CN113110156B - LDO chip and intelligent wearable device - Google Patents
LDO chip and intelligent wearable device Download PDFInfo
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- CN113110156B CN113110156B CN202110374890.2A CN202110374890A CN113110156B CN 113110156 B CN113110156 B CN 113110156B CN 202110374890 A CN202110374890 A CN 202110374890A CN 113110156 B CN113110156 B CN 113110156B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
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- G05B2219/24215—Scada supervisory control and data acquisition
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Abstract
The invention discloses an LDO chip and intelligent wearable equipment, wherein the LDO chip comprises: the power supply comprises a power supply input pin, a power supply output pin and an enabling pin; the enabling pin is used for receiving an on/off control signal; the LDO chip body is electrically connected with the power input pin, the power output pin and the enabling pin respectively; the LDO chip body is used for working when receiving the starting-up control signal so as to output the power input pin after the power input pin is connected with the power supply is subjected to voltage reduction to the power output pin; and stopping working when the shutdown control signal is received. The invention can realize the on-off of the equipment by controlling the LDO chip under the condition that the hardware cost of the equipment is not increased, and is beneficial to reducing the production cost of the equipment and the standby power consumption after the equipment is turned off.
Description
Technical Field
The invention relates to the technical field of LDO chips, in particular to an LDO chip and intelligent wearable equipment.
Background
The wearable device is a portable electronic product that can be worn directly on the person or integrated into the clothing or accessories of the person. Wearable equipment is not only a hardware equipment, can realize powerful function through software support and data interaction, high in the clouds interaction more, and wearable equipment has brought huge transition to people's life, perception.
Present wearable equipment mostly uses intelligent bracelet as the main. The existing smart band is usually provided with a key, functions such as screen switching and the like are realized through the key, or the function of switching on and/or off is realized through the key, however, when the function of switching on/off is realized through the key, the smart band usually only enters a deep sleep mode, and power consumption still exists.
Disclosure of Invention
The invention mainly aims to provide an LDO chip and intelligent wearable equipment, and aims to provide the LDO chip with the on/off function, so that 0-power-consumption shutdown of the intelligent wearable equipment is realized through the LDO chip, and the production cost of the intelligent wearable equipment is reduced.
In order to achieve the above object, the present invention provides an LDO chip, including:
the power supply comprises a power supply input pin, a power supply output pin and an enabling pin; the enabling pin is used for receiving an on/off control signal;
the LDO chip body is electrically connected with the power input pin, the power output pin and the enabling pin respectively; the LDO chip body is used for working when receiving the starting-up control signal so as to output the power input pin after the power input pin is connected with the power supply is subjected to voltage reduction to the power output pin; and the number of the first and second groups,
and stopping working when the shutdown control signal is received.
Optionally, the power-on control signal is a low level signal of a first preset duration;
the shutdown control signal is a low level signal with a second preset duration, and the first preset duration is shorter than the second preset duration.
Optionally, the LDO chip body includes:
a mounting substrate;
the power switch is arranged on the mounting substrate, the input end of the power switch is connected with the power input pin, and the output end of the power switch is connected with the power output pin;
the switch control circuit is arranged on the mounting substrate and is connected with the controlled end of the power switch; the switch control circuit is used for controlling the power switch to be conducted when receiving the starting-up control signal so as to output the power input pin after the power input pin is connected with the power switch is subjected to voltage reduction to the power output pin; and controlling the power switch to be cut off when the shutdown control signal is received so as to stop power output.
Optionally, the switch control circuit comprises:
the reference voltage generating circuit is electrically connected with the power input pin to generate reference voltage;
and a first input end of the comparison amplifier is connected with the reference voltage generating circuit, a second input end of the comparison amplifier is connected with the power supply output pin, and an enabling end of the comparison amplifier is connected with the enabling pin.
Optionally, the switch control circuit further comprises:
the output voltage detection circuit is electrically connected with the power supply output pin, and the output end of the output voltage detection circuit is connected with the switch control circuit; the output voltage detection circuit is used for detecting the output voltage of the power supply output pin and outputting a voltage detection signal to the switch control circuit, so that the switch control circuit adjusts the conduction degree of the power supply switch according to the voltage detection signal.
