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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
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% (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 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 (RL = 4, PO = 2W, MAX4295)
o 0.4% THD+N (RL = 4, fOSC = 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
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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Mono/Stereo 2W Switch-Mode (Class-D)
Audio Power Amplifiers
ABSOLUTE MAXIMUM RATINGS
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.
ELECTRICAL CHARACTERISTICS
(VCC = PVCC = +5V, SHDN = VCC, FS1 = GND, FS2 = VCC (fOSC = 250kHz), input amplifier gain = -1V/V, TA = TMIN to TMAX, unless
otherwise noted. Typical values are TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
GENERAL
Supply Voltage Range
(Note 2)
2.7 5.5 V
Quiescent Supply Current
Output load not
connected
MAX4295
MAX4297
2.8 4
mA
4.6 8
Shutdown Supply Current
SHDN = GND
MAX4295
MAX4297
1.5 8
µA
2.5 15
Voltage at VCM Pin
0.285 × 0.3 × 0.315 ×
VCC
VCC
VCC
V
FS1 = GND, FS2 = GND
105 125 145
PWM Frequency
FS1 = GND, FS2 = VCC
FS1 = VCC, FS2 = GND
FS1 = VCC, FS2 = VCC
210 250 290
kHz
420 500 580
840 1000 1160
PWM Frequency Change with
VCC
Duty Cycle
Duty Cycle Change with VCC
Switch On-Resistance
(each power device)
H-Bridge Output Leakage
VCC = 2.7V to 5.5V
VIN = 0.06 × VCC
VIN = 0.30 × VCC
VIN = 0.54 × VCC
VIN = 0.3 × VCC, VCC = 2.7V to 5.5V
IOUT = 150mA
VCC = 5V
VCC = 2.7V
SHDN = GND
±1 ±3 kHz/V
10.2
49.2
86.2
12
50
88
±0.02
0.25
0.35
0
13.8
50.8
89.8
±0.15
0.5
1.0
±5
%
%/V
µA
H-Bridge Current Limit
1A
Soft-Start Capacitor Charging
Current
VSS = 0
0.75 1.35 1.95 µA
Undervoltage Lockout
1.8 2.2 2.6
V
Thermal Shutdown Trip Point
145 °C
2 _______________________________________________________________________________________

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Mono/Stereo 2W Switch-Mode (Class-D)
Audio Power Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(VCC = PVCC = +5V, SHDN = VCC, FS1 = GND, FS2 = VCC (fOSC = 250kHz), input amplifier gain = -1V/V, TA = TMIN to TMAX, unless
otherwise noted. Typical values are TA = +25°C.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range
Maximum Output Power
VCC = +3V, fIN = 1kHz
VCC = +5V, fIN = 1kHz
RL = 8
RL = 4
RL = 8
RL = 4
THD Plus Noise
RL = 4, fIN = 1kHz, PO = 1W, fOSC = 125kHz
Efficiency
MAX4295, RL = 4, fIN = 1kHz, PO = 2W
Channel Isolation
MAX4297, fIN = 1kHz, PO = 2W
LOGIC INPUTS (SHDN, FS1, FS2)
0 to 0.6
x VCC
0.4
0.7
1.2
2
0.4
87
45
V
W
%
%
dB
Logic Input Current
VLOGIC = 0 to VCC
1 100 nA
Logic Input High Voltage
0.7 ×
VCC
V
Logic Input Low Voltage
INPUT AMPLIFIER
Input Offset Voltage
VOS Temp Coefficient
Input Bias Current
Input Noise Voltage Density
(Note 3)
f = 10kHz
0.3 ×
VCC
V
±0.5
±5
±0.05
32
±4 mV
µV/°C
±25 nA
nV/Hz
Input Capacitance
Output Resistance
2.5
0.01
pF
AOUT Disabled Mode Leakage
Current
SHDN = GND, VAOUT = 0 to VCC
±0.1
±1
µA
Short-Circuit Current
Large-Signal Voltage Gain
AOUT Voltage Swing
Gain Bandwidth Product
Power-Supply Rejection
Maximum Capacitive Load
AOUT to GND
AOUT to VCC
VOUT = 0.2V to 4.6V, RL(OPAMP) = 10k
VDIFF 10mV,
RL(OPAMP) = 10k
VCC - VOH
VOL
VCC = +2.7V to +5.5V
No sustained oscillations
8
mA
65
78 115
dB
40 250
mV
40 100
1.25 MHz
66 90
dB
200 pF
Note 1: All devices are 100% production tested at TA = 25°C. All temperature limits are guaranteed by design.
Note 2: Supply Voltage Range guaranteed by PSRR of input amplifier, frequency, duty cycle, and H-bridge on-resistance.
Note 3: Guaranteed by design, not production tested.
_______________________________________________________________________________________ 3

