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STMicroelectronics Eval5983

1.5 A step-down switching regulator demonstration board based on the L5983

Overview

TopologyBuck Converter
Input voltage3.3-18 V
Switching frequency250-1000 kHz
Output 13.3 V / 1.5 A
IC revision1

Description

The EVAL5983 demonstration 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 typicalapplication.The rated voltage of the input capacitor and the Schottky diode rectifier repetitive peak reverse voltage are both 25 V, making the board capableof 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 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.

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, programmableup to 1 MHz
  • Internal soft-start and inhibit
  • Low dropout operation: 100 % duty cycle
  • Zero-load current operation
  • Over-current and thermal protection
  • VFQFPN8 3 mm x 3 mm package

Typical applications

  • STB, DVD, DVD recorder, car audio, LCD TV and monitors
  • optical storage, hard disk drive,printers, audio/graphic cards
  • PLD, PLA, FPGA,chargers
  • XDSL, modems, DC-DC modules
  • LED driving

Products

Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples
7447779006
IGS STP ALT EAG CAD LTS PSP SPE CADWE-PD SMT Power Inductor 6.8 2.91 3.3 33 35 32 7345 Robust
Order Code Data­sheet
7447779006
Samples
Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
SizeVersion Samples