ISL91107IRTAZ-T7A

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ISL91107IRTAZ-T7A Application Field and Working Principle

The ISL91107IRTAZ-T7A is an ultra-low quiescent current, configurable, multiple-output step-down DC-DC regulator IC. This device is a part of Intersil’s Flexible Power solutions family, offering high efficiency and dynamic system control. It is designated as a PMIC (Power Management IC) and serves DC-DC switching regulators’ application field. This article will provide an overview of the data sheet of this product and discuss it\'s working principle.

Overview of ISL91107IRTAZ-T7A

The ISL91107IRTAZ-T7A is a DC-DC switching regulator IC that includes up to five configurable outputs and up to three fixed outputs. It features both synchronous and asynchronous buck converters for a wide range of input voltages. It also provides wide input and output range, configurable accuracy and ripple control, and is provided in a 4 mm x 4 mm thermally enhanced LGA package. This IC also provides programmable voltage sequencing, over current protection and low-power operation mode for additional power savings.

Application Fields

The ISL91107IRTAZ-T7A is suitable for a wide range of applications, from hybrid automotive to industrial, medical and consumer electronics. It is designed for intelligent/distributed power supplies, providing multi-output configurations, accuracy levels, and integration options. These features make it ideally suitable for cost-sensitive wearable and battery-operated applications, such as smartphones, IoT solutions and connectivity applications, tablets and other digital systems.

Working Principle

The ISL91107IRTAZ-T7A operates by synchronously regulating the output voltages to their desired levels. The power stage of the device consists of a set of switch devices, a set of synchronous rectifiers and an inductor, which is connected between the input voltage and the output voltage. When the switch is on, the current from the input voltage flows through the inductor and builds up a magnetic field. When the switch is off, the current is short-circuited and the pre-built magnetic field generates the output voltage. By rapidly switching the switch on and off, an average output voltage can be achieved.

The ISL91107IRTAZ-T7A features two on-chip power control loops and two programmable switches, allowing a linear voltage drop across the inputs and outputs. The main controller and loop filter control the output voltage through switching and integrated FETs, implementing a constant output voltage regulation loop. The adaptive mode control loop measures the output resistance of the external FETs and alters the duty cycle of the switches accordingly.

Output Voltage Ripple Control

Ripple voltage is a common output for DC-DC switching regulators. The ISL91107IRTAZ-T7A offers multiple ways to reduce the output ripple. The “ripple control” header enables ripple control via the input filter inductors, which may be large to reduce the output ripple. The IC also supports phase-shifted multiphase mode operation, which converts a single phase buck into a two or three phase buck converter, effectively increasing the operating frequency while increasing output ripple rejection.

Conclusion

The ISL91107IRTAZ-T7A is a multi-output, ultra-low quiescent current DC-DC switching regulator IC suitable for a wide range of application fields. It provides wide input and output range, configurable accuracy and ripple control, and is provided in a 4 mm x 4 mm thermally enhanced LGA package. It features two on-chip power control loops and two programmable switches, allowing linear voltage drops across its input and outputs, and offer multiple ways of output ripple voltage control. These features make it ideal for cost-sensitive, continuous power supply applications.

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