The ISL85033 is a wide input range, dual standard buck converter that can be configured to provide a negative output voltage. The ISL85033-12VEVAL3Z evaluation board is used to demonstrate the negative configuration. In this configuration, VIN can range from 4.5V to (28V - VOUT).

The ISL85033 is offered in a 4mm x 4mm 28 Ld TQFN package with 1mm maximum height. The complete converter occupies 6.25cm2 area.


  • Wide input voltage range from 4.5V to (28V - VOUT)
  • Adjustable and synchronizable negative output voltage with continuous output current up to 5A, depending on VOUT and VIN
  • Current mode control
  • Adjustable switching frequency from 300kHz to 2MHz
  • Power-good detection (referenced to VOUT)
  • Externally adjustable soft-start time
  • Overcurrent and hiccup mode short circuit protection, thermal overload protection, UVLO
  • Boot undervoltage detection
  • Default out-of-phase channels reduce voltage ripple and component size; user-selectable phase operation


  • General purpose point-of-load (POL) DC/DC power conversion
  • Set-top boxes (STB)
  • FPGA power and STB power
  • DVD and HDD drives
  • LCD panels, TV power
  • Cable modems

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL85033 Datasheet 日本語 Datasheet PDF 1.95 MB
User Guides & Manuals
ISL85033-12VEVAL3Z User Guide Manual PDF 678 KB