Maxim's MAX13330 and 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 (-1.5 V/V) on the MAX13330, or adjusted externally with resistors on the MAX13331.
The MAX13330 and MAX13331 deliver 120 mW per channel into a 16 Ω load or 135 mW into a 32 Ω 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 8 Ω, enabling the use of small loudspeakers. An 80 dB at 217 Hz PSRR allows these devices to operate from noisy digital supplies without an additional linear regulator. These devices include ±15 kV human body model ESD protection and short-circuit protection up to 45 V 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 3 µA (typ). The devices are specified from -40°C to a 105°C AEC-Q100 level 2 automotive temperature range, and are available in a 16-pin QSOP package.
- 4 V to 5.5 V Single-supply operation
- 2 MHz charge pump prevents AM radio interference
- Ground-referenced outputs eliminate bulky DC-blocking capacitors
- Short-to-ground and battery output (VBAT to 45 V), load dump protection
- Short-circuit diagnostic output
- Adjustable gain (MAX13331) or fixed - 1.5 V/V gain (MAX13330)
- 125 mW per Channel into 32 Ω at 0.01% THD+N
- Integrated click-and-pop suppression
- High PSRR eliminates LDO
- No degradation of low-frequency response due to output capacitors
- ±15 kV human body model ESD protection for output pins
- Automotive entertainment systems
- Automotive rear seat entertainment systems