LTC1504AIS8#TRPBF

PMIC - Voltage Regulators - DC DC Switching Regulators

The LTC1504AIS8#TRPBF is a high performance, 3- phase DC/DC converter controller with integrated phase leg current sensing, active phase leg balancing and short circuit protection. This device utilizes an architecture that combines the advantages of constant frequency, spreading frequency and current mode techniques. It also features low noise pulse width modulation (PWM), low output ripple, no minimum load requirement and cycle-by-cycle current limiting.

The LTC1504AIS8#TRPBF is suited for a wide range of applications from consumer electronics to automotive and industrial power supplies. It can be combined with external MOSFETs to create an efficient and cost-effective solutions for DC/DC buck and boost topologies. The LTC1504AIS8#TRPBF can be synchronized to an external clock, making it suitable for applications that require precise switching frequency such as interference sensitive applications.

Application Field

The LTC1504AIS8#TRPBF can be used in a variety of applications including:

• DC/DC buck and boost converters
• High current power supplies
• Switched-mode power supplies
• Automotive power modules
• Defibrillators
• Server power supplies
• Industrial power systems

Working Principle

The LTC1504AIS8#TRPBF utilizes a unique architecture that combines three techniques for maximum efficiency. The constant frequency (CF) technique enables constant frequency and precise time control, while spreading frequency (SF) modulation provides a noiseless running at light loads, allowing for higher efficiency and superior regulation over the full load range. The current mode (CM) technique provides fast line and load step responses with excellent line and load regulation.

The LTC1504AIS8#TRPBF has an integrated current-sense stage which allows precise-current control and flexible loop compensation. This feature improves transient response and reduces the component count of the design by eliminating the need of external current sensing components. The LTC1504AIS8#TRPBF also features active-leg balancing with active peak current-limiting and a dedicated fault line, allowing multiple controller and three-phase load sharing.

The LTC1504AIS8#TRPBF features a low noise pulse width modulation (PWM) system, allowing for high efficiency, low output ripple and no minimum load requirements. The switching frequencies can be adjusted externally and synchronized to a clock for high frequency operation. The internal safety shutdown and short circuit protection provides further assurance for the design.

Conclusion

The LTC1504AIS8#TRPBF is a high-performance 3-phase DC/DC converter controller that combines the advantages of constant frequency, spreading frequency and current mode techniques. This device is designed to meet the requirements of a wide range of applications ranging from consumer electronics to automotive and industrial power supplies. The LTC1504AIS8#TRPBF has an integrated current-sense stage which eliminates the need of external current-sensing components, while its low noise PWM system offers high efficiency and no minimum load requirements. Its internal safety shutdown and short circuit protection provide further assurance for the design.