Exhibit 31.2
 CERTIFICATION
  1.
    
    I have reviewed this quarterly report on Form 10-Q of Volterra Semiconductor Corporation;2.
    
    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material
fact necessary to make the statements made, in light of the circumstances under which such statements were made, not
misleading with respect to the period covered by this report;3.
    
    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in
all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the
periods presented in this report;4.
    
    The registrants other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and
procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as
defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:
 a)
    
    Designed such disclosure controls and procedures, or caused such disclosure
controls and procedures to be designed under our supervision, to ensure
that material information relating to the registrant, including its
consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this report is being
prepared;b)
    
    Designed such internal control over financial reporting, or caused such
internal control over financial reporting to be designed under our
supervision, to provide reasonable assurance regarding the reliability of
financial reporting and the preparation of financial statements for
external purposes in accordance with generally accepted accounting
principles;c)
    
    Evaluated the effectiveness of the registrants disclosure controls and
procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of
the period covered by this report based on such evaluation; andd)
    
    Disclosed in this report any change in the registrants internal control
over financial reporting that occurred during the registrants most recent
fiscal quarter (the registrants fourth fiscal quarter in the case of an
annual report) that has materially affected, or is reasonably likely to
materially affect, the registrants internal control over financial
reporting; and
 5.
    
    The registrants other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control
over financial reporting, to the registrants auditors and the audit committee of the registrants board of directors (or
persons performing the equivalent functions):
 a)
    
    All significant deficiencies and material weaknesses in the design or
operation of internal control over financial reporting which are reasonably
likely to adversely affect the registrants ability to record, process,
summarize and report financial information; andb)
    
    Any fraud, whether or not material, that involves management or other
employees who have a significant role in the registrants internal control
over financial reporting.
 Date: October 30, 2008
    By:
    /s/ Mike BurnsMike BurnsChief Financial Officer