Patent ID: 7612588
Filing Date: 2009-11-03
Classification: H03K

Abstract:
1. A power on detection circuit comprising: a converting means for converting input voltage into converted current that is proportional to an absolute temperature and outputting the converted current; a first connection node supplied with the converted current from the converting means; a first current source supplied with the converted current from the first connection node, wherein the first current source generates a flow of first current that is proportional to absolute temperature and outputs the first current at a value that is the same as the value of the converted current when the input voltage becomes equal to a target voltage; a first filter connected to the first connection node; and a latching means for outputting and holding a power on detection signal corresponding to a potential at the first connection node that is generated by the first filter when the value of the first current exceeds the value of the converted current, wherein the latching means provides a feedback signal to the converting means when the value of the first current exceeds the value of the converted current, and the converting means stops the output of the converted current in accordance with the feedback signal.