MAX98400B Maxim Integrated Products, MAX98400B Datasheet

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MAX98400B

Manufacturer Part Number
MAX98400B
Description
Class D Amplifiers
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX98400B.pdf (26 pages)

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DataSheet.in
19-5286; Rev 0; 6/10
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.
The MAX98400A/MAX98400B Class D amplifiers provide
high-performance, thermally efficient amplifier solutions. The
MAX98400A delivers 2x20W into 8I loads or 1x40W into a
4I load. The MAX98400B delivers 2x12W into 8I loads.
An integrated limiting circuit prevents output clipping
distortion, protects small speakers from transient volt-
ages, and reduces power dissipation.
A thermal-foldback feature can be enabled to automati-
cally reduce the output power at above a junction tem-
perature of +120NC. Traditional thermal protection is also
available in addition to robust overcurrent protection.
The ICs operate from a single 8V to 28V supply and
provide a high 67dB PSRR, eliminating the need for a
regulated power supply. They offer up to 90% efficiency
from a 12V supply.
Filterless modulation allows the ICs to pass EN55022B
EMI limits with 1m cables using only a low-cost ferrite
bead and small-value capacitor on each output.
Both devices feature eight digitally controlled gain settings.
Comprehensive click-and-pop reduction circuitry mini-
mizes noise coming into and out of shutdown.
The MAX98400A/MAX98400B are available in 36-pin
and 24-pin TQFN packages, respectively, and are speci-
fied over the -40NC to +85NC temperature range.
_______________________________________________________________ Maxim Integrated Products 1
Stereo, High-Power, Class D Amplifiers
General Description
INL+
INR+
INL-
INR-
*MAX98400A ONLY
CLIPPING
CLIPPING
LIMITER
LIMITER
MAX98400A/B
PGA
PGA
Note: Devices operate over the -40°C to +85°C temperature
range.
*EP = Exposed pad.
S
S
S
S
S
S
S
AND H-BRIDGE
AND H-BRIDGE
MAX98400AETX+
MAX98400BETG+
MODULATOR
MODULATOR
Wide 8V to 28V Supply Voltage Range
Single-Supply Operation
Low EMI: Active Emissions Limiting
Clipping Limiter
Low Quiescent Current
Thermal Foldback
Thermal and Overcurrent Protection
CLASS D
CLASS D
LCD/PDP Televisions
LCD Monitors
MP3 Docking Stations
Notebook PCs
PART
OUTL-
OUTL+
MONO*
OUTR-
OUTR+
Simplified Block Diagram
Ordering Information
PIN-PACKAGE
36 TQFN-EP*
24 TQFN-EP*
Applications
Features
2x20W
2x12W
SPEC

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MAX98400B Summary of contents

Page 1

... The MAX98400A/MAX98400B Class D amplifiers provide high-performance, thermally efficient amplifier solutions. The MAX98400A delivers 2x20W into 8I loads or 1x40W into a 4I load. The MAX98400B delivers 2x12W into 8I loads. An integrated limiting circuit prevents output clipping distortion, protects small speakers from transient volt- ages, and reduces power dissipation. ...

Page 2

DataSheet.in Stereo, High-Power, Class D Amplifiers Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 3

... DataSheet.in Stereo, High-Power, Class D Amplifiers Figure 1. MAX98400B EMI Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 2. MAX98400A Efficiency vs. Class AB Effifciency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Figure 3. Limiter Control, Mode3 Configuration (Table Figure 4. Output Filter for PWM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Table 1. Limiter Control Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 2. Gain Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Table 3. Filter Component Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 lisT of figures lisT of Tables ...

Page 4

DataSheet.in Stereo, High-Power, Class D Amplifiers ABSOLUTE MAXIMUM RATINGS PVDD to PGND ......................................................-0.3V to +30V V to GND ...............................................................-0.3V to +6V S SHDN, MONO to GND ............................................-0.3V to +6V IN_ to GND ..............................................................-0.3V to +6V G1, G2, RELEASE, TEMPLOCK, LIM_TH ...

Page 5

... Left-to-Right Gain Matching Crosstalk Output Offset Voltage Click-and-Pop Level PVDD Power-Supply Rejection Ratio V Power-Supply Rejection Ratio S MAX98400A Output Power MAX98400B Output Power Total Harmonic Distortion Plus Noise Output Noise Efficiency Current Limit Output FET Resistance Switching Frequency Peak Output Voltage LIMITER ...

Page 6

... Note 3: The MAX98400A stereo mode is specified with an 8I resistive load in series with a 68FH inductive load connected across BTL outputs. The MAX98400A mono mode is specified with a 4I resistive load in series with 33FH inductive load. The MAX98400B is specified with an 8I resistive load in series with a 68FH inductive load connected across BTL outputs. Note 4: Amplifier inputs AC-coupled to GND. ...

Page 7

DataSheet.in Stereo, High-Power, Class D Amplifiers (MAX98400A 18V, V PVDD 1FF, typical values are at T REL TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY OUT 0.1 P OUT ...

