Cascaded multi-supply power supply
AssigneeATI Technologies ULC
InventorRoddi MacInnes
Life of this patent
Estimating the term…
Abstract
A multi-supply power supply circuit has a first power supply regulating circuit that produces a first power supply voltage; and a second power supply regulating circuit that receives the first power supply voltage form the first power supply regulating circuit as an enable input signal and is operative to produce a second and different power supply voltage. In one embodiment, the first power supply voltage may reach a steady state condition prior to the second power supply voltage reaching a steady state condition. In one example, the multi-supply power supply circuit includes a plurality of cascaded low drop out power supply regulating circuits.
Claims12
A multi-supply power supply circuit comprising:
- a first power supply regulating circuit operative to produce a first power supply voltage;
- and
- a second power supply regulating circuit operatively coupled to receive the first power supply voltage from the first power supply regulating circuit as an enable input signal and operative to produce a second and different power supply voltage.
An apparatus comprising:
- a limited power source;
- multi-supply power supply circuit comprising:
- a first power supply regulating circuit, operatively coupled to the limited power source, operative to produce a first power supply voltage;
- a second power supply regulating circuit, operatively coupled to the limited power source, operatively coupled to receive the first power supply voltage from the first power supply regulating circuit as an enable input signal and operative to produce a second and different power supply voltage;
- wherein the first power supply regulating circuit is operative to produce the first power supply voltage at a steady state condition prior to the second and different power supply voltage of the second power supply regulating circuit reaching a steady state condition and wherein the first power supply voltage is higher than the second and different power supply voltage;
- and
- a circuit operatively coupled to both the first power supply voltage and to the second and different power supply voltage.
A handheld apparatus comprising:
- a display;
- a removable limited power source;
- multi-supply power supply circuit comprising:
- a first low drop out power supply regulating circuit, operatively coupled to the limited power source, operative to produce a first power supply voltage;
- a second low drop out power supply regulating circuit, operatively coupled to the limited power source, operatively coupled to receive the first power supply voltage from the first power supply regulating circuit as an enable input signal and operative to produce a second and different power supply voltage;
- wherein the first power supply regulating circuit is operative to produce the first power supply voltage at a steady state condition prior to the second and different power supply voltage of the second power supply regulating circuit reaching a steady state condition and wherein the first power supply voltage is higher than the second and different power supply voltage;
- and
- an image processing circuit operatively coupled to the display and to both the first power supply voltage and to the second and different power supply voltage.
An apparatus comprising:
- a first power supply regulating circuit operative to produce a first power supply voltage;
- a second power supply regulating circuit operative to receive the first power supply voltage from the first power supply regulating circuit as an input signal and operative to produce a second and different power supply voltage, wherein the first and second power supply regulating circuits are configured in a manner so that they are self-sequencing.
Dependencies are inferred from the claim text.