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Linear voltage regulator with ultralow differential voltage and strong driving capacity

A linear regulator and driving capability technology, applied in the direction of instruments, regulating electrical variables, control/regulating systems, etc., can solve the problem of linear regulator voltage drop, etc., achieve strong driving capability, save chip area, and improve efficiency. Effect

Inactive Publication Date: 2009-12-30
NANJING MICRO ONE ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0028] Direct use of NMOS leads to high voltage drop of the linear regulator, which cannot meet the occasions with high efficiency requirements

Method used

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  • Linear voltage regulator with ultralow differential voltage and strong driving capacity
  • Linear voltage regulator with ultralow differential voltage and strong driving capacity
  • Linear voltage regulator with ultralow differential voltage and strong driving capacity

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Embodiment Construction

[0046] The invention provides a linear voltage regulator with ultra-low dropout and large driving capacity ( image 3 ), based on a circuit composed of a drive circuit (Buffer) (3), a feedback network (4) for resistive voltage division, an error amplifier (2), a reference circuit (1), and a load (5), and is characterized in that it also includes an NMOS An output tube (7) and a positive boost charge pump circuit (8), wherein:

[0047]The NMOS output tube (7) is configured to receive the voltage signal output by the driver circuit (Buffer) (3), and provide corresponding current to the load (5);

[0048] The forward boost charge pump circuit (8) is configured to receive the voltage signal VIN outside the linear regulator and supply power to the drive circuit (Buffer) (3).

[0049] By introducing a charge pump circuit (Chargepump) to increase the gate potential of the NMOS drive tube, the problem of high voltage drop of the linear regulator caused by the use of NMOS can be well ...

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Abstract

A linear voltage regulator with ultralow differential voltage and strong driving capacity is based on a circuit which consists of a drive circuit (Buffer), a feedback network with resistance voltage division, an error amplifier, a reference circuit and a load. The linear voltage regulator is characterized by further comprising an NMOS output tube and a forward voltage boosting charge pump circuit, wherein, the NMOS output tube is configured for receiving a voltage signal output by the drive circuit (Buffer) and providing corresponding current to the load; and the forward voltage boosting charge pump circuit is configured for receiving a voltage signal VIN from other than the linear voltage regulator and supplying power to the drive circuit (Buffer). The linear voltage regulator is especially suitable for occasions that input voltage and output voltage are close to each other, and can provide relatively strong driving capacity, thus obviously improving efficiency. The linear voltage regulator has the advantages of saving chip area, lowering cost and having very strong practicability on the premise of ensuring two performances of low voltage drop and strong driving capacity.

Description

Technical field [0001] The invention relates to an analog integrated circuit, which belongs to a linear voltage regulator, in particular to a linear voltage regulator with ultra-low dropout and large driving capacity. Background technique [0002] Linear regulator (Low Dropout Regulator) is a kind of power management IC, which is widely used in portable devices. Compared with DC-DC (direct current-direct current) converters using inductors, it has the characteristics of low cost, low noise, and low quiescent current. At the same time, because there is no inductor, there is no EMI problem. [0003] A traditional linear regulator usually consists of a PMOS output transistor, a drive circuit (Buffer), a resistor divider feedback network, an error amplifier, and a reference circuit. The reference circuit usually adopts a bandgap reference (Bandgap reference), which generates a reference potential that hardly changes with the working environment such as temperature and power sup...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 王海波
Owner NANJING MICRO ONE ELECTRONICS
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