Document
19-0509; Rev 0; 4/06
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Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux
General Description
The MAX9777/MAX9778 combine a stereo 3W bridgetied load (BTL) audio power amplifier, stereo singleended (SE) headphone amplifier, headphone sensing, and a 2:1 input multiplexer all in a tiny 28-pin thin QFN package. These devices operate from a single 4.5V to 5.5V supply and feature an industry-leading 100dB PSRR, allowing these devices to operate from noisy supplies without the addition of a linear regulator. An ultra-low 0.002% THD+N ensures clean, low-distortion amplification of the audio signal. Patented click-andpop suppression minimizes audible transients on power and shutdown cycles. Power-saving features include low 4mV VOS (minimizes DC current drain through the speakers), low 13mA supply current, and a 10µA shutdown mode. A MUTE function allows the outputs to be quickly enabled or disabled. A headphone sense input detects the presence of a headphone jack and automatically configures the amplifiers for either speaker or headphone mode. In speaker mode, the amplifiers can deliver up to 3W of continuous average power into a 3Ω load. In headphone mode, the amplifier can deliver up to 200mW of continuous average power into a 16Ω load. The gain of the amplifiers is externally set, allowing maximum flexibility in optimizing output levels for a given load. The amplifiers also feature a 2:1 input multiplexer, allowing multiple audio sources to be selected. The multiplexer can also be used to compensate for limitations in the frequency response of the loud speakers by selecting an external equalizer network. The various functions are controlled by either an I2C†-compatible (MAX9777) or simple parallel control interface (MAX9778). The MAX9777/MAX9778 are available in a thermally efficient 28-pin thin QFN package (5mm x 5mm x 0.8mm). These devices have thermal-overload protection (OVP) and are specified over the extended -40°C to +85°C temperature range. o o o o o o o o o o o o o
Features
Industry-Leading, Ultra-High 100dB PSRR PC99/01 Compliant 3W BTL Stereo Speaker Amplifier 200mW Stereo Headphone Amplifier Low 0.002% THD+N Patented Click-and-Pop Suppression ESD-Protected Outputs Low Quiescent Current: 13mA Low-Power Shutdown Mode: 10µA MUTE Function Headphone Sense Input Stereo 2:1 Input Multiplexer Optional 2-Wire, I2C-Compatible or Parallel Interface o Tiny 28-Pin Thin QFN (5mm x 5mm x 0.8mm) Package
MAX9777/MAX9778
Ordering Information
PART MAX9777ETI+ MAX9778ETI+ CONTROL INTERFACE I2C Compatible Parallel PINPACKAGE PKG CODE
28 Thin QFN-EP* T2855-6 28 Thin QFN-EP* T2855-6
Note: All devices are specified over the -40°C to +85°C operating temperature range. +Denotes lead-free package. *EP = Exposed paddle. Pin Configurations and Functional Diagrams appear at end of data sheet.
Simplified Block Diagram
SINGLE SUPPLY 4.5V TO 5.5V
LEFT IN1
Applications
Notebooks Portable DVD Players Tablet PCs PC Audio Peripherals Camcorders Multimedia Monitor
LEFT IN2 SE/ BTL RIGHT IN1 RIGHT IN2
†Purchase of I2C components from Maxim Integrated Products,
CONTROL
I2CCOMPATIBLE
Inc., or one of its sublicensed Associate Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification defined by Philips.
MAX9777
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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Stereo 3W Audio Power Amplifiers with Headphone Drive and Input Mux MAX9777/MAX9778
ABSOLUTE MAXIMUM RATINGS
VDD to GND ...........................................................................+6V PVDD to VDD .......................................................................±0.3V PGND to GND.....................................................................±0.3V All Other Pins to GND.................................-0.3V to (VDD + 0.3V) Continuous Input Current (into any pin except power-supply and output pins) ...............................................................±20mA OUT__ Short Circuit to GND, VDD ..........................................10s Short Circuit Between OUT_+ and OUT_- .................Continuous Continuous Power Dissipation (TA = +70°C) 28-Pin TQFN, Multilayer Board (derate 34.5mW/°C above +70°C) ..........................2758.6mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Junction Temperature ......................................................+150°C Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional ope.