| 摘要 |
A semiconductor integrated circuit device for a power source capable of being expanded to cope with an increase or decrease in the load includes an outer transistor attached to the outer side of an IC, and a transistor incorporated thereon simultaneously operated to enhance the current output capability of a linear regulator when a load is great. A control circuit controls the transistor to produce a constant voltage, and controls the outer transistor to control the current ratio of the current flowing into the transistor and the current flowing into the outer transistor. An over-current detecting circuit detects, at one time, the collector currents of the transistors flowing into the output line, and executes an over-current protection control based on the detected values.
|
