Description:The ISL9123 is a highly integrated buck switching regulator that is capable of supplying output voltage down to 0. 4V. It features an extremely low quiescent current consumption of 950nA in Regulation mode, 140nA in Forced Bypass mode, and 7nA in Shutdown mode. It provides 80% efficiency at 10µA load and has a peak efficiency of 97%. It supports input voltages from 1. 8V to 5. 5V. The ISL9123 has automatic bypass functionality for situations in which the input voltage is close to the output voltage. In addi
Renesas provides a recommended PCB layout guide in their application note AN1995, which includes guidelines for component placement, routing, and thermal management to ensure optimal performance and minimize noise.
The output capacitor selection depends on the output voltage, output current, and desired ripple voltage. Renesas recommends using a low-ESR capacitor with a value between 10uF to 22uF, and a voltage rating of at least 1.5 times the output voltage. A higher capacitance value can be used for lower output voltages and higher output currents.
Although the datasheet specifies a maximum input voltage of 5.5V, it's recommended to limit the input voltage to 5.2V to ensure reliable operation and prevent damage to the device.
The ISL9123II4Z-T has built-in OCP and SCP features. To implement these features, connect the OCP pin to a resistor divider network that sets the OCP threshold, and connect the SCP pin to a capacitor that sets the SCP delay time. Refer to the datasheet and application notes for detailed implementation guidelines.
Renesas provides a thermal derating curve in their datasheet, which shows the maximum allowed power dissipation versus ambient temperature. The curve helps designers to determine the maximum output current and power dissipation at a given temperature.
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ISL9123II4Z-T Overview
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