MAX4297

+2.7V to +5.5V Single-Supply Operation
2W/Channel Output Power at 5V, 0.7W/Channel Output Power at 3V
87% Efficiency (RL = 4, PO = 2W, MAX4295)
0.4% THD+N (RL = 4, fOSC = 125kHz)
Logic-Programmable PWM Frequency Selection (125kHz, 250kHz, 500kHz, 1MHz)
Low-Power Shutdown Mode
Clickless Transitions Into and Out of Shutdown
1A Current Limit and Thermal Protection
Available in Space-Saving Packages 16-Pin QSOP (MAX4295) 24-Pin SSOP (MAX4297)

Palmtop/Notebook                                                                        Boom Boxes
Computers                                                                                   AC Amplifiers
PDA Audio                                                               Battery-Powered Speakers
Sound Cards                                                                           Cordless Phones
Game Cards                                                                        Portable Equipment

VCC, PVCC to GND or PGND....................................................................-0.3V to +6V
PGND to GND....................................................................................................±0.3V
PVCC to VCC ....................................................................................................±0.3V
VCM, SS, AOUT_, IN_ ................................................................-0.3V to (VCC + 0.3V)
SHDN, FS1, FS2 ......................................................................................-0.3V to +6V
OUT_ _ ...................................................................................-0.3V to (PVCC + 0.3V)
Op Amp Output Short-Circuit
Duration (AOUT_) ..........................................Indefinite Short Circuit to Either Supply
H-Bridge Short-Circuit
Duration (OUT_ _) .................................................Continuous Short Circuit to PGND,
PVCC or between OUT+_ & OUT-_
Continuous Power Dissipation (TA = +70°C)
16-Pin QSOP (derate 8.30mW/°C above +70°C).........................................667mW
24-Pin SSOP (derate 9.50mW/°C above +70°C) .........................................762mW
16-Pin Narrow SO
(derate 9.52mW/°C above +70°C)..............................................................696mW
24-Pin Wide SO
(derate 11.76mW/°C above +70°C).............................................................941mW
Operating Temperature Range
MAX4295E__/MAX4297E__ ..............................................................-40°C to +85°C
Junction Temperature.....................................................................................+150°C
Storage Temperature Range ..........................................................-65°C to +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 operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

The MAX4295/MAX4297 mono/stereo, switch-mode (Class-D) audio power amplifiers operate from a single +2.7V to +5.5V supply. They have >85% efficiency and are capable of delivering 2W continuous power to a 4 load, making them ideal for portable multimedia and general-purpose high-power audio applications.

The MAX4295/MAX4297 feature a total harmonic distortion plus noise (THD+N) of 0.4% (fOSC = 125kHz), low quiescent current of 2.8mA (MAX4295) or 4.6mA (MAX4297), high efficiency, and clickless power-up and shutdown. The SHDN input disables the device and limits supply current to <1.5A (MAX4295) or <2.3A (MAX4297). Other features include a 1A current limit, thermal protection, and under-voltage lockout.

The MAX4295 (mono) and MAX4297 (stereo) reduce the number of required external components. Both devices have internal high-speed power-MOS transistors, allowing operation as bridge-tied load (BTL) amplifiers. The BTL configuration eliminates the need for isolation capacitors on the output. The frequency-selectable pulse-width modulator (PWM) allows the user to optimize the size and cost of the output filter.

The MAX4295 is offered in a space-saving 16-pin QSOP package, and the MAX4297 is offered in a compact 24-pin SSOP package.