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Texas Instruments LM2840YMK-ADJL/NOPB
- Part No.:
- LM2840YMK-ADJL/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2840YMK-ADJL/NOPB.pdf
- Description:
- IC REG BUCK ADJ 100MA TSOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2840YMK-ADJL/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 (Y option), and 4.5-V to 42-V input range. It integrates a 0.9-Ω typical RDS(ON) power switch and supports adjustable output voltage via external resistor divider - used in battery-powered instrumentation requiring compact, efficient local regulation.
For engineers reviewing the LM2840YMK-ADJL/NOPB datasheet, LM2840YMK-ADJL/NOPB pinout, LM2840YMK-ADJL/NOPB application, or LM2840YMK-ADJL/NOPB equivalent, key selection criteria include its 1.25-MHz operation enabling small external components, 16-µA shutdown quiescent current for low-power standby, thermal/UVLO protection, and compatibility with standard ceramic input/output capacitors and Schottky diodes.
Technical Context
The LM2840YMK-ADJL/NOPB implements current-mode PWM control with internal compensation, fixed 1.25-MHz oscillator, and cycle-by-cycle current limiting. Its functional block includes error amplifier, bandgap reference, soft-start circuitry tied to SHDN pin, gate driver with CB/SW bootstrap architecture, and dedicated UVLO (3.7-V turn-on) and thermal shutdown (175°C trip) comparators.
It operates in continuous conduction mode with minimum ON-time of 100 ns and maximum duty cycle of 87%, supporting output voltages as low as 0.8 V (via FB divider) and as high as 40 V (limited by VIN–VOUT differential). The CB pin supplies gate bias to the internal N-channel MOSFET, requiring a 0.15-µF ceramic bootstrap capacitor between CB and SW.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports wide industrial and automotive battery inputs without pre-regulation |
| Output Current | Up to 100 mA - optimized for low-power microcontrollers, sensors, and analog front-ends |
| Switching Frequency | 1.25 MHz - enables use of sub-22-µH inductors and <100-µF ceramic output capacitors |
| Feedback Reference Voltage | 0.765 V ±1.5% - sets output accuracy and allows precise resistor-divider-based adjustment |
| RDS(ON) | 0.9 Ω typical - minimizes conduction loss at light-to-moderate loads, improving efficiency above 85% |
| Shutdown Quiescent Current | 16 µA typical - extends battery life in always-on systems with periodic wake-up cycles |
| Thermal Shutdown Threshold | 175°C typical - protects against sustained overload or poor PCB thermal design |
Pinout & Package
LM2840YMK-ADJL/NOPB uses the DDC (SOT-6L) 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 |
|---|---|---|
| CB | Bootstrap supply | Provides gate drive voltage for internal N-MOSFET; requires 0.15-µF ceramic cap to SW |
| GND | Power ground | Reference node for all internal circuits and external feedback divider; must be low-impedance |
| FB | Feedback input | Senses output voltage via resistor divider; 0.765-V threshold determines VOUT = 0.765×(1+R1/R2) |
| SHDN | Enable/disable control | Logic-level input: ≥2.3 V enables, ≤0.3 V disables; tie to VIN if unused - never float |
| VIN | Main power input | Accepts 4.5–42 V; bypass with 2.2-µF ceramic capacitor close to pin for EMI suppression |
| SW | Switch node | Drives external inductor and Schottky diode; connects to CBOOT and L1; high dv/dt node requiring tight layout |
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-controlled ramp limits inrush current; avoids output overshoot and input rail sag during power-up |
| Short-circuit protected | Cycle-by-cycle current limit prevents damage during output short or excessive load transients |
| Low-RDS(ON) switch | 0.9-Ω typical RDS(ON) sustains >85% efficiency at 100 mA, reducing thermal stress on SOT-6L package |
| Thermal & UVLO protection | Independent shutdown triggers at 175°C junction temp and <3.5 V input - ensures safe start-up and fault recovery |
Applications
| Battery-Powered Handheld Instruments | Industrial Sensor Node Power |
|---|---|
Use Scenario: Portable multimeter or data logger powered by 9-V alkaline or 2-cell Li-ion battery (6–8.4 V). IC Role / Device Role / Timing Role: Primary step-down regulator generating stable 3.3-V rail for MCU, ADC, and display driver. Use Value: 1.25-MHz operation allows 10-µH inductor and 22-µF ceramic output cap - minimizing solution size below 25 mm². | Use Scenario: Wireless temperature/humidity sensor node deployed in factory environment with 24-V DC supply. IC Role / Device Role / Timing Role: Local point-of-load converter delivering 5-V or 3.3-V to RF transceiver and analog signal chain. Use Value: 42-V max input withstands industrial transients; 16-µA shutdown IQ extends battery life in sleep-wake cycles. |
| Portable Media Player Core Supply | Automotive Body Control Module Sub-Regulator |
Use Scenario: MP3 player using single-cell Li-ion (3.0–4.2 V) with boost converter feeding LM2840YMK-ADJL/NOPB for 1.8-V DSP core. IC Role / Device Role / Timing Role: Secondary buck regulator providing clean, low-noise 1.8-V supply with fast transient response. Use Value: 0.765-V FB reference enables accurate low-voltage setting; current-mode control delivers <50-µs load-step recovery. | Use Scenario: BCM sub-system requiring isolated 5-V rail from vehicle 12-V battery (9–16 V nominal, up to 42 V load dump). IC Role / Device Role / Timing Role: Non-isolated buck regulator powering CAN transceiver and microcontroller peripherals. Use Value: UVLO (3.7 V turn-on) prevents brownout operation; thermal shutdown protects during under-hood ambient rise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2840XMK-ADJL/NOPB | 550-kHz switching frequency (X option), higher minimum ON-time (100 ns vs. 100 ns same), identical pinout and FB voltage | Better efficiency at medium loads (>30 mA); larger inductor/capacitor required vs. Y option | Select X variant when lower EMI or higher efficiency at 12–24 V input dominates over board space |
| TPS62840DRVR | 2.5-V to 6-V input, 1.8-µA IQ in shutdown, 2-MHz sync buck, different pinout and package (1.2-mm × 0.8-mm WSON) | Not suitable for >6-V input; superior ultra-low-IQ performance but narrower voltage range | Choose TPS62840 only for coin-cell or single-LiFePO₄ applications where <2-µA shutdown IQ is critical |
Compared with LM2840XMK-ADJL/NOPB, the LM2840YMK-ADJL/NOPB trades slightly higher switching loss for significantly smaller passive components; versus TPS62840DRVR, it offers 7× wider input range but lacks ultra-low-IQ capability - making it optimal for industrial 9–42-V systems needing compact 100-mA regulation.
