage lockout on CB pin, and cycle-by-cycle overcurrent limiting modulated via SHDN pin voltage. Its fixed 1.25 MHz switching frequency enables compact external passive sizing while maintaining low output ripple under transient load steps.
Thermal shutdown engages at 175°C (typ) and releases at 155°C (typ); input UVLO turns off operation below 3.7 V (on-threshold) and prevents restart until VIN rises above 4.4 V. The device uses internal compensation and requires no external compensation network - simplifying layout and reducing BOM count for space-constrained automotive modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct battery connection across cold-crank (4.5 V) and load-dump (42 V) conditions in automotive systems. |
| Max Output Current | 300 mA - matches LM2841-Q1 variant rating; sufficient for powering image sensors, CAN transceivers, or microcontroller cores in ADAS nodes. |
| Switching Frequency | 1.25 MHz (Y option) - enables use of ≤22 µH inductors and ceramic capacitors under 100 µF, minimizing solution footprint. |
| Feedback Reference Voltage | 0.765 V - sets output voltage via resistor divider (VOUT = 0.765 × (1 + R1/R2)); tolerance ±1.8% over –40°C to +125°C. |
| Shutdown Quiescent Current | 16 µA (typ) - ensures ultra-low standby power draw during vehicle sleep mode without compromising wake-up responsiveness. |
| Internal Switch RDS(ON) | 0.9 Ω (typ) - contributes to 85% typical efficiency at 12 VIN/3.3 VOUT/100 mA; reduces thermal stress in SOT-6L package. |
| Min ON/OFF Time | 100 ns / 104 ns - supports stable regulation down to ~2.6 V output at 42 V input (D ≈ 6.2%) without pulse-skipping artifacts. |
Pinout & Package
SOT-6L (DDC) package: 1.60 mm × 2.90 mm body size, 0.95 mm max height, thermally enhanced exposed pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap bias supply | Connects to SW node via 0.15 µF ceramic capacitor; supplies gate drive voltage for internal high-side FET - must not float or exceed 7 V above SW. |
| GND | Power and signal ground | Primary return path for switch current, feedback network, and internal bias - requires low-impedance PCB connection to minimize noise coupling into FB. |
| FB | Feedback input | Senses output voltage via resistor divider; 0.1 µA (max) bias current mandates R1+R2 ≤ 10 kΩ to avoid gain error; sensitive to EMI near inductor. |
| SHDN | Logic-level enable/disable | Pull ≥2.3 V to enable; ≤0.3 V to disable; 0.05 µA (typ) input bias allows RC soft-start implementation; must never float. |
| VIN | Main power input | Accepts 4.5–42 V; includes UVLO (3.7 V on, 3.5 V off) and reverse-polarity protection diode not integrated - external protection required. |
| SW | Switch node output | Drives external inductor and catch diode; carries pulsed high-current waveform - requires short, wide trace and local CBOOT placement. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with full electrical testing per automotive reliability standards. |
| Internally compensated control loop | Eliminates need for external compensation components - reduces design cycle time and PCB area in cost-sensitive modules. |
| Soft-start via SHDN pin | RC network on SHDN modulates current limit from zero to full scale, controlling output rise time and inrush current without extra ICs. |
| Short-circuit and thermal protection | Auto-recovery current limiting and thermal shutdown (175°C trip) prevent damage during sustained overload or poor heatsinking. |
| Low EMI layout support | Pinout optimized for minimal high-di/dt loop area: VIN→SW→inductor→COUT→GND; CB/SW adjacency minimizes bootstrap loop inductance. |
Applications
| Automotive ADAS Camera Power Supply | Automotive Wireless Charging Control Module |
|---|---|
Use Scenario: Powers 3.3-V image sensor and ISP in forward-facing camera module mounted behind windshield. IC Role / Device Role / Timing Role: Primary buck regulator converting 12-V battery rail to stable 3.3-V supply; regulates during engine cranking (4.5 V) and load dump (42 V). Use Value: 1.25-MHz switching avoids AM radio band interference; 300-mA capability supports burst-mode sensor readout without dropout. |
Use Scenario: Supplies 5-V logic and gate drivers for Qi-compliant wireless charging controller in center console. IC Role / Device Role / Timing Role: Secondary regulated rail derived from main 12-V bus; maintains tight 5-V tolerance during high-power transmission bursts. Use Value: 0.765-V feedback reference enables precise 5-V output with <1% error; shutdown current <20 µA extends vehicle sleep duration. |
| Automotive Body Control Unit (BCU) Lighting Driver | Automotive HVAC Actuator Microcontroller Supply |
Use Scenario: Generates 8-V supply for LED driver ICs controlling adaptive front lighting system (AFS) matrix beams. IC Role / Device Role / Timing Role: Non-isolated step-down stage feeding downstream linear regulators; handles wide input transients during alternator load changes. Use Value: 42-V absolute max input withstands load dump spikes; internal 0.9-Ω switch limits self-heating in confined BCU enclosure. |