Optionally, the power switch is any one or a combination of a plurality of MOS transistors, IGBTs, and triodes.
Optionally, the LDO chip further includes:
and the plastic package body is used for packaging the LDO chip body, and the power input pin, the power output pin and the enabling pin are partially exposed outside the plastic package body.
Optionally, the LDO chip further includes:
and the EPAD foot is arranged on one side of the plastic package body.
The invention further provides intelligent wearable equipment which comprises the LDO chip.
Optionally, the smart wearable device further comprises:
the shell comprises a bottom shell and an upper cover, and the bottom shell and the upper cover enclose to form an accommodating space;
the electric control plate is accommodated in the accommodating space, and the LDO chip is arranged on the electric control plate; the LDO chip is accommodated in the accommodating space, and the power supply battery is electrically connected with a power input pin of the LDO chip;
and the function key is arranged on the shell and electrically connected with the enabling pin, and when triggered by a user, the function key generates an on/off control signal and outputs the on/off control signal to the enabling pin of the LDO chip.
The LDO chip is provided with the enabling pin, when the level of the enabling pin jumps, the LDO chip is turned off or turned on, because the LDO chip is used for controlling the power supply of the electronic equipment, when the LDO chip works, the whole electronic equipment has power access, when the LDO chip does not work, the whole electronic equipment has no power access, and thus, the electronic equipment can be turned on/off by controlling the operation of the LDO chip. Therefore, the electronic equipment (such as intelligent wearable equipment) applying the LDO chip can be turned on/off through the keys. Under the condition that a hardware circuit is not required to be added to the intelligent wearable device and a software algorithm of the MCU is not required to be changed, the 0-power-consumption shutdown of the intelligent wearable device can be realized through the LDO chip.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of an embodiment of an LDO chip of the present invention;
FIG. 2 is a schematic diagram of another embodiment of an LDO chip of the present invention;
FIG. 3 is a schematic structural diagram of an embodiment of an LDO chip of the present invention.
The reference numbers illustrate:
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, 8230; etc.) are involved in the embodiment of the present invention, the directional indications are only used for explaining the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the figure), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The invention provides an LDO chip which is applied to intelligent wearable equipment.
Referring to fig. 1 to 3, in an embodiment of the invention, the LDO chip includes:
a power input pin VIN, a power output pin VOUT and an enable pin EN; the enable pin EN is used for receiving an on/off control signal;
the LDO chip body 10 is respectively and electrically connected with the power input pin VIN, the power output pin VOUT and the enable pin EN; the LDO chip body 10 is configured to operate when receiving the power-on control signal EN1, so as to step down a power supply accessed by the power supply input pin VIN and output the power supply to the power supply output pin VOUT; and the number of the first and second groups,
and when the shutdown control signal EN2 is received, stopping working.
The starting control signal EN1 is a low level signal with a first preset duration;
the shutdown control signal EN2 is a low level signal with a second preset duration, and the first preset duration is longer than the second preset duration.
In this embodiment, the LDO chip can be applied to intelligent wearing equipment such as intelligent wrist-watch, intelligent bracelet, and the LDO chip can supply power for main control unit, bluetooth chip, WIFI module, temperature sensor, rhythm of the heart sensor among the intelligent wearing equipment. The power input foot VIN of LDO chip can be connected with intelligent wearing equipment's battery, and the power output foot VOUT of LDO chip can be connected with intelligent wearing equipment's above-mentioned functional module to step down the electric energy of battery output and then supply power for above-mentioned module, thereby make intelligent wearing equipment normal work, realize each function of intelligent wearing equipment. In this embodiment, the LDO may be enabled at a low level, that is, the LDO chip operates when receiving a low-level power-on/power-off control signal, otherwise, the LDO chip maintains the original operating state. In practical application, a pull-up source may be set in the LDO chip body 10, or a high-level signal is input to the enable pin EN, so that the LDO chip body 10 is normally connected to the high-level normal signal, and when the start or shutdown is required, a level enable signal is provided, for example, when the start or shutdown is required, a low-level start control signal EN1 or a shutdown control signal EN2 is provided for a certain duration, so that the LDO chip is started or shut down when receiving the enable signal. As shown in fig. 3, fig. 3 shows waveforms of the power input voltage VIN, the power output voltage VOUT, and the on/off control signal EN. For example, the duration of the power-off control signal EN2 may be set to 6 to 10 seconds, the duration of the power-on control signal EN1 may be set to 1 to 4 seconds, and when a low level of a certain duration is received, the LDO chip body 10 is enabled to be triggered, and then a normal state signal of a high level may be recovered.
