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Texas Instruments LM2842XMKX-ADJL/NOPB
- Part No.:
- LM2842XMKX-ADJL/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2842XMKX-ADJL/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,554
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Product details
Overview
LM2842XMKX-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 voltage, 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 LM2842XMKX-ADJL/NOPB datasheet, LM2842XMKX-ADJL/NOPB pinout, LM2842XMKX-ADJL/NOPB application, or LM2842XMKX-ADJL/NOPB equivalent, key selection criteria include its 600-mA load capability, 16-µA shutdown quiescent current, thermal/UVLO protection, soft-start via SHDN pin, and compatibility with ceramic input/output capacitors and Schottky diodes in compact SOT-6L layouts.
Technical Context
The LM2842XMKX-ADJL/NOPB implements current-mode PWM control with internal compensation, enabling stable regulation without external loop components. Its functional block includes error amplifier, bandgap reference, oscillator (550 kHz), PWM comparator, gate driver, and protection circuits for thermal shutdown, VIN undervoltage lockout (3.7 V turn-on), and CB undervoltage lockout.
Operation relies on external components: bootstrap capacitor (CBOOT) between CB and SW pins enables high-side MOSFET drive; feedback resistors (R1/R2) set VOUT = 0.765 V × (1 + R1/R2); and inductor/diode pair forms the buck power stage. Soft-start is implemented by applying a controlled ramp to the SHDN pin using an 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 accuracy and determines resistor-divider ratio for adjustable VOUT. |
| Switching Frequency | 550 kHz - enables use of small inductors (e.g., 10–15 µH) and low-ESR ceramic capacitors. |
| RDS(ON) | 0.9 Ω typical - minimizes conduction loss at full load, supporting >85% typical efficiency at 12 VIN/3.3 VOUT. |
| Shutdown Quiescent Current | 16 µA typical - reduces system standby power in battery-critical applications. |
| Min ON-Time | 100 ns - supports high step-down ratios (e.g., 42 V → 3.3 V) without pulse-skipping instability. |
Pinout & Package
SOT-6L (DDC) package: 1.60 mm × 2.90 mm body, 0.95 mm max height, gull-wing leads, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap bias supply | Connects external 0.15 µF ceramic capacitor to SW; supplies gate drive voltage for internal high-side FET. |
| GND | Power and signal ground | Common return path for VIN, SW, FB, SHDN; must be low-impedance connection to minimize noise and thermal rise. |
| FB | Feedback input | Monitors output voltage via resistor divider; regulates VOUT to 0.765 V; requires 100 Ω–10 kΩ resistor values to avoid bias current errors. |
| SHDN | Logic-level enable/disable | Pull ≥2.3 V to enable; ≤0.3 V to disable; 16-µA shutdown current; must not float - tie to VIN if unused. |
| VIN | Main power input | Accepts 4.5–42 V DC; requires local 2.2 µF ceramic bypass capacitor to suppress transients and EMI. |
| SW | Power switch node | Drives external inductor and Schottky diode; connects to CBOOT; carries high di/dt switching current - needs short, wide PCB trace. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation network - simplifies design and reduces BOM count. |
| Thermal shutdown with hysteresis | Activates at ~175°C junction temperature; releases at ~155°C - prevents permanent damage during overload or poor heatsinking. |
| Soft-start via SHDN pin | RC-controlled voltage ramp on SHDN modulates cycle-by-cycle current limit - limits inrush current and output overshoot. |
| Short-circuit protected | Current-limit circuit engages at 1.15 A (typical) - protects device and external components during output fault conditions. |
| Low-profile SOT-6L package | Enables compact, low-height power solutions on space-constrained PCBs - compatible with standard reflow profiles. |
Applications
| Industrial Distributed Power | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Powering microcontrollers, sensors, and analog front-ends in programmable logic controllers (PLCs) and remote I/O modules operating from 24-V DC rails. IC Role / Device Role / Timing Role: Primary step-down regulator converting 24 V or 36 V field bus voltage to 3.3 V or 5 V logic supply. Use Value: 42-V max input withstands load-dump transients; 600-mA output supports multi-rail loads; 121 °C/W θJA enables operation without heatsink in ambient ≤70°C. | Use Scenario: Supplying portable handheld test equipment (e.g., multimeters, oscilloscope probes) powered by Li-ion or alkaline batteries. IC Role / Device Role / Timing Role: Adjustable buck converter maintaining regulated 3.3 V output across 4.5–42 V input range as battery discharges or changes configuration. Use Value: 16-µA shutdown current extends battery life in sleep mode; 550-kHz switching allows small 15-µH inductor and 22-µF ceramic output cap - minimizing board area and weight. |
| Portable Media Players | Automotive Aftermarket Modules |
Use Scenario: Providing clean 1.2 V or 1.8 V core voltage for audio codecs and flash memory in portable music players. IC Role / Device Role / Timing Role: Secondary regulator deriving low-voltage rail from main 3.3 V or 5 V supply. Use Value: 0.765 V feedback reference enables precise low-VOUT setting (e.g., 1.2 V with R1=1.02 kΩ, R2=1.02 kΩ); internal compensation avoids stability issues with low-ESR ceramic caps. | Use Scenario: Powering CAN transceivers, display drivers, and microcontrollers in vehicle infotainment add-ons connected to 12 V or 24 V battery systems. IC Role / Device Role / Timing Role: Input-tolerant DC/DC converter handling cold-crank (≥4.5 V) and load-dump (≤42 V) events per ISO 7637-2. Use Value: UVLO threshold (3.7 V turn-on) prevents brownout operation during cranking; 42-V absolute max rating ensures robustness against transient spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2842XMKX-3.3/NOPB | Fixed 3.3 V output; no external feedback resistors 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 simplifies design and eliminates resistor tolerance impact on accuracy. |
| TPS54202DRCT | Synchronous buck; 4.5–28 V input; 2-A output; 500-kHz switching; integrated high/low-side FETs; requires external compensation. | Higher current, smaller solution size, better light-load efficiency; more complex loop tuning and layout. | Choose for higher output current or improved efficiency below 100 mA; verify thermal performance at full load. |
Compared with LM2842XMKX-3.3/NOPB, the LM2842XMKX-ADJL/NOPB trades fixed-output simplicity for design flexibility across multiple VOUT points; versus TPS54202DRCT, it offers lower cost and simpler layout at the expense of peak current capability and synchronous efficiency.
