Datasheet MAX98304 Datasheet (MAXIM)

Page 1
19-5519; Rev 0; 9/10
EVALUATION KIT
AVAILABLE
Mono 3.2W Class D Amplifier
General Description
The MAX98304 mono 3.2W Class D amplifier provides Class AB audio performance with Class D efficiency. This device offers five selectable gain settings (0dB, 3dB, 6dB, 9dB, and 12dB) set by a single gain-select input (GAIN).
Active emissions-limiting, edge-rate, and overshoot con­trol circuitry greatly reduces EMI. A filterless spread­spectrum modulation scheme eliminates the need for output filtering found in traditional Class D devices. These features reduce application component count.
The IC's 0.95mA at 3.7V (1.2mA at 5V) quiescent current extends battery life in portable applications.
-40NC to +85NC temperature range.
Features
S Low Quiescent Current: 0.95mA at 3.7V
S Spread Spectrum and Active Emissions Limiting
S Five Pin-Selectable Gains
S 19µV
S 90dB PSRR
S Click-and-Pop Suppression
S Thermal and Overcurrent Protection
S Low-Current Shutdown Mode
S 1.0mm x 1.0mm, 9-Bump WLP (0.3mm Pitch)
Space-Saving Package
Ultra-Low Noise
RMS
MAX98304
Applications
Notebook and Netbook Computers
Cellular Phones
Tablets
MP3 Players
Portable Audio Players
VoIP Phones
Typical Application Circuit
+2.5V TO +5.5V
0.47µF
0.47µF
SHDN
GAIN
IN+
IN-
MAX98304
+2.5V TO +5.5V
PVDD
OUT+
OUT-
PGND
0.1µF
10µF*
Ordering Information
PART TEMP RANGE
MAX98304EWL+
+Denotes a lead(Pb)-free/RoHS-compliant package.
-40NC to +85NC
PIN­PACKAGE
9 WLP AIR
TOP
MARK
Bump Configuration
TOP VIEW
BUMP SIDE DOWN
MAX98304
1 2 3
+
OUT-
A
PGND
B
C
SHDN
N.C.
IN- IN+
PVDDOUT+
GAIN
*SYSTEM BULK CAPACITANCE
(1mm x 1mm x 0.64mm
_______________________________________________________________ Maxim Integrated Products 1
WLP
0.3mm PITCH)
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.
Page 2
Mono 3.2W Class D Amplifier
ABSOLUTE MAXIMUM RATINGS
PVDD, IN+, IN-, SHDN, GAIN to PGND ..................-0.3V to +6V
All Other Pins to PGND .........................-0.3V to (V
Continuous Current Into/Out of PVDD, PGND, OUT_ ... Q750mA
Continuous Input Current (all other pins) ........................ Q20mA
Duration of Short Circuit Between
OUT_ and PVDD, PGND .......................................Continuous
OUT+ and OUT- ....................................................Continuous
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
MAX98304
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.
PVDD
+ 0.3V)
ELECTRICAL CHARACTERISTICS
(V bandwidth 20Hz to 22kHz, TA = T
= V
PVDD
Supply Voltage Range PVDD Inferred from PSRR test 2.5 5.5 V Undervoltage Lockout UVLO PVDD falling 1.5 1.8 2.2 V
Quiescent Supply Current I
Shutdown Supply Current I Turn-On Time t
Bias Voltage V
Input Resistance R
Voltage Gain A
Output Offset Voltage V
Click and Pop K
Common-Mode Rejection Ratio CMRR fIN = 1kHz, input referred 80 dB
= 5.0V, V
SHDN
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
= 0V, AV = 12dB (GAIN = PGND), RL = J, RL connected between OUT+ to OUT-, AC measurement
PGND
MIN
to T
, unless otherwise noted. Typical values are at TA = +25NC.) (Notes 1, 2)
MAX
TA = +25NC
DD
V
= 3.7V 0.95
PVDD
V
SHDN
ON
BIAS
IN
V
OS
CP
= 0V, TA = +25NC
SHDN
TA = +25°C, single-ended
Connect GAIN to PGND 11.5 12 12.5
Connect GAIN to PGND through 100kI ±5%
Connect GAIN to PVDD 5.5 6 6.5
Connect GAIN to PVDD through 100kI ±5%
GAIN unconnected -0.5 0 +0.5
TA = +25°C (Note 3)
Peak voltage, A-weighted, 32 samples per second, RL = 8I (Notes 3, 4)
Continuous Power Dissipation (TA = +70NC) for Multilayer Board
9-Bump WLP (derate 10.6mW/NC) ..............................848mW
Junction Temperature .....................................................+150NC
Operating Temperature Range .......................... -40NC to +85NC
Storage Temperature Range ............................ -65NC to +150NC
Soldering Temperature (reflow) ......................................+260NC
1.2 1.8
< 0.1 10
3.4 10 ms
V
PVDD
/2
AV = 12dB 45 70 AV = 9dB 64 100 AV = 6dB 90 140 AV = 3dB 128 200 AV = 0dB 180 280
8.5 9 9.5
2.5 3 3.5
Q1 Q4.5
Into shutdown -74
Out of shutdown -60
mA
FA
V
kI
dB
mV
dBV
2 ______________________________________________________________________________________
Page 3
Mono 3.2W Class D Amplifier
ELECTRICAL CHARACTERISTICS (continued)
(V bandwidth 20Hz to 22kHz, TA = T
Note 1: This device is 100% production tested at +25NC. All temperature limits are guaranteed by design. Note 2: Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For RL = 4I,
Note 3: Amplifier inputs AC-coupled to ground. Note 4: Mode transitions controlled by SHDN.
