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Texas Instruments LM2842YQMK/NOPB
- Part No.:
- LM2842YQMK/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2842YQMK/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,761
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Product details
Overview
LM2842YQMK/NOPB from Texas Instruments is an automotive-grade, non-synchronous step-down DC/DC regulator in SOT-6L package, delivering up to 600 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, compact, AEC-Q100-compliant power conversion.
For engineers reviewing the LM2842YQMK/NOPB datasheet, LM2842YQMK/NOPB pinout, LM2842YQMK/NOPB application, or LM2842YQMK/NOPB equivalent, key selection criteria include its 600-mA load capability, 1.25-MHz operation for small external components, low 16-µA shutdown current, internal 0.9-Ω MOSFET, and thermal/UVLO protection - all validated for automotive body control and lighting systems.
Technical Context
The LM2842YQMK/NOPB implements a current-mode PWM buck architecture with integrated high-side N-channel MOSFET and gate-drive bias circuitry via CB/SW terminals. Its fixed 1.25-MHz oscillator enables precise duty-cycle control and fast transient response without external compensation.
Functional modes include continuous conduction operation with cycle-by-cycle current limiting, soft-start via SHDN pin RC network, and automatic thermal shutdown at 175°C. Protection features include VIN undervoltage lockout (3.7 V turn-on), gate-drive UVLO, and short-circuit robustness verified across –40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | 600 mA max - supports automotive loads like LED drivers and sensor interfaces without external current boosting. |
| Switching frequency | 1.25 MHz - enables use of sub-10 µH inductors and <100 µF ceramic output capacitors for compact layout. |
| Feedback voltage | 0.765 V - sets output with standard resistor divider; allows precise 3.3 V, 5 V, or 12 V regulation with <1% error. |
| RDS(ON) | 0.9 Ω typical - minimizes conduction loss at full load, enabling >85% efficiency at 12 VIN/3.3 VOUT. |
| Shutdown current | 16 µA typical - reduces system standby power in always-on automotive modules such as infotainment wake-up circuits. |
| Input voltage range | 4.5 V to 42 V - accommodates cold-crank (4.5 V) and load-dump (42 V) transients per ISO 7637-2 without external protection. |
| Junction temp range | –40°C to +125°C - meets AEC-Q100 Grade 1 requirements for under-hood and ADAS camera placement. |
Pinout & Package
SOT-6L (DDC) package: 1.60 mm × 2.90 mm, 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 bias supply | Provides gate-drive voltage for internal high-side MOSFET; 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 minimal trace inductance. |
| 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 achieved when pulled to GND. |
| VIN | Main power input | Accepts 4.5–42 V unregulated supply; includes UVLO (3.7 V turn-on) and ESD protection. |
| SW | Switch node output | Drives external inductor and catch diode; connects to CBOOT, L1, and D1; handles peak currents up to 1.7 A. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use from –40°C to +125°C ambient, including temperature cycling and humidity testing. |
| Internally compensated control loop | Eliminates need for external compensation network - reduces BOM count and design iteration time. |
| Soft-start via SHDN pin | RC network on SHDN enables user-defined startup ramp rate to limit inrush current into output capacitance. |
| Short-circuit and thermal protection | Auto-recovery current limiting and 175°C thermal shutdown prevent damage during fault conditions. |
| Low EMI layout support | Pin arrangement (GND adjacent to SW, FB isolated) minimizes parasitic coupling and simplifies noise-sensitive routing. |
Applications
| Automotive ADAS Camera Power | Automotive Wireless Charging Control |
|---|---|
Use Scenario: Powers image sensor, ISP, and interface circuitry in rear-view or surround-view cameras exposed to engine bay temperatures. IC Role / Device Role / Timing Role: Primary 3.3-V or 5-V buck regulator supplying regulated power to CMOS image sensors and SerDes links. Use Value: Delivers 600 mA at 1.25 MHz with <100 mV ripple, meeting CISPR-25 Class 5 EMI limits while surviving 42-V load dump. | Use Scenario: Supplies auxiliary 5-V rail for MCU, coil driver logic, and communication ICs in in-vehicle wireless charging pads. IC Role / Device Role / Timing Role: Secondary DC/DC stage converting 12-V battery to clean 5-V for digital control subsystems. Use Value: 16-µA shutdown current extends battery life during vehicle sleep mode; AEC-Q100 compliance ensures reliability over 15-year service life. |
| Automotive Body Control Module | Automotive Exterior Lighting Driver |
Use Scenario: Regulates power for door module MCUs, LIN transceivers, and window motor controllers in harsh under-dash environments. IC Role / Device Role / Timing Role: Input-stage buck converter stepping down 12-V battery to 3.3-V logic supply for microcontroller and CAN interface. Use Value: 4.5–42 V input range tolerates cold-crank dips and alternator surges; thermal shutdown prevents latch-up during sustained overloads. | Use Scenario: Provides stable 12-V or 5-V supply to LED driver ICs and current-sense amplifiers in headlamp and tail lamp assemblies. IC Role / Device Role / Timing Role: Constant-voltage source feeding constant-current LED drivers; operates continuously during vehicle operation. Use Value: 0.9-Ω RDS(ON) and 85% typical efficiency minimize thermal rise in sealed lamp housings; SOT-6L footprint fits tight optical module layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2842XQMK/NOPB | Same SOT-6L package and 600-mA rating, but X option uses 550-kHz switching frequency instead of 1.25 MHz. | Better suited for higher-efficiency, lower-EMI designs where larger inductors/capacitors are acceptable. | Select LM2842XQMK/NOPB if board space permits larger magnetics and lower switching losses are prioritized over size. |
| TPS54302QDRCRQ1 | Synchronous buck with 3-A output, 2.5-V to 6-V input, and adjustable frequency (200 kHz–2.5 MHz); no bootstrap requirement. | Requires different external component set and layout; not drop-in compatible due to synchronous rectification and different pinout. | Choose TPS54302QDRCRQ1 only when >600-mA output or higher efficiency at light loads is required - not a direct replacement. |
Compared with LM2842XQMK/NOPB, the LM2842YQMK/NOPB trades higher-frequency operation (1.25 MHz vs. 550 kHz) for smaller passive components and faster transient response, while both share identical thermal performance, protection features, and AEC-Q100 qualification. Against TPS54302QDRCRQ1, it offers simpler design and lower cost for 600-mA applications but lacks synchronous rectification and wide-input flexibility.
