The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 13, 1997
Filed:
Mar. 08, 1994
Baoson Nguyen, Plano, TX (US);
Fernando D Carvajal, McKinney, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A low voltage drop out circuit (10) has a voltage regulating transistor (13) between a supply voltage (12) and an output terminal (28). An active feedback loop controls the voltage regulating transistor (13) according to a magnitude of the supply voltage (12) to control the voltage on the output terminal (28). A reference voltage source (25) produces a reference voltage, and a switch, which may be a second transistor (45) of similar type than the voltage regulating transistor (13), is connected in parallel with the voltage regulating transistor (13). A comparing circuit (42) detects when the supply voltage (12) falls below the reference voltage (25) to operate the second transistor (45), which may be sized to be much larger than the voltage regulating transistor (13) to effectively short across the voltage regulating transistor (13) when the supply voltage (12) falls below a predetermined level.