March 2017

DocID030410 Rev 1

1/4

For further information contact your local STMicroelectronics sales

office

www.st.com

STEVAL-ISA201V1

3 A step-down switching regulator evaluation board based on the

L5987

Data brief

Features



1.8 V, up to 3 A DC output current



2.9 V to 18 V input voltage





430 kHz switching frequency, programmable

in the range 250 kHz

– 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



RoHS compliant

Description

The STEVAL-ISA201V1 product evaluation board

provides design engineers with a fully functional

step-down switching regulator with an output

current of up to 3 A. The STEVAL-ISA201V1

integrates the STMicroelectronics L5987 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,

rendering the board capable of covering the

entire 2.9 V - 18 V input voltage range of the

L5987 device.

The board features an external resistor divider

(R1 and R2) designed for an output voltage of 1.8

V. The output voltage can be set to a level from

the evaluation board allows the use of an MLCC

as output filter to keep the loop stable. The

switching frequency on the board is set to 430

kHz by means of the R5 resistor connected to pin