It should be noted that, a button is usually arranged on a shell of the intelligent wearable device, when the intelligent wearable device needs to be shut down, a shutdown control signal EN2 is generated by pressing the button of the intelligent wearable device, the shutdown control signal EN2 is received by the MCU, and the intelligent wearable device is controlled to be shut down, however, actually, the intelligent wearable device only enters a sleep state, some devices such as the MCU in the intelligent wearable device are still in a working state, so that the battery power of the intelligent wearable device is still consumed, and shutdown 0 power consumption cannot be achieved. If 0 power consumption needs to be shut down, a special power on/off circuit needs to be arranged in the intelligent wearable device, or some algorithm programs need to be integrated in the MCU for realization, so that the cost of the intelligent wearable device is higher, the size of the intelligent wearable device is limited, and more hardware circuits are difficult to be arranged on an electric control board of the intelligent wearable device.
According to the LDO chip, the enable pin EN is arranged on the LDO chip, the LDO chip is turned off or turned on when the enable pin EN jumps in level, the LDO chip is used for controlling power supply of electronic equipment, when the LDO chip works, the whole electronic equipment is connected with a power supply, when the LDO chip does not work, the whole electronic equipment is not connected with the power supply, and therefore the electronic equipment can be turned on or turned off by controlling the LDO chip to work. Therefore, the electronic equipment (such as intelligent wearable equipment) applying the LDO chip can be turned on/off through the keys. Under the condition that the intelligent wearable device does not need to increase a hardware circuit or change a software algorithm of the MCU, the 0-power-consumption shutdown of the intelligent wearable device can be realized through the LDO chip.
Specifically, in the normal working process of the electronic equipment, when the electronic equipment needs to be shut down, the keys on the electronic equipment can be pressed for a long time, so that when a second preset time low level signal is received, the LDO chip can stop working, when the electronic equipment is in a shutdown state, when the electronic equipment needs to be started, the keys of the electronic equipment are pressed for a long time, and therefore when a first preset time low level signal is received, the LDO chip can restore working. Because the LDO chip when out of work, can make other functional modules of electronic equipment not have the power access, and then make the whole shutdown state that is in of electronic equipment, can realize 0 consumption after the shutdown.
Referring to fig. 1 to 3, in an embodiment, the LDO chip body 10 includes:
a mounting substrate 13;
the power switch 11 is arranged on the mounting substrate 13, an input end of the power switch 11 is connected with the power input pin VIN, and an output end of the power switch 11 is connected with the power output pin VOUT;
a switch control circuit 12 disposed on the mounting substrate 13 and connected to a controlled terminal of the power switch 11; the switch control circuit 12 is configured to control the power switch 11 to be turned on when receiving the power-on control signal EN1, so as to step down the power supply connected to the power input pin VIN and output the power supply to the power output pin VOUT; and controlling the power switch 11 to be turned off when receiving the shutdown control signal EN2 to stop power output.
