DATASHEET NOT RECOMMENDED FOR NEW DESIGNS
RECOMMENDED REPLACEMENT PART
ISL85403 ISL85402 FN7640
Rev 1.00
April 25, 2013 2.5A Regulator with Integrated High-Side MOSFET for Synchronous Buck or
Boost Buck Converter
The ISL85402 is a synchronous buck controller with a 125mО©
high-side MOSFET and low-side driver integrated. The ISL85402
supports a wide input range of 3V to 36V in buck mode. It
supports 2.5A continuous load under conditions of 5V VOUT, VIN
range of 8V to 36V, 500kHz and +105В°C ambient temperature
with still air. For any specific application, the actual maximum
output current depends upon the die temperature not exceeding
+125В°C with the power dissipated in the IC, which is related to input
voltage, output voltage, duty cycle, switching frequency, board layout
and ambient temperature, etc. Refer to “Output Current” on page 14
for more details.
The ISL85402 has a flexible selection of operation modes of
forced PWM mode and PFM mode. In PFM mode, the
quiescent input current is as low as 180ВµA (AUXVCC connected
to VOUT). The load boundary between PFM and PWM can be
programmed to cover wide applications.
The low-side driver can be either used to drive an external low-side …
