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MAX13331：Automotive DirectDrive® Headphone Amplifiers with Output Protection and Diagnostics

Industry's First Automotive Headphone Amplifiers with Output Protection Up to 45V and Short-Circuit Diagnostics

The MAX13330/MAX13331 stereo headphone amplifiers are designed for automotive applications requiring output short-circuit and ESD protection to battery/ground with diagnostics. These devices use Maxim's unique DirectDrive® architecture to produce a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving board space and component height. The gain of the amplifier is set internally (-1.5V/V) on the MAX13330 or adjusted externally with resistors on the MAX13331. The MAX13330/MAX13331 deliver 120mW per channel into a 16Ω load or 135mW into a 32Ω load and have a low 0.01% THD+N. Low output impedance and the efficient integrated charge pump allows the device to drive loads as low as 8Ω, enabling the use of small loudspeakers. An 80dB at 217Hz PSRR allows these devices to operate from noisy digital supplies without an additional linear regulator. These devices include ±15kV Human Body Model ESD protection and short-circuit protection up to +45V at the headphone outputs. Comprehensive click-and-pop circuitry suppresses audible clicks and pops on startup and shutdown. A low-power shutdown mode reduces the supply current to 3µA (typ). The MAX13330/MAX13331 are specified from -40°C to +105°C AEC-Q100 Level 2 automotive temperature range and are available in a 16-pin QSOP package.

Key Features 4V to 5.5V Single-Supply Operation 2MHz Charge Pump Prevents AM Radio Interference Ground-Referenced Outputs Eliminate Bulky DC-Blocking Capacitors Short-to-Ground and Battery (VBAT up to +45V) Output Protection, Load Dump Protection Short-Circuit Diagnostic Output Adjustable Gain (MAX13331) or Fixed -1.5V/V Gain (MAX13330) 125mW per Channel into 32Ω at 0.01% THD+N Integrated Click-and-Pop Suppression High PSRR Eliminates LDO No Degradation of Low-Frequency Response Due to Output Capacitors ±15kV Human Body Model ESD Protection for Output Pins

MAX13330, MAX13331: Simplified Block Diagram Applications/Uses Automotive Entertainment Systems Automotive Rear Seat Entertainment Systems

DataSheet

Parametrics

Design kits & evaluation modules

• MAX13331EVKIT

Quality and Environmental Data

• MAX13331.pdf

Ordering Information