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Texas Instruments LM2842YQMK-M3
- Part No.:
- LM2842YQMK-M3
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2842YQMK-M3.pdf
- Description:
- IC REG BUCK ADJ 600MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,688
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Product details
Overview
LM2842YQMK-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 0.765 V feedback reference voltage, 1.25 MHz fixed switching frequency (Y option), and 4.5 V to 42 V input range-used in industrial distributed power and battery-powered equipment requiring compact, efficient voltage conversion.
For engineers reviewing the LM2842YQMK-M3 datasheet, LM2842YQMK-M3 pinout, LM2842YQMK-M3 application, or LM2842YQMK-M3 equivalent, key selection criteria include its 1.25 MHz operation enabling small external components, integrated soft-start via SHDN pin, thermal shutdown protection, low 16 µA shutdown IQ, and internal 0.9 Ω MOSFET switch for high efficiency in space-constrained designs.
Technical Context
The LM2842YQMK-M3 implements current-mode PWM control with cycle-by-cycle current limiting and internal compensation. Its functional block includes an error amplifier referenced to 0.765 V, gate driver with CB/SW bootstrap architecture, UVLO (3.7 V turn-on), thermal shutdown (175°C trip), and SHDN-controlled soft-start modulation.
It operates in continuous conduction mode with minimum ON-time of 100 ns and maximum duty cycle of 87% at 1.25 MHz. The device uses external diode rectification and requires no external compensation network due to internally compensated loop response optimized for stability with standard ceramic output capacitors.
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 |
| Output Current | Up to 600 mA - enables direct powering of microcontrollers, sensors, and interface ICs in embedded systems |
| Switching Frequency | 1.25 MHz (Y option) - allows use of sub-10 µH inductors and compact 0402/0603 MLCCs for minimal board area |
| Feedback Reference | 0.765 V - sets precise output voltage via resistor divider; enables 0.8 V to 36 V adjustable outputs |
| Shutdown Quiescent Current | 16 µA typical - extends battery life in always-on or low-power wake-up applications |
| Internal Switch RDS(on) | 0.9 Ω typical - delivers >85% typical efficiency at mid-load with minimal thermal derating in SOT-6L |
| Thermal Shutdown Threshold | 175°C typical - protects against sustained overload or poor PCB thermal design without external circuitry |
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 bias supply | Connects external 0.15 µF ceramic capacitor to SW; provides gate drive voltage for internal N-channel MOSFET |
| 2: GND | Power and signal ground | Primary return path for switch current, feedback, and shutdown logic; must be low-impedance connection to PCB ground plane |
| 3: FB | Feedback input | Senses output voltage via resistor divider; regulates VOUT = 0.765 V × (1 + R1/R2); bias current <1 µA minimizes divider error |
| 4: SHDN | Logic-level enable/disable | Pull ≥2.3 V to enable; ≤0.3 V to disable; 16 µA shutdown IQ achieved; must not float - tie to VIN if unused |
| 5: VIN | Main power input | Accepts 4.5–42 V; supplies internal LDO, gate driver, and control circuitry; requires local 2.2 µF X5R/X7R ceramic bypass |
| 6: SW | Switch node output | Drives external inductor and Schottky diode; connects to CBOOT capacitor; carries high di/dt pulsed current - needs short, wide trace |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated loop | Eliminates need for external compensation components - reduces BOM count and layout sensitivity |
| Soft-start via SHDN pin | RC-controlled ramp of current limit enables tailored start-up dV/dt and inrush control without extra IC |
| Short-circuit protected | Cycle-by-cycle current limiting prevents damage during output fault; recovery automatic after fault removal |
| Low-RDS(on) internal switch | 0.9 Ω typical RDS(on) minimizes conduction loss and thermal rise in SOT-6L, supporting 600 mA continuously |
| UVLO with hysteresis | Turn-on at 3.7 V ±0.35 V, turn-off at 3.5 V - prevents erratic operation during brown-out or cold cranking |
Applications
| Industrial Sensor Node | Portable Medical Monitor |
|---|---|
|
Use Scenario: Powering ultra-low-power MCU, analog front-end, and BLE radio from a 12–36 V industrial bus or LiFePO₄ battery pack. IC Role / Device Role / Timing Role: Primary buck regulator generating stable 3.3 V rail; handles wide input transients and load steps without dropout. Use Value: 1.25 MHz operation enables 4.7 µH inductor and 22 µF ceramic output cap - achieving <10 mm² solution size while maintaining >87% efficiency at 300 mA. |
Use Scenario: Converting 7.4 V dual-cell Li-ion to regulated 5 V for display backlight and USB charging circuitry in handheld diagnostic devices. IC Role / Device Role / Timing Role: High-efficiency step-down converter with shutdown control synchronized to device sleep mode. Use Value: 16 µA shutdown IQ preserves battery charge during 24-hour standby; thermal shutdown prevents overheating in sealed enclosure. |
| Automotive Body Control Module | Ruggedized IoT Gateway |
|
Use Scenario: Supplying 5 V to CAN transceiver and microcontroller in under-hood ECUs exposed to 40 V load dump and −40°C ambient. IC Role / Device Role / Timing Role: Input-conditioning regulator tolerant of automotive transients; interfaces with external TVS and reverse-polarity protection. Use Value: 42 V absolute max input rating and internal UVLO ensure reliable startup after cold crank; 0.9 Ω RDS(on) sustains 600 mA at 125°C junction temperature. |
Use Scenario: Providing 3.3 V to LoRaWAN modem, environmental sensor array, and secure element in outdoor edge-node enclosures. IC Role / Device Role / Timing Role: Primary DC/DC stage converting 12–24 V PoE or solar input to low-noise digital rail. Use Value: Internally compensated design eliminates tuning effort; SOT-6L footprint allows placement near noisy switching loads with minimal EMI coupling. |
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-M3 | Same silicon, X option: 550 kHz switching frequency instead of 1.25 MHz | Requires larger inductor (≥10 µH) and higher-value output capacitor for same ripple performance | Select when lower EMI or higher efficiency at light load is prioritized over board area |
| TPS54202DRCT | Synchronous buck, 4.5–28 V input, 2 A output, 500 kHz–2.5 MHz adjustable frequency, integrated high/low-side FETs | Higher current capability and synchronous rectification improve light-load efficiency but require external compensation | Choose when >600 mA output or >90% light-load efficiency is required; adds complexity and cost |
Compared with LM2842YQMK-M3, the X-option variant trades switching speed for lower EMI and relaxed component sizing, while TPS54202DRCT offers higher current and synchronous efficiency at the cost of design complexity and larger solution size - making LM2842YQMK-M3 optimal for cost-sensitive, space-constrained 600 mA applications needing simplicity and proven reliability.
