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Texas Instruments LM2840YQMK/NOPB
- Part No.:
- LM2840YQMK/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2840YQMK/NOPB.pdf
- Description:
- IC REG BUCK ADJ 100MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:867
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Product details
Overview
LM2840YQMK/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, 1.25-MHz fixed switching frequency, and 4.5-V to 42-V input range-designed for compact power conversion in battery-powered instrumentation.
For engineers reviewing the LM2840YQMK/NOPB datasheet, LM2840YQMK/NOPB pinout, LM2840YQMK/NOPB application, or LM2840YQMK/NOPB equivalent, key selection criteria include its 1.25-MHz Y-option frequency enabling small external components, 16-µA shutdown quiescent current, internal 0.9-Ω MOSFET switch, thermal/UVLO protection, and adjustable output via FB pin.
Technical Context
The LM2840YQMK/NOPB implements current-mode PWM control with integrated high-side N-channel MOSFET and gate-driver bias (CB) circuitry. Its functional block includes error amplifier, oscillator, PWM comparator, soft-start timer, and dedicated protection comparators for thermal shutdown, VIN undervoltage lockout, and CB undervoltage lockout.
It operates in continuous conduction mode with minimum ON-time of 100 ns and maximum duty cycle of 87%, supporting output voltage adjustment from 0.765 V upward using an external resistor divider on the FB pin. The SHDN pin enables logic-controlled enable/disable with 1-V turn-on threshold and 0.9-V turn-off threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide-input industrial and automotive battery systems without pre-regulation |
| Output Current | Up to 100 mA - optimized for low-power loads such as sensors, microcontrollers, and RF modules |
| Switching Frequency | 1.25 MHz (Y option) - enables use of sub-10-µH inductors and <100-µF ceramic output capacitors |
| Feedback Reference | 0.765 V ±1.5% - sets precise output voltage with standard resistor divider; enables outputs down to 0.765 V |
| Quiescent Current | 16 µA typical in shutdown - minimizes battery drain during system sleep modes |
| Switch RDS(on) | 0.9 Ω typical - delivers >85% typical efficiency at 12-V input / 3.3-V output / 100-mA load |
| Protection Features | Thermal shutdown (175°C), VIN UVLO (3.7-V turn-on), CB UVLO, short-circuit current limiting - ensures robust operation under fault conditions |
Pinout & Package
SOT-6L (DDC) package: 1.60 mm × 2.90 mm body size, low-profile surface-mount footprint compatible with automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CB | Bootstrap bias supply | Provides gate-drive voltage for internal high-side MOSFET; requires 0.15-µF ceramic capacitor between CB and SW |
| 2 - GND | Power and signal ground | Common return path for VIN, SW, FB, SHDN, and CB; must be low-impedance connection to minimize noise and thermal rise |
| 3 - FB | Feedback input | Monitors output voltage via resistor divider; regulates VOUT = 0.765 V × (1 + R1/R2); bias current <1 µA enables high-resistor values |
| 4 - SHDN | Logic-enable input | Active-high shutdown control: <0.9 V disables regulator (16-µA IQ); >2.3 V enables; must not float; tie to VIN if unused |
| 5 - VIN | Main power input | Accepts 4.5–42 V DC; requires local 2.2-µF ceramic input capacitor (X5R/X7R) placed near pin for transient suppression |
| 6 - SW | Switch node output | Drives external inductor and Schottky diode; connects to CBOOT capacitor; carries pulsed high-current switching waveform |
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 network on SHDN modulates current limit during startup - controls output rise time and limits inrush into COUT |
| Fixed-frequency PWM | 1.25-MHz operation ensures predictable EMI profile and simplifies filter design versus variable-frequency alternatives |
| Low-RDS(on) integrated switch | 0.9-Ω typical RDS(on) minimizes conduction loss - critical for efficiency in 5–24-V input ranges with light-to-moderate loads |
| Small solution size | SOT-6L package + minimal external parts (6 components typical) achieves <25-mm² total PCB area for 3.3-V/100-mA design |
Applications
| Portable Hand-Held Instruments | Battery-Powered Sensors |
|---|---|
|
Use Scenario: Multifunction handheld meter powered by two alkaline cells (2.4–3.2 V) with boost converter feeding LM2840YQMK/NOPB to generate stable 3.3 V for MCU and ADC. IC Role / Device Role / Timing Role: Primary step-down regulator providing regulated 3.3-V rail; handles input transients during battery discharge and load steps. Use Value: 16-µA shutdown current extends shelf life; 1.25-MHz switching allows ultra-compact 10-µH inductor and 22-µF ceramic output cap. |
Use Scenario: Wireless environmental sensor node using Li-SOCl₂ primary cell (3.6 V) with 10-year deployment target, requiring ultra-low IQ regulation. IC Role / Device Role / Timing Role: Always-on power supply for low-duty-cycle sensor and BLE radio; enabled only during measurement bursts via SHDN pin. Use Value: 16-µA shutdown IQ prevents measurable battery depletion during 99.9% sleep time; FB pin accuracy ensures consistent ADC reference. |
| Industrial Distributed Power | Portable Media Players |
|
Use Scenario: DIN-rail mounted I/O module receiving 24-V DC field power, stepping down to 5 V for isolated digital interfaces and 3.3 V for microcontroller. IC Role / Device Role / Timing Role: Secondary non-isolated buck stage after front-end protection; withstands 42-V surges per IEC 61000-4-5. Use Value: 42-V absolute max input rating and thermal shutdown protect against overvoltage faults; SOT-6L enables dense multi-rail layouts. |
