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MAX4295 Datasheet

  • MAX4295

  • 2W Class D Mono Amplifier

  • 719.25KB

  • Maxim   Maxim

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19-1746; Rev 1; 2/01
Mono/Stereo 2W Switch-Mode (Class-D)
Audio Power Amplifiers
General Description
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鈩?/div>
load, making them ideal for portable multimedia and
general-purpose high-power audio applications.
The MAX4295/MAX4297 feature a total harmonic distor-
tion plus noise (THD+N) of 0.4% (f
OSC
= 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 lim-
its supply current to <1.5碌A(chǔ) (MAX4295) or <2.3碌A(chǔ)
(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 transis-
tors, allowing operation as bridge-tied load (BTL) ampli-
fiers. 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 package, and the MAX4297 is offered in a com-
pact 24-pin SSOP package.
Features
o
+2.7V to +5.5V Single-Supply Operation
o
2W/Channel Output Power at 5V
0.7W/Channel Output Power at 3V
o
87% Efficiency (R
L
= 4鈩? P
O
= 2W, MAX4295)
o
0.4% THD+N (R
L
= 4鈩? f
OSC
= 125kHz)
o
Logic-Programmable PWM Frequency Selection
(125kHz, 250kHz, 500kHz, 1MHz)
o
Low-Power Shutdown Mode
o
Clickless Transitions Into and Out of Shutdown
o
1A Current Limit and Thermal Protection
o
Available in Space-Saving Packages
16-Pin QSOP (MAX4295)
24-Pin SSOP (MAX4297)
MAX4295/MAX4297
Ordering Information
PART
MAX4295EEE
MAX4295ESE
MAX4297EAG
MAX4297EWG
TEMP. RANGE
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
-40擄C to +85擄C
PIN-PACKAGE
16 QSOP
16 Narrow SO
24 SSOP
24 Wide SO
Applications
Palmtop/Notebook
Computers
PDA Audio
Sound Cards
Game Cards
Boom Boxes
AC Amplifiers
Battery-Powered Speakers
Cordless Phones
Portable Equipment
Pin Configurations appear at end of data sheet.
Typical Operating Circuit
V
CC
V
PVCC
4, 9,
16, 21
V
PVCC
OUT+L
MAX4297
12
11
22
V
CC
14
AOUTR
INR
SHDN
FS1
OUT-R
V
CC
15
VCM*
FS2
SS
AGND
10
PGND
6, 7,
18, 19
*DO NOT CONNECT.
24
CSS
17
13
OUT+R
8
L2A
C2A
L2B
C2B
OUT-L
20
L1B
C1B
5
L1A
C1A
+
3
RF
CIN
INPUTL
RF
CIN
INPUTR
RIN
RIN
V
CC
1
2
AOUTL
INL
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

MAX4295 PDF文件相關(guān)型號(hào)

MAX4295EEE,MAX4295ESE,MAX4297,MAX4297EAG,MAX4297EWG

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