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Texas Instruments LV2842XLVDDCR
- Part No.:
- LV2842XLVDDCR
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LV2842XLVDDCR.pdf
- Description:
- IC REG BUCK ADJ 600MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,996
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Product details
Overview
LV2842XLVDDCR from Texas Instruments is a non-synchronous step-down DC/DC regulator optimized for 600-mA continuous output current, operating from 4.5 V to 42 V input with fixed 550-kHz switching frequency and 0.765-V feedback reference voltage. It integrates a 0.9-Ω typical RDS(ON) power MOSFET and supports adjustable output via external resistor divider. Used in industrial distributed power and battery-powered instrumentation where compact size and wide VIN range are critical.
For engineers reviewing the LV2842XLVDDCR datasheet, LV2842XLVDDCR pinout, LV2842XLVDDCR application, or LV2842XLVDDCR equivalent, key selection criteria include verified 600-mA load capability, SOT-6L thermal performance (RθJA = 121°C/W), shutdown quiescent current (16 µA), internal soft-start implementation via SHDN pin, and compatibility with ceramic input/output capacitors and Schottky diodes.
Technical Context
The LV2842XLVDDCR implements current-mode PWM control with cycle-by-cycle overcurrent protection and thermal shutdown at 175°C. Its functional block includes an error amplifier referenced to 0.765 V, gate driver with CB/SW bootstrap architecture, UVLO (on at 3.7 V, off at 3.5 V), and dedicated SHDN logic that modulates current limit from 0 to full rating based on applied voltage.
It operates in continuous conduction mode with minimum ON-time of 100 ns and maximum duty cycle of 94% (X option), enabling stable regulation down to ~0.8 V output when VIN ≥ 4.5 V. The SOT-6L package supports PCB layout optimization through adjacent GND and SW pins and dedicated CB pin for bootstrap capacitor routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 42 V - supports direct connection to 12 V, 24 V, and 36 V industrial rails without pre-regulation. |
| Output Current | 600 mA continuous - validated by LM2842-specific current limit of 1.15 A (min) and thermal design margin up to 125°C junction. |
| Switching Frequency | 550 kHz - enables use of small 10–22 µH inductors and low-ESR ceramic capacitors while maintaining <100 mVpp output ripple. |
| Feedback Reference | 0.765 V - sets output voltage via resistor divider (e.g., 3.3 V with R1 = 3.4 kΩ, R2 = 1.02 kΩ). |
| RDS(ON) | 0.9 Ω typical - contributes to 85% typical efficiency at 12 VIN/3.3 VOUT/100 mA, reducing conduction loss in high-duty-cycle operation. |
| Shutdown IQ | 16 µA typical - allows ultra-low-power standby in portable equipment without external LDO sequencing. |
| Thermal Shutdown | 175°C engage / 155°C disengage - protects against sustained overload or poor heatsinking in enclosed enclosures. |
Pinout & Package
SOT-6L (DDC) package: 1.60 mm × 2.90 mm body, 0.95 mm height, gull-wing leads, RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CB | Bootstrap bias supply | Connects external 0.15 µF ceramic capacitor to SW; supplies gate drive voltage for internal high-side MOSFET. |
| 2 - GND | Power and signal ground | Primary return path for switch current, feedback network, and internal bias; must be low-impedance copper pour. |
| 3 - FB | Feedback input | Monitors output via resistor divider; 0.1 µA bias current requires R1+R2 ≤ 10 kΩ to avoid gain error. |
| 4 - SHDN | Logic-level enable/disable | Pull to GND disables regulator (16 µA IQ); pull ≥2.3 V enables; floating prohibited; RC network enables programmable soft-start. |
| 5 - VIN | Main power input | Accepts 4.5–42 V; requires local 2.2 µF X5R/X7R ceramic bypass capacitor within 5 mm of pin. |
| 6 - SW | Switch node output | Drives external inductor and Schottky diode; connects to CBOOT; high dv/dt node requiring tight loop area with GND and CIN. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated | Eliminates need for external compensation network - reduces BOM count and layout sensitivity to component tolerances. |
| Short-circuit protected | Current-limit foldback prevents thermal runaway during output short; limits peak switch current to 1.15 A (min) at room temperature. |
| Soft-start circuitry | Implemented via SHDN pin voltage ramp - avoids inrush current spikes into bulk capacitance without adding extra IC or timing capacitor. |
| Low-profile SOT-6L | 1.6 mm × 2.9 mm footprint - fits space-constrained designs such as handheld test gear and sensor nodes where QFN or SOIC are too large. |
| UVLO with hysteresis | Starts at 3.7 V, stops at 3.5 V - prevents erratic operation during brown-out conditions on 5 V or 12 V backup rails. |
Applications
| Industrial Sensor Node Power | Battery-Powered Handheld Instrument |
|---|---|
Use Scenario: Powers 3.3-V microcontroller, analog front-end, and wireless transceiver from 12–24 V field bus or Li-ion pack with variable state-of-charge. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3 V at up to 600 mA with 550-kHz switching to minimize EMI in mixed-signal environments. Use Value: Wide 4.5–42 V input accommodates degraded battery or fluctuating industrial rail; 16 µA shutdown IQ extends runtime in sleep modes. | Use Scenario: Supplies 5-V USB-peripheral interface and 3.3-V logic from single 7–42 V input in portable multimeter or oscilloscope probe. IC Role / Device Role / Timing Role: Non-isolated step-down converter with adjustable output; uses SHDN pin for controlled power-up sequencing of analog and digital subsystems. Use Value: SOT-6L package enables compact PCB layout; 0.765-V feedback reference allows precise output setting across temperature (±0.035 V over −40°C to 125°C). |
| Portable Media Player Core Supply | Distributed 24-V Industrial Power Rail |
