For further information contact your local STMicroelectronics sales office.

January 2014

DocID025361 Rev 1

1/4

STEVAL-ISA144V1

1.5 A step-down switching regulator evaluation board

based on the L5983

Data brief

Features

• 1.5 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 mm x 3 mm package

• RoHS compliant

Description

The STEVAL-ISA144V1 product evaluation board

provides the design engineer with a fully

functional step-down switching regulator with an

output current of up to 1.5 A. The L5983

integrates STMicroelectronics’ step-down

switching regulator, together with all the external

components required for a typical application.

The rated voltage of the input capacitor and

Schottky diode rectifier’s 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 L5983 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 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.

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