Fast transient response circuit applied to LDO

A transient response, circuit technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve problems affecting circuit stability, LDO circuit output voltage fluctuations, affecting the normal operation of chips, etc., to achieve bandwidth and slew The effect of increased rate and increased response speed

Pending Publication Date: 2019-01-01
拓尔微电子股份有限公司
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Problems solved by technology

[0003] Although LDO has many advantages in related circuit design at this stage, the problem of transient response has always been a difficult problem in related design fields.
When the LDO chip works under normal voltage, the current of the external load often changes. If the LDO circuit does not respond to the load transient in time, the output voltage of the LDO circuit will fluctuate greatly, which will affect the normal o

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  • Fast transient response circuit applied to LDO
  • Fast transient response circuit applied to LDO
  • Fast transient response circuit applied to LDO

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[0025] The present invention will be further described below in conjunction with the drawings and embodiments.

[0026] In order to solve the extra influence of the external capacitor on the LDO circuit, the present invention adopts an LDO circuit without external large capacitors. By improving the internal circuit of the LDO, the fast transient response capability of the LDO can be enhanced without reducing other performance of the circuit.

[0027] The fast transient response circuit applied to LDO includes P-channel enhanced MOS transistors MP1-MP9, N-channel enhanced MOS transistors MN1-MN3, voltage divider resistors R1 and R2, external fixed bias circuit module and load sampling The circuit module also includes Vcc port, VREF port, Vb port and Vout port. The Vcc port is connected to the power input terminal, the VREF is connected to the reference voltage terminal, the Vb port is connected to an external bias, and the Vout port is an output port of the overall circuit.

[0028] ...

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Abstract

The invention provides a fast transient response circuit applied to an LDO (low-dropout linear voltage stabilizer). An LDO circuit without out-of-chip bulk capacitor is adopted, the fast transient response capacity of the LDO can be enhanced by improving an internal circuit of the LDO, and other performances of the circuit cannot be weakened. The tail current of EA is divided into two parts: one part adopts fixed current bias, and the other part adopts the current from output load sampling; the static current of a chip cannot be increased in the circuit, and the response speed of the loop is also increased along with the increase of the bandwidth and the slew rate of the loop when the load is suddenly increased.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to an LDO circuit. Background technique [0002] With the rapid development of integrated circuit technology, more and more related electronic products are used in daily life, and the performance requirements for related integrated circuit chips are also becoming higher. Low-dropout linear regulators (LDOs) are widely used in integrated circuits, especially low-power circuits, due to a series of characteristics such as low dropout voltage, low noise, and low power consumption. [0003] Although LDO has many advantages in related circuit design at this stage, the problem of transient response has always been a difficult problem in related design fields. When the LDO chip works under normal voltage, the current of the external load often changes. If the LDO circuit does not respond to the load transient in time, the output voltage of the LDO circuit will fluctuate greatly, which wi...

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Application Information

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IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 方建平李红艳张适
Owner 拓尔微电子股份有限公司
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