UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Date of report (Date of earliest event reported): March 27, 2020

SILICON LABORATORIES INC.

(Exact Name of Registrant as Specified in Charter)

Registrant’s telephone number, including area code: (512) 416-8500

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.

Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Securities Exchange Act of 1934. ¨

Item 2.03. Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

As previously disclosed, on August 7, 2019, Silicon Laboratories Inc. and certain of its domestic subsidiaries (collectively, the “Company”) entered into the Third Amendment to Credit Agreement (the “Amended Credit Agreement”) with Wells Fargo Bank, National Association (“Wells Fargo”), as administrative agent, and a syndicate of lenders. The Amended Credit Agreement consists of a $400 million revolving credit facility with a maturity date of August 7, 2024. The material terms of the Amended Credit Facility are described under “Note 10 - Debt” of the Notes to Consolidated Financial Statements for the Company which is included in our Annual Report on Form 10-K for the fiscal year ended December 28, 2019, filed with the Securities and Exchange Commission on January 29, 2020, and which description is incorporated herein by reference.

On March 27, 2020, the Company provided notice to Wells Fargo to borrow $310 million under the Amended Credit Agreement. The Company increased its borrowings as a precautionary measure in order to increase its cash position and preserve financial flexibility in light of current uncertainty in the global markets resulting from the novel coronavirus outbreak. The proceeds borrowed will be available to be used for general corporate purposes as permitted by the Amended Credit Agreement and/or to finance all or a portion of the purchase price payable in connection with the Asset Purchase Agreement entered into with Redpine Signals, Inc. on March 11, 2020.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.