Exhibit 3(i)

RESTATED CERTIFICATE OF INCORPORATION OF

INPHI CORPORATION

Inphi Corporation, a corporation organized and existing under the laws of the State of Delaware, hereby certifies as
follows:

FIRST: The name of the corporation is Inphi Corporation.

SECOND: The original Certificate of Incorporation of the corporation was filed with the Secretary of State of the State of Delaware on
November 13, 2000 and the original name of the corporation was TCom Communications, Inc., and a Restated Certificate of Incorporation was filed on December 4, 2000. A Certificate of Amendment of the Restated Certificate of Incorporation,
whereby the corporation changed its name, was filed with the Secretary of State on February 27, 2001.

THIRD: Pursuant to
Sections 242 and 245 of the General Corporation Law of the State of Delaware, this Restated Certificate of Incorporation restates, integrates and further amends the provisions of the Certificate of Incorporation of the corporation.

FOURTH: The Certificate of Incorporation of the corporation shall be amended and restated to read in full as follows:

ARTICLE I

The name of the Corporation is Inphi Corporation (the Corporation).

ARTICLE II

The address of the registered office of the corporation in the State of Delaware is 2711 Centerville Road, Suite 400, in the City of Wilmington, County of New Castle. The name of its registered agent at
such address is Corporation Service Company.

ARTICLE III

The purpose of the Corporation is to engage in any lawful act or activity for which a corporation may be organized under the Delaware
General Corporation Law (the DGCL).

ARTICLE IV

A. Classes of Stock. The total number of shares of all classes of capital stock that the Corporation shall have authority to issue
is 510,000,000, of which 500,000,000 shares shall be Common Stock, $0.001 par value per share (the Common Stock), and of which 10,000,000 shares shall be Preferred Stock, $0.001 par value per share (the
Preferred Stock). The number of authorized shares of Common Stock or Preferred Stock may be increased or decreased (but not below the number of shares thereof then outstanding) by the affirmative vote of the holders of a
majority of the then outstanding shares of Common Stock, without a vote of



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the holders of the Preferred Stock, or of any series thereof, unless a vote of any such Preferred Stock holders is required pursuant to the provisions established by the Board of Directors of the
Corporation (the Board of Directors) in the resolution or resolutions providing for the issue of such Preferred Stock, and if such holders of such Preferred Stock are so entitled to vote thereon, then, except as may
otherwise be set forth in the certificate of incorporation of the corporation, the only stockholder approval required shall be the affirmative vote of a majority of the voting power of the Common Stock and the Preferred Stock so entitled to vote,
voting together as a single class.

B. Preferred Stock. The Preferred Stock may be issued from time to time in one or
more series, as determined by the Board of Directors. The Board of Directors is expressly authorized to provide for the issue, in one or more series, of all or any of the remaining shares of Preferred Stock and, in the resolution or resolutions
providing for such issue, to establish for each such series the number of its shares, the voting powers, full or limited, of the shares of such series, or that such shares shall have no voting powers, and the designations, preferences and relative,
participating, optional or other special rights of the shares of such series, and the qualifications, limitations or restrictions thereof. The Board of Directors is also expressly authorized (unless forbidden in the resolution or resolutions
providing for such issue) to increase or decrease (but not below the number of shares of such series then outstanding) the number of shares of any series subsequent to the issuance of shares of that series. In case the number of shares of any such
series shall be so decreased, the shares constituting such decrease shall resume the status that they had prior to the adoption of the resolution originally fixing the number of shares of such series.

C. Common Stock.

1. Relative Rights of Preferred Stock and Common Stock. All preferences, voting powers, relative, participating, optional or other special rights and privileges, and qualifications, limitations, or
restrictions of the Common Stock are expressly made subject and subordinate to those that may be fixed with respect to any shares of the Preferred Stock.

2. Voting Rights. Except as otherwise required by law or the certificate of incorporation of the Corporation, each holder of Common Stock shall have one vote in respect of each share of stock held
by such holder of record on the books of the Corporation for the election of directors and on all matters submitted to a vote of stockholders of the Corporation.