Availability
LM2842XMKX-ADJL/NOPB is available at Aetrix Electronics and suitable for industrial distributed power, battery-powered instrumentation, and automotive aftermarket modules requiring stable component supply and long-term manufacturability.
Supply support for LM2842XMKX-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 company headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and power management devices for industrial, automotive, and consumer markets.
The LM284x SIMPLE SWITCHER® product line delivers easy-to-use, internally compensated buck regulators targeting cost-sensitive, space-constrained applications where minimal external components and fast time-to-market are critical.
FAQ
What is the maximum output current supported by the LM2842XMKX-ADJL/NOPB?
The LM2842XMKX-ADJL/NOPB is rated for up to 600 mA of continuous DC output current, as specified in the LM284x family datasheet under recommended operating conditions. This rating assumes proper thermal management - the device features thermal shutdown at ~175°C and has a junction-to-ambient thermal resistance of 121 °C/W in the SOT-6L package. Derating is required above 70°C ambient temperature.
How do I set the output voltage for the LM2842XMKX-ADJL/NOPB?
The LM2842XMKX-ADJL/NOPB uses a resistor divider connected to the FB pin to set VOUT, based on the formula VOUT = 0.765 V × (1 + R1/R2). For example, to achieve 5 V output, select R2 = 1.02 kΩ and R1 = 5.62 kΩ. Resistor values must stay within 100 Ω to 10 kΩ to avoid errors from FB pin bias current (≤1 µA). The LM2842XMKX-ADJL/NOPB does not support fixed-output variants - adjustment is mandatory.
What is the purpose of the CB pin on the LM2842XMKX-ADJL/NOPB?
On the LM2842XMKX-ADJL/NOPB, the CB (Charge Bootstrap) pin supplies gate drive voltage to the internal high-side MOSFET. It must be connected to the SW pin through a 0.15 µF or larger ceramic capacitor (CBOOT). During each switching cycle, this capacitor charges from VIN and provides the boosted voltage needed to fully enhance the high-side FET - ensuring low RDS(ON) and high efficiency. An undersized or missing CBOOT causes erratic operation or failure to start.
Can the LM2842XMKX-ADJL/NOPB operate with input voltages below 4.5 V?
No - the LM2842XMKX-ADJL/NOPB has a guaranteed minimum input voltage of 4.5 V per its recommended operating conditions. Below this, the internal UVLO circuit disables operation: the turn-on threshold is 3.7 V (typical), but reliable regulation and current delivery are only ensured from 4.5 V onward. Attempting to operate at 4.2 V may result in intermittent startup, reduced output current, or thermal shutdown due to insufficient gate drive.
Does the LM2842XMKX-ADJL/NOPB require external compensation components?
No - the LM2842XMKX-ADJL/NOPB features an internally compensated current-mode control loop, eliminating the need for external compensation networks such as Type II or III compensators. This simplifies design, reduces bill-of-materials cost, and improves layout robustness. All stability criteria are met with the standard external components: input/output capacitors, inductor, bootstrap capacitor, feedback resistors, and Schottky diode - as shown in the TI datasheet's typical application circuits.
LM2842XMKX-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
LM2842XMKX-ADJL/NOPB FAQ
1.How can I place an order for LM2842XMKX-ADJL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2842XMKX-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 LM2842XMKX-ADJL/NOPB reliable?
The price and inventory of LM2842XMKX-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 LM2842XMKX-ADJL/NOPB is usually 5 days.
3.What payment methods are accepted for LM2842XMKX-ADJL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2842XMKX-ADJL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2842XMKX-ADJL/NOPB?
LM2842XMKX-ADJL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2842XMKX-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 LM2842XMKX-ADJL/NOPB?
For technical support, including LM2842XMKX-ADJL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2842XMKX-ADJL/NOPB requirements.
6.How does Aetrix verify that LM2842XMKX-ADJL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2842XMKX-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 LM2842XMKX-ADJL/NOPB meets industry standards.
7.What is the process for return or replacement of LM2842XMKX-ADJL/NOPB?
All LM2842XMKX-ADJL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2842XMKX-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 LM2842XMKX-ADJL/NOPB part is unused and in its original packaging.
Return procedure for LM2842XMKX-ADJL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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