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Texas Instruments LM2842XQMK-M3
- Part No.:
- LM2842XQMK-M3
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2842XQMK-M3.pdf
- Description:
- IC REG BUCK ADJ 600MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,692
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Product details
Overview
LM2842XQMK-M3 from Texas Instruments is a non-synchronous step-down DC/DC regulator in SOT-6L package, delivering up to 600 mA output current with 4.5 V to 42 V input range, 0.765 V feedback reference, and fixed 550 kHz switching frequency. It integrates a 0.9 Ω typical RDS(ON) power switch and supports adjustable output voltage via external resistor divider for industrial distributed power and battery-powered equipment.
For engineers reviewing the LM2842XQMK-M3 datasheet, LM2842XQMK-M3 pinout, LM2842XQMK-M3 application, or LM2842XQMK-M3 equivalent, key selection criteria include its 600-mA load capability, thermal shutdown protection, low 16-µA shutdown quiescent current, internal compensation, and compatibility with standard ceramic input/output capacitors and Schottky diodes in compact SOT-6L layouts.
Technical Context
The LM2842XQMK-M3 implements current-mode PWM control with fixed-frequency operation at 550 kHz (X option), enabling predictable ripple and simplified EMI filtering. Its internal N-channel MOSFET features 0.9 Ω typical RDS(ON), supporting high efficiency (85% typical) across 4.5–42 V input while maintaining stable regulation under line and load transients.
Protection architecture includes VIN undervoltage lockout (3.7 V turn-on), thermal shutdown (175°C trip), gate-drive undervoltage lockout, and cycle-by-cycle current limiting (1.15 A typical). Soft-start is implemented via SHDN pin voltage ramping, allowing user-defined start-up slew rate using an external RC network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide-input industrial and automotive battery systems without pre-regulation |
| Max Output Current | 600 mA - rated continuous DC load capacity per LM2842 family specification |
| Feedback Reference Voltage | 0.765 V ±1.5% - sets output voltage accuracy via external resistor divider (VOUT = 0.765 × (1 + R1/R2)) |
| Switching Frequency | 550 kHz - enables use of small 10–22 µH inductors and low-ESR ceramic capacitors |
| RDS(ON) | 0.9 Ω typical - minimizes conduction loss and improves full-load efficiency |
| Shutdown Quiescent Current | 16 µA typical - preserves battery life in standby mode for portable applications |
| Current Limit Threshold | 1.15 A typical - provides robust short-circuit protection without external sensing |
Pinout & Package
SOT-6L (DDC) package, 1.60 mm × 2.90 mm body size, thermally enhanced for surface-mount PCB assembly with exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap bias supply | Connects CBOOT capacitor between CB and SW to generate gate drive voltage for internal high-side switch |
| GND | Power and signal ground | Common return path for VIN, SW, FB, SHDN, and CB; must be low-impedance for stability and EMI control |
| FB | Feedback input | Monitors output voltage via resistor divider; regulates VOUT to maintain 0.765 V at this pin |
| SHDN | Logic-level enable/disable | Pull ≥2.3 V to enable; ≤0.3 V to disable; ties to VIN if unused; drives soft-start via analog voltage ramp |
| VIN | Main power input | Accepts 4.5–42 V DC; requires local 2.2–10 µF ceramic bypass capacitor to suppress input transients |
| SW | Switch node output | Drives external inductor and Schottky diode; connects to CBOOT; carries high di/dt switching current |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation network - reduces BOM count and layout sensitivity |
| Thermal shutdown | Auto-recovery at 155°C (typical) after trip at 175°C - prevents permanent damage during overload or poor heatsinking |
| Soft-start via SHDN | Enables user-defined output voltage ramp rate using external RC on SHDN pin - limits inrush current and stress on input caps |
| Low-RDS(ON) switch | 0.9 Ω typical RDS(ON) - delivers >85% typical efficiency at 12 VIN/3.3 VOUT/600 mA without external FET |
| Fixed 550-kHz frequency | Stable timing without external oscillator components - simplifies design and improves noise predictability |
Applications
| Industrial Distributed Power | Battery-Powered Equipment |
|---|---|
|
Use Scenario: Power conversion from 24-V or 36-V industrial bus rails to 3.3-V or 5-V logic supplies in PLC I/O modules and sensor nodes. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated low-noise DC output with built-in current limiting and thermal protection. Use Value: Eliminates need for external current sense or compensation components; operates reliably across –40°C to +125°C junction temperature range. |
Use Scenario: Step-down conversion from single-cell Li-ion (4.2 V) or multi-cell alkaline (up to 42 V) batteries to 3.3-V microcontroller or RF module supplies. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter enabling extended runtime and low quiescent current in sleep mode. Use Value: 16-µA shutdown IQ preserves battery charge; wide input range avoids brownouts during battery discharge. |
| Portable Hand-Held Instruments | Automotive Aftermarket Electronics |
|
Use Scenario: Compact power supply for handheld test meters, data loggers, or portable medical devices requiring stable 3.3-V or 5-V rails from variable battery sources. IC Role / Device Role / Timing Role: Integrated buck regulator with minimal external parts - fits tight board space constraints in handheld enclosures. Use Value: SOT-6L footprint (1.6 × 2.9 mm) and internal compensation reduce solution size vs discrete or controller-based alternatives. |
