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Texas Instruments LM2842YMK-ADJL/NOPB
- Part No.:
- LM2842YMK-ADJL/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2842YMK-ADJL/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,515
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Product details
Overview
LM2842YMK-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 (Y option), and 4.5-V to 42-V input range. It serves as the core power conversion stage in compact industrial and portable power supplies.
For engineers reviewing the LM2842YMK-ADJL/NOPB datasheet, LM2842YMK-ADJL/NOPB pinout, LM2842YMK-ADJL/NOPB application, or LM2842YMK-ADJL/NOPB equivalent, key selection criteria include its 1.25-MHz operation enabling small external magnetics, internal 0.9-Ω MOSFET switch, thermal shutdown protection, soft-start via SHDN pin, and compatibility with adjustable output designs using FB resistor divider.
Technical Context
The LM2842YMK-ADJL/NOPB implements current-mode PWM control with integrated high-side N-channel MOSFET and gate driver. Its functional block includes error amplifier, 0.765-V bandgap reference, oscillator (1.25 MHz), current-sense circuitry, thermal shutdown comparator, UVLO on VIN, and CB undervoltage lockout for bootstrap capacitor integrity.
It operates in continuous conduction mode (CCM) with minimum ON-time of 100 ns and maximum duty cycle of 87%, supporting wide input-to-output voltage ratios. The SHDN pin enables analog-controlled soft-start by modulating cycle-by-cycle current limit between 0 V and 2.3 V, while shutdown quiescent current remains at 16 µA typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to 12-V, 24-V, and 36-V industrial bus rails without pre-regulation |
| Max Output Current | 600 mA - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained systems |
| Switching Frequency | 1.25 MHz - enables use of sub-22-µH inductors and low-ESR ceramic capacitors for minimal solution footprint |
| Feedback Reference Voltage | 0.765 V - allows precise output regulation down to ~0.8 V with standard resistor values and low divider current error |
| Internal Switch RDS(ON) | 0.9 Ω typical - delivers >85% typical efficiency at 12-V input / 3.3-V output / 300-mA load |
| Shutdown Quiescent Current | 16 µA typical - preserves battery life in always-on monitoring circuits during standby |
| Thermal Shutdown Threshold | 175°C typical - protects against sustained overload or poor PCB thermal design without requiring external sensing |
Pinout & Package
LM2842YMK-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 external 0.15-µF ceramic capacitor to SW; ensures sufficient gate drive voltage for internal MOSFET across full input range |
| GND | Power and signal ground | Common return path for internal circuitry, power switch, and feedback network; must be low-impedance connection to PCB ground plane |
| FB | Feedback input | Monitors output voltage via resistor divider; regulates VOUT = 0.765 V × (1 + R1/R2); bias current <1 µA minimizes divider error |
| SHDN | Enable/disable control | Logic-level input: <0.3 V disables regulator (16-µA IQ), >2.3 V enables; tie to VIN if unused; not allowed to float |
| VIN | Main power input | Accepts 4.5–42 V; includes UVLO (turn-on at 3.7 V, turn-off at 3.5 V) and internal ESD protection |
| SW | Switch node output | Drives external inductor and Schottky diode; connects to CBOOT capacitor; 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 |
| Soft-start via SHDN pin | RC-filtered SHDN voltage controls ramp rate of output voltage and limits inrush current without extra components |
| Short-circuit protected | Current-limit foldback prevents damage during output short; rated 1.15 A typical at 25°C |
| Thermal shutdown | Auto-recovery hysteresis (175°C trip, 155°C release) protects die under sustained overload or poor heatsinking |
| Low EMI layout support | SOT-6L pinout places GND, SW, and VIN to minimize high-current loop area - critical for meeting CISPR-22 Class B |
Applications
| Industrial Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Powering a 32-bit ARM Cortex-M4 MCU, MEMS accelerometer, and BLE radio from a 24-V field bus with strict size constraints. IC Role / Device Role / Timing Role: Primary buck regulator providing stable 3.3-V rail; handles transient loads up to 500 mA during radio transmission bursts. Use Value: 1.25-MHz operation enables 10-µH inductor and 22-µF ceramic output cap - reducing total solution area to <30 mm². | Use Scenario: Generating 5-V and 3.3-V rails from two AA batteries (2.4–3.2 V) boosted to 12 V, then stepped down for display and analog front-end. IC Role / Device Role / Timing Role: Secondary buck stage converting 12-V intermediate rail to regulated 3.3-V logic supply with tight load regulation. Use Value: 0.765-V feedback reference allows accurate 3.3-V output even with ±1% resistors; 16-µA shutdown IQ extends battery runtime in sleep mode. |
| Automated Test Equipment PSU | Rail-to-Rail Industrial I/O Module |
Use Scenario: Providing isolated 5-V auxiliary supply for FPGA configuration and ADC reference in modular test instruments operating from 36-V backplane. IC Role / Device Role / Timing Role: Non-isolated buck converter feeding downstream isolated DC/DC; withstands 42-V transients per IEC 61000-4-5 Level 3. Use Value: 42-V absolute max input rating and robust UVLO (3.7 V turn-on) ensure reliable start-up after brownouts and hot-plug events. | Use Scenario: Powering 24-V digital I/O drivers and 5-V microcontroller in DIN-rail mounted PLC module with ambient temperature up to 70°C. IC Role / Device Role / Timing Role: Main system regulator delivering 600 mA at 5 V; thermally coupled to metal chassis via exposed pad. Use Value: 121°C/W junction-to-ambient thermal resistance and 175°C thermal shutdown allow full-load operation at 70°C ambient without derating. |
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-ADJ/NOPB | 550-kHz switching frequency (X option) vs 1.25-MHz (Y); identical pinout, package, and electrical specs otherwise | Better efficiency at light loads; requires larger inductor (e.g., 22 µH) and higher-output-capacitance for same ripple | Select X version when optimizing for peak efficiency >20% load; Y version when minimizing solution size is priority |
| TPS54202DDCR | Synchronous buck (no external diode needed); 4.5–28-V input; 400-kHz to 2.5-MHz adjustable frequency; 2-A output capability | Higher output current, lower dropout, no external diode - but larger 6-pin SOT-23-6 package and more complex compensation | Choose TPS54202DDCR when >600 mA load or synchronous rectification is required; LM2842YMK-ADJL/NOPB preferred for cost-sensitive, space-limited 600-mA apps |
Compared with LM2842XMK-ADJ/NOPB, the LM2842YMK-ADJL/NOPB trades slightly lower light-load efficiency for significantly smaller passive components and faster transient response. Against TPS54202DDCR, it offers simpler BOM and layout at the expense of output current headroom and synchronous efficiency gains.
