ISL91108

High Efficiency Buck-Boost Regulator with 4.2A Switches

OVERVIEW

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.

KEY FEATURES

  • 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

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL91108
Basic Information
生产状态
Mass Production
iSim模型
YES
拓扑
Buck-Boost
输出数量
1
输入电压最小值 (V)
1.8
输入电压最大值 (V)
5.5
输出电压最小值 (V)
1
输出电压最大值 (V)
5.2
输出电流最大值 (A)
1.6
IQ
27.5 µA
开关频率 (最大值) (MHz)
2.9
开关频率 (最小值) (MHz)
2.4
最大占空比 (%)
-
资质级别
Standard
峰值效率 (%)
95
POR
Yes
SYNCH功能
Yes
控制类型
Current Mode
开关频率范围 (MHz)
2.4 to 2.9MHz
CAN 采样
YES
温度范围
-40 to +85

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