Data Brief

For further information contact your local STMicroelectronics sales office.

January 2009

Rev 1

1/4

1

Features

up to 1 MHz

Description

The EVAL5985 demonstration board provides the

design engineer with a fully functional step-down

switching regulator with an output current of up to

2 A. The board integrates STMicroelectronics’

L5985 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 L5985 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 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.

EVAL5985

EVAL5985

2 A step-down switching regulator demonstration board

based on the L5985

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