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Texas Instruments LM2842XQMKX/NOPB
- Part No.:
- LM2842XQMKX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2842XQMKX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,840
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Product details
Overview
LM2842XQMKX/NOPB from Texas Instruments is an AEC-Q100 Grade 1 automotive buck DC/DC regulator delivering up to 600 mA output current, operating from 4.5 V to 42 V input, with 550-kHz fixed switching frequency, 0.765-V feedback reference voltage, and internal 0.9-Ω power MOSFET - used in ADAS camera power rails and body control modules.
For engineers reviewing the LM2842XQMKX/NOPB datasheet, LM2842XQMKX/NOPB pinout, LM2842XQMKX/NOPB application, or LM2842XQMKX/NOPB equivalent, key selection criteria include automotive-grade thermal robustness (–40°C to +125°C), low shutdown IQ (16 µA), short-circuit protection, and SOT-6L package compatibility with space-constrained PCB layouts.
Technical Context
This non-synchronous PWM buck regulator uses current-mode control with integrated high-side switch and dedicated gate-drive bias (CB pin) for stable operation across wide input transients. Its internal compensation eliminates external compensation networks, while UVLO (3.7 V turn-on), thermal shutdown (175°C trip), and gate-drive undervoltage lockout ensure fault resilience in automotive environments.
The device implements soft-start via SHDN pin voltage ramping, enabling user-defined inrush current limiting through external RC networks. Minimum on-time (100 ns) and off-time (110 ns) support high step-down ratios at 550 kHz, and the 0.765-V FB reference enables precise output regulation down to 0.8 V using standard resistor dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to automotive battery rail including cold-crank (4.5 V) and load-dump (42 V) conditions. |
| Max Output Current | 600 mA - rated continuous DC load capability per LM2842-Q1 variant; validated across –40°C to +125°C junction temperature. |
| Switching Frequency | 550 kHz - fixed frequency enables predictable EMI filtering and compact external component sizing (e.g., 15 µH inductor). |
| Feedback Reference | 0.765 V ±1.7% - sets output voltage accuracy; allows 0.8 V to 15 V programmable outputs using standard resistor tolerances. |
| Quiescent Current | 16 µA typical in shutdown - minimizes battery drain during vehicle sleep modes without requiring external enable sequencing. |
| Power Switch RDS(on) | 0.9 Ω typical - enables >85% typical efficiency at 12 VIN/3.3 VOUT/100 mA, reducing thermal load in sealed enclosures. |
| Thermal Shutdown | 175°C trip / 155°C release - protects against sustained overload or poor heatsinking in under-hood applications. |
Pinout & Package
SOT-6L (DDC) package: 1.60 mm × 2.90 mm footprint, low-profile surface-mount design optimized for automotive PCB space constraints and thermal performance (RθJA = 121°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CB | Bootstrap capacitor bias | Provides gate drive voltage for internal high-side FET; requires 0.15 µF ceramic capacitor between CB and SW pins. |
| 2 - GND | Power ground reference | Primary return path for switch current and feedback network; must connect directly to power plane with minimal trace inductance. |
| 3 - FB | Feedback voltage sense | Monitors output divider ratio; 0.765-V reference enables precision regulation; resistors must be 100 Ω–10 kΩ to limit bias error. |
| 4 - SHDN | Logic-level enable/disable | Pull ≥2.3 V to enable; ≤0.3 V to enter 16-µA shutdown; tie to VIN if unused - floating prohibited. |
| 5 - VIN | Main power input | Accepts 4.5–42 V; includes UVLO (3.7 V turn-on) and internal surge protection; requires local 2.2 µF ceramic bypass. |
| 6 - SW | Switch node output | Drives external inductor and catch diode; connects to CBOOT; high dv/dt node requiring tight layout to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation in automotive safety-critical systems including ADAS and lighting. |
| Internally compensated control loop | Eliminates need for external compensation components - reduces BOM count and layout sensitivity in production designs. |
| Short-circuit and thermal protection | Auto-recovery cycle-by-cycle current limiting plus thermal shutdown prevents damage during output faults or airflow loss. |
| Soft-start via SHDN pin | RC-controlled voltage ramp on SHDN modulates current limit from zero to full scale, eliminating output overshoot and inrush stress. |
| Low shutdown quiescent current | 16 µA max ensures <1 µA system-level battery drain in vehicle sleep states - critical for 10-year automotive lifecycle compliance. |
Applications
| Automotive ADAS Camera Power | Automotive Wireless Charging Control |
|---|---|
|
Use Scenario: Powers image sensor and ISP 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 point-of-load regulator converting raw battery voltage with transient immunity. Use Value: Maintains regulated output during cold-crank (4.5 V) and load-dump (42 V) events without brownout or reset. |
Use Scenario: Supplies 5-V logic and gate drivers for Qi-compliant wireless charging transmitter modules. IC Role / Device Role / Timing Role: Secondary buck stage isolating MCU and power stage from noisy battery rail. Use Value: Delivers clean, ripple-free 5 V at up to 600 mA while rejecting conducted noise from power amplifier switching. |
| Automotive Body Control Module | Automotive LED Headlamp Driver Bias |
|
