Description:ISL9107 and ISL9108 are 1. 6MHz synchronous step-down regulators with integrated power switches capable of delivering 1. 5A output current, which is ideal for powering low-voltage microprocessors in compact devices such as PDAs and cellular phones. These devices are optimized for generating low output voltages down to 0. 8V. The supply voltage range is from 2. 7V to 5. 5V allowing for the use of a single Li+ cell, three NiMH cells or a regulated 5V input. 1. 6MHz pulse-width modulation (PWM) switching frequ
Renesas provides a recommended PCB layout in the ISL9107 evaluation board user manual, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure optimal performance.
Renesas recommends using an inductor with a high saturation current rating, low DC resistance, and a suitable inductance value based on the switching frequency and output voltage. The ISL9107 datasheet provides a list of recommended inductors, and Renesas also offers an inductor selection tool on their website.
The maximum junction temperature (Tj) for the ISL9107IRZ-T is 125°C. However, it's recommended to keep the junction temperature below 100°C for optimal reliability and performance.
Renesas recommends following the power-up sequence outlined in the ISL9107 datasheet, which includes applying the input voltage, waiting for the internal voltage regulator to stabilize, and then enabling the device. Additionally, the EN pin should be pulled high to enable the device, and the SYNC pin should be connected to a clock signal or left open-circuit.
Renesas recommends using a high-quality, low-ESR ceramic capacitor with a value of 10uF to 22uF for the input capacitor (CIN). The capacitor should be rated for the input voltage and have a low equivalent series resistance (ESR) to minimize voltage ripple and ensure stable operation.
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ISL9107IRZ-T Overview
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