3. Dividends. Subject to the preferential rights of the Preferred Stock, the holders of shares of Common Stock shall be entitled to receive, when and if declared by the Board of Directors, out of
the assets of the Corporation which are by law available therefor, dividends payable either in cash, in property or in shares of capital stock.

4. Dissolution, Liquidation or Winding Up. In the event of any dissolution, liquidation or winding up of the affairs of the Corporation, after distribution in full of the preferential amounts, if
any, to be distributed to the holders of shares of the Preferred Stock, holders of Common Stock shall be entitled, unless otherwise provided by law or the certificate of incorporation of the Corporation, to receive all of the remaining assets of the
Corporation of



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whatever kind available for distribution to stockholders ratably in proportion to the number of shares of Common Stock held by them respectively.

ARTICLE V

In furtherance and not in limitation of the powers conferred by the laws of the State of Delaware:

A. The Board of Directors is expressly authorized to adopt, amend or repeal the bylaws of the Corporation, without any action on the part
of the stockholders, by the vote of at least a majority of the directors of the Corporation then in office. In addition to any vote of the holders of any class or series of stock of the Corporation required by law or the certificate of incorporation
of the Corporation, the bylaws may also be adopted, amended or repealed by the affirmative vote of the holders of at least sixty-six and two-thirds percent (66-2/3%) of the voting power of the shares of the capital stock of the Corporation entitled
to vote in the election of directors, voting as one class; provided, however, that the affirmative vote of the holders representing only a majority of the voting power of the shares of the capital stock of the Corporation entitled to vote in the
election of directors, voting as one class, shall be required if such adoption, amendment or repeal of the bylaws has been previously approved by the affirmative vote of at least two-thirds (2/3) of the directors of the Corporation then in
office.

B. Elections of directors need not be by written ballot unless the bylaws of the Corporation shall so provide.

C. The books of the Corporation may be kept at such place within or without the State of Delaware as the bylaws of the
Corporation may provide or as may be designated from time to time by the Board of Directors.

ARTICLE VI

A. The business and affairs of the Corporation shall be managed by a Board of Directors. Other than those directors elected by the
holders of any series of Preferred Stock as provided for or fixed pursuant to the provisions of Article IV hereof, each director shall serve until his successor shall be duly elected and qualified or until his earlier resignation, removal from
office, death or incapacity.

B. Subject to the rights of the holders of any series of Preferred Stock then outstanding, newly
created directorships resulting from any increase in the authorized number of directors or any vacancies in the Board of Directors resulting from death, resignation, retirement, disqualification, removal from office or other cause shall be filled
solely by a majority vote of the directors then in office, although less than a quorum, or by a sole remaining director. If there are no directors in office, then an election of directors may be held in the manner provided by statute. Directors
chosen pursuant to any of the foregoing provisions shall hold office until their successors are duly elected and have qualified or until their earlier resignation or removal. No decrease in the number of directors constituting the Board of Directors
shall shorten the term of any incumbent director. In the event of a vacancy in the Board of Directors, the remaining directors, except as otherwise provided by law, or by the certificate of incorporation or the bylaws of the corporation, may
exercise the powers of the full board until the vacancy is filled.



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ARTICLE VII

A. No action required or permitted to be taken at any annual or special meeting of the stockholders may be taken without a meeting and the power of stockholders to consent in writing, without a meeting,
to the taking of any action is specifically denied.

B. Special meetings of the stockholders of the Corporation may be called
only by the Chairman of the Board or the Chief Executive Officer of the Corporation or by a resolution adopted by the affirmative vote of a majority of the Board of Directors, and any power of stockholders to call a special meeting of stockholders
is specifically denied.

C. Advance notice of stockholder nominations for the election of directors and of business to be
brought by stockholders before any meeting of the stockholders of the Corporation shall be given in the manner and to the extent provided in the bylaws of the Corporation.

D. Unless the Corporation consents in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware shall be the sole and exclusive forum for (i) any derivative
action or proceeding brought on behalf of the Corporation, (ii) any action asserting a claim of breach of a fiduciary duty owed by any director, officer or other employee of the Corporation to the Corporation or the Corporations
stockholders, (iii) any action asserting a claim arising pursuant to any provision of the DGCL, or (iv) any action asserting a claim governed by the internal affairs doctrine. Any person or entity purchasing or otherwise acquiring any
interest in shares of capital stock of the Corporation shall be deemed to have notice of and consented to the provisions of this Article VII, Paragraph D.

