Integrated circuit with improved battery protection

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

1989-04-28

1990-12-25

Hille, Rolf

357 41, 357 48, H01L 2702

Patent

active

049807463

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 second 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: 4303958 (1988-12-01), Allgood
patent: 4626882 (1986-12-01), Cottrell et al.
patent: 4628341 (1986-12-01), Thomas
patent: 4647956 (1987-03-01), Shrivastava et al.

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