DATASHEET
ISL91128 FN8732
Rev.3.00
May 3, 2018 High Efficiency Buck-Boost Regulator with 4.5A Switches and I2C Interface
The ISL91128 is a high-current, buck-boost switching regulator
for systems using new battery chemistries. It uses the Renesas
proprietary buck-boost algorithm to maintain voltage
regulation while providing excellent efficiency and very low
output voltage ripple when the input voltage is close to the
output voltage. The device also includes a selectable Bypass
mode for low power consumption in applications that have a
Sleep or Low Power mode.
The ISL91128 is capable of delivering at least 2.2A continuous
output current (VOUT = 3.3V) across a battery voltage range of
2.5V to 4.35V. This maximizes the energy utilization of
advanced, single-cell Li-ion battery chemistries that have
significant capacity left at voltages below the system voltage.
Its fully synchronous low ON-resistance 4-switch architecture
and a low quiescent current of only 30ВµA optimize efficiency
under all load conditions.
The ISL91128 supports a broader set of programmable
features that can be accessed using an I2C bus interface. With
a programmable output voltage range of 1.9V to 5.0V, the …