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

Please check latest availability status for a specific part variant.


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.
MAX13330, MAX13331: Simplified Block Diagram MAX13330, MAX13331: Simplified Block Diagram Enlarge+

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


  • Automotive Entertainment Systems
  • Automotive Rear Seat Entertainment Systems
Part NumberHdph. Amp. VCC
Hdph. Amp. VCC
Hdph. Amp. ICC
Hdph. Amp. POUT into 32Ω
Hdph. Amp. Half Pwr. THD+N
Hdph. Amp. Ext. GainHdph. Amp. Fxd. Gain
Hdph. Amp. Fxd. Gain
minmaxtyp@ 1% THD+NA- WeightedminminmaxSee Notes
MAX13330 45.5101350.01410086No1.51.5
$1.56 @1k
MAX13331 Yes--
$0.83 @1k
See All Headphone Amplifiers (8)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX13331EVKIT: Evaluation Kit for the MAX13330 and MAX13331

Technical Documents

App Note 4607 Add a Discrete Jack-Sensing Circuit to the MAX13330/MAX13331 Automotive Headphone Amplifier

Quality and Environmental Data

Product Reliability Reports: MAX13330.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX13330GEE/V+
  • MAX13330GEE/V+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >


    Related Resources

    PDF Title