ISL78208ARZ

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ISL78208ARZ is a synchronous buck inductor-based DC-DC switching regulator, specifically for automotive Power Management Integration Circuit (PMIC). This application field is applicable for different electronics and electrical components to provide stable power supplies. ISL78208ARZ integrated circuit (IC) coordinates the power supply between a wide range of input voltages and combination of output configurations. This IC is capable of delivering 12 A continuous current or 20 A of pulse current from 4.5 V to 18 V input supply. The 300 mΩ MOSFETs and 0.63 A phase current make it possible to deliver power up to 6 W at the output.

The ISL78208ARZ IC uses a synchronous buck converter topology to step down the output voltage. The sync buck converter has superior efficiency and fast switching times as compared to other topologies. It starts with a high-side MOSFET, followed by a synchronous rectifier at the output stage. As shown in the block diagram, the IC also has main control section which is responsible for the internal operation of the converter.

The ISL78208ARZ IC contains synchronous buck inductor-based PWM (pulse width modulation) controller with integrated gate driver. The device has an adjustable fixed off-time with an external resistor and fixed 4.2 MHz switching frequency. The inbuilt over voltage (OV) protection, over current (OC) protection, and thermal shutdown (TSD) ensure enhanced control and safety. The operational amplifier (OP Amp) sets the output voltage while an external MOSFETs to drive the output stage. The non-synchronous rectification is used in the device, so that if the output voltage tries to exceed the input voltage, then the main MOSFET is disconnected from the circuit.

The IC has a 2.5 V reference voltage for the maximum duty cycle and for the current limit protection. It can be used in both continuous and discontinuous modes of operation. The start-up process of the ISL78208ARZ IC is handled by an external resistor and once the system reaches its stable operating condition, it releases the start-up resistor. This IC is ideal for use in storage and power supplies for industrial, battery-powered and automotive applications.

In summary, the ISL78208ARZ IC is an integrated synchronous buck switching regulator designed specifically for automotive Power Management Integration Circuit (PMIC) applications. The device supports wide input and output combinations, with adjustable fixed-off time and 4.2-MHz fixed switching frequency. It contains two 300mΩ MOSFETs and 0.63 A phase current to deliver power up to 6 W. The IC is capable of operating with over voltage, over current and thermal shutdown protection. This device is widely used in storage and power supplies for industrial, battery-powered and automotive applications.

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