Data brief

For further information contact your local STMicroelectronics sales office.

November 2009

Doc ID 16613 Rev 1

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EVAL5987

EVAL5987A

3 A step-down switching regulator demonstration board

based on the L5987, L5987A

Features

up to 1 MHz

for the L5987A

Description

The EVAL5987/A demonstration board provides

the design engineer with a fully functional step-

down switching regulator with an output current of

up to 3 A. The board integrates

STMicroelectronics’ L5987/A 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 L5987/A 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 0.6 V

up to the input voltage.

The compensation network on the demonstration

board allows the use of 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 demonstration

board is set to 500 kHz by means of the R5

resistor connected to pin Fsw.

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