Description:The ISL9104, ISL9104A is a 500mA, 4. 3MHz step-down regulator, which is ideal for powering low-voltage microprocessors in compact devices such as PDAs and cellular phones. It is optimized for generating low output voltages down to 0. 8V. The supply voltage range is from 2. 7V to 6V allowing the use of a single Li+ cell, three NiMH cells or a regulated 5V input. It has guaranteed minimum output current of 500mA. A high switching frequency of 4. 3MHz pulse-width modulation (PWM) allows using small external co
Renesas provides a recommended PCB layout in the ISL9104 evaluation board user manual, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure optimal performance.
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. Additionally, the capacitor should be placed close to the IC to minimize parasitic inductance.
Although the datasheet specifies a maximum input voltage of 5.5V, Renesas recommends limiting the input voltage to 5.2V to ensure reliable operation and prevent damage to the IC. Exceeding the maximum input voltage can cause internal damage or affect the IC's performance.
The ISL9104 has a built-in OCP feature that can be enabled by connecting the OCP pin to a resistor divider network. The OCP threshold can be set by selecting the appropriate resistor values. Renesas provides a detailed example of OCP implementation in the datasheet and application notes.
Renesas recommends using a ceramic capacitor with a value between 1uF to 10uF, and a voltage rating of at least 1.5 times the input voltage. The input capacitor should be placed close to the IC's input pins to minimize parasitic inductance and ensure stable operation.
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ISL9104AIRUAZ-T Overview
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