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Texas Instruments LM2840YMKX-ADJL/NOPB
- Part No.:
- LM2840YMKX-ADJL/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2840YMKX-ADJL/NOPB.pdf
- Description:
- IC REG BUCK ADJ 100MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,470
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Product details
Overview
LM2840YMKX-ADJL/NOPB from Texas Instruments is a 100 mA, 4.5V–42V input, adjustable-output synchronous step-down DC/DC regulator in SOT-6L package, featuring 1.25 MHz fixed switching frequency, 0.765 V feedback reference, and integrated 0.9 Ω high-side MOSFET - used for compact, efficient power conversion in battery-powered industrial sensors and portable instrumentation.
For engineers reviewing the LM2840YMKX-ADJL/NOPB datasheet, LM2840YMKX-ADJL/NOPB pinout, LM2840YMKX-ADJL/NOPB application, or LM2840YMKX-ADJL/NOPB equivalent, key selection criteria include its 1.25 MHz operation enabling small external LC components, 16 µA shutdown current for ultra-low-power standby, and internal compensation eliminating loop stability tuning.
Technical Context
This device implements current-mode PWM control with an internal 0.9 Ω high-side switch and dedicated gate drive bias (CB pin) for optimal RDS(on) utilization. Its 1.25 MHz fixed-frequency oscillator enables fast transient response and reduces output voltage ripple without requiring external frequency programming.
Protection features include thermal shutdown (engages at ~175°C), input UVLO (4.4 V turn-on / 3.5 V turn-off), and gate-drive under-voltage lockout - all operating autonomously without external supervision. Soft-start is implemented via RC network on SHDN pin, modulating cycle-by-cycle current limit during startup.
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 24 V rails. |
| Output Current Capability | 100 mA continuous - optimized for low-power loads such as microcontroller cores, analog sensors, and RF modules. |
| Switching Frequency | 1.25 MHz - enables use of sub-10 µH inductors and <100 µF ceramic output capacitors for space-constrained designs. |
| Feedback Reference Voltage | 0.765 V ±1.8% - sets output via resistor divider; allows precise adjustment from 0.8 V up to near VIN with minimal divider error. |
| Shutdown Quiescent Current | 16 µA typical - ensures negligible battery drain in sleep mode for portable equipment with long idle periods. |
| Internal Switch RDS(on) | 0.9 Ω typical - delivers >85% efficiency at 100 mA load with 12 V input and 3.3 V output, reducing thermal stress. |
| Thermal Resistance (θJA) | 121 °C/W - requires minimal PCB copper area for thermal management in standard SOT-6L layouts. |
Pinout & Package
SOT-6L package (Package Drawing DDC), 2.9 mm × 1.6 mm × 1.0 mm profile, RoHS-compliant, green finish (Pb-free, no Sb/Br), moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CB | Bootstrap gate bias supply | Connects external 0.15 µF ceramic capacitor to SW; supplies gate drive voltage for internal high-side FET. |
| 2: GND | Power and signal ground reference | Primary return path for IC core, feedback network, and external components; must be low-impedance connection. |
| 3: FB | Feedback input | Monitors output voltage via resistor divider; regulates output by maintaining 0.765 V at this pin. |
| 4: SHDN | Logic-level enable/disable control | Pull ≥2.3 V to enable; ≤0.9 V to disable; supports RC soft-start by modulating current limit during ramp-up. |
| 5: VIN | Main power input | Accepts 4.5–42 V; supplies internal bias and high-side switch; requires local 2.2 µF ceramic bypass capacitor. |
| 6: SW | Switch node | Drives external inductor and bootstrap capacitor; connects to cathode of external Schottky diode in non-synchronous configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation network - simplifies design, reduces BOM count, and guarantees stability across operating conditions. |
| Fixed 1.25 MHz switching frequency | Enables consistent EMI profile and predictable filter design; avoids audible noise and supports miniaturized magnetics. |
| Short-circuit protected power stage | Current-limit protection engages before thermal damage occurs; limits peak switch current to 525–900 mA depending on duty cycle. |
| Low-RDS(on) integrated high-side FET | 0.9 Ω typical RDS(on) minimizes conduction loss at light-to-moderate loads, improving efficiency over discrete solutions. |
| Soft-start via SHDN pin | RC-controlled startup prevents inrush current spikes into output capacitor - protects downstream circuitry and input source. |
Applications
| Industrial Sensor Node Power | Portable Handheld Instrumentation |
|---|---|
|
Use Scenario: Powering low-power MCU, temperature/humidity sensor, and BLE radio in battery-operated field sensor nodes. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3 V from 9–36 V Li-ion or industrial battery stack. Use Value: 16 µA shutdown current extends battery life to multi-year operation; 1.25 MHz operation allows 10 µH inductor and 47 µF output cap in <12 mm² footprint. |
Use Scenario: Supplying precision analog front-end and display controller in handheld multimeter or data logger. IC Role / Device Role / Timing Role: Adjustable-output DC/DC converter generating 5 V or 12 V from variable alkaline or NiMH battery input. Use Value: 0.765 V feedback reference enables accurate output setting across temperature; internal compensation ensures robust regulation despite layout variations. |
| Automotive Body Control Module (BCM) Subsystem | Industrial Distributed Power Rail |
|
