**Exhibit 31.2****CERTIFICATION**     I, Greg Hildebrand, certify that: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 oromit to state a material factnecessary to make the statements made, in light of the circumstances under which suchstatements were made, not misleading withrespect to the period covered by this report; 3. Based on my knowledge, the financial statements, and other financial information included inthis report, fairly present in allmaterial respects the financial condition, results of operations and cash flows of theregistrant as of, and for, the periods presented inthis report; 4. The registrant’s other certifying officer(s) and I are responsible for establishing andmaintaining disclosure controls and procedures(as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financialreporting (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 disclosurecontrols and procedures to be designed under our supervision, to ensure that materialinformation relating to the registrant, including its consolidated subsidiaries, is madeknown to us by others within those entities, particularly during the period in whichthis report is being prepared;  b) Designed such internal control over financial reporting, or caused such internalcontrol over financial reporting to be designed under our supervision, to providereasonable assurance regarding the reliability of financial reporting and thepreparation of financial statements for external purposes in accordance with generallyaccepted accounting principles;  c) Evaluated the effectiveness of the registrant’s disclosure controls andprocedures and presented in this report our conclusions about the effectiveness of thedisclosure controls and procedures, as of the end of the period covered by this reportbased on such evaluation; and  d) Disclosed in this report any change in the registrant’s internal control overfinancial 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 hasmaterially affected, or is reasonably likely to materially affect, the registrant’sinternal control over financial reporting; and5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recentevaluation of internal control overfinancial reporting, to the registrant’s auditors and the audit committee of the registrant’sboard of directors (or persons performingthe equivalent functions): a) All significant deficiencies and material weaknesses in the design or operationof internal control over financial reporting which are reasonably likely to adverselyaffect the registrant’s ability to record, process, summarize and report financialinformation; and  b) Any fraud, whether or not material, that involves management or other employeeswho have a significant role in the registrant’s internal control over financialreporting.     Date: May 10, 2006 By: /s/ Greg Hildebrand         Greg Hildebrand    Chief Financial Officer