The ISL6720A is a low cost linear regulator for generating a

low voltage bias supply from intermediate distributed

voltages commonly used in telecom and datacom

applications. It produces three separate outputs, an

adjustable 0V to 20V output rated at up to 125mA which can

be back-biased from an external source such as an auxiliary

transformer winding, a 50mA switched regulated output

adjustable between 0V and 15V, and a fixed continuous 5V

output rated at 25mA.

The ISL6720A may be used as a start-up or a continuous

low power regulator. When operating as a start-up regulator,

it is capable of sourcing over 100mA from a 100V source for

short durations. This period of time allows the power supply

to start-up and provide a low voltage alternate power source,

such as the output of a transformer winding, to the VIO

output. This allows the remaining outputs to be operated

from a lower source voltage thereby minimizing power loss.

Features

• 100V Input Capability

• Adjustable Auxiliary Winding Regulator with 40V

Withstand Capability

• Up to 125mA Combined Output Current on Switched and

Unswitched Outputs

• 250μs Delayed Start (VIO, VSW) after Continuous

(VCONT) Output

• Regulated Switched (VSW) and Unswitched Outputs

(VIO)

• 5V @ 25mA Continuous Output (VCONT)

• 2-Stage Over-Temperature Protection

• Package Compliant with IPC2221A, Creepage and

Clearance Spacing Requirements

• Pb-Free Available (RoHS Compliant)

Applications

• Telecom/Datacom DC/DC Converters

• Low Power Bias Supplies