概览

简介

The ISL91108 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 2.7A of burst current (PVIN = 3V, VOUT = 3.3V), and provides excellent efficiency due to its fully synchronous 4-switch architecture. No load quiescent current of only 27.5µA also optimizes efficiency under light-load conditions. Forced PWM and/or synchronization to an external clock may also be selected for noise sensitive applications.

The ISL91108 is designed for standalone applications and supports a 3.3V fixed output voltage 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 ISL91108 requires only a single inductor and very few external components. Power supply solution size is minimized by a 2.34mm x 1.72mm WLCSP and a 2.6MHz switching frequency, which further reduces the size of external components.

特性

  • 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 1.6A DC (PVIN = 2.8V, VOUT = 3.3V)
  • Burst current: up to 2.7A (PVIN = 3V, VOUT = 3.3V, tON<600µs, t = 4.6ms)
  • High efficiency: up to 95%
  • 27.5µA quiescent current maximizes light load efficiency
  • 2.6MHz switching frequency minimizes external component size
  • Selectable forced PWM mode and external synchronization
  • Fully protected for short-circuit, over-temperature, and undervoltage
  • Small 2.34mm x 1.72mm WLCSP

应用

应用

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

文档

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PDF 627 KB 数据手册
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设计和开发

软件与工具

软件与工具

Software title
Software type
公司
iSim:PE Offline Simulation Tool
iSim Personal Edition (iSim:PE) speeds the design cycle and reduces risk early in any project, identifying parts that can be used in current as well as next-generation designs.
Simulator 瑞萨电子
1 item

开发板与套件

开发板与套件

模型

模型

类型 日期
SXSCH 214 KB 模型 - iSim
1 item

支持