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Protection circuit device using MOSFETs and a method of manufacturing the same

Inactive Publication Date: 2005-02-10
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017] The object of the present invention is to provide a protection circuit device using power MOSFET for realizing low ON-state resistance and reducing size of the device.

Problems solved by technology

However on the other hand, as switching element is connected to lithium ion battery in series, it is needed to make ON-state resistance of the switching element extremely small.
However making fine has limit, and there is a limit to decrease ON-state resistance extremely.
Although the protection circuit device is formed in a suitable shape to put in the case of the lithium ion battery, miniaturization is the largest problem for fundamental needs.

Method used

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  • Protection circuit device using MOSFETs and a method of manufacturing the same
  • Protection circuit device using MOSFETs and a method of manufacturing the same
  • Protection circuit device using MOSFETs and a method of manufacturing the same

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Embodiment Construction

[0045] The mode for carrying out the invention is described referring to FIG. 1 to FIG. 19.

[0046]FIG. 1 shows a plan view of a protection circuit device using the invention. Although circuit parts are mounted as the circuit shown in FIG. 19 is realized in the protection circuit device, the parts are not shown all in the figure. A conductive path 32 comprising copper foil is formed on both face of an insulating board 31, and has multilayer interconnection where the conductive paths 32 of upper face and lower face of the board are connected through through-hole (not shown) at desired position.

[0047] Characteristic of the invention is to mount a MOSFET chip 33 integrating power MOSFETs Q1 and Q2 of switching element in one chip with just bare chip by flip chip method.

[0048] A structure of concrete structure of the MOSFET chip 33 is shown in FIG. 33. FIG. 2A is a plan view, and FIG. 2B is a section view cut by X-X line.

[0049] The MOSFET chip 33 has an N+ / N semiconductor substrate 33...

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PUM

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Abstract

A protection circuit device using a MOSFET has a plural of conductive paths separated electrically, a MOSFET chip integrating two power MOSFETs in one chip where a gate electrode and a source electrode are fixed on the desired conductive path, conductive material provided on a common drain electrode of the MOSFET, and insulating resin covering said MOSFET, and supporting said conductive path in one body. Removing a drawing-around of the common drain electrode and fixing the source electrode directly on the conductive path, low ON-state resistance is realized.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates a protection circuit device using MOSFET and method of manufacturing the same, particularly enabling to build in a secondary battery and carrying out battery management. [0003] 2. Description of the Related Art [0004] As the spread of pocketable terminal, small lithium ion battery having large capacity is desired. A protection circuit device carrying out battery management of charge-discharge of the lithium ion battery must be smaller and sufficiently resist to short of load. As such protection circuit device is built in vessel of lithium ion battery, miniaturization is required, and freely using COB (Chip on Board) technique using many chip parts meets require of miniaturization. However on the other hand, as switching element is connected to lithium ion battery in series, it is needed to make ON-state resistance of the switching element extremely small. This is indispensable factor to...

Claims

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Application Information

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IPC IPC(8): H01L21/48H01L27/04H01L21/822H01L23/31H01L23/49H01L23/58H01L29/78
CPCH01L21/4832H01L2924/1306H01L24/45H01L24/49H01L24/97H01L2221/68377H01L2224/45144H01L2224/48091H01L2224/48247H01L2224/48465H01L2224/49111H01L2224/49171H01L2224/49175H01L2224/73265H01L2224/97H01L2924/01003H01L2924/01004H01L2924/01005H01L2924/01006H01L2924/01013H01L2924/01014H01L2924/01015H01L2924/01022H01L2924/01028H01L2924/01029H01L2924/01033H01L2924/01039H01L2924/01046H01L2924/01047H01L2924/0105H01L2924/01059H01L2924/01075H01L2924/01078H01L2924/01079H01L2924/01082H01L2924/09701H01L2924/13091H01L2924/14H01L2924/19041H01L2924/19043H01L2924/30105H01L23/3107H01L2224/32245H01L2924/014H01L2924/01024H01L24/48H01L2924/00014H01L2924/00H01L2924/00012H01L2924/15787H01L2924/181H01L2924/12042H01L2224/0603H01L29/78
Inventor SAKAMOTO, NORIAKIKOBAYASHI, YOSHIYUKIFUKUDA, HIROKAZUETOU, HIROKITAKAHASHI, KOUJI
Owner SANYO ELECTRIC CO LTD
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