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Mono/Stereo 2W Switch-Mode (Class-D)
Audio Power Amplifiers
Typical Operating Characteristics
(VCC = PVCC = +3V, input amplifier gain = -1, SHDN = VCC , TA = +25°C, unless otherwise noted.)
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. INPUT FREQUENCY (VIN = 2.5Vp-p)
10
VCC = +5V
RL = 4
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. INPUT FREQUENCY (VIN = 2.5Vp-p)
10
VCC = +5V
RL = 8
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. INPUT FREQUENCY (VIN = 2.5Vp-p)
10
VCC = +5V
RL = 32
1MHz
125kHz
1
1MHz
1
125kHz
1 1MHz 125kHz
0.1
500kHz
250kHz
0.1 500kHz 250kHz
0.1
500kHz
250kHz
0.01
10
1k
INPUT FREQUENCY (Hz)
100k
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (fIN = 1kHz)
100
VCC = +5V
RL = 4
1MHz
10
1 250kHz
125kHz
500kHz
0.1
0.10
0
0.5 1.0 1.5 2.0
OUTPUT POWER (W)
2.5
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (fIN = 20kHz)
100
VCC = +5V
RL = 4
10
1MHz
1 125kHz
250kHz
0.1
500kHz
0.10
0
0.5 1.0 1.5 2.0
OUTPUT POWER (W)
2.5
0.01
10
1k
INPUT FREQUENCY (Hz)
100k
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (fIN = 1kHz)
100
VCC = +5V
RL = 8
10
125kHz
1MHz
1
0.1
500kHz 250kHz
0.10
0
0.3 0.6 0.9 1.2 1.5
OUTPUT POWER (W)
1.8
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (fIN = 20kHz)
10
VCC = +5V
RL = 8
1MHz
1
125kHz
0.1
0.01
0
500kHz
250kHz
0.3 0.6 0.9 1.2 1.5 1.8
OUTPUT POWER (W)
0.01
10
1k
INPUT FREQUENCY (Hz)
100k
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (fIN = 1kHz)
100
VCC = +5V
RL = 32
10 500kHz
1 1MHz
250kHz
0.1
125kHz
0.10
0
0.1 0.2 0.3 0.4
OUTPUT POWER (W)
0.5
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (fIN = 20kHz)
100
VCC = +5V
RL = 32
10
1MHz
1
0.1
0.10
0
125kHz
250kHz
500kHz
0.1 0.2 0.3 0.4
OUTPUT POWER (W)
0.5
4 _______________________________________________________________________________________

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Mono/Stereo 2W Switch-Mode (Class-D)
Audio Power Amplifiers
Typical Operating Characteristics (continued)
(VCC = PVCC = +3V, input amplifier gain = -1, SHDN = VCC , TA = +25°C, unless otherwise noted.)
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. INPUT FREQUENCY (VIN = 1.5Vp-p)
10 VCC = +3V
RL = 4
125kHz 1MHz
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. INPUT FREQUENCY (VIN = 1.5Vp-p)
10 VCC = +3V
RL = 8
1MHz
125kHz
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. INPUT FREQUENCY (VIN = 1.5Vp-p)
10
VCC = +3V
RL = 32
1MHz
125kHz
1 11
500kHz
0.1
250kHz
500kHz
0.1
250kHz
0.1
250kHz
500kHz
0.01
10
1k
INPUT FREQUENCY (Hz)
100k
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (fIN = 1kHz)
100
VCC = +3V
RL = 4
1MHz
10
250kHz
500kHz
1
125kHz
0.01
10
1k
INPUT FREQUENCY (Hz)
100k
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (fIN = 1kHz)
100
VCC = +3V
RL = 8
1MHz
10
500kHz
1
125kHz
0.1 250kHz
0.01
10
1k
INPUT FREQUENCY (Hz)
100k
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (fIN = 1kHz)
100
VCC = +3V
RL = 32
1MHz
10
500kHz
1
125kHz
0.1
250kHz
0.1
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7
OUTPUT POWER (W)
0.8
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (fIN = 20kHz)
100
VCC = +3V
RL = 4
1MHz
10
250kHz
1
500kHz
0.1 125kHz
0.10
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7
OUTPUT POWER (W)
0.8
0.10
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7
OUTPUT POWER (W)
0.8
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (fIN = 20kHz)
100
VCC = +3V
RL = 8
10 1MHz
125kHz
1
500kHz
0.1
250kHz
0.10
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7
OUTPUT POWER (W)
0.8
0.10
0
0.05 0.10 0.15
OUTPUT POWER (W)
0.20
MAX4295
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. OUTPUT POWER (fIN = 20kHz)
100
VCC = +3V
RL = 32
10 1MHz
1
0.1
0.10
0
125kHz
250kHz
500kHz
0.05 0.10 0.15
OUTPUT POWER (W)
0.20
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