Stmicroelectronics S.a.

Alexandre Pons

Christophe Bernard

C&eacute;cile Hamon

Cécile Hamon

Fabienne Grigis

A low dropout voltage (LDO) regulator comprises an output stage (EtS) of the amplifier (AMP), which has a main output and n auxiliary outputs which can respectively deliver a main control voltage (V) and n auxiliary control voltages (V, . . . , V); and a power stage (EtP) which has a main power transistor (PmosPrinc), controlled at its gate by the main control voltage (V), and p power modules (module, . . . , module n) of identical layout with p less than or equal to n, respectively having p auxiliary power transistors (PMos, . . . , PMosn) each controlled at their gate by p auxiliary control voltages (V, . . . , V). The number p is selected as a function of an intended maximum output current.

Integrated circuit with modulable low dropout voltage regulator

A voltage regulator having an output terminal adapted to being connected to a load, including an operational amplifier having its non-inverting input connected to a reference voltage, and its inverting input connected to the output terminal, an inverting amplifier having its input connected to the output of the operational amplifier, a capacitive impedance connected between the input and the output of the inverting amplifier, a power switch controlled by the output of the inverter amplifier, arranged to connect the output terminal to a first supply voltage, said capacitive impedance including a short-circuitable portion associated with active short-circuit means when the current flowing through the load is greater than a predetermined current.

Voltage regulator with enhanced stability

A voltage regulator having an output terminal adapted to being connected to a load, including an operational amplifier having its non-inverting input connected to a first reference voltage, and its inverting input connected to the output terminal, an inverting stage having its input connected to the output of the operational amplifier, a power switch controlled by the output of the inverter stage, arranged between the output terminal and a supply voltage, and a charge capacitor arranged between the output terminal and a reference supply voltage, including a means for reducing the effective output impedance of the operational amplifier.

Voltage regulator with reduced open-loop static gain

A linear regulator having an output stage including first and second P-channel MOS transistors series connected between a first D.C. supply terminal and an output terminal providing a regulated output voltage, and a circuit for controlling the first and second transistors capable of providing the first and second transistors with first and second control signals according to the output voltage and to the voltage at the midpoint of the series connection.

Linear voltage regulator

A voltage regulator having an output terminal adapted to being connected to a load, including a device for limiting the current flowing through the load to a first threshold current if the voltage of the output terminal is lower than a threshold voltage, and to a second current threshold higher than the first current threshold if the voltage of the output terminal is greater than the threshold voltage.

Voltage regulator protected against short-circuits by current limiter responsive to output voltage

A voltage regulator having an output terminal provided for being connected to a load, including an amplifier having its inverting input connected to a reference voltage, and its non-inverting input connected to the output terminal, a charge capacitor arranged between the output terminal and a first supply voltage, first and second voltage-controlled switches each arranged to connect a second supply voltage and the output terminal, and a control means adapted to providing a voltage depending on the output voltage of the amplifier, on the one hand, to the gate of the first switch and, on the other hand, when the current flowing through the first switch reaches a predetermined threshold, to the gate of the second switch.

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Fontaine, France

Alexandre Pons