STEVAL-ISA144V1

STEVAL-ISA144V1 is a 1.5A step-down switching regulator evaluation board based on the L5983. The L5983 integrates STMicroelectronics’ step-down switching regulator, together with all the external components required for a typical application. The rated voltage of the input capacitor and Schottky diode rectifier’s repetitive peak reverse voltage are both 25V, making the board capable of covering the entire 2.9V - 18V input voltage range of the L5983 device. The board features an external resistor divider (R1 and R2) designed for an output voltage of 3.3V. The output voltage can be set to a level from 0.6V up to the rated voltage of the output capacitor (16V). The compensation network on the evaluation board allows the use of MLCC as an output filter to keep the loop stable. The inductor saturation current and forward current of the Schottky diode are within the current limit values. The switching frequency on the board is set to 500kHz by means of the R5 resistor connected to pin Fsw.

• 250kHz switching frequency, programmable up to 1MHz
• Internal soft-start and inhibit
• Low dropout operation: 100% duty cycle
• Zero-load current operation
• Overcurrent and thermal protection