ISL854022.5A Regulator with Integrated High-Side MOSFET for Synchronous Buck or Boost Buck Converter DATASHEET

PublishTime： 2018-09-25 Manufacturer： Renesas Type： Datasheet Language： English

The ISL85402 is a synchronous buck controller with a 125mΩ

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 +105°C ambient temperature

with still air. For any specific application, the actual maximum

output current depends upon the die temperature not exceeding

+125°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 180µA (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

MOSFET for a synchronous buck, or left unused for a standard

non-synchronous buck. The low-side driver can also be used to

drive a boost converter as a pre-regulator followed by a buck

controlled by the same IC, which greatly expands the operating

input voltage range down to 2.5V or lower (Refer to “Typical

Application Schematic III - Boost Buck Converter” on page 5).

The ISL85402 offers the most robust current protections. It

uses peak current mode control with cycle-by-cycle current

limiting. It is implemented with frequency foldback under

current limit condition; besides that, the hiccup overcurrent

mode is also implemented to guarantee reliable operations

under harsh short conditions.

The ISL85402 has comprehensive protections against various faults

including overvoltage and over-temperature protections, etc.

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