1 Features
1• Mono BTL Digital Power Amplifier
• 22-W Output Power at 10% THD+N into 4 Ω
• 4.5-V to 18-V Operating Range
• 85% Efficiency into 4 Ω
• Differential Analog Input
• Speaker Guard™ Speaker Protection with
Adjustable Power Limiter
• 75-dB Power-Supply Rejection Ratio (PSRR)
• Load Diagnostic Functions:
– Open and Shorted Output Load
– Output-to-Power and Output-to-Ground Shorts
• Protection and Monitoring Functions:
– Short-Circuit Protection
– 40-V Load Dump Protection per ISO-7637-2
– Output DC Level Detection while Music is
Playing
– Overtemperature Protection
– Overvoltage and Undervoltage Protection
• Thermally Enhanced 16-Pin HTSSOP (PWP)
Package with PowerPAD™ Package (Pad Down)
• Designed for Automotive EMC Requirements
• Qualified According to AEC-Q100 Grade 2
• ISO9000: 2002 TS16949 Certified
• –40°C to 125°C Ambient Temperature Range

2 Applications
• Automotive Emergency Call (eCall) Amplifier
• Telematics Systems
• Instrument Cluster Systems
• Infotainment Audio

3 Description
The TAS5421-Q1 is a mono digital audio amplifier,
ideal for use in automotive emergency call (eCall),
telematics, instrument cluster, and infotainment
applications. The device provides up to 22 W into 4 Ω
at less than 10% THD+N from a 14.4-Vdc automotive
battery. The wide operating voltage range and
excellent efficiency make the device ideal for startstop
support or running from a backup battery when
required. The integrated load-dump protection
reduces external voltage clamp cost and size, and
the onboard load diagnostics report the status of the
speaker through I2C.