Maddux Madsen threw for four touchdowns in the first half of No. 15 Boise State’s 56-24 romp past visiting San Diego State in a Friday night Mountain West Conference matchup.

Latrell Caples caught six passes for 90 yards and three touchdown for the Broncos, and Ashton Jeanty ran for 149 yards and two touchdowns on 31 carries to keep his Heisman Trophy candidacy rolling.

Madsen connected on 24 of 32 passes for 307 yards.

Boise State (7-1, 4-0 Mountain West) produced 541 yards of total offense and also scored a touchdown on defense en route to its sixth win in a row.

The Aztecs (3-5, 2-1) managed only 12 first downs and 256 yards of total offense, as Marquez Cooper gained 94 yards on 16 carries.

San Diego State quarterback Danny O’Neil threw for two touchdowns, but he was intercepted twice and was 14-for-30 for 155 yards.

The Aztecs, whose previous four games were all decided by three points or fewer, couldn’t keep it close after the Broncos built a 21-0 first-quarter lead. As a result, what was billed as a bit of a conference showdown didn’t materialize.

Madsen threw for 18 yards and 19 yards to Caples for scores in the first quarter. A’Marion McCoy’s 35-yard interception return gave Boise State a second touchdown in an eight-second span and a 21-0 lead late in the opening period.

It was 28-0 after Madsen threw to Prince Strachan for a 14-yard scoring play with 11:35 to play in the second quarter. The third Madsen-to-Caples TD connection came with 22 seconds left in the half, which ended with the Broncos up 35-10.

Jeanty did his scoring in the second half. He had the only touchdown in the third quarter, a 4-yard run, and he opened the fourth-quarter scoring with another 4-yard run.

O’Neil had his two touchdown throws in the fourth quarter, tossing 30 yards to Jordan Napier and 30 yards to Mekhi Shaw.