MAX4295(2005) Ver la hoja de datos (PDF) - Maxim Integrated
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MAX4295 Datasheet PDF : 15 Pages
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19-1746; Rev 3; 3/05
Mono, 2W, Switch-Mode (Class D)
Audio Power Amplifier
General Description
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 gener-
al-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 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 transis-
tors allow operation as a bridge-tied load (BTL) amplifi-
er. The BTL configuration eliminates the need for
isolation capacitors on the output. The frequency-selec-
table 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.
Applications
Palmtop/Notebook
Computers
PDA Audio
Sound Cards
Game Cards
Boom Boxes
AC Amplifiers
Battery-Powered Speakers
Cordless Phones
Portable Equipment
Features
♦ +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)
♦ 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 or Narrow SO
PART
MAX4295EEE
MAX4295ESE
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
16 Narrow SO
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
RF
AUDIO CIN
RIN
INPUT
2.7V TO 5.5V
ON
OFF
AOUT
IN
VCC
GND
GND
VCM
SHDN
FS1
FS2
MAX4295
OUT+
OUT-
PVCC
PVCC
PGND
PGND
SS
2.7V TO 5.5V
________________________________________________________________ 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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