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Texas Instruments LM2840YQMKX/NOPB
- Part No.:
- LM2840YQMKX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2840YQMKX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 100MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2840YQMKX/NOPB from Texas Instruments is a non-synchronous step-down DC/DC regulator in SOT-6L package, delivering up to 100 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-used in battery-powered instrumentation for compact, high-voltage rail conversion.
For engineers reviewing the LM2840YQMKX/NOPB datasheet, LM2840YQMKX/NOPB pinout, LM2840YQMKX/NOPB application, or LM2840YQMKX/NOPB equivalent, key selection criteria include shutdown quiescent current (16 µA), internal switch RDS(ON) (0.9 Ω), thermal/UVLO protection, soft-start via SHDN pin, and SOT-6L layout compatibility for space-constrained designs.
Technical Context
The LM2840YQMKX/NOPB implements current-mode PWM control with integrated high-side N-channel MOSFET, fixed 1.25-MHz oscillator, and internal compensation-enabling stable regulation without external loop components. Its gate-drive undervoltage lockout ensures reliable FET turn-on only when CB–SW bias exceeds 7 V.
Functional modes include continuous conduction operation, cycle-by-cycle current limiting modulated by SHDN pin voltage (0–2.3 V), and thermal shutdown activation at 175°C. Input UVLO engages below 3.7 V (on-threshold) and releases at 3.5 V (off-threshold), preventing erratic startup under marginal supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to 12/24/36-V industrial or automotive batteries without pre-regulation. |
| Output Current | 100 mA max - optimized for low-power microcontrollers, sensors, and analog front-ends in portable equipment. |
| Switching Frequency | 1.25 MHz - enables use of small 10–15-µH inductors and ceramic capacitors, reducing solution footprint vs. lower-frequency alternatives. |
| Feedback Reference | 0.765 V - sets output voltage via resistor divider (VOUT = 0.765 × (1 + R1/R2)), allowing adjustable outputs from 0.8 V to >36 V. |
| Shutdown IQ | 16 µA typical - minimizes battery drain during system sleep mode while retaining fast wake-up capability. |
| RDS(ON) | 0.9 Ω typical - delivers >85% efficiency at 12-V input / 3.3-V/100-mA output, reducing thermal load in sealed enclosures. |
| Min. ON-Time | 100 ns - supports high step-down ratios (e.g., 42 V → 3.3 V) without pulse-skipping instability at light loads. |
Pinout & Package
SOT-6L (DDC) package: 1.60 mm × 2.90 mm, low-profile surface-mount, thermally enhanced with exposed pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CB | Bootstrap capacitor connection | Provides gate drive voltage for internal high-side FET; requires 0.15-µF ceramic capacitor between CB and SW pins. |
| 2: GND | Power and signal ground | Common return path for VIN, SW, FB, and SHDN; must be low-impedance copper pour for EMI and thermal performance. |
| 3: FB | Feedback input | Monitors output voltage via resistor divider; 0.1-µA bias current enables use of 1–10-kΩ resistors without significant error. |
| 4: SHDN | Logic-level enable/disable | Pull to GND disables regulator (16-µA IQ); pull ≥2.3 V enables; floating prohibited-tie to VIN if unused. |
| 5: VIN | Main power input | Accepts 4.5–42 V; requires local 2.2-µF ceramic bypass capacitor to suppress high-frequency switching noise. |
| 6: SW | Switch node output | Drives external inductor and Schottky diode; connects to CBOOT capacitor and forms LC filter with COUT. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation network-reduces BOM count and design iteration time for standard buck topologies. |
| Soft-start via SHDN pin | RC network on SHDN pin modulates current limit during startup, controlling output rise time and limiting inrush into bulk capacitance. |
| Thermal shutdown | Auto-recovery at 155°C (disengage) after tripping at 175°C-prevents permanent damage during overload or poor heatsinking. |
| Short-circuit protection | Cycle-by-cycle current limiting prevents destructive peak currents during output shorts or excessive load transients. |
| Low-RDS(ON) switch | 0.9-Ω typical RDS(ON) reduces conduction loss, enabling >85% efficiency at full 100-mA load across wide input range. |
Applications
| Portable Hand-Held Instruments | Battery-Powered Sensors |
|---|---|
Use Scenario: Multifunction handheld meter powered by two 18650 Li-ion cells (6–8.4 V) requiring stable 3.3-V rail for MCU and ADC. IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated battery voltage to precision 3.3-V supply with tight load regulation. Use Value: 1.25-MHz switching enables <10-mm² total solution size; 16-µA shutdown IQ extends battery life during measurement standby. |
Use Scenario: Wireless environmental sensor node using CR2032 coin cell (2.0–3.0 V) boosted to 3.3 V, then regulated down to 1.8 V for ultra-low-power sensor interface. IC Role / Device Role / Timing Role: Secondary buck stage providing clean, low-noise 1.8-V supply from intermediate 3.3-V rail. Use Value: 0.765-V feedback reference allows accurate 1.8-V output with standard 1% resistor values; internal compensation simplifies layout in space-limited PCB. |
| Industrial Distributed Power | Portable Media Players |
Use Scenario: DIN-rail mounted PLC I/O module deriving 5-V logic supply from 24-V field bus, operating continuously in 70°C ambient. IC Role / Device Role / Timing Role: Point-of-load converter delivering isolated 5-V rail with thermal robustness and input transient tolerance. Use Value: 42-V absolute max input withstands 48-V surge events; thermal shutdown protects against enclosure overheating; SOT-6L aids convection cooling. |
