Description:The ISL8502 is a synchronous buck controller with internal MOSFETs packaged in a small 4mm x 4mm QFN package. The ISL8502 can support a continuous load of 2A and has a very wide input voltage range. With the switching MOSFETs integrated into the IC, the complete regulator footprint can be very small and provide a much more efficient solution than a linear regulator. The ISL8502 is capable of stand alone operation or it can be used in a master slave combination for multiple outputs that are derived from the
Renesas provides a recommended PCB layout in the ISL8502IRZ evaluation board user manual, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure optimal performance.
The ISL8502IRZ has an internal undervoltage lockout (UVLO) circuit that ensures the device is properly biased during startup. To ensure proper startup, the input voltage should be ramped up slowly (typically 10-20 ms) to allow the UVLO circuit to detect the valid input voltage and enable the device.
The ISL8502IRZ can drive a maximum capacitive load of 10 nF. Exceeding this limit may cause instability or oscillations in the output voltage. If a larger capacitive load is required, an external buffer capacitor or a separate voltage regulator may be necessary.
The output voltage accuracy and tolerance of the ISL8502IRZ can be calculated using the formula: Vout = (Vref x (1 + (R1/R2))) x (1 ± (ΔVout/Vout)), where Vref is the internal reference voltage, R1 and R2 are the external resistors, and ΔVout is the output voltage tolerance. The datasheet provides the values for Vref and ΔVout.
Renesas recommends using a high-quality, low-ESR ceramic capacitor (e.g., X5R or X7R) with a value of 10-22 μF as the input capacitor. This helps to filter out high-frequency noise and ensure stable operation.
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ISL8502IRZ Overview
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