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

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’ L5986\\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 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.

Key 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


Technical Documentation

Product Specifications
Description Version Size
DB0909 DB0909: 2.5 A step-down switching regulator demonstration board based on the L5986, L5986A 1.1 283 KB


License Agreement
Description Version Size
Evaluation products license agreement 1.0 125 KB
Support & Community

Sample & Buy

Part Number Core Product Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
EVAL5986 L5986 Active 12.87 - NEC EAR99 - MORE INFO Buy Direct Add to cart DISTRIBUTOR AVAILABILITY

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
EVAL5986 ActiveCARDIndustrialNot compliant

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.