LT3487EDD#TRPBF

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LT3487EDD#TRPBF Application Field and Working Principle

The LT3487EDD#TRPBF is a very efficient step-down power regulator from Linear Technology. It is a DC-DC buck converter incorporating a low R_ds(on) switch, enabling a supply current up to 5A and a very small, lightweight package. It is suitable for a wide range of applications including MIL-STD-461E, military RF, and EMI sensitive systems, making it perfect for use in demanding high power and low noise environment.

Overview

The LT3487EDD#TRPBF is designed to provide high efficiency even at low load currents. It utilizes an adaptive on-time control architecture to maximize efficiency while minimizing switching losses. This solution offers excellent load and line transient response, low output ripple, and wide input range. It also offers a high peak current mode to ensure a fast load step response.

Key Features

• Wide 2.3V to 28V Input Voltage Range

• Output Voltage Range from 0.6V to 12V

• High Efficiency of up to 95%, Lowering Thermal Stress

• Minimum Shutdown Current of 1µA

• Excellent Load and Line Transient Response

• Wide Operating Temperature Range from -40°C to 125°C

Applications

• High Efficiency DC-DC Power Conversion

• Wide Applicable Input Voltage Range

• Overvoltage and Undervoltage Protection

• Long Battery Operation

• Communications Systems

• Medical Equipment & Industrial Equipment

Working Principle

The LT3487EDD#TRPBF is built around patented on-time and power-tracking control techniques. At the start of each cycle, the on-time for the switch is determined by an internal oscillator and a comparator circuit with a reference voltage derived from the output voltage and the external feedback resistor ratio. The switch is then turned on and the output voltage is monitored by the power-tracking comparator. As the input voltage rises, the switch on-time is automatically reduced, increasing efficiency. This process is repeated until the desired output voltage is achieved.

Conclusion

The LT3487EDD#TRPBF is a very efficient switching regulator, ideal for applications where space and power dissipation are at a premium. It also offers excellent load and line transient response and wide input voltage, making it suitable for a range of demanding applications.

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