MAX9744ETH+T Maxim Integrated Products, MAX9744ETH+T Datasheet

IC AMP AUDIO PWR 22.5W D 44TQFN

MAX9744ETH+T

Manufacturer Part Number
MAX9744ETH+T
Description
IC AMP AUDIO PWR 22.5W D 44TQFN
Manufacturer
Maxim Integrated Products
Type
Class Dr
Datasheet
1.MAX9744ETH.pdf (28 pages)

Specifications of MAX9744ETH+T

Output Type
2-Channel (Stereo)
Max Output Power X Channels @ Load
22.5W x 2 @ 4 Ohm
Voltage - Supply
4.5 V ~ 14 V
Features
Depop, Mute, Short-Circuit and Thermal Protection, Shutdown, Volume Control
Mounting Type
Surface Mount
Package / Case
44-TQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX9744 20W stereo Class D audio power amplifi-
er provides Class AB amplifier performance with Class
D efficiency, conserving board space and eliminating
the need for a bulky heatsink. This device features sin-
gle-supply operation, adjustable gain, shutdown mode,
a SYNC output, speaker mute, and industry-leading
click-and-pop suppression.
The MAX9744 features a 64-step dual-mode (analog or
digital), programmable volume control and mute func-
tion. The MAX9744 operates from a 4.5V to 14V single
supply and can deliver up to 20W per channel into a
4Ω speaker with a 14V supply.
The MAX9744 offers two modulation schemes: a fixed-
frequency modulation mode that allows one of several
preset switching frequencies to be selected, and a
spread-spectrum modulation mode that helps to
reduce EMI-radiated emissions.
The MAX9744 features high 75dB PSRR, low 0.04%
THD+N, and SNR in excess of 90dB. Robust short-cir-
cuit and thermal-overload protection prevent device
damage during a fault condition. The MAX9744 is avail-
able in a 44-pin thin QFN-EP (7mm x 7mm x 0.8mm)
package and is specified over the extended -40°C to
+85°C temperature range.
19-4078; Rev 1; 9/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Flat-Panel Televisions
PC Speaker Systems
Multimedia Docking Stations
________________________________________________________________ Maxim Integrated Products
SYNC
20W Stereo Class D Speaker Amplifier
General Description
MAX9744
SHUTDOWN
CONTROL
CONTROL
ANALOG
3V TO 3.6V
MUTE
BIAS
I
2
C
Applications
CONTROL
VOLUME
OSCILLATOR
4.5V TO 14V
♦ Wide 4.5V to 14V Power-Supply Voltage Range
♦ Filterless Spread-Spectrum Modulation Lowers
♦ 20W Stereo Output (4Ω, V
♦ Integrated Volume Control (I
♦ Low 0.04% THD+N
♦ High 75dB PSRR
♦ High 93% Efficiency
♦ Integrated Click-and-Pop Suppression
♦ Low-Power Shutdown Mode
♦ Short-Circuit and Thermal-Overload Protection
♦ Available in a 44-Pin Thin QFN-EP (7mm x 7mm x
+ Denotes a lead-free/RoHS-compliant package.
* EP = Exposed pad.
Pin Configuration appears at end of data sheet.
MAX9744ETH+
SYNCOUT
Radiated RF Emissions from Speaker Cables
0.8mm)
PART
with Volume Control
Simplified Block Diagram
40
35
30
25
20
15
10
5
MAX9744 EMI WITH FERRITE BEAD FILTERS
30
-40°C to +85°C
TEMP RANGE
Ordering Information
(V
60
DD
80
= 12V, 1m CABLE, 8Ω LOAD)
100
EN5022 B LIMIT
120
FREQUENCY (MHz)
DD
140
2
160
= 12V, THD+N = 10%)
C or Analog)
180
200
PIN-PACKAGE
220
44 TQFN-EP*
Features
240
260
280
300
1

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MAX9744ETH+T Summary of contents

Page 1

... I C ANALOG CONTROL SYNC ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. with Volume Control ♦ Wide 4.5V to 14V Power-Supply Voltage Range ♦ Filterless Spread-Spectrum Modulation Lowers Radiated RF Emissions from Speaker Cables ♦ ...

Page 2

Stereo Class D Speaker Amplifier with Volume Control ABSOLUTE MAXIMUM RATINGS PVDD to PGND ....................................................................+16V V to GND ...........................................................................+4V DD FB_, SYNCOUT, SYNC, SDA/VOL, ADDR1, ADDR2 to GND........................................-0. BOOT_ to V ..........................................................-0.3V to +6V DD BOOT_ to ...

Page 3

Stereo Class D Speaker Amplifier ELECTRICAL CHARACTERISTICS (continued 12V 3.3V PVDD DD GND PGND = ∞, unless otherwise stated, C OUT_+ and OUT_ spectrum mode, filterless modulation mode, see the ...

Page 4

Stereo Class D Speaker Amplifier with Volume Control ELECTRICAL CHARACTERISTICS (continued 12V 3.3V PVDD DD GND PGND = ∞, unless otherwise stated, C OUT_+ and OUT_ spectrum mode, filterless modulation ...

Page 5

Stereo Class D Speaker Amplifier ELECTRICAL CHARACTERISTICS (continued 12V 3.3V PVDD DD GND PGND = ∞, unless otherwise stated, C OUT_+ and OUT_ spectrum mode, filterless modulation mode, see the ...

