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Texas Instruments LM2842XQMK/NOPB
- Part No.:
- LM2842XQMK/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2842XQMK/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,961
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Product details
Overview
LM2842XQMK/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, 550 kHz fixed switching frequency (X option), and 4.5 V to 42 V input range-designed for ADAS camera power rails requiring stable low-noise 3.3 V or 5 V supply.
For engineers reviewing the LM2842XQMK/NOPB datasheet, LM2842XQMK/NOPB pinout, LM2842XQMK/NOPB application, or LM2842XQMK/NOPB equivalent, this page delivers verified pin functions, AEC-Q100 Grade 1 thermal behavior (–40°C to +125°C), soft-start via SHDN pin, internal 0.9 Ω MOSFET switch, and validated alternatives for automotive body control and lighting designs.
Technical Context
The LM2842XQMK/NOPB implements current-mode PWM control with integrated high-side N-channel MOSFET, fixed 550 kHz oscillator, and internal compensation-enabling stable regulation without external loop components. Its UVLO (3.7 V turn-on, 3.5 V turn-off) and gate-drive undervoltage lockout ensure robust startup under automotive battery transients.
Thermal shutdown engages at 175°C (typical) and releases at 155°C (typical); short-circuit protection operates via cycle-by-cycle current limiting, with peak switch current rated at 1.15 A (min) to 1.7 A (max) across temperature. The FB pin bias current is ≤1 µA, supporting precision resistor-divider networks for accurate output voltage setting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to automotive battery (cold-crank down to 4.5 V, load-dump up to 42 V) |
| Max Output Current | 600 mA - sufficient for powering image sensors, CAN transceivers, and LED drivers in ADAS modules |
| Switching Frequency | 550 kHz - enables compact 10–15 µH inductors and low-ESR ceramic output capacitors (e.g., 22–47 µF) |
| Feedback Reference Voltage | 0.765 V ±1.7% - sets output accuracy; allows precise 3.3 V, 5 V, or 12 V regulation using standard 1% resistors |
| Quiescent Current (Shutdown) | 16 µA typical - meets automotive standby power requirements (e.g., always-on camera systems) |
| RDS(ON) | 0.9 Ω typical - minimizes conduction loss at full load, enabling >85% efficiency at 12 VIN/3.3 VOUT |
| Operating Junction Temp | –40°C to +125°C - AEC-Q100 Grade 1 qualified for under-hood and front-end module placement |
Pinout & Package
SOT-6L (DDC) package: 1.60 mm × 2.90 mm, low-profile surface-mount, thermally enhanced with exposed pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CB | Bootstrap capacitor connection | Supplies gate drive voltage for internal high-side FET; requires 0.15 µF ceramic capacitor between CB and SW |
| 2 - GND | Power and signal ground reference | Must be connected to low-impedance PCB ground plane; separate path recommended for FB network return |
| 3 - FB | Feedback input | Senses output voltage via resistor divider; 0.765 V reference enables accurate VOUT = 0.765 × (1 + R1/R2) |
| 4 - SHDN | Logic-level enable/disable control | Pull ≥2.3 V to enable; ≤0.3 V to disable (16 µA IQ); RC network enables programmable soft-start |
| 5 - VIN | Main power input | Accepts 4.5–42 V; requires local 2.2 µF ceramic bypass capacitor placed adjacent to pin |
| 6 - SW | Switch node output | Drives external inductor and Schottky diode; connects to CBOOT; high dv/dt node requiring tight layout |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation network-reduces BOM count and layout sensitivity |
| Soft-start via SHDN pin | RC-controlled ramp limits inrush current; avoids input rail collapse during cold-start in automotive systems |
| Short-circuit protected | Cycle-by-cycle current limiting prevents damage during sustained output shorts or heavy transient loads |
| Thermal shutdown | Auto-recovery at 155°C ensures safe operation under overload or poor heatsinking conditions |
| AEC-Q100 Grade 1 qualified | Validated for –40°C to +125°C ambient operation-meets functional safety requirements for ADAS and body electronics |
Applications
| Automotive ADAS Camera | Automotive Wireless Charging Control |
|---|---|
Use Scenario: Powering 3.3 V image sensor and ISP in forward-facing camera module mounted behind windshield. IC Role / Device Role / Timing Role: Primary buck regulator supplying regulated 3.3 V from 12 V battery; provides clean, low-noise rail with <10 mV ripple. Use Value: Enables reliable startup during cold-crank (4.5 V min), withstands load-dump transients (42 V max), and maintains regulation across –40°C to +125°C junction temp. |
Use Scenario: Generating 5 V supply for microcontroller and coil driver IC in in-cabin wireless charging transmitter. IC Role / Device Role / Timing Role: Secondary DC/DC stage converting 12 V vehicle bus to stable 5 V logic rail with fast transient response. Use Value: 550 kHz switching enables small magnetics; 600 mA capability supports burst-mode controller and gate drivers without derating. |
| Automotive Body Control Module | Automotive Exterior Lighting |
Use Scenario: Supplying 12 V or 5 V to LIN transceivers, door lock actuators, and mirror control ICs in BCM. IC Role / Device Role / Timing Role: High-input-voltage buck converter replacing linear regulators to improve efficiency and reduce thermal load. Use Value: 42 V absolute max rating handles alternator load-dump; shutdown current <20 µA supports low-power sleep modes. |
Use Scenario: Providing 5 V or 3.3 V to LED driver ICs and ambient light sensors in headlamp control units. IC Role / Device Role / Timing Role: Point-of-load regulator for digital subsystems requiring precise voltage and EMI-controlled switching. Use Value: Fixed-frequency operation simplifies EMI filtering; SOT-6L footprint fits constrained headlamp PCB space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2842YQMK/NOPB | 1.25 MHz switching frequency vs. 550 kHz; identical pinout, package, and AEC-Q100 qualification | Better suited for ultra-compact layouts needing smaller inductors/capacitors; higher switching loss reduces efficiency at high load | Select LM2842YQMK/NOPB when board area is critical and thermal margin permits higher fSW losses |
| TPS54340QDDARQ1 | Higher 3.5 A output, adjustable frequency (100 kHz–2.5 MHz), external compensation; SOIC-8 package | Supports higher-power loads (e.g., multi-zone lighting drivers); requires additional loop compensation components | Choose TPS54340QDDARQ1 when >600 mA output or programmable frequency/compensation is required |
Compared with LM2842XQMK/NOPB, the Y-version trades efficiency for size reduction, while TPS54340QDDARQ1 offers scalability at the cost of design complexity and larger footprint-making LM2842XQMK/NOPB optimal for cost-sensitive, space-constrained 600 mA automotive rails.
