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ISL91132

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High Efficiency 1.8A Boost Regulator with Input-to-Output Bypass

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Overview

The ISL91132 is an integrated boost switching regulator for battery-powered applications. The device provides a power supply solution for products using a one-cell Li-ion or Li-polymer battery. The device is capable of delivering up to 1.8A output current from VIN = 2.5V and VOUT = 3.3V. The no-load quiescent current is only 108µA in Boost mode and 45µA in Forced Bypass mode, which significantly reduces the standby consumption.

The ISL91132 offers a Bypass mode operation where the output is directly connected to the input through a 38mΩ MOSFET to allow a significantly lower dropout voltage. The Bypass mode can be entered by an external command, or by auto bypass. The Forced Bypass mode allows the output voltage to operate close to the input voltage and improves the efficiency under these conditions.

The ISL91132 is designed to support six fixed output voltages ranging from 3.15V to 5V. A voltage select pin is available for each output variant to scale up the output voltage by a small offset to compensate for the load transient droop. The ISL91132 requires only an inductor and a few external components to operate. The 2.5MHz switching frequency further reduces the size of external components. The ISL91132 is available in a 16-bump, 0.4mm pitch, 1.78mm x 1.78mm WLCSP.

ISL91132 Functional Diagram
ISL91132 Functional Diagram
  • Input voltage range: 2.35V to 5.4V
  • Output current: up to 1.8A (VIN = 2.5V, VOUT = 3.3V)
  • Burst current up to 2A (VIN = 2.5V, VOUT = 3.3V, tON < 600µs, T = 4.6ms)
  • High efficiency: up to 96%
  • 108µA quiescent current minimizes standby consumption in Boost mode, 45µA in Forced Bypass mode
  • 2.5MHz switching frequency minimizes the external component size
  • Forced Bypass or Auto Bypass modes with a 38mΩ switch
  • PFM mode at light-load currents
  • Fully protected from overcurrent, over-temperature, and undervoltage
  • Load disconnect when disabled
  • Small 1.78mm x 1.78mm WLCSP

Documentation

Featured Documentation
Type Title Date
Datasheet
ISL91132 Datasheet
PDF 763 KB
Application Note
AN9208: High Frequency Power Converters
PDF 592 KB
Application Note
AN1681: Grounding Techniques
PDF 509 KB
Application Note
AN1684: Nonideality of Ground
PDF 397 KB
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FAQs

  1. Do I need to add components to compensate the boost regulator in the ISL91132 family?

    Question: Do I need to add components to compensate the boost regulator in the ISL91132 family?   Answer: As this part is available in a fixed output version only, it is internally compensated and no additional components are required for compensation.

    Jan 1, 1970
  2. Which boost control architecture does the ISL91132 family use?

    Question: Which boost control architecture does the ISL91132 family use?   Answer: The ISL91132 family uses the valley current control, in which with every clock cycle the inductor current through the PMOS is monitored.

    Jan 1, 1970

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