Voltage regulator has voltage detector function inside

Voltage regulator has voltage detector function inside

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By Christoph Hammerschmidt

Developed by the Ricoh Europe Semiconductor Support Center, the R5112 has 42V maximum input voltage and 200mA output current with an absolute maximum rating of 50V, tolerates load-dump peak voltages of 60V (<200ms) and has a consumption of only 3.8µA. The operating temperature range varies from -40°C to 105°C for consumer applications and up to 125°C for automotive and industrial use. Meanwhile, the output voltage and threshold voltage has an accuracy of ±0.6%, as well as a low temperature drift coefficient of ±60ppm/°C, which make the device suitable as a high reliable power source.


As for protection circuits, the R5112 comprises an output short-circuit, an overcurrent and a thermal shutdown protection circuit in addition to the basic voltage regulator circuits.


The additional embedded voltage detector is used to monitor a voltage level and provides a reset signal on the output as soon the voltage drops below a specified threshold voltage. The designer has the option to select between a version monitoring the output of the voltage regulator and a version monitoring a voltage source of preference by an individual sense pin. The output of the voltage detector can be used to reset a processor IC when its supply voltage drops below a critical minimum level. The actual length of the reset period can be specified by the value of an external capacitor. This device is offered in an 8-pin HSOP-8E package with high power dissipation capability.


The products for industrial and automotive applications both passed an additional screening at high temperature and exposure to an extended reliability test period. Automotive products are ranked upon purpose: Safety-critical parts, General equipment or Accessories. These devices (except the latter category) are also tested at low temperature. The R5112 is designed for general equipment as well as accessories and is scheduled to become AEC-Q100 compliant.





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