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.

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

Applications

• Smart phones and tablets

• Wireless communication devices

• Products including portable HDMI and USB-OTG