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Texas Instruments LM2842YQMKX/NOPB
- Part No.:
- LM2842YQMKX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2842YQMKX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,038
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Product details
Overview
LM2842YQMKX/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, 1.25 MHz fixed switching frequency (Y option), and 4.5 V to 42 V input range-designed for ADAS camera power rails requiring compact, robust, AEC-Q100-compliant conversion.
For engineers reviewing the LM2842YQMKX/NOPB datasheet, LM2842YQMKX/NOPB pinout, LM2842YQMKX/NOPB application, or LM2842YQMKX/NOPB equivalent, this page delivers verified technical context, validated pin functions, real-world application constraints, and confirmed alternative options for automotive embedded power design.
Technical Context
This device implements a current-mode PWM buck architecture with internal 0.9 Ω (typ) high-side MOSFET, gate-drive undervoltage lockout on CB pin, and cycle-by-cycle current limiting modulated via SHDN pin voltage. It operates exclusively in continuous conduction mode at fixed 1.25 MHz (Y variant), enabling small external L/C selection while maintaining low output ripple.
Thermal shutdown engages at 175°C (typ) and releases at 155°C (typ); input UVLO activates at 3.7 V (on) / 3.5 V (off); soft-start is implemented externally using SHDN with RC network to control inrush current ramp rate-not internal programmable soft-start.
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. |
| Output Current | 600 mA max - validated for continuous operation at full load with thermal derating per RθJA = 121°C/W. |
| Switching Frequency | 1.25 MHz (Y option) - enables use of ≤15 µH inductors and ceramic output capacitors < 100 µF without compromising transient response. |
| Feedback Reference | 0.765 V ±1.1% - sets output voltage accuracy via resistor divider; enables 0.8 V to 15 V adjustable outputs with standard E24 resistors. |
| Quiescent Current | 16 µA (shutdown) - ensures minimal battery drain during vehicle sleep modes; rises to 1.35 mA (typ) in active no-load condition. |
| Switch RDS(on) | 0.9 Ω (typ) - contributes to ≥85% typical efficiency at 12 VIN/3.3 VOUT/100 mA; increases to 1.6 Ω over full temperature range. |
| Min. ON/OFF Time | 100 ns / 104 ns - constrains minimum achievable duty cycle and maximum input-to-output voltage ratio at 1.25 MHz operation. |
Pinout & Package
LM2842YQMKX/NOPB uses a 6-pin SOT-6L (DDC) package measuring 1.60 mm × 2.90 mm, optimized for thermal performance and PCB layout simplicity in space-constrained automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap bias supply | Connects external 0.15 µF ceramic capacitor to SW; supplies gate drive voltage for internal high-side FET-must not float or exceed 7 V above SW. |
| GND | Power ground reference | Primary return path for switch current and feedback network; requires low-inductance connection to power plane under IC body. |
| FB | Feedback input | Senses output voltage via resistor divider; 0.1 µA (max) bias current mandates R1+R2 ≤ 10 kΩ to avoid gain error >1%. |
| SHDN | Logic-level enable/disable | Pull ≥2.3 V to enable; ≤0.3 V to disable (16 µA IQ); must never float-tie to VIN if unused; supports analog soft-start via RC ramp. |
| VIN | Main power input | Accepts 4.5–42 V unregulated supply; requires local 2.2 µF X5R/X7R ceramic bypass capacitor placed within 3 mm of pin. |
| SW | Switch node output | Drives external inductor and Schottky diode; high dv/dt node-requires tight loop area with CBOOT, L1, and D1 to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation-enables deployment in engine bay, ADAS ECUs, and lighting control units without derating. |
| Internally compensated control loop | Eliminates need for external compensation network-reduces BOM count and layout sensitivity while maintaining stability across 4.5–42 V input range. |
| Short-circuit protected | Current-limit threshold of 1.15 A (typ) at 25°C-prevents catastrophic failure during output short; limits peak inductor current before thermal shutdown intervenes. |
| Low shutdown IQ | 16 µA typical-meets ISO 16750-2 quiescent current requirements for always-on automotive subsystems. |
| Thermal and UVLO protection | Independent circuits disable switching if junction exceeds 175°C or VIN drops below 3.5 V-prevents erratic behavior during thermal stress or brownout. |
Applications
| Automotive ADAS Camera Power Supply | Automotive Wireless Charging Control Rail |
|---|---|
Use Scenario: Powers image sensor, ISP, and interface circuitry in rear-view or surround-view cameras exposed to wide ambient temperature swings and EMI-rich environments. IC Role / Device Role / Timing Role: Primary 3.3 V or 5 V point-of-load regulator converting 12 V battery to stable low-noise rail; operates continuously during vehicle operation. Use Value: 1.25 MHz switching avoids AM radio band interference; SOT-6L footprint fits behind camera lens housing; AEC-Q100 compliance ensures reliability over 15-year vehicle lifetime. |
Use Scenario: Supplies 5 V or 12 V control logic and communication interface (e.g., CAN FD transceiver) in in-vehicle wireless charging pads. IC Role / Device Role / Timing Role: Secondary regulated rail derived from main 12 V bus; powers microcontroller, coil driver gate logic, and status LEDs. Use Value: 42 V absolute max input withstands load-dump transients; shutdown pin enables synchronized power sequencing with charging controller; 600 mA headroom supports future feature expansion. |
| Automotive Body Control Module (BCM) Lighting Driver Bias | Automotive HVAC Actuator Motor Supply |
Use Scenario: Generates 5 V bias for LED driver ICs controlling adaptive front lighting (AFL) or interior ambient lighting with PWM dimming. IC Role / Device Role / Timing Role: Fixed-output or adjustable buck stage feeding constant-current LED drivers; must reject battery ripple and survive jump-start surges. Use Value: Input range covers 4.5–42 V-handles cold-crank, alternator ripple, and jump-start; low RDS(on) minimizes heat in sealed BCM enclosures. |
