LT3042EMSE#PBF

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The LT3042EMSE#PBF is a low dropout linear regulator from Analog Devices Inc. It delivers an output current of 200mA with a typical dropout voltage of 350mV at full load. The device operates within an input voltage range of 1.8V to 20V and supports an adjustable output voltage range from 0V to 15V. Key electrical specifications include an operating quiescent current of nominally 2mA, which reduces to less than 1µA in shutdown mode. The regulator features ultralow noise performance, characterized by 0.8µVRMS integrated noise (10Hz to 100kHz) and 2nV/√Hz spot noise at 10kHz. It provides high power supply ripple rejection, achieving 79dB at 1MHz. The component utilizes a precision 100µA SET pin current for single-resistor voltage programming and includes built-in protections such as reverse battery protection, reverse current protection, internal current limit with foldback, and thermal limit with hysteresis.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Ultralow noise architecture designed for powering noise-sensitive RF applications
• Programmable current limit and fast start-up capability via external components
• Built-in reverse battery and reverse current protection mechanisms
• Unity-gain operation providing constant noise and PSRR independent of output voltage

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• RF Power Supplies: PLLs, VCOs, Mixers, LNAs
• Very Low Noise Instrumentation
• High Speed/High Precision Data Converters
• Medical Applications: Imaging, Diagnostics
• Post-Regulator for Switching Supplies

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix #PBF indicates lead-free finish and tube packaging when ordering discrete units. Confirm the EMSE package designation corresponds to the 10-Lead Plastic MSOP form factor required for your PCB layout. Ensure the E-grade temperature range of –40°C to 125°C meets your operational environment requirements. Cross-reference the manufacturer part number with authorized distributors to ensure authenticity and traceability.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this regulator for applications requiring ultra-low noise and high PSRR in a compact surface-mount package. The 200mA output current suits moderate power needs while maintaining excellent line and load regulation. Consider the 10-Lead MSOP package for thermal management and ease of assembly. Verify that the minimum 4.7µF ceramic output capacitor requirement fits within your design constraints. Evaluate the programmable features against system complexity requirements.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

The LT3042 belongs to Analog Devices' family of high-performance low dropout linear regulators. It is distinguished by its unique architecture combining a precision current reference with a high-performance voltage buffer. This design allows for easy paralleling to reduce noise further or increase output current. The device is positioned for demanding analog and RF circuits where signal integrity is critical.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

LT3042EDD#PBF offers the same electrical specifications in a 10-Lead DFN package.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

How is the output voltage programmed on the LT3042?

The output voltage is set using a single resistor connected between the SET pin and GND. The device sources a precise 100µA current through this resistor, determining the output voltage according to the formula VOUT = ISET × RSET.

What protection features are included in the LT3042?

The LT3042 includes reverse battery protection, reverse current protection, internal current limit with foldback, and thermal limit with hysteresis to safeguard both the device and the load under fault conditions.