LTC3115IDHD-2#PBF

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The LTC3115IDHD-2#PBF (hereafter referred to as the ‘LTC3115’) is a PMIC (power management integrated circuit) voltage regulator from LT (Linear Technology) specifically designed to provide a high efficiency DC-DC switching regulator to regulate output voltage. In addition, it can operate in both two stage (i.e., boost and buck-boost) or three stage (boost, buck-boost, and buck) configurations. This makes the LTC3115 a versatile and effective voltage regulator for a variety of applications in both consumer and industrial settings.

Applications

The LTC3115’s applications range widely and include powering with minimum wasted energy anything from a standard five-volt logic-level power supply up to a 5.8V battery. It is used widely in consumer electronics such as cell phones, portable media players, GPS receivers, and remote controls, in addition to industrial applications including control systems, lighting, and motor control.

It can also be configured to power systems in battery-backup or dual-power operation. Battery-backup systems use the LTC3115 to provide low-loss transition from battery mode to AC power mode and vice versa, providing a reliable and consistent source of power. Dual-power systems utilize the LTC3115 in both a battery-backup and a secondary power-only configuration and a variety of different programs can be used for different applications. This helps to provide reliable, efficient power for a number of applications.

Working Principle

The LTC3115 efficiently converts input power into the appropriate output voltage through the use of a constant on-time, hysteretic-style, single-ended buck-boost switching regulator. It is designed to operate across a wide input voltage range, from 1.8V up to 6V and can provide a regulated output up to 5.8V.

The LTC3115 is controlled by an internally generated sawtooth oscillator with a frequency of approximately 400kHz. Each time the oscillator reaches its peak voltage, an on-time pulse is initiated. The on-time pulse can be adjusted by the user by setting an external resistor, or via an on-chip reference voltage, allowing the user to select the minimum and maximum on-times. The on-time pulse is used to switch a power MOSFET, resulting in power transfer from the input to the output.

The LTC3115 also has an on-chip synchronous rectifier to improve power conversion efficiency in boost-mode operation. This synchronous rectifier essentially serves to replace one of the external MOSFETs required for a conventional boost converter design, and it is controlled by the on-time pulse of the switching regulator. This improves efficiency and provides a faster response time to transient loads.

Conclusion

The LTC3115 IDHD-2#PBF is a versatile and effective power management integrated circuit designed to provide efficient voltage regulation and power conversion. Its wide input voltage range, high efficiency, and adjustable on-time pulse make it suitable for a variety of applications including portable consumer electronics and industrial control systems, motor control, and battery-backup systems. The on-chip synchronous rectifier also provides improved efficiency in boost-mode operation. By taking advantage of all the features of the LTC3115, users can build systems capable of withstanding large power draw transients while still maintaining high efficiency levels.

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