DATASHEET
ISL78235R5668 FN8769
Rev 1.00
January 21, 2016 Automotive 5A Synchronous Buck Regulator Features The ISL78235R5668 is a highly efficient, monolithic,
synchronous step-down DC/DC converter that can deliver 5A
continuous and up to 8A pulsed output current from a 2.7V to
5.5V input supply. The device uses peak current mode control
architecture to achieve very low duty cycle operation at high
frequency with fast transient response and excellent loop stability. 2.7 to 5.5V input voltage range 5A continuous; 8A pulse output current operation 2MHz default switching frequency 100ns guaranteed phase minimum on-time for wide output
regulation The ISL78235R5668 integrates a low ON-resistance P-channel
(35mО©, typical) high-side FET and N-channel (11mО©, typical)
low-side FET to maximize efficiency and minimize external
component count. The 100% duty cycle operation allows less
than 250mV dropout voltage at 5A output current. The
operating frequency of the Pulse Width Modulator (PWM) is
adjustable from 500kHz to 4MHz. The default switching
frequency of 2MHz is set by connecting the FS pin high. Adjustable switching frequency from 500kHz to 4MHz External synchronization from 1MHz to 4MHz Optional PFM mode for light-load efficiency improvement Very low ON-resistance HS/LS switches: 35mО©/11mО© Internal 1ms or adjustable external soft-start The ISL78235R5668 can be configured for discontinuous
(PFM) or forced continuous (PWM) operation at light load.
Forced continuous operation reduces noise and RF
interference, while discontinuous mode provides higher
efficiency by reducing switching losses at light loads. Soft-stop output discharge during disable Fault protection is provided by internal hiccup mode current
limiting during short-circuit and overcurrent conditions. The
device also integrates output overvoltage and …
