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