The ISL91127IRN-EVZ platform allows for quick evaluation of the high-performance features of the ISL91127IR buck-boost regulator.

The ISL91127IR is a high-current buck-boost switching regulator for systems using new battery chemistries in a 20 Ld, 0.5mm pitch QFN (4mm x 4mm) package. It uses Renesas' proprietary buck-boost algorithm to maintain voltage regulation while providing excellent efficiency and very low output voltage ripple when the input voltage is close to the output voltage.


  • Small, compact design
  • Jumper selectable EN (enabled/disabled)
  • Jumper selectable mode (auto PFM/forced PWM)
  • Connectors, test points and jumpers for easy probing
  • Fixed 3.3V output voltage on the ISL91127IRN-EVZ



  • Handheld and battery powered consumer and medical devices
  • Brownout free system voltage for smartphones and tablet PCs
  • Wireless communication devices
  • 2G/3G/4G RF power amplifiers


Type Title Date
Manual - Development Tools PDF 559 KB
Datasheet PDF 1.01 MB
2 items

Design & Development

Software & Tools

Software Downloads

Type Title Date
PCB Design Files ZIP 1.14 MB
1 item

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