Use Scenario: Provides clean 3.3-V supply to HVAC actuator MCU during cabin temperature ramp-up with simultaneous blower motor activation. IC Role / Device Role / Timing Role: Point-of-load regulator decoupling MCU from noisy 12-V chassis supply; immune to conducted noise from brushed motors. Use Value: Current-mode control ensures stable regulation under fast-changing load steps; thermal shutdown prevents latch-up during prolonged stall events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2841XQMKX/NOPB | 550-kHz switching frequency (X option) vs. 1.25-MHz (Y); identical pinout, package, and 300-mA rating. | Better efficiency at light loads; larger inductors/capacitors required - preferred for thermally constrained but low-noise environments. | Select X variant when EMI filtering is critical and board space permits larger passives; Y variant when footprint and high-frequency noise immunity dominate. |
| TPS54202QDDCRQ1 | Synchronous buck (no external diode), 400-kHz to 2.5-MHz adjustable frequency, 2-A rating, SOIC-8 package. | Higher current, lower IQ (2 µA), but requires external compensation and larger footprint - suited for next-gen modules scaling beyond 300 mA. | Choose TPS54202QDDCRQ1 only if future-proofing for >300 mA loads or synchronous efficiency gains outweigh SOT-6L size advantage. |
Compared with LM2841XQMKX/NOPB, the LM2841YQMKX/NOPB trades higher-frequency operation for smaller magnetics and tighter transient response, while the TPS54202QDDCRQ1 offers scalability at the cost of layout complexity and package size - making LM2841YQMKX/NOPB optimal for cost- and space-constrained 300-mA automotive point-of-load designs.
Availability
LM2841YQMKX/NOPB is available at Aetrix Electronics and suitable for automotive ADAS camera power supplies, wireless charging control modules, and body control unit lighting drivers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM2841YQMKX/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 analog and embedded processing chips for industrial, automotive, and personal electronics markets.
The LM284x-Q1 product line was developed specifically for AEC-Q100-compliant automotive power conversion - targeting compact, robust, and easy-to-design DC/DC solutions for ADAS, infotainment, and body electronics where input voltage transients and temperature extremes are routine.
FAQ
What is the maximum input voltage rating for the LM2841YQMKX/NOPB?
The LM2841YQMKX/NOPB has an absolute maximum input voltage rating of 45 V, with recommended operating range from 4.5 V to 42 V. This 42-V upper limit accommodates automotive load-dump transients per ISO 7637-2 Pulse 5a, ensuring reliable operation without external clamping in most vehicle architectures. Exceeding 45 V risks permanent damage.
Does the LM2841YQMKX/NOPB require external compensation components?
No, the LM2841YQMKX/NOPB features an internally compensated current-mode control loop. Unlike many buck controllers, it does not require external Type II or Type III compensation networks - simplifying design, reducing BOM count, and eliminating tuning iterations. This is explicitly confirmed in the datasheet Section 7.3.2 and Typical Application Circuits.
How is soft-start implemented on the LM2841YQMKX/NOPB?
Soft-start on the LM2841YQMKX/NOPB is implemented using the SHDN pin with an external RC network. Applying a ramped voltage to SHDN modulates the cycle-by-cycle current limit from zero to full scale, controlling output voltage rise time and limiting inrush current. The datasheet Figure 6 and Section 8.2.2.7 provide design equations and component guidelines for this function.
What is the purpose of the CB pin on the LM2841YQMKX/NOPB?
The CB pin on the LM2841YQMKX/NOPB provides gate-drive bias voltage for the internal high-side N-channel MOSFET switch. It must be connected to the SW node through a 0.15 µF (minimum) ceramic capacitor. This bootstrap configuration enables efficient high-side switching without requiring a floating supply - a key enabler of the compact SOT-6L solution size.
Is the LM2841YQMKX/NOPB pin-compatible with other LM284x-Q1 variants?
Yes, the LM2841YQMKX/NOPB shares identical pinout, package (SOT-6L), and footprint with LM2840YQMKX/NOPB and LM2842YQMKX/NOPB. All three variants differ only in maximum output current rating (100 mA / 300 mA / 600 mA) and current-limit threshold - allowing hardware reuse across platforms with only minor resistor and inductor value adjustments.
LM2841YQMKX/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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LM2841YQMKX/NOPB FAQ
1.How can I place an order for LM2841YQMKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2841YQMKX/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 LM2841YQMKX/NOPB reliable?
The price and inventory of LM2841YQMKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2841YQMKX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2841YQMKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2841YQMKX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2841YQMKX/NOPB?
LM2841YQMKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2841YQMKX/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 LM2841YQMKX/NOPB?
For technical support, including LM2841YQMKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2841YQMKX/NOPB requirements.
6.How does Aetrix verify that LM2841YQMKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2841YQMKX/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 LM2841YQMKX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2841YQMKX/NOPB?
All LM2841YQMKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2841YQMKX/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 LM2841YQMKX/NOPB part is unused and in its original packaging.
Return procedure for LM2841YQMKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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