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Texas Instruments LM2842YMKX-ADJL/NOPB
- Part No.:
- LM2842YMKX-ADJL/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2842YMKX-ADJL/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:8,899
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Product details
Overview
LM2842YMKX-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, 1.25 MHz 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 for industrial distributed power and battery-powered instrumentation.
For engineers reviewing the LM2842YMKX-ADJL/NOPB datasheet, LM2842YMKX-ADJL/NOPB pinout, LM2842YMKX-ADJL/NOPB application, or LM2842YMKX-ADJL/NOPB equivalent, key selection criteria include its 1.25 MHz switching frequency enabling compact external components, 16 µA shutdown quiescent current, thermal/UVLO protection, soft-start implementation via SHDN pin, and compatibility with ceramic input/output capacitors and Schottky diodes in space-constrained designs.
Technical Context
The LM2842YMKX-ADJL/NOPB implements current-mode PWM control with internal compensation, operating in continuous conduction mode across its full 4.5–42 V input range. Its functional block includes an error amplifier referenced to 0.765 V, gate driver with CB/SW bootstrap architecture, cycle-by-cycle current limiting, and dedicated UVLO (3.7 V turn-on) and thermal shutdown (175 °C trip) circuits.
Switching behavior is defined by fixed 1.25 MHz oscillator with minimum ON-time of 100 ns and minimum OFF-time of 104 ns, supporting duty cycles up to 87%. The SHDN pin enables analog-controlled soft-start by modulating current limit from 0 to full rating as voltage ramps from 0 V to 2.3 V, while also providing digital enable/disable functionality when pulled high or low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide-range unregulated sources including automotive batteries and industrial rails. |
| Max Output Current | 600 mA - rated continuous load capability per LM2842 family specification, validated at TJ ≤ 125 °C. |
| Feedback Reference Voltage | 0.765 V ±1.5% - sets output voltage precision via external resistor divider (VOUT = 0.765 × (1 + R1/R2)). |
| Switching Frequency | 1.25 MHz - enables use of small inductors (e.g., 10–47 µH) and low-ESR ceramic capacitors for minimal board area. |
| RDS(ON) | 0.9 Ω typical - reduces conduction loss and improves efficiency at medium loads (e.g., 85% typical at 12 VIN/3.3 VOUT/100 mA). |
| Shutdown Quiescent Current | 16 µA typical - minimizes battery drain during system sleep modes without requiring external disconnect circuitry. |
| Thermal Shutdown Threshold | 175 °C typical - protects against sustained overload or poor heatsinking; auto-recovery at ~155 °C. |
Pinout & Package
LM2842YMKX-ADJL/NOPB uses the DDC (SOT-6L) package: 1.60 mm × 2.90 mm, low-profile surface-mount outline with exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap bias supply | Connects to CBOOT capacitor between CB and SW; provides gate drive voltage for internal high-side MOSFET. |
| GND | Power and signal ground | Common return path for VIN, SW, FB, SHDN, and internal circuitry; must be low-impedance PCB plane. |
| FB | Feedback input | Senses output voltage via resistor divider; regulates VOUT to 0.765 V reference; bias current <1 µA avoids divider loading. |
| SHDN | Enable/shutdown control | Logic-level input: ≥2.3 V enables operation, ≤0.3 V disables; supports analog soft-start when ramped with RC network. |
| VIN | Main power input | Accepts 4.5–42 V DC; requires local 2.2–10 µF ceramic bypass capacitor (CIN) near pin for transient suppression. |
| SW | Switch node output | Drives external inductor and Schottky diode; connects to CBOOT capacitor; carries high-frequency pulsed current. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation components - simplifies design and reduces BOM count. |
| Soft-start via SHDN pin | Enables user-defined startup time using external RC network - prevents inrush current and output overshoot. |
| Short-circuit protected | Current-limiting shuts down SW node during output short - prevents device damage under fault conditions. |
| Low RDS(ON) integrated switch | 0.9 Ω typical reduces conduction losses - improves efficiency especially at higher output currents. |
| Fixed-frequency current-mode PWM | 1.25 MHz operation ensures predictable EMI profile and stable regulation under line/load transients. |
Applications
| Industrial Distributed Power | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Regulating 24 V or 36 V factory bus to 3.3 V or 5 V for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: Primary buck converter supplying logic and analog circuitry with tight load regulation and thermal robustness. Use Value: 42 V max input withstands industrial surge transients; 600 mA output supports multiple downstream LDOs or microcontrollers. | Use Scenario: Powering handheld test meters, portable data loggers, or wireless sensor nodes from single Li-ion or multi-cell alkaline packs. IC Role / Device Role / Timing Role: Main DC/DC regulator converting variable battery voltage (e.g., 4.5–42 V) to stable system rail. Use Value: 16 µA shutdown IQ extends battery life in standby; small SOT-6L footprint saves PCB area in compact enclosures. |
| Portable Media Players | Automotive Aftermarket Electronics |
Use Scenario: Generating 1.2 V core voltage and 3.3 V I/O rail from 5–12 V USB or battery source in audio/video players. IC Role / Device Role / Timing Role: High-efficiency step-down stage preceding low-noise LDOs for sensitive analog subsystems. Use Value: 1.25 MHz switching allows miniature inductors (<2 mm height); low ripple supports clean audio performance. | Use Scenario: Converting vehicle battery (9–16 V nominal, up to 42 V load dump) to 5 V for infotainment displays or telematics modules. IC Role / Device Role / Timing Role: Input-stage buck regulator handling wide input variation and transient overvoltage events. Use Value: UVLO (3.7 V turn-on) prevents brownout operation; thermal shutdown protects during engine cranking or high ambient temps. |
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-ADJ/NOPB | Same LM2842 family, X option: 550 kHz switching frequency instead of 1.25 MHz Y option. | Requires larger inductor (e.g., 22–47 µH vs. 10–15 µH) and may increase solution size; lower switching loss at high input voltages. | Select X variant if EMI filtering priority outweighs board area constraints; verify thermal performance at full 600 mA load. |
| TPS62825ADSGR | Synchronous buck, 2.5–6 V input, 1.5 A output, 2.25 MHz, integrated FETs, 0.6 V reference. | Not pin-compatible; narrower input range but higher efficiency and current capability; requires different layout and feedback network. | Choose for battery-only systems needing >600 mA or ultra-low IQ (<1 µA); not suitable for 12–42 V industrial inputs. |
Compared with LM2842XMKX-ADJ/NOPB, the LM2842YMKX-ADJL/NOPB delivers faster transient response and smaller magnetics due to 1.25 MHz operation, while TPS62825ADSGR offers synchronous rectification and higher current but lacks 42 V input tolerance - making LM2842YMKX-ADJL/NOPB optimal for wide-input, space-sensitive industrial and automotive auxiliary rails.
