Overview
The LA4585M is a preamplifier plus power amplifier IC that supports auto-reverse and was developed for use in  3-V headphone stereo products.

eatures
• The LA4585M is designed for use in playback-only compact cassette players. In addition to preamplifier and power amplifier functions, the LA4585M also provides low boost and automatic power output limiter (PVSS:Peak Volume Select System) functions.
• Provided in a mini-flat 36-pin quad package (0.65 mm lead pitch) optimal for miniature end products.
• Two auto-reverse playback preamplifiers
• Two headphone power amplifiers (16 Ω)
• Low boost function (auto-loudness effect)
• Output limiter function (PVSS)
• Two radio input switches (pre-muting switches)
• Power muting switch