UPDATE 1-Japan's Hitachi to raise up to $4.5 bln -sources

* To raise up to Y300 bln in public share offering -sources

* Would mean dilution of 30 pct at current stock price

* To issue Y100 bln worth convertible bonds -sources

* Company announcement as early as Monday -sources

(Updates with details, background)

By Reiji Murai and Kentaro Hamada

TOKYO, Nov 15 (Reuters) - Hitachi Ltd (6501.T), Japan's biggest electronics firm by revenues, plans to raise up to 400 billion yen ($4.5 billion) by issuing new shares and convertible bonds to shore up its battered capital base, two sources familiar with the matter said.

The sources, who asked not to be identified ahead of an official announcement anticipated as early as Monday, said Hitachi plans to sell about 300 billion yen worth of shares and another 100 billion yen in convertible bonds.