Page 8

DataSheet.in Stereo, High-Power, Class D Amplifiers (MAX98400A 18V, V PVDD 1FF, typical values are at T REL EFFICIENCY vs. OUTPUT POWER 100 ...

Page 9

DataSheet.in Stereo, High-Power, Class D Amplifiers (MAX98400A 18V, V PVDD 1FF, typical values are at T REL INBAND OUTPUT SPECTRUM 0 -20 -40 -60 -80 -100 -120 FREQUENCY (kHz) ...

Page 10

DataSheet.in Stereo, High-Power, Class D Amplifiers (MAX98400A 18V, V PVDD 1FF, typical values are at T REL TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER (MONO 6kHz 0.1 ...

Page 11

DataSheet.in Stereo, High-Power, Class D Amplifiers (MAX98400A 18V, V PVDD 1FF, typical values are at T REL OUTPUT POWER vs. LOAD (MONO THD+N ...

Page 12

... R and R resistor-divider to have an absolute threshold. LIM1 LIM2 Pin Configurations TOP VIEW PGND 19 12 PGND 20 11 PVDD 21 10 MAX98400B PVDD 22 9 PGND PGND TQFN Pin Descriptions FUNCTION to GND with a 1μF capacitor. Connect to a ...

Page 13

... DataSheet.in Stereo, High-Power, Class D Amplifiers PIN MAX98400A MAX98400B — 26, 27 17, 18 19, 20, 29, 30, 34, 35 23, 24 31, 32, 33 21, 22 — — NAME INL+ Left-Channel Positive Analog Input INL- Left-Channel Negative Analog Input Mono Operation. Connect MONO to GND for stereo operation. Connect MONO ...

Page 14

DataSheet.in Stereo, High-Power, Class D Amplifiers C IN 1.0µF LEFT C IN INPUT 1.0µF TEMPLOCK C IN 1.0µF RIGHT C IN INPUT 1.0µF 14 Stereo Configuration for MAX98400A 8V TO 28V BULK 1.0µF 1.0µF 200µF V PVDD ...

Page 15

... The MAX98400A/MAX98400B Class D amplifiers pro- vide high-performance, thermally efficient amplifier solu- tions. The MAX98400A delivers 2x20W into 8I loads or 1x40W into a 4I load. The MAX98400B delivers 2x12W into 8I loads. An integrated limiting circuit prevents output clipping distortion and protects small speakers from transient voltages ...

Page 16

... DataSheet.in Stereo, High-Power, Class D Amplifiers The MAX98400A/MAX98400B are available in 36-pin and 24-pin TQFN packages, respectively, and are specified over the -40NC to +85NC temperature range. The high efficiency of a Class D amplifier is due to the switching operation of the output stage transistors Class D amplifier, the output transistors act as switches and consume negligible power ...

Page 17

... THRESH PVDD limited to 10%. LIM1 = 270kI gives both an unloaded voltage of 1.82V THRESH . This limits the output clipping PVDD Release Time Control (RELEASE GND. Choose C REL limit is 2.2FF. REL MAX98400A PVDD MAX98400B PVDD PVDD V S REGULATOR 1.0 µ F LIMITER R LIM2 CONTROL LIM_TH ...

Page 18

DataSheet.in Stereo, High-Power, Class D Amplifiers Preamplifier Gain Setting The ICs offer eight pin-selectable gain settings, select- able through the G1 and G2 pins. The ICs feature overcurrent protection and two types of thermal protection: thermal foldback and overtempera- ture ...

Page 19

DataSheet.in Stereo, High-Power, Class D Amplifiers Inductor-Based Output Filters Some applications use the ICs with a full inductor-/ capacitor-based (L/C) output filter. See Figure 4 for the correct connections of these components. The load impedance of the speaker determines the ...

Page 20

DataSheet.in Stereo, High-Power, Class D Amplifiers TEMPLOCK 20 V PVDD S 6 31, 32, 33 MONO REGULATOR 13 INL+ 11 CLIPPING PGA LIMITER INL THERMAL FOLDBACK INR+ 17 CLIPPING PGA LIMITER INR- 16 LIMITER GAIN CONTROL SELECTION 10 ...

Page 21

... LIMITER INL THERMAL FOLDBACK INR+ 12 CLIPPING PGA LIMITER INR- 11 LIMITER GAIN CONTROL SELECTION LIM_TH RELEASE G1 G2 MAX98400B 3 OUTL OUTL- POWER STAGE 16 OUTR+ WITH THERMAL AND 17, 18 OUTR- OVERCURRENT PROTECTION BIAS AND OSCILLATOR 19, 20 23, 24 SHDN GND ...

Page 22

DataSheet.in Stereo, High-Power, Class D Amplifiers For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix ...

Page 23

DataSheet.in Stereo, High-Power, Class D Amplifiers For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix ...

Page 24

DataSheet.in Stereo, High-Power, Class D Amplifiers For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix ...

Page 25

DataSheet.in Stereo, High-Power, Class D Amplifiers For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix ...

Page 26

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 26 2010 Maxim Integrated Products © ...

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