ISL6558IRZA

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ISL6558IRZA: Application Field and Working Principle

The ISL6558IRZA is a DC-DC switching controller with low voltage and limited power for use in power management integrated circuits (PMIC). It provides extremely low operating and start-up current, making it suitable for use in portable and battery-powered applications that require reliable and efficient operation, such as mobile phones and personal digital assistants.

The ISL6558IRZA enables engineers to design power supplies that meet a variety of application needs. This DC-DC switching controller offers a highly accurate voltage reference, an adjustable output voltage range of 0.5V to 4.5V, a programmable switching frequency of 200kHz to 1.2MHz and a wide input voltage range of 4.5V to 18V.

Working Principle

The ISL6558IRZA is a current-mode pulse width modulation (PWM) controller. It uses a fixed frequency current-mode switching technique to provide step-down DC output voltage with an inductor and capacitor filter. The built-in current-mode control loop senses the voltage feedback from the output and compares it to an internal reference voltage to adjust the power distribution ratio or duty cycle of the switching cycle. This allows the ISL6558IRZA to accurately maintain a stable dc output voltage. The accuracy of the voltage regulation is further enhanced by a single resistor voltage reference circuit included in the device.

The input side of the ISL6558IRZA includes a power switch with high frequency protection and overcurrent sense circuit. This offers protection against both short-circuit and overload conditions. The controller also has a built-in function that prevents a start-up burst of large inrush current and soft-starts the controller to minimize the impact on the input voltage source.

Key Features

• Low start-up current
• Programmable switching frequency with a range of 200kHz to 1.2MHz
• Wide input voltage range of 4.5V to 18V
• Single resistor voltage reference circuit
• High frequency protection and overcurrent sense
• Soft-start function to prevent inrush current

Applications

The ISL6558IRZA is designed to provide high efficiency switching power supplies for a variety of portable and battery-powered applications including mobile phones, digital cameras, PDAs, and MP3 players. It can also be used in automotive and industrial applications that require efficient power management.

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