MAX4297EAG Maxim Integrated Products, MAX4297EAG Datasheet

IC AMP AUDIO PWR 2W STER 24SSOP

MAX4297EAG

Manufacturer Part Number
MAX4297EAG
Description
IC AMP AUDIO PWR 2W STER 24SSOP
Manufacturer
Maxim Integrated Products
Type
Class Dr
Datasheet
1.MAX4297EAG.pdf (18 pages)

Specifications of MAX4297EAG

Output Type
2-Channel (Stereo)
Max Output Power X Channels @ Load
2W x 2 @ 4 Ohm
Voltage - Supply
2.7 V ~ 5.5 V
Features
Depop, Short-Circuit and Thermal Protection, Shutdown
Mounting Type
Surface Mount
Package / Case
24-SSOP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Meier Automation Equipment Co., Limited Meier Automation Equipment Co., Limited
Part Number:
MAX4297EAG
Manufacturer:
MAXIM/美信
Quantity:
20 000
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
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.
Palmtop/Notebook
Computers
PDA Audio
Sound Cards
Game Cards
19-1746; Rev 1; 2/01
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.
________________________________________________________________ Maxim Integrated Products
Mono/Stereo 2W Switch-Mode (Class-D)
INPUTR
INPUTL
General Description
V
V
CC
CC
CIN
CIN
Boom Boxes
AC Amplifiers
Battery-Powered Speakers
Cordless Phones
Portable Equipment
RIN
RIN
OSC
Applications
= 125kHz), low
RF
RF
14
12
11
22
15
1
2
CSS
AOUTL
AOUTR
INR
FS1
FS2
INL
SHDN
24
SS
3
V
V
CC
CC
MAX4297
10
AGND
16, 21
4, 9,
V
V
Audio Power Amplifiers
18, 19
PVCC
PVCC
6, 7,
o +2.7V to +5.5V Single-Supply Operation
o 2W/Channel Output Power at 5V
o 87% Efficiency (R
o 0.4% THD+N (R
o Logic-Programmable PWM Frequency Selection
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
Pin Configurations appear at end of data sheet.
PGND
MAX4295EEE
MAX4295ESE
MAX4297EAG
MAX4297EWG
OUT+R
OUT+L
OUT-R
OUT-L
VCM*
0.7W/Channel Output Power at 3V
(125kHz, 250kHz, 500kHz, 1MHz)
16-Pin QSOP (MAX4295)
24-Pin SSOP (MAX4297)
PART
5
17
13
20
8
*DO NOT CONNECT.
L2A
L1A
L1B
L2B
+
C2A
C1A
C1B
C2B
Typical Operating Circuit
L
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
= 4Ω, f
L
Ordering Information
= 4Ω, P
OSC
O
= 125kHz)
= 2W, MAX4295)
PIN-PACKAGE
16 QSOP
16 Narrow SO
24 SSOP
24 Wide SO
Features
1

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MAX4297EAG Summary of contents

Page 1

... 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 Applications MAX4297EAG MAX4297EWG Pin Configurations appear at end of data sheet PVCC 16 ...

Page 2

Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers ABSOLUTE MAXIMUM RATINGS GND or PGND....................................-0. PGND to GND.....................................................................±0. .......................................................................±0. VCM, SS, AOUT_, IN_ ................................-0. SHDN, FS1, FS2 ...

Page 3

Mono/Stereo 2W Switch-Mode (Class-D) ELECTRICAL CHARACTERISTICS (continued) = +5V, SHDN = FS1 = GND, FS2 = otherwise noted. Typical values are T A PARAMETER Input Voltage Range V CC Maximum Output ...

Page 4

Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers = +3V, input amplifier gain = -1, SHDN = MAX4295 TOTAL HARMONIC DISTORTION PLUS NOISE vs. INPUT FREQUENCY (V = 2.5Vp- +5V CC ...

Page 5

Mono/Stereo 2W Switch-Mode (Class-D) = +3V, input amplifier gain = -1, SHDN = MAX4295 TOTAL HARMONIC DISTORTION PLUS NOISE vs. INPUT FREQUENCY (V = 1.5Vp- + 4Ω ...

Page 6

Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers = +3V, input amplifier gain = -1, SHDN = MAX4297 TOTAL HARMONIC DISTORTION PLUS NOISE vs. INPUT FREQUENCY (V = 2.5Vp- +5V CC ...

Page 7

Mono/Stereo 2W Switch-Mode (Class-D) = +3V, input amplifier gain = -1, SHDN = MAX4297 TOTAL HARMONIC DISTORTION PLUS NOISE vs. INPUT FREQUENCY (V = 1. ...

Page 8

Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers = +3V, input amplifier gain = -1, SHDN = MAX4295 EFFICIENCY vs. OUTPUT POWER (f = 1kHz) IN 100 500kHz 250kHz 1MHz 60 50 ...

Page 9

Mono/Stereo 2W Switch-Mode (Class-D) = +3V, input amplifier gain = -1, SHDN = MAX4297 EFFICIENCY vs. OUTPUT POWER (f = 1kHz) IN 100 500kHz 1MHz 50 250kHz 40 30 125kHz ...

Page 10

Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers PIN NAME MAX4295 MAX4297 16 — — 5 OUT+L — 8 OUT 18, 19 PGND ...

Page 11

Mono/Stereo 2W Switch-Mode (Class-D) AOUT IN ✕ 0 (VCM) FS1 PWM OSC FS2 SS POWER MANAGEMENT AND PROTECTION CSS Figure 1a. MAX4295 Functional Diagram H-bridge. The switches work in pairs to reverse the polarity of the signal in ...

Page 12

Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers AOUTR INR FS1 PWM OSC FS2 INL AOUTL ✕ 0 (VCM) Figure 1b. MAX4297 Functional Diagram Low-Power Shutdown Mode The MAX4295/MAX4297 have a shutdown mode that reduces power consumption and extends ...

Page 13

Mono/Stereo 2W Switch-Mode (Class-D) The amplifier’s input bias current is low, ±50pA, and does not affect the choice of feedback resistors. The noise in the circuit increases as the value of RF increases. The optimum impedance seen by the inverting ...

Page 14

Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers An output filter is required to attenuate the PWM switch- ing frequency. Without the filter, the ripple in the load can substantially degrade efficiency and may cause interference problems with other electronic equipment. ...

Page 15

Mono/Stereo 2W Switch-Mode (Class-D) The inductor current rating should be higher than the peak current for a given output power requirement and should have relatively constant inductance over tem- perature and frequency. Typically, an open-core induc- tor is desirable since ...

Page 16

Mono/Stereo 2W Switch-Mode (Class-D) Audio Power Amplifiers a 10µF capacitor in parallel with a 1µF capacitor to GND. Ceramic capacitors are recommended due to their low ESR. Good PC board layout techniques optimize perfor- mance by decreasing the amount of ...

Page 17

Mono/Stereo 2W Switch-Mode (Class-D) ______________________________________________________________________________________ Audio Power Amplifiers Package Information 17 ...

Page 18

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2001 Maxim Integrated Products ...

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