Linear voltage regulator with selectable light and heavy...

Details Linear voltage regulator with selectable light and heavy... Linear voltage regulator with selectable light and heavy...

2006-09-12

2006-09-12

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

Reexamination Certificate

active

07106032

ABSTRACT:
A light-load power transistor and a heavy-load power transistor are connected in parallel between an input voltage and an output voltage. The light-load power transistor has a smaller current driving capability, i.e. a smaller dimension of a current path. During a light-load mode, only is the light-load power transistor activated to reduce the current consumption caused by an error amplifier, thereby enhancing the efficiency. When a detection current signal is higher than a threshold current signal, the heavy-load power transistor is additionally activated through a gate control circuit by a mode selection circuit, thereby achieving a sufficient current driving capability.

REFERENCES:
patent: 4779037 (1988-10-01), LoCascio
patent: 5528127 (1996-06-01), Streit
patent: 6246221 (2001-06-01), Xi
patent: 6469480 (2002-10-01), Kanakubo
patent: 6677735 (2004-01-01), Xi
patent: 6677737 (2004-01-01), Hamon et al.
patent: 6806690 (2004-10-01), Xi

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