Availability
LM2842YQMK-M3 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, automotive body control modules, and ruggedized IoT gateways requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LM2842YQMK-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, designing and manufacturing analog, embedded processing, and connectivity products for industrial, automotive, and personal electronics markets.
The LM2842YQMK-M3 belongs to TI's SIMPLE SWITCHER® family of easy-to-use DC/DC regulators, engineered specifically for designers needing robust, low-component-count buck solutions without compensation expertise or layout iteration.
FAQ
What is the maximum output current capability of the LM2842YQMK-M3?
The LM2842YQMK-M3 is rated for up to 600 mA DC output current under recommended operating conditions. Its current limit is specified at 1.15 A typical (1.7 A max) across −40°C to 125°C, enabling robust transient handling. Actual deliverable current depends on input voltage, ambient temperature, PCB thermal design, and inductor saturation rating - with full 600 mA sustained at 125°C junction temperature when using proper copper area and airflow.
Does the LM2842YQMK-M3 require external compensation components?
No, the LM2842YQMK-M3 features an internally compensated control loop. This eliminates the need for external compensation networks such as type-II or type-III compensators, reducing BOM count and layout sensitivity. The internal compensation is optimized for stability with standard ceramic output capacitors (22–100 µF, ESR < 0.1 Ω), simplifying design for first-pass success in space-constrained applications.
How is soft-start implemented on the LM2842YQMK-M3?
Soft-start on the LM2842YQMK-M3 is implemented using the SHDN pin in conjunction with an external RC network. Applying a controlled voltage ramp to SHDN modulates the cycle-by-cycle current limit from zero up to full rating, thereby controlling output voltage rise time and limiting inrush current. A typical implementation uses a resistor (e.g., 100 kΩ) and capacitor (e.g., 100 nF) from SHDN to GND, with VIN applied through the resistor - producing ~10 ms soft-start time.
What is the purpose of the CB pin on the LM2842YQMK-M3?
The CB (Charge Bootstrap) pin on the LM2842YQMK-M3 supplies gate drive voltage to the internal high-side N-channel MOSFET switch. It must be connected to a 0.15 µF or larger ceramic capacitor between CB and SW pins. This bootstrap capacitor charges during the low-side conduction phase and provides the elevated voltage needed to fully enhance the high-side switch, ensuring low RDS(on) and high efficiency - especially critical at low duty cycles or high input voltages.
Can the LM2842YQMK-M3 operate with input voltages below 4.5 V?
No, the LM2842YQMK-M3 has a guaranteed minimum operating input voltage of 4.5 V per its Recommended Operating Conditions. Below this threshold, the internal UVLO circuit disables switching to prevent unstable regulation or excessive dropout. The absolute maximum rating allows −0.3 V, but functional operation is not assured below 4.5 V. For sub-4.5 V inputs, alternative regulators such as the TPS62840 (1.8–6.5 V input) should be evaluated.
LM2842YQMK-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:
- 1.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LM2842YQMK-M3 FAQ
1.How can I place an order for LM2842YQMK-M3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2842YQMK-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 LM2842YQMK-M3 reliable?
The price and inventory of LM2842YQMK-M3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2842YQMK-M3 is usually 5 days.
3.What payment methods are accepted for LM2842YQMK-M3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2842YQMK-M3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2842YQMK-M3?
LM2842YQMK-M3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2842YQMK-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 LM2842YQMK-M3?
For technical support, including LM2842YQMK-M3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2842YQMK-M3 requirements.
6.How does Aetrix verify that LM2842YQMK-M3 is sourced from the original manufacturer or authorized distributors?
All LM2842YQMK-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 LM2842YQMK-M3 meets industry standards.
7.What is the process for return or replacement of LM2842YQMK-M3?
All LM2842YQMK-M3 units undergo pre-shipment inspection (PSI). If there is an issue with LM2842YQMK-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 LM2842YQMK-M3 part is unused and in its original packaging.
Return procedure for LM2842YQMK-M3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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