Use Scenario: Power management in automotive infotainment accessories, OBD-II adapters, or dashcams operating from 9–16 V vehicle battery with load dump tolerance up to 42 V. IC Role / Device Role / Timing Role: Input-robust buck converter handling cold-crank (≥4.5 V) and load-dump (≤42 V) conditions without external protection. Use Value: Built-in UVLO (3.7 V turn-on) and overvoltage clamping protect downstream circuitry during automotive transients. |
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-M3 | 1.25 MHz switching frequency vs 550 kHz; identical 600 mA rating, same SOT-6L package and pinout | Better suited for ultra-compact designs requiring smaller inductors/capacitors; higher switching loss at high load | Select LM2842YQMK-M3 when board area is constrained and efficiency at light loads is prioritized over full-load thermal performance |
| TPS54202DRCT | Synchronous buck with 4.5–28 V input, 2-A output, 500 kHz–2.5 MHz programmable frequency, integrated high/low-side FETs | Higher current capability and synchronous rectification improve efficiency above 300 mA; requires external compensation | Choose TPS54202DRCT for designs needing >600 mA or improved light-load efficiency via Eco-mode; adds design complexity |
Compared with LM2842XQMK-M3, the Y-version offers higher frequency for smaller passives but lower peak efficiency, while TPS54202DRCT delivers higher current and synchronous operation at the cost of added external components and layout sensitivity.
Availability
LM2842XQMK-M3 is available at Aetrix Electronics and suitable for industrial distributed power, battery-powered equipment, and portable hand-held instruments requiring stable component supply with automotive-grade reliability and long-term lifecycle support.
Supply support for LM2842XQMK-M3 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 power management ICs with broad industrial, automotive, and consumer market reach.
The LM2842XQMK-M3 belongs to TI's SIMPLE SWITCHER® family of easy-to-use DC/DC regulators, designed specifically for engineers seeking robust, low-component-count buck solutions for wide-input industrial and battery-powered systems.
FAQ
What is the maximum output current supported by the LM2842XQMK-M3?
The LM2842XQMK-M3 is rated for up to 600 mA of continuous DC output current, as confirmed in the Electrical Characteristics table (ICL = 1.15 A typical switch current limit). This rating applies across the full operating junction temperature range of –40°C to +125°C and is validated with appropriate thermal layout and external component selection per TI's recommended design guidelines.
Does the LM2842XQMK-M3 require external compensation components?
No, the LM2842XQMK-M3 is internally compensated, eliminating the need for external compensation networks. This is explicitly stated in the Features section and verified in the Functional Block Diagram and Application and Implementation sections of the datasheet. The internal compensation ensures stable operation with standard ceramic input/output capacitors and common inductor values without tuning.
What is the function of the CB pin on the LM2842XQMK-M3?
The CB (Charge Bootstrap) pin on the LM2842XQMK-M3 provides gate drive bias for the internal high-side N-channel MOSFET. It must be connected to the SW pin through a 0.15 µF or larger ceramic capacitor (CBOOT) to generate the required gate-source voltage. This bootstrap configuration enables efficient high-side switching without requiring a dedicated floating supply or external driver.
Can the LM2842XQMK-M3 be used with input voltages below 4.5 V?
No - the LM2842XQMK-M3 has a specified minimum input voltage of 4.5 V per Recommended Operating Conditions. Below this threshold, the device enters undervoltage lockout (UVLO) and ceases switching. The UVLO turn-on threshold is 3.7 V (typical), but reliable regulation only begins above 4.5 V, and operation below that level is not guaranteed or characterized.
How does the SHDN pin implement soft-start in the LM2842XQMK-M3?
The SHDN pin on the LM2842XQMK-M3 enables analog soft-start: applying a controlled voltage ramp (0–2.3 V) to SHDN modulates the cycle-by-cycle current limit from zero to full rating, thereby controlling output voltage rise time and limiting inrush current. This is distinct from digital enable/disable and requires an external RC network tied to SHDN per Figure 6 and Section 8.2.2.7 of the datasheet.
LM2842XQMK-M3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Bulk
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LM2842XQMK-M3 FAQ
1.How can I place an order for LM2842XQMK-M3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2842XQMK-M3 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-M3 reliable?
The price and inventory of LM2842XQMK-M3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2842XQMK-M3 is usually 5 days.
3.What payment methods are accepted for LM2842XQMK-M3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2842XQMK-M3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2842XQMK-M3?
LM2842XQMK-M3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2842XQMK-M3 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-M3?
For technical support, including LM2842XQMK-M3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2842XQMK-M3 requirements.
6.How does Aetrix verify that LM2842XQMK-M3 is sourced from the original manufacturer or authorized distributors?
All LM2842XQMK-M3 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-M3 meets industry standards.
7.What is the process for return or replacement of LM2842XQMK-M3?
All LM2842XQMK-M3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2842XQMK-M3, 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-M3 part is unused and in its original packaging.
Return procedure for LM2842XQMK-M3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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