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GENERAL DESCRIPTION

The ADuM30701 isolator is a regulated dc-to-dc isolated power supply controller with an internal MOSFET driver. The dc-to-dc controller has an internal isolated PWM feedback from the secondary side based on the iCoupler? chip scale transformer technology and complete loop compensation. This eliminates the need to use an optocoupler for feedback and compensates the loop for stability.

The ADuM3070 isolator provides a more stable output voltage and higher efficiency compared to unregulated isolated dc-to-dc power supplies. The fully integrated feedback and loop compensation in a small QSOP package provides a smaller form factor than any discrete solution. The regulated feedback provides a relatively flat efficiency curve over the full output power range. The ADuM3070 enables a dc-to-dc converter with a 3.3 V to 24 V isolated output voltage range from either a 5.0 V or a 3.3 V input voltage, with an output power of up to 2.5 W.

FEATURES

Isolated PWM feedback with built in compensation

Primary side transformer driver for up to 2.5 W output power with 5 V input voltage

Regulated adjustable output: 3.3 V to 24 V

Up to 80 efficiency

200 kHz to 1 MHz adjustable oscillator

Soft start function at power-up

Pulse-by-pulse overcurrent protection

Thermal shutdown

2500 V rms isolation

High common-mode transient immunity: >25 kV/μs

16-lead QSOP package

High temperature operation: 105°C

APPLICATIONS

Power supply startup bias and gate drives

Isolated sensor interfaces

Process controls