Availability
LM2842YMK-ADJL/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, automated test equipment PSUs, and rail-to-rail industrial I/O modules requiring stable component supply and long-term manufacturability.
Supply support for LM2842YMK-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 system-on-chip solutions for industrial, automotive, and personal electronics markets.
The LM284x SIMPLE SWITCHER® product line was developed to deliver easy-to-use, highly integrated buck regulators for space-constrained applications where reliability, wide input range, and minimal external components are critical - especially in industrial power conditioning and battery-powered instrumentation.
FAQ
What is the recommended inductor value for LM2842YMK-ADJL/NOPB in a 12-V to 3.3-V, 600-mA application?
For LM2842YMK-ADJL/NOPB operating at 1.25 MHz with 12-V input and 3.3-V output, a 10-µH to 15-µH shielded power inductor rated for ≥1.1-A saturation current is recommended. TI's datasheet specifies 15 µH in the 3.3-V reference design. Lower inductance increases ripple current and may reduce efficiency; higher inductance slows transient response and increases physical size. Always verify saturation margin under peak load conditions.
Can LM2842YMK-ADJL/NOPB be used with an input voltage below 4.5 V?
No - LM2842YMK-ADJL/NOPB has a guaranteed minimum operating input voltage of 4.5 V per its Recommended Operating Conditions. Below this, the internal UVLO circuit disables the device (turn-off threshold is 3.5 V typical). Attempting to operate below 4.5 V risks unstable regulation or complete shutdown. For sub-4.5-V inputs, consider TI's TPS62840 or similar nano-power buck regulators.
How does the SHDN pin enable soft-start functionality in LM2842YMK-ADJL/NOPB?
The SHDN pin on LM2842YMK-ADJL/NOPB provides analog soft-start control: applying a linearly rising voltage (e.g., via RC ramp) between 0 V and 2.3 V modulates the internal current limit from zero to full rating, thereby controlling output voltage rise time and limiting inrush current. This eliminates need for external soft-start ICs or sequencing controllers in cost-sensitive designs.
What is the purpose of the CB pin on LM2842YMK-ADJL/NOPB, and what capacitor value is required?
The CB pin on LM2842YMK-ADJL/NOPB supplies gate drive voltage to the internal high-side MOSFET via a bootstrap capacitor connected between CB and SW. A 0.15-µF ceramic capacitor is minimum; 0.22–1 µF is recommended for inputs <2×VOUT to maintain low RDS(ON) across duty cycles. Use X7R/X5R dielectric with ≤100 mΩ ESR and voltage rating ≥16 V.
Does LM2842YMK-ADJL/NOPB require external compensation components?
No - LM2842YMK-ADJL/NOPB is internally compensated. Its control loop is factory-tuned for stability with standard external components (inductor, output capacitor, feedback resistors). No external compensation network (e.g., Type II/III compensator) is needed, simplifying design, reducing BOM count, and improving layout robustness across input/output combinations.
LM2842YMK-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
LM2842YMK-ADJL/NOPB FAQ
1.How can I place an order for LM2842YMK-ADJL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2842YMK-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 LM2842YMK-ADJL/NOPB reliable?
The price and inventory of LM2842YMK-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 LM2842YMK-ADJL/NOPB is usually 5 days.
3.What payment methods are accepted for LM2842YMK-ADJL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2842YMK-ADJL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2842YMK-ADJL/NOPB?
LM2842YMK-ADJL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2842YMK-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 LM2842YMK-ADJL/NOPB?
For technical support, including LM2842YMK-ADJL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2842YMK-ADJL/NOPB requirements.
6.How does Aetrix verify that LM2842YMK-ADJL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2842YMK-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 LM2842YMK-ADJL/NOPB meets industry standards.
7.What is the process for return or replacement of LM2842YMK-ADJL/NOPB?
All LM2842YMK-ADJL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2842YMK-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 LM2842YMK-ADJL/NOPB part is unused and in its original packaging.
Return procedure for LM2842YMK-ADJL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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