The MAX4295 mono, switch-mode (Class D) audio
power amplifier operates from a single +2.7V to +5.5V
supply. The MAX4295 has >85% efficiency and is
capable of delivering 2W continuous power to a 4Ω
load, making it ideal for portable multimedia and general-
purpose high-power audio applications.
The MAX4295 features a total harmonic distortion plus
noise (THD+N) of 0.4% (fOSC = 125kHz), low quiescent
current of 2.8mA, high efficiency, and clickless power-up
and shutdown. The active-low SHDN input disables the device
and limits supply current to <1.5µA. Other features
include a 1A current limit, thermal protection, and
undervoltage lockout.
The MAX4295 reduces the number of required external
components. Internal high-speed power-MOS transistors
allow operation as a bridge-tied load (BTL) amplifier.
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 or narrow SO package.
Key Features
Applications/Uses
+2.7V to +5.5V Single-Supply Operation
2W/Channel Output Power at 5V
0.7W/Channel Output Power at 3V
87% Efficiency (RL = 4Ω, POUT = 2W)
0.4% THD+N (RL = 4Ω, fOSC = 125kHz)
Logic-Programmable PWM Frequency Selection
(125kHz, 250kHz, 500kHz, 1MHz)
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