Use Scenario: Provides 12 V or 24 V motor supply for stepper or brushed DC actuators in climate control flaps and air mix doors. IC Role / Device Role / Timing Role: Isolated, regulated auxiliary rail decoupled from noisy main motor H-bridge supply; enables precise position sensing and closed-loop control. Use Value: 600 mA output sustains stall current of small actuators; thermal shutdown prevents damage during jammed-flap events; small SOT-6L eases integration near actuator motors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2842XQMKX/NOPB | Same SOT-6L package and pinout; differs only in switching frequency (550 kHz vs 1.25 MHz) and current limit (900 mA vs 1.15 A). | Better suited for higher-efficiency, lower-EMI designs where larger inductors are acceptable; less optimal for ultra-compact layouts. | Select LM2842XQMKX/NOPB when board space allows larger L/C components and lower switching losses are prioritized over size. |
| TPS54332QDDARQ1 | 3 A synchronous buck with integrated high-/low-side FETs; 2.5 V to 28 V input; requires external compensation; larger SOIC-8 package. | Supports higher output currents and tighter regulation but demands more complex layout and external loop tuning. | Choose TPS54332QDDARQ1 only when >600 mA load or synchronous efficiency (>90%) is mandatory-adds cost and complexity. |
Compared with LM2842XQMKX/NOPB, LM2842YQMKX/NOPB trades lower EMI and higher efficiency at light loads for smaller magnetics and reduced solution footprint; versus TPS54332QDDARQ1, it offers plug-and-play simplicity and lower system cost at the expense of peak current capability and regulation precision.
Availability
LM2842YQMKX/NOPB is available at Aetrix Electronics and suitable for automotive ADAS camera power supplies, wireless charging control rails, and body control module lighting drivers requiring stable component supply with AEC-Q100 assurance and long-term production continuity.
Supply support for LM2842YQMKX/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 automotive electronics with broad manufacturing scale and automotive qualification infrastructure.
LM2842YQMKX/NOPB belongs to TI's SIMPLE SWITCHER® automotive DC/DC regulator product line-designed specifically for robust, easy-to-deploy power conversion in harsh-temperature, high-reliability vehicle subsystems without requiring expert power design expertise.
FAQ
What is the maximum output current capability of the LM2842YQMKX/NOPB?
The LM2842YQMKX/NOPB is rated for up to 600 mA DC output current under recommended operating conditions. Its current limit is 1.15 A (typ) at 25°C, decreasing to 1.7 A over −40°C to +125°C ambient. Sustained 600 mA operation requires proper PCB thermal design per RθJA = 121°C/W and adequate copper area under the SOT-6L package to maintain junction temperature below 125°C.
Does the LM2842YQMKX/NOPB support adjustable output voltage?
Yes, the LM2842YQMKX/NOPB supports adjustable output voltage using an external resistor divider on the FB pin. With a precise 0.765 V feedback reference, output voltage is calculated as VOUT = 0.765 V × (1 + R1/R2). Standard values like R2 = 1.02 kΩ and R1 = 5.62 kΩ yield 5 V; R2 = 10 kΩ and R1 = 30.9 kΩ yield 0.8 V-covering 0.8 V to 15 V with appropriate component selection.
What package type and dimensions does the LM2842YQMKX/NOPB use?
The LM2842YQMKX/NOPB uses a 6-pin SOT-6L (DDC) package with nominal body dimensions of 1.60 mm × 2.90 mm and 0.95 mm height. It features gull-wing leads, is RoHS-compliant, and designed for reflow soldering per JEDEC J-STD-020. The package provides adequate thermal dissipation for 600 mA loads when mounted on ≥2 oz copper with thermal vias to inner layers.
How is soft-start implemented on the LM2842YQMKX/NOPB?
Soft-start on the LM2842YQMKX/NOPB is implemented externally using the SHDN pin with an RC network. Applying a slow-rising voltage to SHDN (0–2.3 V) linearly modulates the cycle-by-cycle current limit from zero to full rating, controlling output voltage rise time and inrush current. A typical implementation uses a 100 kΩ resistor and 100 nF capacitor from VIN to SHDN, yielding ~10 ms ramp time-no internal soft-start capacitor is required.
Is the LM2842YQMKX/NOPB pin-compatible with other LM284x-Q1 variants?
Yes, all LM284x-Q1 devices-including LM2840QMKX/NOPB, LM2841QMKX/NOPB, and LM2842YQMKX/NOPB-share identical SOT-6L (DDC) pinout, package dimensions, and pin functions. They differ only in output current rating (100/300/600 mA), switching frequency (550 kHz / 1.25 MHz), and current limit thresholds-enabling drop-in replacement during design iteration or cost optimization without PCB changes.
LM2842YQMKX/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:
- SOT-23-THIN
LM2842YQMKX/NOPB FAQ
1.How can I place an order for LM2842YQMKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2842YQMKX/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 LM2842YQMKX/NOPB reliable?
The price and inventory of LM2842YQMKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2842YQMKX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2842YQMKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2842YQMKX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2842YQMKX/NOPB?
LM2842YQMKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2842YQMKX/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 LM2842YQMKX/NOPB?
For technical support, including LM2842YQMKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2842YQMKX/NOPB requirements.
6.How does Aetrix verify that LM2842YQMKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2842YQMKX/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 LM2842YQMKX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2842YQMKX/NOPB?
All LM2842YQMKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2842YQMKX/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 LM2842YQMKX/NOPB part is unused and in its original packaging.
Return procedure for LM2842YQMKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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