April 15 (Reuters) - Nvidia (NVDA.O) on Tuesday said it would take $5.5 billion in charges after the U.S. government limited exports of its H20 artificial intelligence chip to China, a key market for one of its most popular chips.

Nvidia’s AI chips have been a key focus of U.S. export controls as U.S. officials have moved to keep the most advanced chips from being sold to China as the U.S. tries to keep ahead in the AI race. After those controls were implemented, Nvidia began designing chips that would come as close as possible to U.S. limits.