The ISL91107 is a highly-integrated buck-boost switching regulator that accepts input voltages either above or below the regulated output voltage. Unlike other buck-boost regulators, this regulator automatically transitions between operating modes without significant output disturbance.

This device is capable of delivering up to 2A of output current (PVIN = 2.8V, VOUT = 3.3V) and provides excellent efficiency due to its fully synchronous 4-switch architecture. No-load quiescent current of only 45µA also optimizes efficiency under light-load conditions.

The ISL91107 is designed for standalone applications and supports 3.3V fixed output voltages or variable output voltages with an external resistor divider. Output voltages as low as 1V or as high as 5.2V are supported using an external resistor divider.

The ISL91107 requires only a single inductor and very few external components. Power supply solution size is minimized by a 2.15mmx1.51mm WLCSP and a 2.5MHz switching frequency, which further reduces the size of external components. Alternatively, the ISL91107IR is available in a 3x4 20 Ld TQFN package.


  • Accepts input voltages above or below regulated output voltage
  • Automatic and seamless transitions between Buck and Boost modes
  • Input voltage range: 1.8V to 5.5V
  • Output current: up to 2A (PVIN = 2.8V, VOUT = 3.3V)
  • High efficiency: up to 96%
  • 45μA quiescent current maximizes light-load efficiency
  • 2.5MHz switching frequency minimizes external component size
  • Selectable forced PWM mode
  • Fully protected for short-circuit, over-temperature and undervoltage
  • Small 2.15mmx1.51mm WLCSP


  • Smartphones and tablet PCs
  • Wireless communication devices
  • 2G/3G/4G power amplifiers


Title language Type Format File Size Date
star ISL91107 Datasheet Datasheet PDF 974 KB
AN9208: High Frequency Power Converters Application Note PDF 592 KB
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
Keeping Pace with Power Hungry Mobile Devices 日本語, 简体中文 White Paper PDF 285 KB
PCN20026 - Alternate manufacturing facility of the listed Renesas WLCSP products Product Change Notice PDF 109 KB

memoryBoards & Kits

Part Number Title Type Company
ISL91107IIN-EVZ High-Efficiency Buck-Boost Regulators with 4.1A Switches Evaluation Board Evaluation Renesas
ISL91107IIA-EVZ High-Efficiency Buck-Boost Regulators with 4.1A Switches Evaluation Board Evaluation Renesas

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