LT8705HFE#TRPBF

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LT8705HFE#TRPBF Application Field and Working Principle

The LT8705HFE#TRPBF is a high performance dual output synchronous buckregulator specifically designed for powering always-on MIPI devices and otherlow power applications. It features a low quiescent current, up to 700mA ofcurrent output and up to 5V output voltage.

LT8705HFE#TRPBF Features

The LT8705HFE#TRPBF is a highly integrated, dual output, low quiescent current,high efficiency synchronous buck regulator with multiple safety features. Itfeatures an adjustable output voltage, wide input voltage range, adjustableoutput current limit, an adjustable soft-start time, and an optional enablepin. It also includes a wide range of protection features such as overvoltageprotection, short circuit protection, cycle-by-cycle current limit, andovertemperature protection.

The LT8705HFE#TRPBF is also highly efficient due to its synchronousrectification architecture, integrated low ON resistance power switches, andintegrated MOSFETs that reduce external component count and switching losses.it is capable of achieving up to 98% power conversion efficiency.

LT8705HFE#TRPBF Applications

The LT8705HFE#TRPBF is designed for relatively low power applications suchas powering always-on MIPI devices, such as LCDs, as well as other low powerapplications such as wearables and other mobile devices with low quiescentcurrent requirements. It is also suitable for applications that require aflexible output voltage range and robust protection.

LT8705HFE#TRPBF Working Principle

The LT8705HFE#TRPBF operates in a synchronous buck regulator topology. Inthis topology, the input power is connected to the output of the power switchwhich is an N-channel MOSFET. The voltage across the switch is regulatedusing the external voltage divider and a voltage loop between the switch nodeand the error amplifier.

The error amplifier senses the voltage at the switch node and compares itto a reference voltage. If the voltage rises above the reference voltage,the error amplifier will reduce the drive to the power switch and thus shutit off. This will reduce the current in the switch, which will reduce thevoltage at the switch node. Similarly, if the voltage falls below thereference voltage, the error amplifier will increase the drive to the powerswitch and thus increase the current in the switch, which will increase thevoltage at the switch node.

The LT8705HFE#TRPBF also features an adjustable soft-start that allows forsmooth start up of the regulator, and an adjustable current limit forprotection when the load current exceeds the predetermined limit. In addition,the LT8705HFE#TRPBF also features over-voltage protection, short circuitprotection, cycle-by-cycle current limit, and over-temperature protection forextra safety.

Conclusion

The LT8705HFE#TRPBF is a highly integrated, low quiescent current,high efficiency, dual output synchronous buck regulator specifically designedfor powering always-on MIPI devices and other low power applications. Itfeatures adjustable outputs, wide input voltage range, adjustable currentlimit, adjustable soft-start time, and a wide range of protection features.It is capable of achieving up to 98% power conversion efficiency and issuitable for applications that require a flexible output voltage and robustprotection.

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