ISL91117

High Efficiency Synchronous Boost Converter with 4.2A Switches and Output Disconnect

Product Status: Mass Production

OVERVIEW

The ISL91117 is a highly-integrated boost switching regulator for battery powered applications. The device provides a power supply solution for products using dual-cell or three-cell alkaline, NiCd or NiMH, or one-cell
Li-ion or Li-polymer battery.

This device is capable of delivering an output current of 1.5A with PVIN = 3.3V and VOUT = 5V. The use of a synchronous rectifier maximizes efficiency at high loads. No-load quiescent current of only 35µA optimizes efficiency under light-load conditions. Forced PWM and/or synchronization to an external clock may also be selected for noise sensitive applications.

The ISL91117 is designed for standalone applications and supports 5V fixed output voltage or variable output voltages with an external resistor divider. Power supply solution size is minimized by a 2.34mm x 1.72mm WLCSP and a 2.6MHz switching frequency, which allows for the use of tiny, low-profile inductors and ceramic capacitors to minimize the size of the solution.

KEY FEATURES

  • Input voltage range: 1.8V to 4.8V
  • Fixed 5V or adjustable output
  • Output current: up to 1.5A (PVIN = 3.3V,
    VOUT = 5V)
  • High efficiency: up to 96%
  • 35µA quiescent current maximizes light-load efficiency
  • True input-output disconnect when disabled
  • 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
ISL91117
Basic Information
Production Status
Mass Production
iSim Model
YES
Topology
Boost
# of Outputs
1
Input Voltage Min (V)
1.8
Input Voltage Max (V)
4.8
Output Voltage Min (V)
2
Output Voltage Max (V)
5
Output Current Max (A)
1.5
IQ
27.5 µA
Switching Freq. (max) (MHz)
2.9
Switching Freq. (min) (MHz)
2.4
Max Duty Cycle (%)
-
Qualification Level
Standard
Peak Efficiency (%)
96
POR
Yes
SYNCH Capability
Yes
Control Type
Current Mode
Switching Frequency Range (MHz)
2.4 to 2.9MHz
Can Sample
YES
Temperature Range
-40 to +85

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