ESD with reverse connection preventing protection integrated circuit

An integrated circuit and anti-reverse connection technology, which is applied in the direction of emergency protection circuit devices, current collectors, circuit devices, etc., can solve problems that are difficult to implement and do not consider battery reverse connection protection, so as to reduce the probability of damage, guarantee reliability, cost reduction effect

Inactive Publication Date: 2016-02-03
CHONGQING ZEQINGJU SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Input and output backfeed protection is well implemented, but battery reverse connection protection is difficult to achieve due to the existence of ESD diodes
Therefore, the charging management ICs currently on the market do not consider battery reverse polarity protection.

Method used

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  • ESD with reverse connection preventing protection integrated circuit
  • ESD with reverse connection preventing protection integrated circuit

Examples

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Embodiment Construction

[0008] The present invention will be further described below in conjunction with specific examples.

[0009] like figure 1 , figure 2 As shown, an ESD with an anti-reverse connection protection integrated circuit includes a comparator 2, a diode D2, a resistor R3 and an internal input and output anti-backfeed circuit.

[0010] When the battery is reversely connected between BAT and GND, the negative pressure detection is performed by comparator 2 to detect the polarity of the battery. A comparator controls the gate of the power PMOS, closing the charging loop. At the same time, since the ESD diode is counted into the VBAT port through the switch of the anti-backfeed circuit, the equivalent circuit when the battery is reversed: a back-to-back parasitic body diode is connected in series, and the leakage of the ESD diode is completely resisted. The performance of the circuit in ESD protection is not affected. When VBAT is high-voltage to GND, the voltage drop of the parasitic...

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PUM

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Abstract

The invention discloses an ESD with a reverse connection preventing protection integrated circuit. The ESD comprises a comparator 2, a diode D2, a resistor R3 and a built-in portion of an input and output reverse irrigation preventing circuit. The ESD with the reverse connection preventing protection integrated circuit achieves battery reverse connection preventing protection and ESD protection, and provides reliable guarantee for a chip at the same time.

Description

technical field [0001] The invention relates to an integrated circuit, in particular to an ESD with an anti-reverse connection protection integrated circuit. Background technique [0002] In charge management integrated circuits, since there is a lithium battery at the output end, application engineers require such chips to implement two protections: battery reverse connection protection and input and output anti-backfeed protection. Battery anti-reverse connection protection requires that when the positive and negative poles of the battery are reversely connected to the output terminal of the chip, the chip port will not be burned out, and the battery will not be drained of a large amount of charge. The input and output anti-backfeed protection is to remove the input port after the battery is connected to the port of the charging management chip to ensure that the current will not flow into the input port of the chip. Input and output backfeed protection is easy to impleme...

Claims

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Application Information

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IPC IPC(8): H02J7/00H02H7/18
Inventor常小燕
OwnerCHONGQING ZEQINGJU SCI & TECH DEV