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Texas Instruments LM2840XQMKX/NOPB
- Part No.:
- LM2840XQMKX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2840XQMKX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 100MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2840XQMKX/NOPB from Texas Instruments is a 100 mA, 4.5V–42V input, fixed-frequency PWM step-down DC/DC regulator in SOT-6L package, featuring 0.765 V feedback reference, 550 kHz switching frequency, and integrated 0.9 Ω high-side MOSFET - designed for battery-powered industrial sensors and portable instrumentation requiring compact, efficient power conversion.
For engineers reviewing the LM2840XQMKX/NOPB datasheet, LM2840XQMKX/NOPB pinout, LM2840XQMKX/NOPB application, or LM2840XQMKX/NOPB equivalent, key selection criteria include input voltage range (4.5–42 V), output current capability (≤100 mA), thermal performance in SOT-6L (RθJA = 121 °C/W), and soft-start implementation via SHDN pin with external RC network.
Technical Context
The LM2840XQMKX/NOPB implements current-mode PWM control with internal compensation, enabling stable regulation across wide input ranges without external loop components. Its 550 kHz fixed-frequency operation balances efficiency and component size, supporting ceramic output capacitors as small as 22 µF while maintaining low output ripple.
Protection architecture includes thermal shutdown (engages at ~175 °C), input UVLO (4.4 V turn-on, 3.5 V turn-off), gate-drive under-voltage lockout, and cycle-by-cycle current limiting (525–900 mA typical). Soft-start is implemented by modulating current limit via analog voltage on SHDN pin, allowing programmable ramp time without dedicated SS pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to automotive batteries, industrial 24 V rails, and unregulated solar/battery sources without pre-regulation. |
| Output Current | Up to 100 mA - optimized for low-power microcontrollers, analog sensors, and RF modules where peak load remains ≤100 mA. |
| Switching Frequency | 550 kHz - enables use of small 10–15 µH inductors and <100 µF ceramic output capacitors, reducing board area vs. lower-frequency alternatives. |
| Feedback Reference Voltage | 0.765 V ±18 mV - sets output voltage via resistor divider (VOUT = 0.765 V × (1 + R1/R2)), enabling precise adjustment from 0.8 V to >15 V. |
| Quiescent Current | 16 µA typical in shutdown - minimizes battery drain during system sleep modes in portable equipment. |
| Internal Switch RDS(ON) | 0.9 Ω typical - delivers ≥85% efficiency at 12 VIN/3.3 VOUT/50 mA, reducing heat generation in confined SOT-6L footprint. |
| Thermal Resistance | RθJA = 121 °C/W - requires minimal copper pour for thermal management in standard 2-layer PCBs per JEDEC 4-layer reference. |
Pinout & Package
SOT-6L package (Package Drawing DDC), 2.9 mm × 1.6 mm × 1.0 mm profile, thermally enhanced with exposed pad (not electrically connected). Pin 1 marked by notch or dot; pin numbering follows standard SOT-6L top-view sequence.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Provides gate drive voltage for internal high-side FET; requires 0.15 µF ceramic cap between CB and SW to sustain 0.9 Ω RDS(ON). |
| GND | Power and signal ground reference | Primary return path for switch current and feedback network; must connect directly to power ground plane near IC to minimize noise coupling. |
| FB | Feedback input | Senses output voltage via resistor divider; 0.1–1.0 µA bias current requires R1/R2 ≤10 kΩ to avoid error >0.5%. |
| SHDN | Logic-controlled enable/disable | Pull ≥2.3 V to enable; ≤0.9 V to disable (16 µA IQ); analog voltage modulation enables programmable soft-start ramp rate. |
| VIN | Main power input | Accepts 4.5–42 V; requires local 2.2 µF X5R/X7R ceramic bypass cap within 2 mm to suppress transients and reduce EMI. |
| SW | Switch node | Drives external inductor and catch diode; connects to CBOOT; exhibits fast-edge ringing requiring tight layout with short traces to L1/D1/COUT. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated current-mode control | Eliminates need for external compensation network - reduces BOM count and design iteration time for stable operation across 4.5–42 V input range. |
| Programmable soft-start via SHDN pin | RC network on SHDN pin modulates current limit from 0 to full scale, enabling controlled VOUT ramp without overshoot or inrush stress on input caps. |
| Short-circuit protected with cycle-by-cycle limiting | Clamps peak switch current to 525–900 mA, preventing damage during output faults while maintaining thermal safety in SOT-6L package. |
| Low shutdown quiescent current | 16 µA typical - extends battery life in always-on sensor nodes and IoT edge devices operating in deep-sleep states. |
| Integrated 0.9 Ω high-side MOSFET | Reduces external component count versus controller-only solutions; eliminates gate driver design complexity and layout sensitivity. |
Applications
| Industrial Sensor Node | Portable Medical Monitor |
|---|---|
|
Use Scenario: Powering ultra-low-power temperature/humidity sensor with MCU and BLE radio from a single 3.7 V Li-ion cell. IC Role / Device Role / Timing Role: Primary buck regulator generating stable 3.3 V rail for mixed-signal circuitry and RF interface. Use Value: 550 kHz switching enables compact 15 µH inductor and 47 µF ceramic output cap; 16 µA shutdown current preserves battery for multi-month operation. |
Use Scenario: Supplying 5 V to analog front-end and display driver in handheld ECG device powered by dual AA alkaline cells (1.8–3.2 V). IC Role / Device Role / Timing Role: Input-boosted buck converter accepting up to 42 V transient surges during battery insertion or ESD events. Use Value: 42 V absolute max input rating and built-in UVLO prevent malfunction during battery swap; 0.765 V FB allows precise 5.0 V output with ±1% tolerance. |
