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US 10,382,030 B2Granted
Apparatus having process, voltage and temperature-independent line transient management
AssigneeTexas Instruments Incorporated
InventorsShanmuganand Chellamuthu, Kemal Safak Demirci, Anand Gopalan
Life of this patent
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Abstract
A voltage regulator and a gate control circuit for an aid transistor coupled to assist a pass element for the voltage regulator during line transients having a given slope are disclosed. The gate control circuit includes a first circuit coupled to receive an output voltage of the voltage regulator on a first node and to provide a gate control voltage that mirrors the output voltage on a second node. A low pass filter is coupled to receive the gate control voltage and to provide a filtered gate control voltage to the gate of the aid transistor.
Claims20
A circuit comprising:
- (a) a supply rail, a ground rail, and an output node;
- (b) a pass transistor having a source and drain coupled between the supply rail and the output node and having a gate;
- (c) first and second resistors coupled between the output node and the ground rail and forming a voltage divider;
- (d) an error amplifier having a reference voltage input, an input coupled to between the first and second resistors, and an output coupled to the gate of the pass transistor;
- (e) an aid transistor having a source and drain coupled in series between the supply rail and the output node and having a gate;
- and
- (f) gate control circuitry coupled between the supply rail and the ground rail, the gate control circuitry including:
- (i) current mirror circuitry having a mirror input coupled to the output node and a gate control output;
- and
- (ii) filter circuitry having a filter input coupled to the gate control output and having a filtered gate control output coupled to the gate of the aid transistor.
7 more elements
A circuit comprising:
- (a) a supply rail, a ground rail, and an output node;
- (b) a pass transistor having a source and drain coupled between the supply rail and the output node and having a gate;
- (c) first and second resistors coupled between the output node and the ground rail and forming a voltage divider;
- (d) an error amplifier having a reference voltage input, an input coupled to between the first and second resistors, and an output coupled to the gate of the pass transistor;
- (e) an aid transistor having a source and drain coupled in series between the ground rail and the output node and having a gate;
- and
- (f) gate control circuitry coupled between the supply rail and the ground rail, the gate control circuitry including:
- (i) current mirror circuitry having a mirror input coupled to the output node and a gate control output;
- and
- (ii) filter circuitry having a filter input coupled to the gate control output and having a filtered gate control output coupled to the gate of the aid transistor.
7 more elements
A circuit comprising:
- (a) a supply rail, a ground rail, and an output node;
- (b) a pass transistor having a source and drain coupled between the supply rail and the output node and having a gate;
- (c) first and second resistors coupled between the output node and the ground rail and forming a voltage divider;
- (d) an error amplifier having a reference voltage input, an input coupled to between the first and second resistors, and an output coupled to the gate of the pass transistor;
- (e) a first aid transistor having a source and drain coupled in series between the supply rail and the output node and having a gate;
- (f) first gate control circuitry coupled between the supply rail and the ground rail, the first gate control circuitry including:
- (i) first current mirror circuitry having a first mirror input coupled to the output node and a first gate control output;
- and
- (ii) first filter circuitry having a filter input coupled to the first gate control output and having a first filtered gate control output coupled to the gate of the first aid transistor;
- (g) a second aid transistor having a source and drain coupled in series between the output node and the ground rail and having a gate;
- (f) second gate control circuitry coupled between the supply rail and the ground rail, the second gate control circuitry including:
- (i) second current mirror circuitry having a second mirror input coupled to the output node and a second gate control output;
- and
- (ii) second filter circuitry having a filter input coupled to the second gate control output and having a second filtered gate control output coupled to the gate of the second aid transistor.
11 more elements
Dependencies are inferred from the claim text.