Availability
LM2842XQMK/NOPB is available at Aetrix Electronics and suitable for automotive ADAS camera systems, wireless charging controllers, and body control modules requiring stable component supply with AEC-Q100 compliance and long-term production support.
Supply support for LM2842XQMK/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 specializing in analog and embedded processing technologies, with leadership in automotive power management and high-reliability IC design.
The LM284x-Q1 product line was developed specifically for automotive power conversion-delivering robust, easy-to-use buck regulators that simplify design of 12 V and 42 V battery-fed subsystems while meeting stringent AEC-Q100 and ISO 16750 requirements.
FAQ
What is the maximum output current supported by the LM2842XQMK/NOPB?
The LM2842XQMK/NOPB is rated for up to 600 mA DC output current under recommended operating conditions. Its switch current limit is specified from 1.15 A (min) to 1.7 A (max) across temperature, enabling reliable operation into short-circuit and transient overloads. Efficiency remains above 85% at 12 VIN/3.3 VOUT with 600 mA load when using optimized external components.
Does the LM2842XQMK/NOPB require external compensation components?
No, the LM2842XQMK/NOPB features internal compensation, eliminating the need for external Type II or Type III compensation networks. This simplifies design, reduces BOM count, and improves layout robustness-especially important in automotive environments where board space and reliability are critical. The device achieves stable regulation with only five external components: input/output capacitors, inductor, diode, and feedback resistors.
How is soft-start implemented on the LM2842XQMK/NOPB?
Soft-start on the LM2842XQMK/NOPB is implemented using the SHDN pin with an external RC network. Applying a controlled voltage ramp to SHDN modulates the cycle-by-cycle current limit-from minimum at 0 V to full rating at 2.3 V-thereby controlling output voltage rise time and limiting inrush current. TI recommends selecting R and C values to ensure SHDN pin current exceeds 1.5 µA at ≥2.3 V to avoid leakage-induced start-up issues.
What is the purpose of the CB pin on the LM2842XQMK/NOPB?
CB (Charge Bootstrap) is the bootstrap capacitor connection pin for the internal high-side MOSFET gate driver. A 0.15 µF ceramic capacitor must be placed between CB and SW to generate the gate drive voltage above VIN required to fully enhance the internal switch. This configuration enables low RDS(ON) (0.9 Ω typical) and high efficiency, especially at higher duty cycles where bootstrapping is essential for proper FET operation.
Is the LM2842XQMK/NOPB compatible with standard SOT-23 footprints?
No, the LM2842XQMK/NOPB uses the SOT-6L (DDC) package, which has six pins in a 1.60 mm × 2.90 mm outline and is not pin-compatible with standard 5-pin or 6-pin SOT-23 variants. Its pinout (CB-GND-FB-SHDN-VIN-SW) differs from common SOT-23 buck regulators, and the thermal pad is not electrically connected but enhances heat dissipation. PCB layout must follow TI's DDC footprint and thermal guidelines in SNVSBE5.
LM2842XQMK/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:
- 550kHz
- 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
LM2842XQMK/NOPB FAQ
1.How can I place an order for LM2842XQMK/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2842XQMK/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 LM2842XQMK/NOPB reliable?
The price and inventory of LM2842XQMK/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2842XQMK/NOPB is usually 5 days.
3.What payment methods are accepted for LM2842XQMK/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2842XQMK/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2842XQMK/NOPB?
LM2842XQMK/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2842XQMK/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 LM2842XQMK/NOPB?
For technical support, including LM2842XQMK/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2842XQMK/NOPB requirements.
6.How does Aetrix verify that LM2842XQMK/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2842XQMK/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 LM2842XQMK/NOPB meets industry standards.
7.What is the process for return or replacement of LM2842XQMK/NOPB?
All LM2842XQMK/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2842XQMK/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 LM2842XQMK/NOPB part is unused and in its original packaging.
Return procedure for LM2842XQMK/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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