MAX4295 Datasheet, PDF (1/18 Pages) Maxim Integrated Products – Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers

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 4Ω
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 <1.5µA (MAX4295) or <2.3µA
(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.
Applications
Palmtop/Notebook
Computers
PDA Audio
Sound Cards
Game Cards
Boom Boxes
AC Amplifiers
Battery-Powered Speakers
Cordless Phones
Portable Equipment
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 = 4Ω, P_O = 2W, MAX4295)
o 0.4% THD+N (R_L = 4Ω, 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)
PART
MAX4295EEE
MAX4295ESE
MAX4297EAG
MAX4297EWG
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
16 Narrow SO
24 SSOP
24 Wide SO
Pin Configurations appear at end of data sheet.
Typical Operating Circuit
INPUTL
CIN _RIN
INPUTR
CIN RIN
VCC
VCC
VCC
VPVCC
RF
1 _AOUTL
2 _INL
RF _{12 AOUTR}
11
INR
22 _SHDN
14 _FS1
15
FS2
SS
24
CSS
4, 9,
+
3
16, 21
VCC
VPVCC
MAX4297
OUT+L ⁵
OUT-L ²⁰
L1A
C1A
L1B
C1B
8
OUT+R
L2A
C2A
OUT-R ¹⁷
VCM* ¹³
L2B
C2B
AGND
10
PGND
6, 7,
18, 19
*DO NOT CONNECT.
________________________________________________________________ Maxim Integrated Products 1
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