Availability
LM2840YMK-ADJL/NOPB is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial sensor nodes, portable media players, and automotive body control modules requiring stable component supply across extended temperature and input voltage ranges.
Supply support for LM2840YMK-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 consumer markets.
The LM284x family belongs to TI's SIMPLE SWITCHER® portfolio - engineered for ease-of-use in cost-sensitive, space-constrained DC/DC conversion applications where minimal external components and robust protection are essential.
FAQ
What is the maximum output current supported by the LM2840YMK-ADJL/NOPB?
The LM2840YMK-ADJL/NOPB is rated for up to 100 mA DC output current. This is confirmed in the device description and electrical characteristics table, where the LM2840 variant is explicitly specified for 100-mA operation - distinct from the LM2841 (300 mA) and LM2842 (600 mA). Peak switch current limit is 525 mA (typical), ensuring safe startup and transient handling within this rating.
Does the LM2840YMK-ADJL/NOPB require an external compensation network?
No, the LM2840YMK-ADJL/NOPB features internal compensation. As stated in the Features section and Detailed Description, it is "internally compensated," eliminating the need for external Type-II or Type-III compensation components. This simplifies design, reduces bill-of-materials count, and improves stability across operating conditions without requiring loop analysis.
How is the output voltage set on the LM2840YMK-ADJL/NOPB?
The output voltage of the LM2840YMK-ADJL/NOPB is set using a resistor divider connected between VOUT, FB, and GND. With a fixed 0.765-V feedback reference voltage, VOUT = 0.765 V × (1 + R1/R2). R2 is typically selected between 100 Ω and 10 kΩ; R1 is calculated accordingly. This configuration is validated in all typical application circuits shown in the datasheet, including 3.3-V, 5-V, and 0.8-V designs.
What package type does the LM2840YMK-ADJL/NOPB use, and what are its dimensions?
The LM2840YMK-ADJL/NOPB uses the DDC package - a 6-pin SOT-6L variant measuring 1.60 mm × 2.90 mm (nominal body size) with low profile. This is documented in the Device Information table and Pin Configuration section. The package includes an exposed thermal pad (non-electrical) to enhance power dissipation in the thermally constrained SOT footprint.
Can the LM2840YMK-ADJL/NOPB operate with input voltages below 4.5 V?
No - the absolute minimum recommended input voltage is 4.5 V, and the undervoltage lockout (UVLO) turns the device off below ~3.5 V (off-threshold). Operation below 4.5 V violates Recommended Operating Conditions and risks unstable regulation or failure to start. The 4.5–42 V range is strictly enforced by internal UVLO circuitry, as verified in Section 6.3 and Figure 5 of the datasheet.
LM2840YMK-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:
- 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
LM2840YMK-ADJL/NOPB FAQ
1.How can I place an order for LM2840YMK-ADJL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2840YMK-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 LM2840YMK-ADJL/NOPB reliable?
The price and inventory of LM2840YMK-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 LM2840YMK-ADJL/NOPB is usually 5 days.
3.What payment methods are accepted for LM2840YMK-ADJL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2840YMK-ADJL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2840YMK-ADJL/NOPB?
LM2840YMK-ADJL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2840YMK-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 LM2840YMK-ADJL/NOPB?
For technical support, including LM2840YMK-ADJL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2840YMK-ADJL/NOPB requirements.
6.How does Aetrix verify that LM2840YMK-ADJL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2840YMK-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 LM2840YMK-ADJL/NOPB meets industry standards.
7.What is the process for return or replacement of LM2840YMK-ADJL/NOPB?
All LM2840YMK-ADJL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2840YMK-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 LM2840YMK-ADJL/NOPB part is unused and in its original packaging.
Return procedure for LM2840YMK-ADJL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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