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Texas Instruments LM2841YQMK/NOPB
- Part No.:
- LM2841YQMK/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2841YQMK/NOPB.pdf
- Description:
- IC REG BUCK ADJ 300MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:6,520
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Product details
Overview
LM2841YQMK/NOPB from Texas Instruments is an 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 4.5 V to 42 V input range. It powers ADAS camera modules requiring stable 3.3 V rail under wide automotive battery transients.
For engineers reviewing the LM2841YQMK/NOPB datasheet, LM2841YQMK/NOPB pinout, LM2841YQMK/NOPB application, or LM2841YQMK/NOPB equivalent, key selection criteria include AEC-Q100 Grade 1 qualification (–40°C to +125°C), internal 0.9 Ω MOSFET, 16 µA shutdown quiescent current, thermal/UVLO protection, and compatibility with standard ceramic input/output capacitors and Schottky diodes.
Technical Context
The LM2841YQMK/NOPB implements current-mode PWM control with a dedicated error amplifier, bandgap reference, and cycle-by-cycle current limiting. Its functional block includes gate-drive undervoltage lockout for CB/SW bias integrity, soft-start via SHDN pin RC network, and integrated thermal shutdown at 175°C.
It operates in continuous conduction mode with minimum ON-time of 100 ns and maximum duty cycle of 87%, supporting output voltages from 0.8 V to 36 V via external resistor divider on FB pin. Input UVLO activates at 3.7 V (on) and 3.5 V (off), ensuring reliable start-up across cold-crank conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports full automotive battery range including load dump (42 V) and cold-crank (4.5 V) |
| Output Current | Up to 300 mA - sufficient for powering image sensors, microcontrollers, and CAN transceivers in ADAS systems |
| Switching Frequency | 1.25 MHz - enables use of small 10–15 µH inductors and reduces EMI filtering requirements |
| Feedback Reference Voltage | 0.765 V ±1.5% - sets output accuracy and allows precise resistor-divider design for 3.3 V, 5 V, or custom rails |
| Quiescent Current (Shutdown) | 16 µA typical - minimizes battery drain during vehicle sleep mode |
| Internal Switch RDS(ON) | 0.9 Ω typical - delivers >85% efficiency at 12 VIN/3.3 VOUT/100 mA without external MOSFET |
| Operating Junction Temp | –40°C to +125°C - meets AEC-Q100 Grade 1 for under-hood and cabin-mounted electronics |
Pinout & Package
SOT-6L (DDC) package: 1.60 mm × 2.90 mm body size, low-profile surface-mount footprint optimized for automotive PCB space constraints and thermal performance (RθJA = 121°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Provides gate drive voltage for internal high-side switch; requires 0.15 µF ceramic capacitor between CB and SW |
| GND | Power ground reference | Primary return path for switch current and feedback network; must connect directly to power plane with low-inductance trace |
| FB | Feedback input | Senses output voltage via resistor divider; 0.765 V threshold determines VOUT = 0.765 V × (1 + R1/R2) |
| SHDN | Logic-level enable/disable | Pull ≥2.3 V to enable; ≤0.3 V to disable; 16 µA shutdown current; must not float |
| VIN | Main power input | Accepts 4.5–42 V; requires local 2.2 µF ceramic bypass capacitor to suppress high-frequency noise |
| SW | Switch node output | Drives external inductor and Schottky diode; connects to CBOOT; carries pulsed high-current waveform |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation in safety-critical automotive systems |
| Internally compensated control loop | Eliminates need for external compensation components; simplifies layout and reduces BOM count |
| Short-circuit and thermal protection | Auto-recovery current limiting and 175°C thermal shutdown prevent damage during fault conditions |
| Soft-start via SHDN pin | RC network on SHDN enables programmable output ramp time to limit inrush current into downstream capacitance |
| Low EMI SOT-6L layout | Pin arrangement minimizes SW loop area; supports clean 1.25 MHz switching with minimal filtering |
Applications
| Automotive ADAS Camera Module | Automotive Wireless Charging Control Unit |
|---|---|
Use Scenario: Powering 3.3 V image sensor and ISP in forward-facing camera with exposure to engine bay temperature swings and battery transients. IC Role / Device Role / Timing Role: Primary buck regulator generating stable 3.3 V rail from 7–16 V battery supply; regulates during cold-crank (4.5 V) and load-dump (42 V) events. Use Value: 1.25 MHz switching enables compact 15 µH inductor and 22 µF ceramic output capacitor; 0.765 V FB reference ensures ±1.5% output accuracy over temperature. | Use Scenario: Supplying 5 V logic rail for Qi-compliant wireless charging controller IC and associated gate drivers in center console mounting location. IC Role / Device Role / Timing Role: Secondary DC/DC stage stepping down 12 V vehicle bus to regulated 5 V; handles dynamic load steps during coil activation and foreign object detection. Use Value: 300 mA output capability supports peak controller + driver loads; 16 µA shutdown IQ preserves battery during vehicle off-state; thermal shutdown prevents overheating during prolonged charging cycles. |
| Automotive Body Control Module (BCM) | Automotive Interior Lighting Driver |
Use Scenario: Generating 5 V supply for microcontroller, LIN transceiver, and sensor interface in door module exposed to humidity and vibration. IC Role / Device Role / Timing Role: Main system regulator converting unregulated 9–16 V battery to clean 5 V; maintains operation during stop-start engine cycling. Use Value: AEC-Q100 qualification ensures reliability over 15-year vehicle lifetime; UVLO prevents erratic behavior below 3.7 V; internal 0.9 Ω switch eliminates external FET cost and footprint. | Use Scenario: Providing adjustable 8–12 V bias for LED strings in ambient lighting systems with dimming via PWM input. IC Role / Device Role / Timing Role: Constant-voltage buck converter with FB pin configured for 12 V output; supports analog dimming via variable resistor on FB divider. Use Value: 42 V max input withstands load-dump surges; 87% max duty cycle enables 12 V output from 13.5 V nominal battery; soft-start prevents LED flash during ignition-on transition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2841XQMK/NOPB | 550 kHz switching frequency (X option); identical pinout, package, and 300 mA rating | Better efficiency at light loads; larger inductor required; lower EMI but larger solution size | Select when lower switching losses or reduced radiated emissions outweigh board space constraints |
| TPS54332QDDARQ1 | 3 A output, 2.5 V to 28 V input, 1.25 MHz, integrated high/low-side FETs; SOIC-8 package | Higher current capability; synchronous rectification improves efficiency; larger footprint and higher cost | Choose for designs needing >300 mA or synchronous efficiency gains, accepting SOIC-8 layout impact |
Compared with LM2841YQMK/NOPB, the X-option variant trades higher inductor size for improved light-load efficiency, while TPS54332QDDARQ1 offers 10× higher current and synchronous operation at the cost of larger package and BOM complexity-neither is pin-compatible, requiring PCB redesign.
