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LT3470IDDB#TRMPBF - DC DC Switching Regulators

The LT3470IDDB#TRMPBF from Linear Technology is a DC-DC switching regulator that integrates a full-featured buck switch mode power supply (SMPS) for optimal control and a clean output current at a variety of input/output voltages. The devices feature a linear buffer topology, enabling the user to achieve accurate and fast regulation. Additionally, the topology ensures low noise and ripple, high efficiency and wide power supply range that can support both high-current and high-voltage applications.

The LT3470IDDB#TRMPBF is a complete step−down switching regulator solution with a peak current−mode P−channel buck switch, an internal 2.5A peak N−channel MOSFET for power switching, and a low−dropout linear regulator. It has an adjustable output voltage from 3V to 72V and an adjustable switching frequency from 150kHz to 3.2MHz.

Application Field

The LT3470IDDB#TRMPBF is suitable for a variety of DC-DC applications, including applications in telecom, automotive, industrial, medical, computing, and in power-sensitive consumer electronic applications. It is ideal for powering LEDs, big data servers, battery-charger systems, intelligent lighting, power over Ethernet (PoE), portable electronics, and other applications that require precise low-input voltage regulation.

The device is also suitable for general-purpose and battery-powered equipment. It offers high efficiency, low quiescent current, and low noise from an easy-to-use IC. Additionally, the device is designed to reduce long-term drift of the output voltage set-point.

Working Principle

The LT3470IDDB#TRMPBF integrates a synchronous step-down switching regulator and a linear regulator within a single IC. The synchronous step-down regulator consists of a p-channel MOSFET that operates in continuous conduction mode at maximum duty cycle. As the input voltage increases, the LT3470IDDB#TRMPBF pulls the gate voltage of the MOSFET higher, causing the MOSFET to switch more often, allowing more current to flow through the MOSFET and providing more output power. The linear regulator provides a precise voltage reference that ensures a clean and stable output, while the switching regulator provides the necessary current to maintain the output voltage.

The device operates at a fixed frequency of 1.6MHz and includes several features to achieve optimal efficiency and performance. These features include Cycle-by-Cycle Current Limit, Internal Soft-Start and External Soft-Start, Bidirectional Synchronous Rectification, Programmable Slew-Rate Control and Average Current Mode control.

The LT3470IDDB#TRMPBF also provides a set of protection features to protect the device from damage or malfunction. These features include output Under-Voltage Lockout (UVLO), input Over-Voltage Protection (OVP), Over-Current Limiting (OCL), Soft-Start Limiting, and Thermal Shutdown.

Conclusion

The LT3470IDDB#TRMPBF is a high-performance synchronous step-down DC-DC switching regulator IC that integrates a full-featured buck switch mode power supply (SMPS) for optimal control and a clean output current at a variety of input/output voltage. It is designed to provide accurate and fast regulation, low noise and ripple, high efficiency, and wide power supply range that can support both high-current and high-voltage applications. This makes it an ideal choice for a variety of DC-DC applications.

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