Multifunctional protection load switch chip

Abstract

The utility model provides a multifunctional protection load switch chip which has overvoltage, undervoltage, overheating and reverse current protection functions. The multifunctional protection load switch chip comprises a chip main body, and the chip main body is provided with a control logic module, an overvoltage protection module OVP, a current limit comparator Current Limit, an undervoltage protection module UVLO, a low-offset comparator COMP, a charge pump, an overheat protection module Thermal Shutdown, and MOS tubes Q1 and Q2. The chip body is further provided with a power input pin VIN, an output pin VOUT, a power switch pin ON, a grounding pin GND, a current setting pin ISET and a diagnosis pin OCFLAGB.

Description

TECHNICAL FIELD

[0001] The utility model relates to load switch technical field, concretely is a kind of multifunctional protective load switch chip. BACKGROUND

[0002] Under the domestic intelligent manufacturing prospect, promote the energy conservation and emission reduction of each industry, load switch is a kind of general power switch device, mainly applied to industrial control and automobile industry etc., in addition, with the development of portable electronic products, such as PDA, mobile phone, digital camera etc. delicate product, in order to save electric energy, in addition to the application of high-efficiency power management IC, load switch also needs to be applied, and due to the diversity of power environment, the load switch structure of existing use needs to have multiple protection functions in the process of turn-on and cut-off, and the current load switch structure is still relatively lacking, so it cannot meet the use demand of complex circuit. SUMMARY

[0003] For the above problems, the utility model provides a kind of multifunctional protective load switch chip, it has overvoltage, undervoltage, overheat and reverse current protection function.

[0004] The utility model adopts following technical scheme, a kind of multifunctional protective load switch chip, including chip main body, the chip main body is provided with control logic module Control Logic, overvoltage protection module OVP, current limit comparator Current Limit, undervoltage protection module UVLO, low drift comparator COMP, charge pump Charge Pump, overheat protection module Thermal Shutdown, MOS tube Q1, Q2, the chip main body is also provided with power input pin V IN , output pin V OUT , power switch pin ON, ground pin GND, current setting pin I SET , diagnostic pin OC FLAGB , the power input pin V IN With the output pin V OUT, the power switch pin ON, the drain of the MOS tube Q1, the under-voltage protection module UVLO are connected, the under-voltage protection module UVLO is connected with the control logic module Control Logic, the gate of the MOS tube Q1 is connected with the output end of the low-offset comparator COMP, the power switch pin ON is connected with the control logic module Control Logic, the ground pin GND, the input end of the low-offset comparator COMP is connected with the current limit comparator CurrentLimit, the control logic module Control Logic, the charge pump Charge Pump, the control logic module Control Logic is connected with the over-heat protection module Thermal Shutdown, the current limit comparator CurrentLimit, the over-voltage protection module OVP, the gate of the MOS tube Q2, the current limit comparator CurrentLimit is connected with the source of the MOS tube Q1, the over-voltage protection module OVP, the output pin V OUT , the current setting pin I SET , the over-heat protection module Thermal Shutdown, the MOS tube Q2, the source of the MOS tube Q2 is connected with the ground pin GND, the drain of the MOS tube Q2 is connected with the diagnosis pin OC FLAGB .

[0005] Further, the chip body adopts SOP6 package.

[0006] Further, the size of the chip body is 1760 mu m * 1280 mu m.

[0007] Further, the chip body is built-in 24mΩ power switch, and the power switch pin ON is led out on the chip body.

[0008] The chip body is provided with the control logic module Control Logic, the over-voltage protection module OVP, the current limit comparator CurrentLimit, the under-voltage protection module UVLO, the low-offset comparator COMP, the charge pump Charge Pump, the over-heat protection module Thermal Shutdown, the MOS tube Q1 and Q2, so that over-voltage, under-voltage, over-heat and reverse current protection can be effectively provided, thereby meeting the use requirement of complex circuit and having good use value. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is the internal principle structure diagram of the chip body of the utility model. DETAILED DESCRIPTION

