EVAL-LT3099-AZ Evaluation Board

Introduction

The EVAL-LT3099-AZ is an evaluation board from Analog Devices designed to demonstrate the performance of the LT3099 negative linear regulator. It provides a practical platform for testing a low-noise negative supply rail with strong power-supply rejection and integrated protection features.

Part Description

The board features the LT3099, a negative adjustable linear regulator intended for demanding analog power applications. It accepts input voltages from -3.8 V to -20 V and is configured to provide a resistor-programmed -3.32 V output.

Key characteristics include:

• Negative input operating range from -3.8 V to -20 V
• Resistor-programmed -3.32 V negative output
• Up to 1 A output-current capability
• Ultra-low output noise
• Ultra-high power-supply rejection ratio (PSRR)
• VIOC tracking support for improved regulation performance
• Programmable current limit
• Power-good monitoring functionality
• Built-in thermal protection
• Built-in overcurrent protection

As an evaluation board, the EVAL-LT3099-AZ helps engineers measure output noise, load regulation, transient response, current limiting, and power-good behavior before incorporating the LT3099 into a final circuit design.

Applications

Potential applications for the EVAL-LT3099-AZ include:

• Low-noise negative analog supply testing
• Precision operational amplifier power rails
• Data converter negative supply rails
• High-performance audio circuits
• RF and communications analog front ends
• Instrumentation and measurement equipment
• Sensor interface circuits
• Laboratory power-supply development
• Mixed-signal system prototypes
• Negative-bias supply evaluation

Industries

Industries that may use this evaluation board include:

• Test and measurement
• Industrial automation
• Telecommunications
• Medical electronics
• Aerospace and defense
• Automotive electronics
• Professional audio
• Semiconductor development
• Research and education
• Scientific instrumentation

Usage Ideas

1. Precision ADC Supply Prototype
   Use the board to evaluate a clean -3.32 V rail for a precision data-acquisition circuit, comparing converter noise performance with different input supply conditions.

2. Low-Noise Audio Preamp Rail
   Power the negative rail of an audio preamplifier or signal-conditioning stage and evaluate the regulator’s effect on hum, noise floor, and transient response.

3. Programmable Protection Test Bench
   Connect adjustable loads to test the LT3099’s programmable current limit, power-good indication, and thermal protection behavior under overload conditions.

Conclusion

The Analog Devices EVAL-LT3099-AZ provides a convenient development platform for evaluating the LT3099 negative linear regulator. Its low-noise performance, high PSRR, programmable current limiting, power-good capability, and integrated protection features make it well suited for developing reliable negative supply rails in precision analog, industrial, communications, and measurement systems.