Use Scenario: Flash memory card reader powered from USB 5-V bus, requiring 3.3-V supply for SDIO interface with minimal ripple. IC Role / Device Role / Timing Role: Efficient, low-noise DC/DC converter replacing linear regulator to extend battery runtime. Use Value: 85% typical efficiency at 100-mA load doubles runtime vs. LDO; 1.25-MHz operation pushes switching noise beyond audio band, reducing filtering complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2840XQMKX/NOPB | 550-kHz switching frequency (vs. 1.25 MHz); identical pinout, package, and 100-mA rating. | Better efficiency at medium loads (10–50 mA); larger inductor/capacitor required due to lower frequency. | Select X-version for higher efficiency at partial load; Y-version for smallest solution size and better light-load transient response. |
| TPS62840DLCR | 2.5-V to 6-V input; 1-µA shutdown IQ; 2-MHz switching; same SOT-563 package but different pinout. | Optimized for single-cell Li-ion (3.0–4.2 V); not suitable for >6-V inputs like automotive or industrial rails. | Choose TPS62840 only for sub-6-V battery systems where ultra-low IQ dominates; LM2840YQMKX/NOPB remains preferred for 12–42-V inputs. |
Compared with LM2840XQMKX/NOPB and TPS62840DLCR, the LM2840YQMKX/NOPB uniquely balances wide-input capability (4.5–42 V), 1.25-MHz compactness, and production-proven reliability in harsh environments-making it the optimal choice for industrial and automotive auxiliary rail generation where input voltage variability and board space are critical constraints.
Availability
LM2840YQMKX/NOPB is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial distributed power supplies, and portable media players requiring stable component supply with long-term manufacturability.
Supply support for LM2840YQMKX/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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM284x SIMPLE SWITCHER® product line was designed for ease-of-use in cost-sensitive, space-constrained DC/DC applications-emphasizing minimal external components, internal compensation, and robust protection for industrial, automotive, and portable equipment.
FAQ
What is the maximum input voltage rating for the LM2840YQMKX/NOPB?
The LM2840YQMKX/NOPB has an absolute maximum input voltage rating of 45 V, with recommended operating range from 4.5 V to 42 V. Operation above 42 V risks exceeding safe junction temperature or triggering internal protection circuits, so designs must ensure transient spikes remain within the 45-V absolute limit per the datasheet's Absolute Maximum Ratings table.
Does the LM2840YQMKX/NOPB require external compensation components?
No, the LM2840YQMKX/NOPB features internally compensated control loop architecture. This eliminates the need for external compensation networks (e.g., RC or capacitor-divider networks), reducing bill-of-materials count and simplifying PCB layout-confirmed in the "Features" section and "Detailed Description" of the official TI datasheet SNVS540K.
How does the SHDN pin function on the LM2840YQMKX/NOPB?
The SHDN pin on the LM2840YQMKX/NOPB is a logic-level enable input: pulling it to GND disables the regulator (reducing IQ to 16 µA), while applying ≥2.3 V enables normal operation. It must never float-TI specifies tying it to VIN if unused. Additionally, SHDN voltage modulates current limit for programmable soft-start, as detailed in Section 8.2.2.7 of the datasheet.
What is the typical efficiency of the LM2840YQMKX/NOPB at 12-V input and 3.3-V/100-mA output?
Per Figure 3 in the LM2840 datasheet (SNVS540K), the LM2840YQMKX/NOPB achieves approximately 85% typical efficiency at 12-V input, 3.3-V output, and 100-mA load. This value assumes standard external components (15-µH inductor, MA2YD26 Schottky diode, 2.2-µF CIN, 10-µF COUT) and room-temperature operation.
Is the LM2840YQMKX/NOPB pin-compatible with other LM284x variants?
Yes, the LM2840YQMKX/NOPB shares identical SOT-6L (DDC) pinout and package dimensions with LM2841YQMKX/NOPB and LM2842YQMKX/NOPB. However, output current ratings differ (100 mA vs. 300 mA vs. 600 mA), and current-limit thresholds vary-so direct substitution requires verification of load-current requirements and thermal margin in the target application.
LM2840YQMKX/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:
- 100mA
- Frequency - Switching:
- 1.25MHz
- 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
LM2840YQMKX/NOPB FAQ
1.How can I place an order for LM2840YQMKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2840YQMKX/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 LM2840YQMKX/NOPB reliable?
The price and inventory of LM2840YQMKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2840YQMKX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2840YQMKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2840YQMKX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2840YQMKX/NOPB?
LM2840YQMKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2840YQMKX/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 LM2840YQMKX/NOPB?
For technical support, including LM2840YQMKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2840YQMKX/NOPB requirements.
6.How does Aetrix verify that LM2840YQMKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2840YQMKX/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 LM2840YQMKX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2840YQMKX/NOPB?
All LM2840YQMKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2840YQMKX/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 LM2840YQMKX/NOPB part is unused and in its original packaging.
Return procedure for LM2840YQMKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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