Availability
LM2841YQMK/NOPB is available at Aetrix Electronics and suitable for automotive ADAS camera modules, wireless charging control units, and body control modules requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LM2841YQMK/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-Q1 product line delivers SIMPLE SWITCHER® automotive DC/DC regulators targeting space-constrained, high-reliability power conversion in ADAS, infotainment, and body electronics where wide input range and AEC-Q100 compliance are mandatory.
FAQ
What is the maximum output current supported by the LM2841YQMK/NOPB?
The LM2841YQMK/NOPB supports up to 300 mA DC output current under recommended operating conditions. This rating is validated across the full –40°C to +125°C junction temperature range and accounts for thermal derating in high-ambient environments. The device features cycle-by-cycle current limiting with a typical switch current limit of 525 mA at room temperature, rising to 900 mA at elevated temperatures, ensuring robust overload protection without external sensing components.
Does the LM2841YQMK/NOPB require external compensation components?
No, the LM2841YQMK/NOPB features an internally compensated control loop, eliminating the need for external compensation capacitors or resistors. This simplifies design, reduces bill-of-materials count, and improves layout robustness. The compensation is optimized for stability with standard external components: 10–15 µH inductor, 22–47 µF ceramic output capacitor, and 0.15 µF bootstrap capacitor. TI's WEBENCH® Power Designer validates loop stability for user-defined configurations before prototyping.
How is the output voltage set on the LM2841YQMK/NOPB?
The output voltage of the LM2841YQMK/NOPB is set using a resistor divider connected between VOUT, FB, and GND. With a precise 0.765 V internal feedback reference, VOUT = 0.765 V × (1 + R1/R2). For example, a 3.3 V output uses R2 = 1.02 kΩ and R1 = 3.4 kΩ. Resistors must be selected between 100 Ω and 10 kΩ to minimize bias current errors, and the FB node must be routed away from noisy SW traces to avoid regulation instability.
What protection features does the LM2841YQMK/NOPB include?
The LM2841YQMK/NOPB integrates thermal shutdown (engages at 175°C, releases at 155°C), input undervoltage lockout (UVLO turns on at 3.7 V, off at 3.5 V), gate-drive undervoltage lockout (prevents switching if CB-SW voltage drops below 7 V), and short-circuit current limiting. These protections operate autonomously without external circuitry and are qualified per AEC-Q100 for automotive reliability. No external watchdog or reset IC is needed for basic fault recovery.
Can the LM2841YQMK/NOPB be used in non-automotive applications?
Yes, the LM2841YQMK/NOPB can be used in industrial and commercial applications requiring its electrical specifications (4.5–42 V input, 300 mA output, 1.25 MHz switching), though its AEC-Q100 qualification and screening add cost versus non-automotive variants like LM2841YMK/NOPB. Designers should verify that the extended temperature range, enhanced ESD robustness (±2 kV HBM), and automotive-grade reliability testing provide value for their specific use case-especially in harsh environments or long-lifecycle deployments.
LM2841YQMK/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
LM2841YQMK/NOPB FAQ
1.How can I place an order for LM2841YQMK/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2841YQMK/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 LM2841YQMK/NOPB reliable?
The price and inventory of LM2841YQMK/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2841YQMK/NOPB is usually 5 days.
3.What payment methods are accepted for LM2841YQMK/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2841YQMK/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2841YQMK/NOPB?
LM2841YQMK/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2841YQMK/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 LM2841YQMK/NOPB?
For technical support, including LM2841YQMK/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2841YQMK/NOPB requirements.
6.How does Aetrix verify that LM2841YQMK/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2841YQMK/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 LM2841YQMK/NOPB meets industry standards.
7.What is the process for return or replacement of LM2841YQMK/NOPB?
All LM2841YQMK/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2841YQMK/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 LM2841YQMK/NOPB part is unused and in its original packaging.
Return procedure for LM2841YQMK/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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