SC4431(2000) Datasheet PDF - Semtech Corporation

DESCRIPTION
The SC4431 is a four terminal device for regulating an isolated power supply with very low output voltage.
It is intended to be used as a replacement for three terminal shunt regulators such as SC431L where the output voltage is too low for them to function in conjunction with an opto-isolator. It achieves this by having seperate supply and output pins, allowing the output to sink current at voltages as low as 0.2V, while the supply pin still has sufficient voltage for the device to function. In this way, allowing for a 1.6V drop through an opto-isolator diode, regulation down to 1.8V out can be achieved.

FEATURES
• Trimmed bandgap design - initial accuracies to ± 0.5%
• 40mA drive capability
• Wide supply voltage range - 1.5V to 15V
• Low supply current - typically 110µA
• Full industrial temperature range

APPLICATIONS
• Opto driver for very low output voltage isolated power supplies