The ISL91106 and ISL91106A are highly integrated buck-boost switching regulators that accept input voltages either above or below the regulated output voltage. Unlike other buck-boost regulators, these regulators automatically transition between operating modes without significant output disturbance. The devices also include a selectable bypass mode for low power consumption in applications that have a sleep or low-power mode.

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

The ISL91106 and ISL91106A are designed for standalone applications. They support 3.3V and 3.4V 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 ISL91106 and ISL91106A require 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.


  • ISL91106 with 3.8A switches
  • ISL91106A with 4.2A switches
  • 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 (PVIN = 2.8V, VOUT = 3.3V):
  • 2.1A (ISL91106A)
  • 2A (ISL91106)
  • High efficiency: up to 96%
  • 45µA quiescent current maximizes light load efficiency
  • 2.5MHz switching frequency minimizes external component size
  • Selectable forced PWM mode
  • Selectable bypass power saving mode
  • Fully protected for over-temperature, overcurrent, and undervoltage
  • Small 2.15mmx1.51mm WLCSP


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

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active WLCSP-TKCURDL Reel 3000
Active WLCSP-TKCURDL Reel 3000
Active WLCSP-TKCURDL Reel 3000


Title language Type Format File Size Date
Datasheets & Errata
ISL91106, ISL91106A Datasheet Datasheet PDF 863 KB
ISL91106, ISL91106A Data Short Short Form Datasheet PDF 209 KB
Application Notes & White Papers
AN9208: High Frequency Power Converters Application Note PDF 592 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 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