In this embodiment, the mounting substrate 13 may be any one of a lead frame, a PCB, a DBC, an aluminum substrate, and a glass fiber board, and the electronic element in the LDO chip body 10 may be a patch element, or a bare die wafer. The electronic components in the LDO chip body 10 may be bonded to the pads formed on the mounting substrate 13 by solder, conductive paste, or the like. The power switch 11 is any one or combination of a plurality of MOS tubes, IGBTs and triodes. In this embodiment, the conduction degree of the power switch 11 is adjustable, the switch control circuit 12 can control the working state of the power switch 11 according to the on/off control signal EN2, and when receiving the low-level power-on control signal EN1, the power switch 11 is controlled to be turned on, and when receiving the low-level power-off control signal EN2, the power switch 11 is controlled to be turned off. When the electronic device is turned on, the power switch 11 steps down the accessed power and outputs the power to the rear-stage power load, when the electronic device is turned off, the power switch 11 disconnects the electric connection between the power input pin VIN and the power output pin VOUT, and the electronic device using the LDO chip does not have power supply, so that the electronic device is turned off at 0 power consumption. In some embodiments, the power switch 11 is further provided with a capacitor C1, and the capacitor C1 is disposed between the output end and the controlled end of the power switch 11, and can be used to prevent the voltage output to the power switch 11 from being over-voltage, and damaging the power switch 11, and can also suppress the switching noise of the power switch 11.
Referring to fig. 1 to 3, in an embodiment, the switch control circuit 12 includes:
a reference voltage generating circuit 121 electrically connected to the power input pin VIN to generate a reference voltage;
a comparison amplifier U1, a first input terminal of the comparison amplifier U1 is connected to the reference voltage generating circuit 121, a second input terminal of the comparison amplifier U1 is connected to the power output pin VOUT, and an enable terminal of the comparison amplifier U1 is connected to the enable pin EN.
In this embodiment, the reference voltage generating circuit 121 may include a reference source I1 and a reference voltage generating circuit U2, after the LDO chip enables the power on, the power switch 11 is turned on, the first input terminal of the comparison amplifier U1 is connected to the reference source voltage, the output continuously rises along with the input, when the output is about to reach the specified value, the second input terminal is connected to the output terminal voltage, the output voltage is also close to the reference voltage value, at this time, the comparison amplifier U1 amplifies a small error signal between the output voltage and the reference voltage, thereby adjusting the conduction degree of the power switch 11, and ensuring that the output voltage is stabilized at the specified value, similarly, if the input voltage or the output current changes, the comparison amplifier U1 keeps the output voltage unchanged.
Referring to fig. 1 to 3, in an embodiment, the switch control circuit 12 further includes:
the output voltage detection circuit 123, the output voltage detection circuit 123 is electrically connected with the power output pin VOUT, and the output end of the output voltage detection circuit 123 is connected with the switch control circuit 12; the output voltage detection circuit 123 is configured to detect an output voltage of the power output pin VOUT, and output a voltage detection signal to the switch control circuit 12, so that the switch control circuit 12 adjusts the conduction degree of the power switch 11 according to the voltage detection signal.
In this embodiment, the output voltage detection circuit 123 can be implemented by a voltage divider circuit, that is, the output voltage detection circuit 123 of this embodiment includes resistors R1 and R2, after the resistors R1 and R2 are connected in series for voltage division, the output voltage detection signal is output to the comparison amplifier U1, the output voltage detection signal is applied to the second input terminal of the comparison amplifier U1A, and is compared with the reference voltage Vref applied to the first input terminal, after the difference between the two is amplified by the comparison amplifier U1A, the conduction degree of the power switch 11 is controlled, so as to control the voltage drop of the power output pin VOUT, thereby stabilizing the output voltage. When the output voltage Uout decreases, the difference between the reference voltage and the output voltage detection signal increases, the driving current output by the comparison amplifier U1 increases, the conduction degree of the power switch 11 increases, and the output voltage increases. Conversely, if the output voltage Uout exceeds the required set value, the front drive current output by the comparison amplifier U1 decreases, so that the conduction level of the power switch 11 decreases. In the power supply process, the output voltage correction is continuously performed. The output voltage detection circuit 123 may further be provided with a filter capacitor C2, and the filter capacitor C2 is connected in parallel with the resistor R1, so as to filter noise in the collected output voltage and improve detection accuracy.
