Description

The SC4431 is a four terminal device for regulating an isolated power supply with output voltages down to 1.5V.

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 the device to function in conjunction with an opto-isolator. SC4431 achieves this by having seperate supply and output pins, allowing the output to sink current at voltages as low as 0.1V, while the supply pin still has sufficient voltage for the device to function. In this way, allowing for a 1.4V drop through an opto-isolator diode, regulation down to 1.5V out can be achieved.

Features

◆ Open Collector output drives Optoisolator with as little as 1.5V input voltage

◆ Trimmed bandgap design - initial accuracies to + 0.5

◆ 40mA drive capability

◆ Regulates output as low as 50mV

◆ Wide supply voltage range - 1.5V to 15V

◆ Low supply current - typically 110µA

◆ Full industrial temperature range

◆ SOT-23 5 lead package

Applications

◆ Telecom Power Supplies

◆ Opto driver for very low output voltage (1.5V) isolated power supplies

◆ Battery operated applications

◆ Point of use power supplies

SC4431属于集成电路（IC） > 电压基准。Semtech Corporation制造生产的SC4431电压基准产品属于基准电压源系列，可通过相对较不稳定的电源提供稳定的电势，电压值始终保持恒定，以便在测量、控制和类似应用中用作比较的标准。其功能行为可能与用于大功率调节的线性稳压器相似，但基准电压源器件却不适合用于此类用途。用作比较标准时，若输出电流容量或实际负载电流增大，其性能通常会降低。