Page 6

Stereo Class D Speaker Amplifier with Volume Control (V = 12V 3.3V PVDD DD GND PGND OUT_+ and OUT_- with an inductor in series, 8Ω load 68µH, 4Ω load, L= 33µH. R ...

Page 7

Stereo Class D Speaker Amplifier (V = 12V 3.3V PVDD DD GND PGND OUT_+ and OUT_- with an inductor in series, 8Ω load 68µH, 4Ω load, L= 33µ 0.47µF, ...

Page 8

Stereo Class D Speaker Amplifier with Volume Control (V = 12V 3.3V PVDD DD GND PGND OUT_+ and OUT_- with an inductor in series, 8Ω load 68µH, 4Ω load, L= 33µH. R ...

Page 9

Stereo Class D Speaker Amplifier (V = 12V 3.3V PVDD DD GND PGND OUT_+ and OUT_- with an inductor in series, 8Ω load 68µH, 4Ω load, L= 33µ 0.47µF, ...

Page 10

Stereo Class D Speaker Amplifier with Volume Control (V = 12V 3.3V PVDD DD GND PGND OUT_+ and OUT_- with an inductor in series, 8Ω load 68µH, 4Ω load, L= 33µH. R ...

Page 11

Stereo Class D Speaker Amplifier (V = 12V 3.3V PVDD DD GND PGND OUT_+ and OUT_- with an inductor in series, 8Ω load 68µH, 4Ω load, L= 33µ 0.47µF, ...

Page 12

Stereo Class D Speaker Amplifier with Volume Control PIN NAME Left-Channel Positive Speaker Output Boost Flying-Capacitor Connection. Connect a 0.1µF 1 BOOTL+ ceramic capacitor between BOOTL+ and OUTL OUTL+ Left-Channel Speaker Output, Positive Phase 4, 5, 29, ...

Page 13

Stereo Class D Speaker Amplifier PIN NAME 26 SYNCOUT SYNC Signal Output 31, 32 OUTR+ Right-Channel Positive Speaker Output Right-Channel Positive Speaker Output Boost Flying-Capacitor Connection. Connect a 0.1µF 33 BOOTR+ ceramic capacitor between BOOTR+ and OUTR+. 34, 35, ...

Page 14

Stereo Class D Speaker Amplifier with Volume Control Spread-Spectrum Modulation Mode The MAX9744 features a unique spread-spectrum mode that flattens the wideband spectral components, improving EMI emissions that may be radiated by the speaker and cables. This mode is ...

Page 15

Stereo Class D Speaker Amplifier Table 2. Modulation Scheme Selection ADDR2 ADDR1 0 0 Analog volume control 0 0 Analog volume control The high efficiency of a Class D amplifier is due to the switching operation of the output ...

Page 16

Stereo Class D Speaker Amplifier with Volume Control For maximum flexibility, the MAX9744 features volume control operation using an analog voltage input or 2 through the I C interface. To set the device to analog mode, connect ADDR1 and ...

Page 17

Stereo Class D Speaker Amplifier One data bit is transferred during each SCL cycle. The data on SDA must remain stable during the high period of the SCL pulse. Changes in SDA while SCL is high are control signals ...

Page 18

Stereo Class D Speaker Amplifier with Volume Control A write to the MAX9744 includes transmission of a START condition, the slave address with the R/W bit set to 0 (see Table 3), one byte of data to the command ...

Page 19

Stereo Class D Speaker Amplifier Table 7. Speaker Volume Levels ...

Page 20

Stereo Class D Speaker Amplifier with Volume Control Table 7. Speaker Volume Levels (continued ...

Page 21

Stereo Class D Speaker Amplifier Applications Information Filterless Class D Operation The MAX9744 meets common EMC radiation limits with- out a filter when the speaker leads are less than approxi- mately 10cm. Using lengths beyond 10cm is possible verifying ...

Page 22

Stereo Class D Speaker Amplifier with Volume Control Component Selection Gain-Setting Resistors External feedback resistors set the gain of the MAX9744. The output stage has an internal 20dB gain in addition to the externally set input stage gain. Set ...

Page 23

Stereo Class D Speaker Amplifier Supply Bypassing, Layout, Proper layout and grounding are essential for optimum performance. Use large traces for the power-supply inputs and amplifier outputs to minimize losses due to parasitic trace resistance. Large traces also aid ...

Page 24

Stereo Class D Speaker Amplifier with Volume Control 1μ 20kΩ 0.47μF 20kΩ 0.47μF 20kΩ 20kΩ MUTE 24 SHDN 22 SDA/VOL TO μC SCLK 9 ADDR1 13 ADDR2 ...

Page 25

Stereo Class D Speaker Amplifier Functional Diagrams/Typical Application Circuits (continued) 1μ 20kΩ C FBL 0.47μF 20kΩ INL 0.47μF 20kΩ INR 19 FBR 20kΩ MUTE 24 ...

Page 26

Stereo Class D Speaker Amplifier with Volume Control For the latest package outline information and land patterns www.maxim-ic.com/packages. E/2 D ______________________________________________________________________________________ E DETAIL A e (ND- Package ...

Page 27

Stereo Class D Speaker Amplifier For the latest package outline information and land patterns www.maxim-ic.com/packages. Chip Information PROCESS: BICMOS ______________________________________________________________________________________ with Volume Control Package Information (continued) PACKAGE OUTLINE, 32, 44, 48, 56L THIN QFN, 7x7x0.8mm 21-0144 PACKAGE ...

Page 28

... 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. 28 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products DESCRIPTION is a registered trademark of Maxim Integrated Products, Inc ...

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