LT3505IDD#TRPBF

Introduction

The LT3505IDD#TRPBF is a monolithic synchronous multiple-output step-down DC/DC regulator that can provide up to 3A of output current. The device integrates many advanced features including an output voltage range from 0.675V to 5.5V, an adjustable switching frequency up to 400kHz, an adjustable current limit, an internal compensation network, a power-good output, and many other features. As a part of PMIC - Voltage Regulators - DC DC Switching Regulators, the LT3505IDD#TRPBF offers the ability to optimize performance, reduce total solution size, and realize cost savings in system components and operation.

Application Field

The LT3505IDD#TRPBF is designed for applications such as digital TVs, set-top boxes, portable devices, optical networks, industrial communications systems, and other consumer electronics that demand high power systems with small size and low cost. Their 0.5V logic operating voltage also means they are suitable for powering smaller controllers, ASICs, and other low voltage logic circuits in these applications.

The LT3505IDD#TRPBF is an ideal choice for applications where a minimum of output voltage ripple and tight line and load regulation is required. Its wide input voltage range and internal compensation network mean the LT3505IDD#TRPBF can maintain very low output voltage ripples in applications such as USB power, along with a fast transient response.

Working Principle

The LT3505IDD#TRPBF is a monolithic, synchronous step-down DC/DC regulator that generates multiple output voltages. It operates in an adjustable switching frequency range of 200kHz to 400kHz and achieves a typical efficiency of greater than 90%. Its input voltage range of 3.7V to 24V allows it to be used in a wide variety of battery-powered applications.

The LT3505IDD#TRPBF employs an internal synchronous rectifier to reduce losses and minimize external components. This rectifier arrangement allows the LT3505IDD#TRPBF to operate at a higher frequency with a smaller inductor and lower output capacitance. Additionally, the LT3505IDD#TRPBF integrates a power-good output and an adjustable soft-start for a rapid, easy-to-use startup process.

User-configurable features such as output voltage, switching frequency, and current limit allow the LT3505IDD#TRPBF to be customized for your application, further reducing component count, design time and cost. An adjustable internal compensation network enables the LT3505IDD#TRPBF to drive both ceramic and polymer output capacitors to achieve an ultra-low output voltage ripple.

Conclusion

The LT3505IDD#TRPBF is a multiple-output synchronous step-down regulator that offers adjustable output voltages, switching frequencies, and current limits. Its wide input voltage range, high efficiency, and adjustable internal compensation network allow it to be used in many battery-powered applications, providing a combination of flexibility, performance, and economy. As part of PMIC - Voltage Regulators - DC DC Switching Regulators, the LT3505IDD#TRPBF is an ideal choice for demanding high-power applications that demand both performance and cost-effectiveness.