Use Scenario: Portable audio player with single-cell Li-ion (3.0–4.2 V) powering analog audio amp (5 V) and digital SoC (1.2 V), where LM2840YQMK/NOPB supplies 5 V. IC Role / Device Role / Timing Role: High-efficiency intermediate rail generator; operates across full battery voltage range without dropout. Use Value: 0.9-Ω RDS(on) maintains >88% efficiency at 3.6-V input/5-V output/100-mA load; 1.25-MHz frequency avoids audible noise in speaker drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2840XQMK/NOPB | 550-kHz X-option switching frequency vs. 1.25-MHz Y-option; identical pinout, package, and FB voltage | Better efficiency at medium loads due to lower switching loss; requires larger inductor (≥22 µH) and higher-output-capacitance (≥47 µF) | Select X-option when prioritizing efficiency over board space; select Y-option (LM2840YQMK/NOPB) when minimizing solution size is critical |
| TPS62840DRVR | 2.5-V to 6-V input range, 1.8-V to 5.5-V output, 1-µA IQ in shutdown, 2.2-MHz switching - narrower VIN but ultra-low IQ | Optimized for single-cell Li-ion or coin-cell applications; not suitable for 12–42-V industrial inputs | Choose TPS62840DRVR only for sub-6-V battery systems requiring nanoscale IQ; LM2840YQMK/NOPB remains preferred for wide-input legacy designs |
Compared with LM2840XQMK/NOPB, LM2840YQMK/NOPB trades higher switching loss for dramatically smaller passive components and faster transient response; versus TPS62840DRVR, it sacrifices ultra-low IQ for 4.5–42-V operational flexibility and proven ruggedness in harsh environments.
Availability
LM2840YQMK/NOPB is available at Aetrix Electronics and suitable for portable hand-held instruments, battery-powered sensors, and industrial distributed power applications requiring stable component supply, long-lifecycle support, and automotive-grade reliability screening.
Supply support for LM2840YQMK/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, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets since 1930.
The LM284x family-including LM2840YQMK/NOPB-is part of TI's SIMPLE SWITCHER® portfolio, designed specifically for ease-of-use, minimal external component count, and robust operation in cost-sensitive, space-constrained DC/DC conversion applications.
FAQ
What is the switching frequency of LM2840YQMK/NOPB?
The LM2840YQMK/NOPB operates at a fixed 1.25-MHz switching frequency, designated by the "Y" suffix in the part number. This high-frequency operation allows use of small-value inductors (e.g., 10 µH) and ceramic output capacitors (e.g., 22 µF), reducing overall solution size compared to lower-frequency alternatives like the 550-kHz LM2840XQMK/NOPB.
How do I set the output voltage for LM2840YQMK/NOPB?
The output voltage of LM2840YQMK/NOPB is set using a resistor divider from VOUT to GND, with the midpoint connected to the FB pin. Since the FB reference voltage is 0.765 V, VOUT = 0.765 V × (1 + R1/R2). For example, to achieve 3.3 V, use R2 = 1.02 kΩ and R1 = 3.4 kΩ. Resistor values should remain between 100 Ω and 10 kΩ to avoid bias current errors.
What is the maximum output current capability of LM2840YQMK/NOPB?
The LM2840YQMK/NOPB is rated for up to 100 mA DC output current. Its internal switch current limit is 525 mA (typical) at room temperature, increasing to 900 mA over temperature. This headroom supports brief load transients while maintaining regulation, but sustained loads above 100 mA risk thermal shutdown in standard PCB layouts without added copper area.
Does LM2840YQMK/NOPB require an external bootstrap capacitor?
Yes, LM2840YQMK/NOPB requires a bootstrap capacitor (CBOOT) between the CB and SW pins. A 0.15-µF ceramic capacitor is recommended; for input voltages less than twice the output voltage, use 0.15–1 µF to ensure sufficient gate drive and maintain low RDS(on). This capacitor is essential for charging the internal high-side MOSFET gate during each switching cycle.
Can LM2840YQMK/NOPB be used in automotive applications?
The LM2840YQMK/NOPB is qualified per AEC-Q100 Grade 1 (–40°C to +125°C) and specified for operation across that junction temperature range. It includes automotive-grade protections including thermal shutdown, input UVLO, and CB UVLO. While not marketed as a dedicated automotive part, its electrical specs and qualification make it suitable for under-hood and infotainment power rails where 4.5–42-V input and 100-mA output meet system requirements.
LM2840YQMK/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
LM2840YQMK/NOPB FAQ
1.How can I place an order for LM2840YQMK/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2840YQMK/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 LM2840YQMK/NOPB reliable?
The price and inventory of LM2840YQMK/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2840YQMK/NOPB is usually 5 days.
3.What payment methods are accepted for LM2840YQMK/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2840YQMK/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2840YQMK/NOPB?
LM2840YQMK/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2840YQMK/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 LM2840YQMK/NOPB?
For technical support, including LM2840YQMK/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2840YQMK/NOPB requirements.
6.How does Aetrix verify that LM2840YQMK/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2840YQMK/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 LM2840YQMK/NOPB meets industry standards.
7.What is the process for return or replacement of LM2840YQMK/NOPB?
All LM2840YQMK/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2840YQMK/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 LM2840YQMK/NOPB part is unused and in its original packaging.
Return procedure for LM2840YQMK/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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