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Texas Instruments LM2842XMK-ADJL/NOPB
- Part No.:
- LM2842XMK-ADJL/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2842XMK-ADJL/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,615
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Product details
Overview
LM2842XMK-ADJL/NOPB 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, 550-kHz fixed switching frequency, and 4.5-V to 42-V input range. It integrates a 0.9-Ω typical RDS(ON) power switch and supports adjustable output voltage via external resistor divider - used in industrial distributed power and battery-powered instrumentation.
For engineers reviewing the LM2842XMK-ADJL/NOPB datasheet, LM2842XMK-ADJL/NOPB pinout, LM2842XMK-ADJL/NOPB application, or LM2842XMK-ADJL/NOPB equivalent, key selection criteria include verified 600-mA load capability, confirmed 550-kHz switching frequency (X variant), validated thermal shutdown and UVLO protection, and SOT-6L layout compatibility for space-constrained PCBs.
Technical Context
The LM2842XMK-ADJL/NOPB implements current-mode PWM control with internal compensation, enabling stable regulation without external loop components. Its functional block includes an error amplifier referenced to 0.765 V, dedicated gate-drive undervoltage lockout on the CB pin, and cycle-by-cycle current limiting modulated via SHDN pin voltage.
It operates in continuous conduction mode with minimum ON-time of 100 ns and maximum duty cycle of 94%, supporting wide VIN-to-VOUT ratios. Protection features include thermal shutdown at 175°C (typ), input UVLO with 3.7-V turn-on threshold, and short-circuit robustness via current-limit foldback.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports unregulated industrial rails and wide-range battery inputs (e.g., 12–36 V nominal systems). |
| Output Current | Up to 600 mA - validated for sustained operation under full load at 125°C junction temperature. |
| Feedback Reference | 0.765 V ±1.7% - enables precise output setting (e.g., 3.3 V with 1.02 kΩ/3.4 kΩ divider) with low bias current (0.1 µA typ). |
| Switching Frequency | 550 kHz - balances efficiency and component size; allows use of compact 10–22 µH inductors and ceramic capacitors. |
| RDS(ON) | 0.9 Ω (typ) - minimizes conduction loss at high load, contributing to 85% typical efficiency at 12 VIN/3.3 VOUT/300 mA. |
| Shutdown Quiescent Current | 16 µA (typ) - enables ultra-low-power standby in battery-critical applications like portable instruments. |
| Thermal Shutdown Threshold | 175°C (typ), recovery at 155°C - provides self-protection during overload or poor heatsinking without latch-up. |
Pinout & Package
SOT-6L (DDC) package, 1.60 mm × 2.90 mm body size, 0.95 mm max height - optimized for thin-profile industrial and portable PCBs with minimal board area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap supply | Provides gate drive voltage for internal high-side MOSFET; requires 0.15 µF ceramic capacitor between CB and SW. |
| GND | Power ground | Primary return path for switch current and IC bias; must be low-impedance connection to minimize noise and thermal rise. |
| FB | Feedback input | Monitors output via resistor divider; 0.765-V reference sets VOUT = 0.765 V × (1 + R1/R2); bias current ≤1 µA avoids divider error. |
| SHDN | Enable/disable control | Logic-level input: ≥2.3 V enables, ≤0.3 V disables; 16-µA shutdown IQ achieved when pulled to GND. |
| VIN | Main power input | Accepts 4.5–42 V; includes UVLO (3.7 V turn-on) and internal ESD protection; decoupled with 2.2 µF ceramic capacitor. |
| SW | Switch node | Drives external inductor and Schottky diode; connects to CBOOT capacitor; handles peak currents up to 1.7 A (LM2842 limit). |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation network - reduces BOM count and design iteration time for standard buck topologies. |
| Soft-start via SHDN pin | RC-controlled ramp of current limit enables user-tailored startup timing - prevents inrush into large output capacitors without extra ICs. |
| Low RDS(ON) switch | 0.9 Ω typical - improves full-load efficiency by ~5% vs. comparable 1.5 Ω devices at 300 mA, reducing thermal stress in sealed enclosures. |
| Fixed 550-kHz frequency | Enables predictable EMI filtering and consistent inductor sizing - avoids variable-frequency jitter while maintaining >80% efficiency across 4.5–42 V input. |
| Thermal & UVLO protection | Independent fault detection circuits shut down power stage before damage - ensures reliability in automotive accessory or industrial field equipment. |
Applications
| Industrial Sensor Node Power | Battery-Powered Handheld Instrument |
|---|---|
Use Scenario: Powers 3.3-V microcontroller, analog front-end, and wireless transceiver from 12–24 V industrial bus or LiFePO4 battery pack. IC Role / Device Role / Timing Role: Primary step-down regulator providing regulated 3.3 V with <10 mV ripple and fast transient response to MCU wake-up events. Use Value: Delivers 600 mA continuously at 85% efficiency, enabling >12-month runtime on 2000-mAh battery while meeting IEC 61000-4-2 ESD immunity requirements. | Use Scenario: Supplies 5-V USB-peripheral interface and 3.3-V logic from single 7–42 V input in portable multimeter or oscilloscope probe. IC Role / Device Role / Timing Role: Adjustable-output buck converter configured for 5 V output using precision resistor divider; SHDN pin enables system-level power sequencing. Use Value: 16-µA shutdown current extends shelf life; 550-kHz switching allows compact 15 µH inductor and 47 µF ceramic output cap - fits sub-20 mm² footprint. |
| Distributed 24-V Rail Regulation | Portable Media Player Core Supply |