Use Scenario: Generates 0.8-V core voltage for ARM Cortex-M processor and 3.3-V I/O rail from 4.5–12 V Li-poly battery in audio player. IC Role / Device Role / Timing Role: Adjustable buck regulator configured for low-VOUT using R1/R2 divider; leverages 100 ns minimum ON-time for stable 0.8-V output at 550 kHz. Use Value: Internal 0.9-Ω RDS(ON) sustains >80% efficiency at light loads; thermal shutdown prevents damage during accidental short-circuit during debug. | Use Scenario: Provides localized 5-V or 12-V supply for PLC I/O modules, motor drivers, or fieldbus transceivers from centralized 24-V distribution bus. IC Role / Device Role / Timing Role: Point-of-load regulator with robust 42-V absolute max rating; handles load dumps and surges common in factory automation wiring. Use Value: UVLO hysteresis (3.7 V/3.5 V) ensures clean start/stop during bus transients; 121°C/W RθJA enables natural convection cooling without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2842YLVDDCR | 1.25-MHz switching frequency vs. 550 kHz; identical 600-mA rating, same SOT-6L package and pinout. | Better suited for ultra-compact designs needing smaller inductors/capacitors; higher frequency increases light-load switching loss. | Select LM2842YLVDDCR when board space is constrained and EMI filtering can accommodate 1.25 MHz harmonics. |
| TPS54202DRCT | Synchronous buck (no external diode), 4.5–28 V input, 2-A output, 500-kHz default frequency, 1.5-mm × 2-mm WSON package. | Higher current, lower dropout, but requires external compensation and lacks SHDN-based soft-start; not drop-in compatible. | Choose TPS54202DRCT for higher efficiency above 300 mA or when synchronous rectification is mandatory for thermal budget. |
Compared with LM2842YLVDDCR, LV2842XLVDDCR offers lower EMI and better light-load efficiency at the cost of larger magnetics; versus TPS54202DRCT, it trades output current and integration for simpler design, proven reliability in harsh environments, and direct SHDN soft-start control.
Availability
LV2842XLVDDCR is available at Aetrix Electronics and suitable for industrial sensor nodes, battery-powered handheld instruments, and distributed 24-V power rails requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LV2842XLVDDCR 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.
The LM284x SIMPLE SWITCHER® product line was designed for ease-of-use in cost-sensitive, space-constrained DC/DC conversion applications requiring minimal external components and robust operation across wide input voltage ranges.
FAQ
What is the maximum output current supported by the LV2842XLVDDCR?
The LV2842XLVDDCR is rated for 600-mA continuous output current, validated by its LM2842-specific current limit specification of 1.15 A (minimum) and thermal design margin up to 125°C junction temperature. This rating assumes proper PCB copper area, ambient temperature ≤ 85°C, and recommended external components per TI's SNVS540K datasheet.
Does the LV2842XLVDDCR require an external Schottky diode?
Yes, the LV2842XLVDDCR requires an external Schottky diode (e.g., MA2YD26) connected between SW and GND. As a non-synchronous buck regulator, it relies on this diode for freewheeling current path during the low-side conduction phase. Diode breakdown voltage should exceed 1.25× maximum input voltage for safety margin.
How is output voltage adjusted on the LV2842XLVDDCR?
Output voltage on the LV2842XLVDDCR is adjusted using a resistor divider from VOUT to GND, connected to the FB pin. With a fixed 0.765-V internal reference, VOUT = 0.765 V × (1 + R1/R2). For example, 3.3 V output uses R1 = 3.4 kΩ and R2 = 1.02 kΩ. Resistor values must stay between 100 Ω and 10 kΩ to avoid bias current errors.
What is the purpose of the CB pin on the LV2842XLVDDCR?
CB (Charge Bootstrap) is the gate-drive bias supply pin for the internal high-side MOSFET. It must connect to a 0.15 µF or larger ceramic capacitor between CB and SW. This capacitor provides the voltage boost needed to fully enhance the internal switch during each ON cycle, ensuring low RDS(ON) and stable operation across input voltage range.
Can the LV2842XLVDDCR be used with input voltages below 4.5 V?
No, the LV2842XLVDDCR has a specified minimum input voltage of 4.5 V per its Recommended Operating Conditions. Below this, undervoltage lockout (UVLO) prevents startup, and internal gate drive may be insufficient to maintain low RDS(ON). Attempting operation below 4.5 V risks unstable regulation, excessive dropout, or failure to start.
LV2842XLVDDCR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 0.765V
- Voltage - Output (Max):
- 38.4V
- Current - Output:
- 600mA
- Frequency - Switching:
- 1.1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LV2842XLVDDCR FAQ
1.How can I place an order for LV2842XLVDDCR through Aetrix?
Please submit a Request for Quotation (RFQ) for LV2842XLVDDCR 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 LV2842XLVDDCR reliable?
The price and inventory of LV2842XLVDDCR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LV2842XLVDDCR is usually 5 days.
3.What payment methods are accepted for LV2842XLVDDCR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LV2842XLVDDCR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LV2842XLVDDCR?
LV2842XLVDDCR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LV2842XLVDDCR 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 LV2842XLVDDCR?
For technical support, including LV2842XLVDDCR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LV2842XLVDDCR requirements.
6.How does Aetrix verify that LV2842XLVDDCR is sourced from the original manufacturer or authorized distributors?
All LV2842XLVDDCR 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 LV2842XLVDDCR meets industry standards.
7.What is the process for return or replacement of LV2842XLVDDCR?
All LV2842XLVDDCR units undergo pre-shipment inspection (PSI). If there is an issue with LV2842XLVDDCR, 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 LV2842XLVDDCR part is unused and in its original packaging.
Return procedure for LV2842XLVDDCR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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