Availability
LM2842YQMK/NOPB is available at Aetrix Electronics and suitable for automotive ADAS camera, wireless charging control, and body control module applications requiring stable component supply across extended temperature and lifecycle demands.
Supply support for LM2842YQMK/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 and embedded processing technologies with broad automotive, industrial, and personal electronics portfolios.
The LM284x-Q1 product line delivers SIMPLE SWITCHER® automotive DC/DC regulators targeting space-constrained, high-reliability power conversion in ADAS, body electronics, and infotainment systems - designed for ease of use, minimal external components, and AEC-Q100 compliance.
FAQ
What is the maximum output current supported by the LM2842YQMK/NOPB?
The LM2842YQMK/NOPB supports a maximum continuous DC output current of 600 mA, as specified in the electrical characteristics table under ICL (switch current limit) with typical value of 1.15 A and minimum of 1.15 A at 25°C. This rating is validated across the full –40°C to +125°C junction temperature range and forms the basis for its use in automotive body control and ADAS camera power rails.
Does the LM2842YQMK/NOPB require external compensation components?
No, the LM2842YQMK/NOPB features an internally compensated control loop, eliminating the need for external compensation networks such as RC or capacitor-divider circuits. This simplifies design, reduces bill-of-materials count, and improves stability across operating conditions - a key advantage confirmed in the device's "Features" section and functional block diagram.
How is soft-start implemented on the LM2842YQMK/NOPB?
Soft-start on the LM2842YQMK/NOPB is implemented using an RC network connected to the SHDN pin: applying a controlled voltage ramp to SHDN modulates the cycle-by-cycle current limit from zero to full rating, thereby controlling output voltage rise time and limiting inrush current. The datasheet specifies that SHDN voltage between 0 V and 2.3 V linearly scales the current limit, enabling customizable startup behavior without additional ICs.
What protection features does the LM2842YQMK/NOPB include?
The LM2842YQMK/NOPB integrates thermal shutdown (engages at 175°C, disengages at 155°C), input undervoltage lockout (UVLO turns on at 3.7 V, off at 3.5 V), gate-drive UVLO, short-circuit protection via cycle-by-cycle current limiting, and ESD protection rated to ±2000 V HBM. All protections operate across the full AEC-Q100 Grade 1 temperature range and are detailed in Sections 7.3.1 and 6.1–6.2 of the SNVSBE5 datasheet.
Can the LM2842YQMK/NOPB be used in non-automotive applications?
Yes, the LM2842YQMK/NOPB may be used in industrial or commercial applications where its 4.5–42 V input range, 600-mA output, and 1.25-MHz switching meet system requirements - though its AEC-Q100 qualification, automotive-grade screening, and guaranteed –40°C to +125°C operation provide added margin. TI documents both Q1 (automotive) and non-Q1 versions, but LM2842YQMK/NOPB is the Q1 variant and carries full automotive test documentation.
LM2842YQMK/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:
- 600mA
- 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
LM2842YQMK/NOPB FAQ
1.How can I place an order for LM2842YQMK/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2842YQMK/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 LM2842YQMK/NOPB reliable?
The price and inventory of LM2842YQMK/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2842YQMK/NOPB is usually 5 days.
3.What payment methods are accepted for LM2842YQMK/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2842YQMK/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2842YQMK/NOPB?
LM2842YQMK/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2842YQMK/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 LM2842YQMK/NOPB?
For technical support, including LM2842YQMK/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2842YQMK/NOPB requirements.
6.How does Aetrix verify that LM2842YQMK/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2842YQMK/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 LM2842YQMK/NOPB meets industry standards.
7.What is the process for return or replacement of LM2842YQMK/NOPB?
All LM2842YQMK/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2842YQMK/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 LM2842YQMK/NOPB part is unused and in its original packaging.
Return procedure for LM2842YQMK/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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