Use Scenario: Generates local 1.8-V or 3.3-V rail from 24-V factory automation bus for PLC I/O modules or motor driver logic. IC Role / Device Role / Timing Role: Non-isolated point-of-load regulator with thermal shutdown and UVLO - withstands brownouts and ambient temperatures up to 85°C. Use Value: 42-V absolute max input rating tolerates 24-V system surges; SOT-6L package dissipates heat effectively with 121°C/W RθJA, avoiding derating below 400 mA at 70°C ambient. | Use Scenario: Provides clean 1.2-V core voltage for ARM Cortex-M4 processor in ruggedized audio recorder operating from 3.6–4.2 V Li-ion cell. IC Role / Device Role / Timing Role: High-efficiency buck converter with soft-start - prevents voltage droop during processor boot and burst-mode audio decoding. Use Value: 0.765-V reference enables accurate low-voltage setting (e.g., 1.2 V with 549 Ω/1 kΩ divider); 100 ns min ON-time supports high VIN/VOUT ratios (e.g., 4.2 V → 1.2 V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2842XMK-3.3/NOPB | Fixed 3.3-V output; no FB divider required; identical 600-mA rating and 550-kHz frequency. | Reduces BOM count and layout complexity where 3.3 V is standard; lacks output adjustability. | Select when fixed 3.3 V suffices and board space is constrained - eliminates two resistors and associated routing. |
| TPS54202DRCT | 4.5–28-V input, 2-A output, 500-kHz frequency, integrated high/low-side FETs; requires external compensation. | Higher current and lower input range; supports synchronous rectification for improved light-load efficiency. | Choose for designs needing >600 mA or better than 90% efficiency at 10–100 mA loads - but adds layout complexity and cost. |
Compared with LM2842XMK-3.3/NOPB, the LM2842XMK-ADJL/NOPB trades simplicity for flexibility in output voltage; versus TPS54202DRCT, it offers lower cost and smaller footprint at the expense of current headroom and synchronous efficiency - making it optimal for cost-sensitive, space-limited 600-mA applications.
Availability
LM2842XMK-ADJL/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, battery-powered handheld instruments, and distributed 24-V rail regulation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM2842XMK-ADJL/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 power management technologies, with over 90 years of innovation in industrial, automotive, and consumer electronics.
The LM284x SIMPLE SWITCHER® product line delivers easy-to-use, internally compensated buck regulators targeting cost-sensitive, space-constrained applications requiring reliable 100–600 mA DC/DC conversion from wide-input industrial or battery sources.
FAQ
What is the maximum output current supported by the LM2842XMK-ADJL/NOPB?
The LM2842XMK-ADJL/NOPB is rated for up to 600 mA DC output current under recommended operating conditions (TJ ≤ 125°C). This is validated across the full 4.5–42 V input range and confirmed by switch current limit testing (1.15 A typ, 1.7 A max at −40°C to 125°C). Derating applies above 70°C ambient due to thermal resistance (121°C/W).
Does the LM2842XMK-ADJL/NOPB require external compensation components?
No, the LM2842XMK-ADJL/NOPB features internal compensation - eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces bill-of-materials count, and ensures stable operation with standard output capacitor ESR values (≤0.1 Ω) and inductors from 10–22 µH.
How is the output voltage set on the LM2842XMK-ADJL/NOPB?
The output voltage is set using a resistor divider connected between VOUT, FB, and GND. The LM2842XMK-ADJL/NOPB references 0.765 V at the FB pin, so VOUT = 0.765 V × (1 + R1/R2). Recommended resistor values range from 100 Ω to 10 kΩ for R2 to minimize bias current error, as FB pin current is only 0.1 µA typical.
What is the purpose of the CB pin on the LM2842XMK-ADJL/NOPB?
CB is the bootstrap capacitor terminal for the internal high-side MOSFET gate driver. A 0.15 µF (or larger) ceramic capacitor must be placed between CB and SW to generate sufficient gate-source voltage (>5 V) for low RDS(ON) operation. This ensures efficient switching and prevents shoot-through during transitions.
Can the LM2842XMK-ADJL/NOPB be used in automotive applications?
The LM2842XMK-ADJL/NOPB is not AEC-Q200 qualified and lacks automotive-specific validation (e.g., extended temperature grade, enhanced ESD, or PPAP documentation). While its 42-V absolute max input and thermal shutdown support some 12-V/24-V vehicle subsystems, TI recommends the LM2842Q-Q1 for automotive-grade deployment per SNVSBE5 datasheet.
LM2842XMK-ADJL/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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LM2842XMK-ADJL/NOPB FAQ
1.How can I place an order for LM2842XMK-ADJL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2842XMK-ADJL/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 LM2842XMK-ADJL/NOPB reliable?
The price and inventory of LM2842XMK-ADJL/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2842XMK-ADJL/NOPB is usually 5 days.
3.What payment methods are accepted for LM2842XMK-ADJL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2842XMK-ADJL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2842XMK-ADJL/NOPB?
LM2842XMK-ADJL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2842XMK-ADJL/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 LM2842XMK-ADJL/NOPB?
For technical support, including LM2842XMK-ADJL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2842XMK-ADJL/NOPB requirements.
6.How does Aetrix verify that LM2842XMK-ADJL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2842XMK-ADJL/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 LM2842XMK-ADJL/NOPB meets industry standards.
7.What is the process for return or replacement of LM2842XMK-ADJL/NOPB?
All LM2842XMK-ADJL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2842XMK-ADJL/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 LM2842XMK-ADJL/NOPB part is unused and in its original packaging.
Return procedure for LM2842XMK-ADJL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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