ISL95857IRTZ-T

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The ISL95857IRTZ-T is a special purpose, integrated-circuit voltage regulator known as a Power Management Integrated Circuit (PMIC). It is a single supply, low dropout (LDO) regulator with low quiescent current offered in a super small, low profile 3.8 mm x 3 mm molded-down package. This regulatory device provides adjustable output voltage between 1.2 and 5.0 volts and features a low current type shutdown, low power detection, and a special mode for battery switchover.

The ISL95857IRTZ-T voltage regulator integrates a variety of components and functions in a single device, reducing board space and cost. It is ideally suited for applications in communication and consumer electronics, such as cellular phones, digital cameras and PDAs, where both low quiescent current and adjustable output voltage are required. Additionally, it has the capability of driving up to four white LEDs in backlight applications.

The working principle of the ISL95857IRTZ-T voltage regulator is based on feedback control, regulating the output voltage at a set level using a dead time control technique. It accurately controls the output voltage of the regulator over a range of 1.2 to 5.0 V with a 0.5 V accuracy. The regulator uses an external feedback pin which allows the user to program the output voltage using an external resistor divider. The device also has an enable pin which is used to activate the regulator, allowing it to achieve the predefined output voltage level.

The ISL95857IRTZ-T has a shutdown current of less than 100 nA. This helps conserve the battery power when the regulator is not in use. Furthermore, it has an input voltage range of 2.5 V to 5.5 V and output current of up to 500 mA. This makes it suitable for several applications where input voltage fluctuations are expected. It also features over-current protection and thermal shut down for a safe operation.

The ISL95857IRTZ-T is a reliable, fast responding and efficient voltage regulator, making it an ideal choice for low voltage, low quiescent current applications. It is capable of driving up to 4 White LEDs in series, making it suitable for backlight applications. Additionally, it features low current type shutdown, over-current protection functions, and the capability of battery switchover. This device is small, easy to use and is an excellent choice for designers looking for a highly integrated power management solution.

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