| Automotive Body Control Module | Test & Measurement Probe |
|
Use Scenario: Regulating 12 V vehicle battery down to 3.3 V for CAN transceiver and microcontroller in door module. IC Role / Device Role / Timing Role: Load-switch-capable DC/DC stage with thermal shutdown and input surge protection. Use Value: -40°C to +125°C junction rating ensures reliability in under-hood environments; 121 °C/W RθJA allows operation at full load without heatsink. |
Use Scenario: Providing clean, adjustable 0.8–15 V output for calibration of precision ADC references in benchtop multimeter. IC Role / Device Role / Timing Role: Programmable-output buck regulator with fine-resolution feedback divider support. Use Value: 0.765 V reference voltage enables accurate output setting (e.g., 0.8 V = R1/R2 = 0.047); 550 kHz frequency minimizes measurement noise coupling into sensitive analog paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2841XQMKX/NOPB | 300 mA output capability, identical 550 kHz frequency and 0.765 V FB, same SOT-6L package | Supports higher-current loads (e.g., motor drivers, multi-channel ADCs) without changing PCB layout | Select when load exceeds 100 mA but board space and thermal budget constrain upgrade to larger packages |
| LM2840YQMKX/NOPB | 1.25 MHz switching frequency, same 100 mA rating and 0.765 V FB, identical SOT-6L footprint | Enables smaller inductors (e.g., 4.7 µH) and reduced output capacitance for space-constrained wearables | Choose for designs prioritizing miniaturization over peak efficiency at light loads |
Compared with LM2840XQMKX/NOPB, LM2841XQMKX/NOPB provides 3× higher output current in identical form factor, while LM2840YQMKX/NOPB trades ~5% efficiency for 2.3× higher frequency to shrink passive components - both retain pin compatibility and feedback architecture.
Availability
LM2840XQMKX/NOPB is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, and automotive body control modules requiring stable component supply with long-term lifecycle assurance.
Supply support for LM2840XQMKX/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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency.
The LM2840 series belongs to TI's high-voltage DC/DC regulator product line, engineered for robust operation in harsh environments including automotive, industrial, and battery-powered systems with wide-input voltage requirements.
FAQ
What is the maximum input voltage rating for LM2840XQMKX/NOPB?
The LM2840XQMKX/NOPB has an absolute maximum input voltage rating of +45 V, with normal operation specified from 4.5 V to 42 V. Exceeding 42 V may trigger internal UVLO shutdown, while sustained operation above 45 V risks permanent damage to the VIN pin and internal switch.
Can LM2840XQMKX/NOPB be used to generate 0.8 V output?
Yes, LM2840XQMKX/NOPB supports 0.8 V output using the 0.765 V feedback reference: set R2 = 787 Ω and R1 = 30.9 Ω per TI's Figure 18 application circuit. Resistor values must remain within 100 Ω–10 kΩ to limit FB bias current error to <0.5%.
Does LM2840XQMKX/NOPB require an external bootstrap capacitor?
Yes, LM2840XQMKX/NOPB requires a minimum 0.15 µF ceramic capacitor between CB and SW pins to maintain sufficient gate drive voltage for the internal high-side MOSFET. TI recommends X7R dielectric with voltage rating ≥16 V for reliable operation across temperature.
How is soft-start implemented on LM2840XQMKX/NOPB?
Soft-start on LM2840XQMKX/NOPB is implemented by applying a rising voltage to the SHDN pin via an external RC network. As SHDN voltage increases from 0 V to 2.3 V, the internal current limit ramps from zero to full scale, controlling output voltage rise time and limiting inrush current without additional components.
What thermal derating applies to LM2840XQMKX/NOPB at 100 mA load?
At 100 mA output and 12 V input, LM2840XQMKX/NOPB dissipates ~120 mW. With RθJA = 121 °C/W, junction temperature rise is ~14.5 °C above ambient. Derating begins only above 110 °C ambient, where thermal shutdown (175 °C) provides margin before activation.
LM2840XQMKX/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:
- 550kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LM2840XQMKX/NOPB FAQ
1.How can I place an order for LM2840XQMKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2840XQMKX/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 LM2840XQMKX/NOPB reliable?
The price and inventory of LM2840XQMKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2840XQMKX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2840XQMKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2840XQMKX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2840XQMKX/NOPB?
LM2840XQMKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2840XQMKX/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 LM2840XQMKX/NOPB?
For technical support, including LM2840XQMKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2840XQMKX/NOPB requirements.
6.How does Aetrix verify that LM2840XQMKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2840XQMKX/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 LM2840XQMKX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2840XQMKX/NOPB?
All LM2840XQMKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2840XQMKX/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 LM2840XQMKX/NOPB part is unused and in its original packaging.
Return procedure for LM2840XQMKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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