Referring to fig. 1 to 3, in an embodiment, the LDO chip further includes:
and the plastic package body (not shown) is used for packaging the LDO chip body 10, and the power input pin VIN, the power output pin VOUT and the enabling pin EN are partially exposed outside the plastic package body.
In this embodiment, the plastic package body may be made of one or a combination of epoxy resin, aluminum oxide, boron nitride, aluminum nitride, polyimide, and silica gel, and the plastic package body is made of epoxy resin and aluminum oxide, which have good insulation, high thermal conductivity, and good heat resistance and thermal conductivity. When the plastic package body is manufactured, materials such as epoxy resin, aluminum oxide, boron nitride or aluminum nitride and the like can be mixed, and then the mixed packaging material is heated; after cooling, the packaging material is crushed, and then the plastic package body 100 material is roll-formed by an ingot molding process to form the plastic package body 100, so that the chip is packaged in the plastic package body 100. Or the LDO chip body 10 is fixed in the plastic package through a multi-time injection molding process. The plastic package body 100 can be a QFN or DQFN package.
Referring to fig. 1 to 3, further, the LDO chip further includes:
the EPAD foot is arranged on one side of the plastic package body;
and the grounding pin GND is used for being grounded with an external circuit.
In this embodiment, through setting up the EPAD foot, its size of the IC of QFN encapsulation can all be done very little, and EPAD can be used for connecting the inside all ground of LDO chip, is favorable to reducing the size of LDO chip for its size is less. Meanwhile, the heat dissipation of the LDO chip can be improved by utilizing the EPAD. Due to the fact that the size is small, the thermal resistance of the LDO chip is large, the heat dissipation efficiency is in inverse proportion to the thermal resistance, and the heat dissipation efficiency of the LDO chip can be improved by arranging the EPAD.
The power input foot VIN of this embodiment, power output foot VOUT, enable foot EN, ground connection foot GND and EPAD foot encapsulation are in the plastic packaging body, and the plastic packaging body, an organic whole sets up between chip body 10 and the mounting substrate 13, only supply to expose in the surface of plastic packaging body with PCB board welded weld part, compare in gull wing's type pin and cut straightly the type pin, the weld part and the automatically controlled board parallel arrangement of this embodiment pin, pass through soldering tin with the pin, electrically conductive glue is fixed in automatically controlled board, the second weld part and the automatically controlled board laminating of pin, and then can improve chip pin 30's fixity, be favorable to preventing automatically controlled board when falling, lead to the pin fracture. It can be understood that the plastic package body generally has insulation and electromagnetic shielding properties, and the pin is packaged in the plastic package body, so that the electromagnetic interference resistance of the integrated chip can be improved.
The invention further provides intelligent wearable equipment which comprises the LDO chip. The detailed structure of the LDO chip can refer to the above embodiments, and is not described herein again; it can be understood that, because the LDO chip is used in the intelligent wearable device of the present invention, embodiments of the intelligent wearable device of the present invention include all technical solutions of all embodiments of the LDO chip, and the achieved technical effects are also completely the same, and are not described herein again.
Wherein, intelligence wearing equipment still includes:
the shell comprises a bottom shell and an upper cover, and the bottom shell and the upper cover are enclosed to form an accommodating space;
the electric control plate is accommodated in the accommodating space, and the LDO chip is arranged on the electric control plate; the LDO chip is characterized by also comprising a power supply battery, wherein the power supply battery is accommodated in the accommodating space and is electrically connected with a power input pin VIN of the LDO chip;
the function button, set up in on the shell, the function button with enable foot EN electricity is connected, when the function button is triggered by the user, produce power on/off control signal EN2, and export extremely the enable foot EN of LDO chip.
In this embodiment, the power supply battery includes a storage battery for storing electric energy, and is connected with the LDO chip. The storage battery can be realized by adopting a rechargeable battery such as a lithium ion storage battery or a nickel-hydrogen battery. The LDO chip carries out step-down processing with the electric energy of battery and then exports, provides for other circuit module of intelligence wearing equipment. One end of the function key can be grounded, the other end of the function key is electrically connected with the enable pin EN, and when the function key is pressed down, the function key outputs a low-level starting signal or a low-level shutdown signal to the enable pin so as to control the LDO chip to start working or stop working.
