US 11,809,208 B2
Shunt regulator
Tsutomu Tomioka, Tokyo (JP)
Assigned to ABLIC Inc., Nagano (JP)
Filed by ABLIC Inc., Tokyo (JP)
Filed on Jan. 25, 2022, as Appl. No. 17/584,314.
Claims priority of application No. 2021-064500 (JP), filed on Apr. 6, 2021.
Prior Publication US 2022/0317714 A1, Oct. 6, 2022
Int. Cl. G05F 1/613 (2006.01); G11C 7/10 (2006.01)
CPC G05F 1/613 (2013.01) [G11C 7/1069 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A shunt regulator, comprising:
an output terminal, connected to a power supply terminal via an external resistor;
a capacitor, connected between the output terminal and a ground terminal;
a voltage divider circuit, connected in series between the output terminal and the ground terminal;
an output transistor, connected between the output terminal and the ground terminal;
a first reference voltage circuit, outputting a first reference voltage;
an error amplifier, controlling the output transistor based on a voltage at an output terminal of the voltage divider circuit and the first reference voltage;
a non-volatile memory;
a memory control circuit, outputting a data read signal to the non-volatile memory; and
a voltage detection circuit, detecting that a voltage at the output terminal has reached a predetermined voltage which permits a data reading operation of the non-volatile memory, and outputting a detection signal to the memory control circuit, wherein
an operating current of the non-volatile memory is supplied from the capacitor.