Hardware Description

The ISL85033 is a wide input range, dual standard buck converter that can be configured to provide a negative output voltage. The ISL85033-12VEVAL3Z evaluation board is used in this application note to demonstrate the negative configuration. In this configuration, VIN can range from 4.5V to (28V - VOUT).

The ISL85033 is offered in a 4mmx4mm 28 Ld TQFN package with 1mm maximum height. The complete converter occupies 6.25cm2 area.

Key Features

• Wide Input Voltage Range from 4.5V to (28V - VOUT)

• Adjustable and Synchronizable Negative Output Voltage with Continuous Output Current up to 5A, depending on VOUT and VIN

• Current Mode Control

• Adjustable Switching Frequency from 300kHz to 2MHz

• Power-Good Detection (referenced to VOUT)

• Externally Adjustable Soft-start Time

• Overcurrent and Hiccup Mode Short Circuit Protection, Thermal Overload Protection, UVLO

• Boot Undervoltage Detection

• Default Out-of-phase Channels Reduce Voltage Ripple and Component Size. User-selectable Phase Operation.