PVDD
= V
SHDN
= 5.0V, V
= 0V, AV = 12dB (GAIN = PGND), RL = J, RL connected between OUT+ to OUT-, AC measurement
PGND
MIN
to T
, unless otherwise noted. Typical values are at TA = +25NC.) (Notes 1, 2)
MAX
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
72 90
Power-Supply Rejection Ratio (Note 3)
PSRR
V
= 2.5V to 5.5V, TA = +25NC
PVDD
V
= 200mV
RIPPLE
P-P
f = 217Hz 80 f = 1kHz 84 f = 20kHz 84 V
= 5.0V 3.2
PVDD
V
= 4.2V 2.2
PVDD
V
= 3.7V 1.7
PVDD
V
= 5.0V 2.6
PVDD
V
= 4.2V 1.8
PVDD
V
= 3.7V 1.4
PVDD
V
= 5.0V 1.8
PVDD
V
= 4.2V 1.2
PVDD
V
= 3.7V 0.96
PVDD
V
= 5.0V 1.4
PVDD
V
= 4.2V 1
PVDD
V
= 3.7V 0.8
PVDD
RL = 4I P
= 1W
OUT
RL = 8I P
= 0.7W
OUT
0.03 0.1
0.03
300 kHz
±12.5
93 %
Output Power P
Total Harmonic Distortion Plus Noise
THD+N fIN = 1kHz
Oscillator Frequency f Spread-Spectrum Bandwidth Efficiency
OUT
OSC
E P
THD+N = 10%, f = 1kHz, RL = 4I + 33FH
THD+N = 1%, f = 1kHz, RL = 4I + 33FH
THD+N = 10%, f = 1kHz, RL = 8I + 68FH
THD+N = 1%, f = 1kHz, RL = 8I + 68FH
= 1.75W, RL = 8I
OUT
AV = 12dB 31 AV = 9dB 26
Noise V
A-weighted (Note 3)
N
AV = 6dB 23 AV = 3dB 21 AV = 0dB 19
Output Current Limit I
LIM
2.8 A Thermal Shutdown Level 155 Thermal Shutdown Hysteresis 15
DIGITAL INPUT (SHDN)
Input-Voltage High V Input-Voltage Low V Input Leakage Current
V
INH
INL
= 2.5V to 5.5V 1.4 V
PVDD
V
= 2.5V to 5.5V 0.4 V
PVDD
TA = +25NC Q1 FA
L = 33FH. For RL = 8I, L = 68FH.
FV
MAX98304
dB
W
%
kHz
RMS
NC NC
_______________________________________________________________________________________ 3
Page 4
Mono 3.2W Class D Amplifier
Typical Operating Characteristics
(V
= V
PVDD
to 22kHz, TA = +25NC, unless otherwise noted.)
