DATASHEET
ISL81401, ISL81401A
40V 4-Switch Synchronous Buck-Boost Controller
FN9310
Rev.1.01
Jan 27, 2022
The ISL81401 and ISL81401A are 4-switch synchronous
buck-boost controller with peak and average current
sensing and monitoring at both ends. The ISL81401 is a
bidirectional device that can conduct current in both
directions while the ISL81401A is an unidirectional
device.
Features
• Single inductor 4-switch buck-boost controller
• On-the-fly bidirectional operation with independent
control of voltage and current on both ends
• Proprietary algorithm for smoothest mode transition
The ISL81401 and ISL81401A use the proprietary
buck-boost control algorithm with valley current
modulation for Boost mode and peak current modulation
for Buck mode control.
• MOSFET drivers with adaptive shoot-through
protection
• Wide input voltage range: 4.5V to 40V
• Wide output voltage range: 0.8V to 40V
• Supports pre-biased output with SR soft-start
• Programmable frequency: 100kHz to 600kHz
The ISL81401 and ISL81401A have 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 ends 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,
and average and peak current limit on both input and
output to ensure high reliability in both unidirectional
and bidirectional operation.
• Supports parallel operation current sharing with
cascade phase interleaving
• External sync with clock out or frequency dithering
• External bias for higher efficiency supports 5V - 36V
input
• Output and input current monitor
• Selectable PWM mode operation between
PWM/DE/Burst modes
• Accurate EN/UVLO and PGOOD indicator
• Low shut down current: 2.7µA
The IC is packaged in a space conscious 32 Ld
5mmx5mm QFN package to improve thermal dissipation
and noise immunity. The unique DE/Burst mode at
light-load dramatically lowers standby power
consumption with consistent output ripple over different
load levels.
• Complete protection: OCP, SCP, OVP, OTP, and UVP
• Dual-level OCP protection with average current
and pulse-by-pulse peak current limit
• Selectable OCP response with either hiccup or
constant current mode
• Negative pulse-by-pulse peak current limit
Rs_out
UG2
Rs_in
UG1
VIN
VOUT
Applications
• Battery backup
Q1
Q2
Q4
Q3
L
• Type-C power supply and chargers
• Battery powered industrial applications
• Aftermarket automotive
• Redundant power supplies
• Robot and drones
PH1
PH2
LG2
LG1
Figure 1. Buck-Boost Power Train Topology
• Medical equipment
• Security surveillance
FN9310 Rev.1.01
Jan 27, 2022
Page 1 of 46
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