Availability
LM2842YMKX-ADJL/NOPB is available at Aetrix Electronics and suitable for industrial distributed power, battery-powered instrumentation, and automotive aftermarket electronics requiring stable component supply and long-term manufacturability.
Supply support for LM2842YMKX-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 specializing in analog, embedded processing, and power management ICs, with leadership in high-reliability industrial and automotive solutions.
The LM284x SIMPLE SWITCHER® product line was designed for ease-of-use in cost-sensitive, space-constrained DC/DC conversion applications requiring wide input voltage range and minimal external components.
FAQ
What is the maximum output current supported by the LM2842YMKX-ADJL/NOPB?
The LM2842YMKX-ADJL/NOPB is rated for up to 600 mA continuous DC output current under recommended operating conditions (TJ ≤ 125 °C, VIN = 12 V, VOUT = 3.3 V). This is confirmed in the Electrical Characteristics table for LM2842 devices, where switch current limit is specified as 1.15 A typical at 25 °C, derating to 1.7 A maximum across –40 °C to 125 °C junction temperature range. Actual achievable current depends on thermal design and input/output voltage differential.
How does the SHDN pin function in the LM2842YMKX-ADJL/NOPB?
The SHDN pin on the LM2842YMKX-ADJL/NOPB serves dual functions: digital enable/disable and analog soft-start control. Pulling SHDN ≥2.3 V enables regulation; ≤0.3 V disables the device, reducing IQ to 16 µA. When ramped with an RC network from 0 V to 2.3 V, it linearly modulates the cycle-by-cycle current limit - allowing controlled output voltage rise and inrush current limiting. The pin must never be left floating and should be tied to VIN if unused.
What is the purpose of the CB pin on the LM2842YMKX-ADJL/NOPB?
The CB pin on the LM2842YMKX-ADJL/NOPB provides gate drive bias for the internal high-side MOSFET. It must be connected to a bootstrap capacitor (CBOOT) between CB and SW. During each switching cycle, this capacitor charges through an internal diode when SW is low and supplies the gate voltage needed to fully enhance the high-side switch when SW goes high - ensuring low RDS(ON) and efficient operation. A 0.15 µF ceramic capacitor is recommended minimum.
Can the LM2842YMKX-ADJL/NOPB be used with an input voltage below 4.5 V?
No - the LM2842YMKX-ADJL/NOPB has a guaranteed minimum operating input voltage of 4.5 V per Recommended Operating Conditions. Below this, undervoltage lockout (UVLO) prevents operation: the device turns on only when VIN exceeds 3.7 V (typical), but stable regulation requires ≥4.5 V. Attempting to operate below 4.5 V risks erratic behavior, insufficient gate drive, or failure to regulate. For sub-4.5 V inputs, consider alternative regulators such as TPS6282x or LP8733xx series.
What feedback reference voltage does the LM2842YMKX-ADJL/NOPB use, and how is output voltage set?
The LM2842YMKX-ADJL/NOPB uses a precise 0.765 V feedback reference voltage (VFB) at the FB pin. Output voltage is set externally using a resistor divider: VOUT = 0.765 V × (1 + R1/R2), where R2 connects from FB to GND and R1 from VOUT to FB. Resistor values should be between 100 Ω and 10 kΩ to minimize bias current error; typical designs use R2 = 1.02 kΩ and R1 = 3.4 kΩ for 3.3 V output.
LM2842YMKX-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:
- 1.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LM2842YMKX-ADJL/NOPB FAQ
1.How can I place an order for LM2842YMKX-ADJL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2842YMKX-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 LM2842YMKX-ADJL/NOPB reliable?
The price and inventory of LM2842YMKX-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 LM2842YMKX-ADJL/NOPB is usually 5 days.
3.What payment methods are accepted for LM2842YMKX-ADJL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2842YMKX-ADJL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2842YMKX-ADJL/NOPB?
LM2842YMKX-ADJL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2842YMKX-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 LM2842YMKX-ADJL/NOPB?
For technical support, including LM2842YMKX-ADJL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2842YMKX-ADJL/NOPB requirements.
6.How does Aetrix verify that LM2842YMKX-ADJL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2842YMKX-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 LM2842YMKX-ADJL/NOPB meets industry standards.
7.What is the process for return or replacement of LM2842YMKX-ADJL/NOPB?
All LM2842YMKX-ADJL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2842YMKX-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 LM2842YMKX-ADJL/NOPB part is unused and in its original packaging.
Return procedure for LM2842YMKX-ADJL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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