Integrated circuit with improved battery protection

Details Integrated circuit with improved battery protection Integrated circuit with improved battery protection

1990-12-20

1992-10-27

Hille, Rolf

357 2313, 357 48, H01L 2702

Patent

active

051594269

ABSTRACT:
A battery-backed integrated circuit, which receives battery power to maintain data (or logic states) when the system (external) power supply goes down. The battery power input is connected through a diode, so that the battery cannot be charged when the system power supply is active. The battery isolation diode is a junction diode, which is surrounded by a second junction. The battery junction collects minority carriers which will be generated when the battery protection diode is forward biased (i.e. when the integrated circuit is being powered from the battery). Otherwise, minority carriers can diffuse to other junctions, to cause leakage currents which can significantly degrade the lifetime of a low-powered device.

REFERENCES:
patent: 4631567 (1986-12-01), Kokado et al.
patent: 4713555 (1987-12-01), Lee
patent: 4857985 (1989-08-01), Miller
patent: 4862310 (1989-08-01), Harrington, III
patent: 4980746 (1990-12-01), Harrington, III

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