Use Scenario: Generating 5 V auxiliary rail for LIN transceivers and door module microcontrollers in non-safety-critical BCM zones. IC Role / Device Role / Timing Role: Secondary regulator stepping down 12 V vehicle battery to isolated logic supply, surviving cold-crank (4.5 V) and load-dump (42 V) events. Use Value: 4.5–42 V input range and UVLO thresholds (4.4 V ON / 3.5 V OFF) ensure reliable operation across full automotive battery envelope. |
Use Scenario: Local point-of-load conversion in programmable logic controller (PLC) I/O modules powered from 24 V backplane. IC Role / Device Role / Timing Role: Compact, thermally efficient buck stage providing 3.3 V or 5 V to FPGA configuration circuitry and ADC references. Use Value: SOT-6L package and 121 °C/W θJA allow operation at full 100 mA load in confined PLC slots without forced air cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2840XMKX-ADJL/NOPB | 550 kHz switching frequency; higher minimum on-time (100 ns vs. 104 ns); lower peak efficiency at light loads due to lower fSW. | Better suited for noise-sensitive analog circuits where lower switching frequency eases EMI filtering; less ideal for ultra-compact layouts. | Select when board space permits larger inductors/caps and EMI filtering priority outweighs size constraints. |
| LM2841YMKX-ADJL/NOPB | 300 mA output rating; identical 1.25 MHz fSW, same pinout and feedback voltage; higher current limit (1.15 A min). | Direct upgrade path for designs scaling beyond 100 mA while retaining layout and component compatibility. | Choose when future-proofing for higher load current or adding peripherals without redesigning power stage. |
Compared with LM2840YMKX-ADJL/NOPB, the X-version offers lower-frequency operation for relaxed EMI mitigation but larger passive components, while the LM2841Y variant provides 3× higher output current in identical footprint - enabling scalable power architecture without changing PCB layout.
Availability
LM2840YMKX-ADJL/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, portable handheld instrumentation, and automotive body control subsystems requiring stable component supply with guaranteed long-term sourcing.
Supply support for LM2840YMKX-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 decades of expertise in high-reliability DC/DC conversion.
The LM2840 family is part of TI's thin-SOT buck regulator portfolio designed specifically for space-constrained, wide-input industrial and automotive applications where simplicity, reliability, and minimal external component count are critical.
FAQ
What is the maximum input voltage rating for LM2840YMKX-ADJL/NOPB?
The absolute maximum input voltage for LM2840YMKX-ADJL/NOPB is +45 V, but the recommended operating range is 4.5 V to 42 V per datasheet specifications. Operation above 42 V risks triggering internal UVLO or exceeding safe SOA limits, even if within absolute max ratings.
Can LM2840YMKX-ADJL/NOPB operate with an output voltage below 0.8 V?
No - LM2840YMKX-ADJL/NOPB requires a minimum feedback voltage of 0.747 V (min) and is not specified for outputs below 0.8 V. The 0.765 V nominal reference and internal error amplifier architecture limit practical adjustability to ≥0.8 V using standard resistor dividers.
Is LM2840YMKX-ADJL/NOPB pin-compatible with LM2841YMKX-ADJL/NOPB?
Yes - LM2840YMKX-ADJL/NOPB and LM2841YMKX-ADJL/NOPB share identical SOT-6L (DDC) package, pinout, and electrical interface; only the current capability (100 mA vs. 300 mA) and switch current limit differ.
What is the purpose of the CB pin on LM2840YMKX-ADJL/NOPB?
The CB pin supplies gate drive voltage to the internal high-side MOSFET via an external bootstrap capacitor (CBOOT). It must be connected between CB and SW with a ≥0.15 µF ceramic capacitor to ensure sufficient gate-source voltage for low RDS(on) operation.
Does LM2840YMKX-ADJL/NOPB require external compensation components?
No - LM2840YMKX-ADJL/NOPB features fully internal compensation. No external Type-II or Type-III compensation network is needed; the control loop is factory-tuned for stability with standard external LC components.
LM2840YMKX-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:
- Obsolete
- 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:
- 100mA
- 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
LM2840YMKX-ADJL/NOPB FAQ
1.How can I place an order for LM2840YMKX-ADJL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2840YMKX-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 LM2840YMKX-ADJL/NOPB reliable?
The price and inventory of LM2840YMKX-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 LM2840YMKX-ADJL/NOPB is usually 5 days.
3.What payment methods are accepted for LM2840YMKX-ADJL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2840YMKX-ADJL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2840YMKX-ADJL/NOPB?
LM2840YMKX-ADJL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2840YMKX-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 LM2840YMKX-ADJL/NOPB?
For technical support, including LM2840YMKX-ADJL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2840YMKX-ADJL/NOPB requirements.
6.How does Aetrix verify that LM2840YMKX-ADJL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2840YMKX-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 LM2840YMKX-ADJL/NOPB meets industry standards.
7.What is the process for return or replacement of LM2840YMKX-ADJL/NOPB?
All LM2840YMKX-ADJL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2840YMKX-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 LM2840YMKX-ADJL/NOPB part is unused and in its original packaging.
Return procedure for LM2840YMKX-ADJL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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