ARTICLE VIII

A. Limitation on Liability. To the fullest extent
permitted by the DGCL, as the same exists or as may hereafter be amended (including, but not limited to Section 102(b)(7) of the DGCL), a director of the Corporation shall not be personally liable to the Corporation or its stockholders for
monetary damages for breach of fiduciary duty as a director. If the DGCL hereafter is amended to further eliminate or limit the liability of directors, then the liability of a director of the Corporation, in addition to the limitation on personal
liability provided herein, shall be limited to the fullest extent permitted by the amended DGCL. Any repeal or modification of this paragraph by the stockholders of the Corporation shall be prospective only, and shall not adversely affect any
limitation on the personal liability of a director of the Corporation existing at the time of such repeal or modification.

B.
Indemnification. Each person who is or was a director or officer of the Corporation or is or was serving at the request of the Corporation as a director, officer, employee or agent of another corporation or of a partnership, joint venture,
trust, employee benefit plan or other enterprise (including the heirs, executors, administrators or estate of such person), shall be indemnified and advanced expenses by the Corporation, in accordance with the bylaws of the Corporation, to the
fullest extent authorized by the DGCL, as the same exists or may hereafter be amended (but, in the case of any such amendment, only to the extent that such amendment permits the Corporation to provide broader indemnification rights than said law
permitted the



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Corporation to provide prior to such amendment) or any other applicable laws as presently or hereinafter in effect. The right to indemnification and advancement of expenses hereunder shall not be
exclusive of any other right that any person may have or hereafter acquire under any statute, provision of the certificate of incorporation or bylaws of the Corporation, agreement, vote of stockholders or disinterested directors or otherwise.

C. Insurance. The Corporation may, to the fullest extent permitted by law, purchase and maintain insurance on behalf
of any person who is or was a director, officer, employee or agent of the Corporation or another corporation, partnership, joint venture, trust, employee benefit plan or other enterprise against any expense, liability or loss incurred by such person
in any such capacity or arising out of such persons status as such, whether or not the Corporation would have the power to indemnify such person against such expense, liability or loss under the DGCL.

D. Repeal and Modification. Any repeal or modification of the foregoing provisions of this Article VIII shall not adversely affect
any right or protection existing hereunder immediately prior to such repeal or modification.

ARTICLE IX

The affirmative vote of the holders of at least sixty-six and two-thirds percent (66-2/3%) of the voting power of the shares of the
capital stock of the Corporation entitled to vote generally in the election of directors, voting together as a single class, shall be required to amend in any respect or repeal this Article IX, Paragraph A of Article V, Articles VI, VII and VIII.

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FIFTH: This Restated Certificate of Incorporation was duly adopted by the Board of Directors of the corporation.

SIXTH: This Restated Certificate of Incorporation was duly adopted by the stockholders in accordance with the provisions of Sections 242 and 245 of the General Corporation Law of the State of Delaware.
Written consent of the stockholders has been given with respect to this Restated Certificate of Incorporation in accordance with Section 228 of the General Corporation Law of the State of Delaware, and written notice has been given as provided
in Section 228.

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IN WITNESS WHEREOF, the corporation has caused this certificate to be
signed by its Chief Executive Officer and attested by its Secretary this 16thday of November, 2010.



|        |  |                         |  |  |  |                   |  |                                                     
|------- |  | ----------------------- |  |  |  | ----------------- |  | ----------------------------------------------------
|        |  |                         |  |  |  | INPHI CORPORATION
|        |  |                         |  | 
|        |  |                         |  |  |  | By                |  | /s/ Young K. Sohn                                   
|        |  |                         |  |  |  |                   |  | Young K. Sohn, Chief Executive Officer and President
|Attest: |  |                         |  |  |  |                  
|        |  |                         |  | 
|By      |  | /s/ John Edmunds        |  |  |  |                   |  |                                                     
|        |  | John Edmunds, Secretary |  |  |  |                   |  |                                                     



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