Use Scenario: Generates 5-V or 12-V auxiliary rails for door module microcontrollers and CAN transceivers. IC Role / Device Role / Timing Role: High-efficiency, thermally robust DC/DC converter supporting long-duration park mode operation. Use Value: Achieves >85% efficiency at 12 VIN/5 VOUT/300 mA, minimizing heat buildup in sealed plastic housings. |
Use Scenario: Provides stable 8-V or 15-V bias supply for LED driver ICs in adaptive front-lighting systems (AFS). IC Role / Device Role / Timing Role: Precision-adjustable buck regulator setting LED string current reference voltage. Use Value: Enables accurate 0.765-V FB-based output programming from 0.8 V to 15 V - supporting multiple LED configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2842YQMKX/NOPB | 1.25-MHz switching frequency vs. 550 kHz; identical pinout, package, and electrical specs except fSW. | Better suited for ultra-compact layouts requiring smaller inductors/capacitors; higher switching losses at high load currents. | Select LM2842YQMKX/NOPB when board area is constrained and thermal headroom permits higher fSW losses. |
| TPS54202HQRTERQ1 | Synchronous buck architecture; 4.5–28-V input; 2-A output; integrated high/low-side FETs; 2.5-V minimum output. | Higher current capability and efficiency, but lacks 42-V input rating and AEC-Q100 Grade 1 extended temperature validation. | Choose TPS54202HQRTERQ1 only for non-critical 28-V max systems where 2-A output and synchronous efficiency outweigh 42-V requirement. |
Compared with LM2842YQMKX/NOPB, the LM2842XQMKX/NOPB offers lower EMI and higher efficiency at medium loads due to its 550-kHz frequency, while TPS54202HQRTERQ1 provides greater current headroom but sacrifices automotive-grade 42-V input tolerance and extended temperature certification.
Availability
LM2842XQMKX/NOPB is available at Aetrix Electronics and suitable for automotive ADAS camera power supplies, wireless charging control modules, and body control unit auxiliary rails requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for LM2842XQMKX/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 leader specializing in analog, embedded processing, and automotive-grade power management ICs with over 40 years of automotive qualification experience.
The LM284x-Q1 product line delivers SIMPLE SWITCHER® automotive buck regulators optimized for reliability, ease-of-use, and AEC-Q100 compliance in harsh-temperature vehicle subsystems.
FAQ
What is the maximum input voltage rating for LM2842XQMKX/NOPB?
The LM2842XQMKX/NOPB has an absolute maximum input voltage rating of 45 V and a recommended operating range of 4.5 V to 42 V. This 42-V upper limit accommodates automotive load-dump transients per ISO 7637-2, making LM2842XQMKX/NOPB suitable for direct battery connection in passenger and commercial vehicles without external clamping circuitry.
Does LM2842XQMKX/NOPB require external compensation components?
No, LM2842XQMKX/NOPB features internally compensated current-mode control, eliminating the need for external compensation capacitors or resistors. This simplifies design, reduces BOM cost, and improves layout robustness - confirmed in TI's SNVSBE5 datasheet Section 7.3.2 and Typical Application Circuit diagrams.
How is soft-start implemented on LM2842XQMKX/NOPB?
Soft-start on LM2842XQMKX/NOPB is implemented by applying a controlled voltage ramp to the SHDN pin using an external RC network. As SHDN voltage rises from 0 V to 2.3 V, the device modulates cycle-by-cycle current limit from zero to full scale, preventing output overshoot and inrush current - detailed in Section 8.2.2.7 of the LM2842XQMKX/NOPB datasheet.
What package type and dimensions does LM2842XQMKX/NOPB use?
LM2842XQMKX/NOPB uses the SOT-6L (DDC) package with nominal body dimensions of 1.60 mm × 2.90 mm and 0.95-mm height. This RoHS-compliant, lead-free package is specified in TI's SNVSBE5 datasheet Section 12 and supports automated SMT assembly with standard reflow profiles.
Is LM2842XQMKX/NOPB qualified for automotive safety applications?
Yes, LM2842XQMKX/NOPB is AEC-Q100 Grade 1 qualified (–40°C to +125°C ambient), with built-in protections including thermal shutdown (175°C trip), input UVLO (3.7 V turn-on), gate-drive UVLO, and short-circuit current limiting - all documented in the SNVSBE5 production datasheet for automotive ADAS, body electronics, and lighting systems.
LM2842XQMKX/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:
- SOT-23-THIN
LM2842XQMKX/NOPB FAQ
1.How can I place an order for LM2842XQMKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2842XQMKX/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 LM2842XQMKX/NOPB reliable?
The price and inventory of LM2842XQMKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2842XQMKX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2842XQMKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2842XQMKX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2842XQMKX/NOPB?
LM2842XQMKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2842XQMKX/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 LM2842XQMKX/NOPB?
For technical support, including LM2842XQMKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2842XQMKX/NOPB requirements.
6.How does Aetrix verify that LM2842XQMKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2842XQMKX/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 LM2842XQMKX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2842XQMKX/NOPB?
All LM2842XQMKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2842XQMKX/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 LM2842XQMKX/NOPB part is unused and in its original packaging.
Return procedure for LM2842XQMKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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