ISL9011IRJNZ

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ISL9011IRJNZ is a linear voltage regulator designed for system power-supply for the mobile device by Intersil. It takes in power from a single Li-ion/Li-Poly battery with a low input voltage of 2.4V, and it is capable to output 5.0V at 500mA. The device comes with a host of features, including reverse voltage protection, thermal protection and over-current protection and so on. This device provides a cost-effective solution to the consumer electronic products that needs high efficiency, low power consumption and high reliability.

The device has many advantages over the heavy, bulky linear regulators available in the market. It has a very small size, allowing it to be used in tight spaces and environments. It utilizes a switching controller and area-aware technology that reduces the component count associated with traditional linear regulators. This device can also provide power conversion efficiency up to 97%, and power savings of up to 60%.

The working principle of ISL9011IRJNZ is based on switching regulation. It has a dedicated control block with the embedded Digital Proportional Integral (DPI) for the conversion of DC current to DC output voltage. This is achieved by sampling the output voltage to produce an error signal that is used to control the output voltage. The error signal produced by the DPI will control the switching controller. The controller then switches on and off the switching generator that produces the output voltage.

A key component of the device is the current-limiting feature, which allows the system to protect components from potential over-currents and to maintain high efficiency. The current is limited by a direct sensing of the output current. Once the current surpasses the set limit, the switching generator will be disabled preventing over current conditions. Moreover, the device also integrates thermal shutdown and reverse voltage protection circuits that turn off the converter and improve safety in case of over-temperature or reverse-voltage conditions.

In addition, the device also offers a low-dropout voltage and a low-quiescent current, making it effective for low power applications. It also has a low voltage start-up of typically 0.9V, making it suitable for portable applications. The device requires a very low input voltage to enable the device, eliminating the need for an additional start up voltage. The enable pin can be set to logic enable, or directly connected to the battery to enable the device.

In conclusion, ISL9011IRJNZ voltage regulator is a highly efficient and reliable device suitable for single cell Li-ion/Li-Poly mobile device applications. It has low power consumption and can maintain high efficiencies up to 97%. It reduces component count associated with traditional linear regulators and offers low-dropout voltage, low-quiescent current and a low voltage start up of typically 0.9V. The current limit feature plus the reverse voltage protection circuit keeps system components safe from over-currents as well as other over-voltage conditions. It is a great choice for low power applications due to its low input voltage requirement.

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