DATASHEET
ISL78233, ISL78234 FN8359
Rev 7.00
December 4, 2015 3A and 4A Compact Synchronous Buck Regulators
The ISL78233, ISL78234 are highly efficient, monolithic,
synchronous step-down DC/DC converters that can deliver 3A
(ISL78233), or 4A (ISL78234) of continuous output current from
a 2.7V to 5.5V input supply. The devices use current mode control
architecture to deliver a very low duty cycle operation at high
frequency with fast transient response and excellent loop stability.
The ISL78233, ISL78234 integrate a very low ON-resistance
P-channel (35mО©) high-side FET and N-channel (11mО©)
low-side FET to maximize efficiency and minimize external
component count. The 100% duty-cycle operation allows less
than 200mV dropout voltage at 4A output current. The
operation 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. Very low ON-resistance FETs -P-channel 35mО© and
N-Channel 11mО© typical values High efficiency synchronous buck regulator with up to 95%
efficiency Complete BOM with as few as 3 external parts Internal soft-start -1ms or adjustable Soft-stop output discharge during disable Fault protection is provided by internal hiccup mode current
limiting during short-circuit and overcurrent conditions. Other
protection, such as overvoltage and over-temperature are also
integrated into the device. A power-good output voltage …