The intelligent wearable device realizes the functions of starting up, shutting down and the like through one key. The shell of the intelligent wearable device is provided with the keys, so that the starting and shutdown functions of the whole machine can be realized through one key, the operation of a user is facilitated, and the use experience of the user is improved; because the button of design is small in quantity, not only make intelligent wearing equipment have better outward appearance, make circuit structure simpler moreover, easily realize the cost is reduced, still be favorable to reducing intelligent wearing equipment's consumption, be favorable to improving intelligent wearing equipment's competitiveness.
The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. An LDO chip, comprising:
the power supply comprises a power supply input pin, a power supply output pin and an enabling pin; the enabling pin is used for receiving an on/off control signal;
the starting control signal is a low level signal with a first preset duration;
the shutdown control signal is a low level signal with a second preset duration, and the first preset duration is shorter than the second preset duration;
the LDO chip body is electrically connected with the power input pin, the power output pin and the enabling pin respectively; the LDO chip body comprises a power switch and a capacitor, the input end of the power switch is connected with the power input pin, the output end of the power switch is connected with the power output pin, and the capacitor is arranged between the output end of the power switch and a controlled end;
the LDO chip body also comprises a pull-up source which is used for enabling the LDO chip body to be constantly connected with a high-level normal signal;
the LDO chip body is used for working when receiving the starting-up control signal so as to output the power input pin after the power input pin is connected with the power supply is subjected to voltage reduction to the power output pin; and (c) a second step of,
and when the shutdown control signal is received, stopping outputting the voltage to a rear-stage power load so as to realize power-consumption-free shutdown.
2. The LDO chip of claim 1, wherein the LDO chip body comprises:
a mounting substrate on which the power switch is disposed;
the switch control circuit is arranged on the mounting substrate and is connected with the controlled end of the power switch; the switch control circuit is used for controlling the power switch to be conducted when receiving the starting-up control signal so as to output the power input pin after the power input pin is connected with the power switch is subjected to voltage reduction to the power output pin; and controlling the power switch to be cut off when the shutdown control signal is received so as to stop power output.
3. The LDO chip of claim 2, wherein the switch control circuit comprises:
the reference voltage generating circuit is electrically connected with the power input pin to generate reference voltage;
and a first input end of the comparison amplifier is connected with the reference voltage generating circuit, a second input end of the comparison amplifier is connected with the power supply output pin, and an enabling end of the comparison amplifier is connected with the enabling pin.
4. The LDO chip of claim 2, wherein the switch control circuit further comprises:
the output voltage detection circuit is electrically connected with the power supply output pin, and the output end of the output voltage detection circuit is connected with the switch control circuit; the output voltage detection circuit is used for detecting the output voltage of the power supply output pin and outputting a voltage detection signal to the switch control circuit, so that the switch control circuit adjusts the conduction degree of the power supply switch according to the voltage detection signal.
5. The LDO chip of claim 4, wherein the power switch is any one or more of a MOS transistor, an IGBT, and a triode.
6. The LDO chip of claim 4, further comprising:
and the plastic package body is used for packaging the LDO chip body, and the power input pin, the power output pin and the enabling pin are partially exposed outside the plastic package body.
7. The LDO chip of claim 6, further comprising:
and the EPAD foot is arranged on one side of the plastic package body.
8. An intelligent wearable device, comprising the LDO chip of any of claims 1 to 7.
9. The smart wearable device of claim 8, further comprising:
the shell comprises a bottom shell and an upper cover, and the bottom shell and the upper cover are enclosed to form an accommodating space;
the electric control plate is accommodated in the accommodating space, and the LDO chip is arranged on the electric control plate; the power supply battery is accommodated in the accommodating space and is electrically connected with a power input pin of the LDO chip;
and the function key is arranged on the shell and electrically connected with the enabling pin, and when triggered by a user, the function key generates an on/off control signal and outputs the on/off control signal to the enabling pin of the LDO chip.
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