Description

The STEVAL-ISA154V1 product evaluation board

provides the design engineer with a fully

functional step-down switching regulator with an

output current of up to 0.7 A. The STEVALISA154V1 integrates STMicroelectronics' L5980

step-down switching regulator together with all

the external components required for a typical

application. The rated voltage of the input

capacitor and the Schottky diode rectifier

repetitive peak reverse voltage are both 25 V,

making the board capable of covering the entire

2.9 V - 18 V input voltage range of the L5980

device. The board features an external resistor

divider (R1 and R2) designed for an output

voltage of 3.3 V. The output voltage can be set to

a level from 0.6 V up to the rated voltage of the

output capacitor (16 V). The compensation

network on the evaluation board allows the use of

an MLCC as 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 500 kHz by means of the R5

resistor connected to pin Fsw.

Features

• 0.7 A DC output current

• 2.9 V to 18 V input voltage

• Output voltage adjustable from 0.6 V to 16 V

• 250 kHz switching frequency, programmable

up to 1 MHz

• Internal soft-start and inhibit

• Low dropout operation: 100 duty cycle

• Zero-load current operation

• Overcurrent and thermal protection

• VFQFPN8 (3 x 3 mm) package