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2.5A step-down switching regulator demonstration board based on L5986 and L5986A

EVAL5986

Overview

The EVAL5986/A demonstration board provides the design engineer with a fully functional stepdown switching regulator with an output current of up to 2.5 A. The board integrates STMicroelectronics L5986A 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 L5986/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.

Main features

Zero-load current operation
Low dropout operation: 100% duty cycle
VFQFPN8 3 mm x 3 mm package or HSOP8 for the L5986A
2.5 A DC output current
Output voltage adjustable from 0.6 V to 16 V
2.9 V to 18 V input voltage
Internal soft-start and inhibit
Overcurrent and thermal protection
250 kHz switching frequency, programmable up to 1 MHz

Design Files

2.5 A step-down switching regulator demonstration board based on the L5986, L5986A

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Update:2025-05-09 05:34:16

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