ISL81801FRTZ-T

The ISL81801 is a true bidirectional 4-switch
synchronous buck-boost controller with peak and
average current sensing and monitoring at both ends.
With wide input and output voltage ranges, the
controller is suitable for industrial, telecommunication,
and after-market automotive applications.
The ISL81801 uses a proprietary buck-boost control
algorithm with valley current modulation for Boost
mode and peak current modulation for Buck mode
control.
The ISL81801 has four independent control loops for
input and output voltages and currents. Inherent peak
current sensing at both ends and cycle-by-cycle
current limit of this family of products ensures high
operational reliability by providing instant current limit
in fast transient conditions at either end and in both
directions. It also has two current monitoring pins at
both input and output to facilitate Constant Current
(CC) limit and other system management functions.
CC operation down to low voltages avoids any
runaway condition at over load or short-circuit
conditions. In addition to multilayer overcurrent
protection, it also provides full protection features
such as OVP, UVP, OTP, average and peak current
limit on both input and output to ensure high reliability
in both unidirectional and bidirectional operation.
The IC is packaged in a space-conscious 32 LD
5mm x5mm TQFN package or easy to assemble
4.4mmx9.7mm 38 LD HTSSOP package. Both
packages use an EPAD to improve thermal
performance and noise immunity. Low pin count,
fewer external components, and default internal
values make the ISL81801 an ideal solution for time
to market simple power supply designs. The unique
DE/Burst mode at light-load dramatically lowers
standby power consumption with consistent output
ripple over different load levels.