Overview

The ISL9112 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.

The device is capable of delivering up to 1.2A output current and provides excellent efficiency due to its fully synchronous 4-switch architecture. A no-load quiescent current of only 35µA 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 ISL9112 supports a broader set of programmable features that may be accessed via an I2C bus interface. With a programmable output voltage range of 1.9V to 5V, the ISL9112 is ideal for applications requiring dynamically changing supply voltages. A programmable slew rate can be selected to provide smooth transitions between output voltage settings.

The device requires only a single inductor and very few external components. A power supply solution size is minimized by a tiny 3mm x 3mm package and a 2.5MHz switching frequency, which further reduces the size of external components.

ISL9110_ISL9112 Functional Diagram
ISL9110_ISL9112 Functional Diagram
  • 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 1.2A
  • High Efficiency: Up to 95%
  • 35µA Quiescent Current Maximizes Light-load Efficiency
  • 2.5MHz Switching Frequency Minimizes External Component Size
  • Selectable Forced-PWM Mode and External Synchronization
  • I2C Interface
  • Fully Protected from Overcurrent, Over-temperature, and Undervoltage
  • Small 3mm x 3mm TDFN Package

Applications

  • Regulated 33V from a Single Li-Ion Battery
  • Smart Phones and Tablet Computers
  • Handheld Devices
  • Point-of-Load Regulators

Design & Development

Software Downloads
Type Title Date
Library
ISL9112 Evaluation Installer
EXE 2.14 MB
Library
ISLUSBI2C Driver Installer
EXE 614 KB
2 items

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Product Options

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    ISL9112IRT7Z
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    ISL9112IRT7Z-T
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    ISL9112IRTNZ
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    ISL9112IRTNZ-T
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    		TDFN Reel 3 1.76 Get Samples,
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