[0010] As Figure 1As shown, the utility model relates to a kind of multifunctional protection load switch chip, including chip main body, chip main body is provided with control logic module Control Logic, overvoltage protection module OVP, current limit comparator CurrentLimit, undervoltage protection module UVLO, low-offset comparator COMP, charge pump Charge Pump, thermal protection module ThermalShutdown, MOS tube Q1, Q2, chip main body is also provided with power input pin V IN , output pin V OUT , power switch pin ON, ground pin GND, current setting pin I SET , diagnostic pin OC FLAGB , power input pin V IN And output pin V OUT , power switch pin ON, the drain of MOS tube Q1, undervoltage protection module UVLO are all connected, undervoltage protection module UVLO is connected with control logic module Control Logic, the gate of MOS tube Q1 is connected with the output end of low-offset comparator COMP, power switch pin ON is connected with control logic module Control Logic, ground pin GND, the input end of low-offset comparator COMP is connected with current limit comparator Current Limit, control logic module Control Logic, charge pump Charge Pump, control logic module Control Logic is connected with thermal protection module ThermalShutdown, current limit comparator Current Limit, overvoltage protection module OVP, the gate of MOS tube Q2, current limit comparator CurrentLimit is connected with the source of MOS tube Q1, overvoltage protection module OVP, output pin V OUT , current setting pin I SET All are connected, the source of MOS tube Q2 is connected with ground pin GND, the drain of MOS tube Q2 is connected with diagnostic pin OC FLAGB ;Wherein, through diagnostic pin OC FLAGB , diagnostic pin OC FLAGB End can be driven from low level to high level when undervoltage lock, overvoltage lock or thermal shutdown tripping, to notify external device system condition abnormal.

[0011] Chip main body adopts SOP6 package;The size of chip main body is 1760 μm × 1280 μm;Chip main body is built-in 24mΩ ultra-low RDS (ON) power switch, and leads out power switch pin ON on chip main body.

[0012] In the implementation of overvoltage protection function, the overvoltage protection module OVP positive forward voltage is 5.8V, negative forward voltage is 5.5V; when the overvoltage protection module OVP positive forward voltage is 5.8V, the MOS tube Q1 is closed, and the output pin V OUT The output voltage is reduced; when the output pin V OUT The output voltage is reduced to the negative forward level 5.5V, the MOS tube Q1 is opened; in the implementation of overheat protection function, when the overheat protection module Thermal Shutdown detects that the temperature exceeds 150 DEG C, the MOS tube Q1 is closed, when it is detected that the temperature is cooled to 130 DEG C, the chip main body works again; in the implementation of under-voltage protection function, when the under-voltage protection module UVLO detects that the voltage of the power input pin V IN Is higher than 2.2V, the MOS tube Q1 is opened, and the voltage of the output pin V OUT Is raised to the voltage of the power input pin V IN When the voltage of the power input pin V IN Is lower than 2.2V, the output pin V OUT Outputs low level; in the implementation of reverse current protection, by setting the power switch pin ON to low level, the MOS tube Q1 is closed, and the output pin V OUT High level, the power input pin V IN No voltage is given, and the current drawn from the power input pin V IN Is less than 2uA.

[0013] The multifunctional protection load switch chip can provide overvoltage protection, under-voltage protection, overheat protection and reverse current protection in the area of 1760mu m*1280mu m, the built-in ultra-low RDS(ON) power switch helps to reduce power loss during normal operation, and can be widely applied to notebook computers, desktop computers, tablet devices, servers, memories (SSD / HDD), Thunderbolt / USB Type-C PD and other industry fields.

[0014] For those skilled in the art, it is obvious that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0015] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. A multifunctional protective load switch chip, comprising a chip body, characterized in that: The chip body is provided with a control logic module Control Logic, an overvoltage protection module OVP, a current limit comparator Current Limit, an undervoltage protection module UVLO, a low offset comparator COMP, a charge pump Charge Pump, an overheat protection module Thermal Shutdown, MOS tubes Q1 and Q2, and the chip body is also provided with a power input pin V IN , output pin V OUT , power switch pin ON, ground pin GND, current setting pin I SET , diagnostic pin OC FLAGB , the power input pin V IN With the output pin V OUT , the power switch pin ON, the drain of the MOS tube Q1, and the undervoltage protection module UVLO are all connected, the undervoltage protection module UVLO is connected to the control logic module Control Logic, the gate of the MOS tube Q1 is connected to the output end of the low offset comparator COMP, the power switch pin ON is connected to the control logic module Control Logic and the ground pin GND, the input end of the low offset comparator COMP is connected to the current limit comparator Current Limit, the control logic module Control Logic, and the charge pump Charge Pump, the control logic module Control Logic is connected to the overheating protection module Thermal Shutdown, the current limit comparator Current Limit, the overvoltage protection module OVP, and the gate of the MOS tube Q2, the current limit comparator Current Limit is connected to the source of the MOS tube Q1, the overvoltage protection module OVP, and the output pin V OUT , current setting pin I SET The source of the MOS tube Q2 is connected to the ground pin GND, and the drain of the MOS tube Q2 is connected to the diagnostic pin OC. FLAGB .

2. The multifunctional protective load switch chip according to claim 1, characterized in that: The chip body is packaged in SOP6.

3. The multifunctional protective load switch chip according to claim 1, characterized in that: The chip body has a size of 1760 μm×1280 μm.

4. The multifunctional protective load switch chip according to claim 1, characterized in that: The chip body has a built-in 24mΩ power switch, and the power switch pin ON is led out to the chip body.

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