Low dropout linear regulator based on fast short circuit protection
A low-dropout linear and short-circuit protection technology, which is applied in the direction of instruments, control/regulation systems, and adjustment of electrical variables, can solve the problems of large current flow, burnout of MOS tube MP, and large temperature rise, so as to reduce the instantaneous large current , Improve stability and safety, shorten the effect of current maintenance time
Active Publication Date: 2022-07-22
3PEAK INC
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Problems solved by technology
There are many protection mechanisms in the LDO, including overcurrent protection, and when the output voltage VOUT is quickly short-circuited to ground, especially when the quiescent current is low IQ (1μA to several μA), the overcurrent protection circuit has not been established, and the MOS tube MP is due to The gate-to-source voltage is too high instantaneously, causing a large current to flow. figure 2 The large current shown can reach about 989mA, and the overall duration is about 218μs. The instantaneous power consumption will cause a large temperature rise and burn out the MOS tube MP
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[0026] The present invention will be described in detail below with reference to the various embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and the structural, method, or functional transformations made by those of ordinary skill in the art based on these embodiments are all included in the protection scope of the present invention.
[0027] The invention discloses a low-dropout linear voltage regulator based on fast short-circuit protection, comprising:
[0028] The LDO unit includes an error amplifier AMP, a MOS transistor MP, and voltage dividing resistors R1 and R2. The load current in the LDO unit is IL, the power supply voltage is VIN, the output voltage is VOUT, and the output capacitor is CL;
[0029] The fast short circuit protection unit is arranged between the MOS transistor MP and the power supply voltage VIN, and is used to realize the fast short circuit protection of the LDO unit;
[0030] The contr...
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The invention discloses a low-dropout linear regulator based on fast short-circuit protection. The low-dropout linear regulator includes: an LDO unit, including an error amplifier AMP, a MOS tube MP, and voltage divider resistors R1 and R2; fast short-circuit protection The unit is arranged between the MOS tube MP and the power supply voltage VIN, and is used to realize the fast short-circuit protection of the LDO unit; the control unit is connected with the MOS tube MP and the fast short-circuit protection unit, and the control and protection unit is turned off when the LDO unit is working normally. When a quick short circuit occurs in the LDO unit, the protection unit is controlled to be turned on. The low-dropout linear regulator of the present invention detects the gate-source voltage of the MOS transistor MP through the control unit, thereby controlling the on and off of the fast short-circuit protection unit, and turns off the MOS transistor MP during fast short-circuit to realize fast short-circuit protection, which greatly reduces the The instantaneous large current in the MOS tube MP effectively shortens the current maintenance time and improves the stability and safety of the LDO.
Description
technical field [0001] The invention belongs to the technical field of low-dropout linear voltage regulators, in particular to a low-dropout linear voltage regulator based on fast short-circuit protection. Background technique [0002] Low dropout regulator (LDO) has the advantages of low output noise, simple circuit structure, small chip area and small voltage ripple, and has become an important circuit in power management chips. Low dropout linear regulators can provide power supplies with low output ripple for noise-sensitive circuits such as analog circuits and RF circuits, and because of their relatively simple structure and few external components, they are widely used in SoCs. [0003] ginseng figure 1 As shown, the LDO in the prior art mainly includes an error amplifier AMP, a MOS transistor MP, voltage dividing resistors R1 and R2, and a load (the load current is IL, and the output capacitor is CL). The basic principle of LDO is: the error amplifier AMP is used to...
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IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 陈春鹏
Owner 3PEAK INC