ISL95835IRZ-T

Series:	Robust Ripple Regulator™ (R3)
Packaging:	Tape & Reel (TR)
Part Status:	Active
Applications:	Converter, Intel IMVP-7, VR12™
Voltage - Input:	4.5 V ~ 5.5 V
Number of Outputs:	2
Voltage - Output:	Up to 1.52V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	40-VFQFN Exposed Pad
Supplier Device Package:	40-QFN (5x5)
Base Part Number:	ISL95835

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AbstractThe ISL95835IRZ-T is a special purpose voltage regulator, specifically a precision low dropout (LDO) regulator to be used in applications requiring very low quiescent current and tight load and line regulation. This paper will discuss the different application fields for the ISL95835IRZ-T and its underlying working principle.IntroductionThe ISL95835IRZ-T is a high-performance LDO regulator that is optimized for use in precision, low-power applications. It provides an ultra-low dropout voltage and tight load and line regulation. It also features a very low quiescent current, making it ideal for mobile and battery-powered systems. The ISL95835IRZ-T is especially designed with a slew rate of 2mV/V guaranteeing very low output noise. It can output up to 150mA of current with a wide 1.5V to 5.5V input voltage range and up to 7.0V of output voltage range.Application FieldThe ISL95835IRZ-T is a low-noise, low-quiescent current regulator ideal for a wide range of portable and low-power applications. It is suitable for battery-powered systems, as it consumes only 330μA of quiescent current, allowing the battery to last longer. It also uses a proprietary adaptive mute circuitry that improves high-frequency noise immunity and reduces radiated EMI, making it ideal for customers that are looking for a low-noise solution. Additionally, its low dropout voltage makes it suitable for automotive applications, particularly for powering sensors and communication systems.Working PrincipleThe ISL95835IRZ-T is a classic negative LDO voltage regulator, featuring a high gain differential amplifier, a reference voltage divider, and an adjustable bandgap reference. Its primary regulating element is a P-channel MOSFET. The output voltage of the device is controlled by comparing the voltage from the voltage divider with the adjustable bandgap reference. When the two voltages are equal, the MOSFET is switched off, resulting in a low voltage dropout condition. The output voltage is then held at the reference voltage. When the voltage difference between the voltage divider and the reference voltage is greater than the MOSFET’s threshold voltage, a logic signal is applied to the MOSFET’s gate. The MOSFET then conducts, creating a path for current to flow to the output and creating a regulated output voltage.ConclusionThe ISL95835IRZ-T is a special purpose voltage regulator that can be used in a wide range of low-noise, low-power applications. It features incredibly low quiescent current and very low load and line regulation for optimal performance. Its adaptation of a proprietary adaptive mute circuitry also allows for low-noise operation and improved EMI compliance. The ISL95835IRZ-T works on the classic LDO principle, using a differential amplifier, voltage divider, and adjustable bandgap reference to compare voltages before applying a logic signal to the gate of the MOSFET to ensure a regulated output voltage.

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