ISL91132IIPZ-T

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PMIC - Voltage Regulators - DC DC Switching Regulators

ISL91132IIPZ-T is an integrated circuit that comprises a linear voltage regulator and a DC-DC switching regulator. It has been developed primarily to offer efficient power conversion in portable applications. This document elaborates the application field of the device and its working principle.

Application Field

The ISL91132IIPZ-T is a versatile power supply solution that can offer efficient regulation in a variety of portable applications. These may include notebooks, tablets, cellular phones, portable media players, digital still cameras, and various portable sensors.

Its capability to latch OFF in case of over-temperature or over-current condition makes it a suitable solution for these applications. This protective feature can help extend the lifespan of the circuit. Furthermore, its low standby current mode of operation is suitable for battery-powered devices.

Working Principle

The ISL91132IIPZ-T comprises of two distinct regulators: a linear regulator and a DC-DC switching regulator. Both of these regulators share a common input and output, thus allowing them to operate in tandem. The linear regulator is responsible for supplying a fixed voltage, whereas the switching regulator is responsible for converting the input voltage to an adjustable output voltage.

The linear regulator utilizes bipolar transistors to draw a constant current from the input, thus delivering a fixed output voltage. On the other hand, the DC-DC switching regulator takes advantage of a switching converter topology and a transistor driver stage to convert the input voltage to an adjustable output voltage. The output voltage of the switching converter is determined by an external voltage reference and an internal transconductance amplifier.

The on/off control of the output is achieved through an enable pin, whose logic is internally inverted. A Start/Stop pin is provided for the regulation loop startup and stoppage. The thermal protection of the chip is ensured by a temperature sensing system.

Conclusion

The ISL91132IIPZ-T is an efficient multi-purpose power supply solution for portable applications. It offers two distinct regulators: a linear voltage regulator and a DC-DC switching regulator. The device utilizes bipolar transistors and a switching converter topology to convert the input voltage to a fixed output voltage or an adjustable output voltage, respectively. Additionally, its protection features, such as over-current and over-temperature protection, ensure its reliability in harsh portable environments.

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