SHDN
= 5.0V, V
= 0V, AV = 6dB, RL = J, RL connected between OUT+ to OUT-, AC measurement bandwidth 20Hz
PGND
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
10
V
= 5V
PVDD
Z
= 4I + 33µH
LOAD
MAX98304
1
P
= 2W
OUT
0.1
THD+N (%)
0.01
0.001
P
= 1.5W
OUT
10 100k
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
10
V
= 5V
PVDD
Z
= 8I + 68µH
LOAD
1
0.1
THD+N (%)
0.01
P
= 1.2W
OUT
P
OUT
= 0.2W
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
10
V
= 4.2V
PVDD
Z
= 4I + 33µH
MAX98304 toc01
THD+N (%)
10k1k100
LOAD
1
0.1
0.01
P
OUT
0.001 10 100k
FREQUENCY (Hz)
P
= 0.5W
10k1k100
OUT
= 1W
MAX98304 toc02
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
10
V
= 4.2V
PVDD
Z
= 8I + 68µH
0.01
LOAD
1
0.1 P
= 0.6W
OUT
MAX98304 toc05
MAX98304 toc04
THD+N (%)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
10
V
= 3.7V
PVDD
Z
= 4I + 33µH
LOAD
1
0.1
THD+N (%)
0.01
0.001
P
= 0.8W
OUT
P
= 0.2W
OUT
10 100k
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
10
V
= 3.7V
PVDD
Z
= 8I + 68µH
LOAD
1
P
= 0.2W
OUT
0.1
THD+N (%)
0.01
MAX98304 toc03
10k1k100
= 0.4W
MAX98304 toc06
P
OUT
P
= 0.3W
0.001 10 100k
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
100
V
= 5V
PVDD
Z
= 4I + 33µH
LOAD
10
1
THD+N (%)
0.1
0.01
0.001 0 4.0
f = 6000Hz
f = 1000Hz
f = 100Hz
OUTPUT POWER (W)
10k1k100
0.001 10 100k
TOTAL HARMONIC DISTORTION PLUS
100
V
PVDD
Z
MAX98304 toc07
THD+N (%)
3.53.02.52.01.51.00.5
LOAD
10
1
0.1
0.01
0.001 0 2.5
OUT
10k1k100
FREQUENCY (Hz)
NOISE vs. OUTPUT POWER
= 4.2V
= 4I + 33µH
f = 6000Hz
f = 1000Hz
f = 100Hz
OUTPUT POWER (W)
0.001 10 100k
FREQUENCY (Hz)
TOTAL HARMONIC DISTORTION PLUS
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
100
MAX98304 toc08
10
THD+N (%)
0.1
0.01
2.01.51.00.5
0.001
NOISE vs. OUTPUT POWER
V
= 3.7V
PVDD
Z
= 4I + 33µH
LOAD
1
f = 6000Hz
f = 1000Hz
OUTPUT POWER (W)
f = 100Hz
4 ______________________________________________________________________________________
10k1k100
MAX98304 toc09
1.51.00.50
2.0
Page 5
Mono 3.2W Class D Amplifier
AMPLITUDE (dB)
Typical Operating Characteristics (continued)
(V
= V
PVDD
to 22kHz, TA = +25NC, unless otherwise noted.)
SHDN
= 5.0V, V
= 0V, AV = 6dB, RL = J, RL connected between OUT+ to OUT-, AC measurement bandwidth 20Hz
PGND
MAX98304
TOTAL HARMONIC DISTORTION PLUS
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
100
10
THD+N (%)
0.1
0.01
0.001
NOISE vs. OUTPUT POWER
V
= 5V
PVDD
Z
= 8I + 68µH
LOAD
1
f = 1000Hz
f = 100Hz
OUTPUT POWER (W)
f = 6000Hz
OUTPUT POWER vs. LOAD RESISTANCE
4.5
4.0
3.5
3.0
2.5
2.0
1.5
OUTPUT POWER (W)
1.0
0.5
0
1 1000
THD+N = 10%
THD+N = 1%
R
LOAD
10010
(I)
V
1.51.00.50
PVDD
= 5.0V
MAX98304 toc10
2.0
MAX98304 toc13
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
100
V
= 4.2V
PVDD
Z
= 8I + 68µH
LOAD
10
1
THD+N (%)
0.1
0.01
0.001
f = 6000Hz
f = 1000Hz
f = 100Hz
0 1.5
OUTPUT POWER (W)
OUTPUT POWER vs. LOAD RESISTANCE
2.5
2.0
1.5
1.0
OUTPUT POWER (W)
THD+N = 1%
0.5
0
1 1000
THD+N = 10%
R
(I)
LOAD
10010
V
PVDD
1.20.90.60.3
= 3.7V
100
MAX98304 toc11
THD+N (%)
0.01
0.001
MAX98304 toc14
OUTPUT POWER (W)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT POWER
V
= 3.7V
PVDD
Z
= 8I + 68µH
LOAD
10
1
0.1
0 1.2
f = 6000Hz
f = 1000Hz
f = 100Hz
1.00.80.60.40.2
OUTPUT POWER (W)
OUTPUT POWER vs. SUPPLY VOLTAGE
4.5 f = 1kHz
4.0 Z
= 4I + 33µH
LOAD
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
2.5 5.5
THD+N = 10%
THD+N = 1%
5.04.54.03.53.0
SUPPLY VOLTAGE (V)
MAX98304 toc12
MAX98304 toc15
OUTPUT POWER vs. SUPPLY VOLTAGE
2.5 f = 1kHz Z
= 8I + 68µH
LOAD
2.0
1.5
1.0
OUTPUT POWER (W)
0.5
0
2.5 5.5
THD+N = 10%
THD+N = 1%
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________ 5
GAIN vs. FREQUENCY
20
GAIN = PGND
10
MAX98304 toc16
0
GAIN = PVDD
-10
-20
-30
5.04.54.03.53.0
-40
GAIN = 100kI TO PGND
GAIN = 100kI TO PVDD
GAIN = UNCONNECTED
1k
FREQUENCY (Hz)
MAX98304 toc17
EFFICIENCY (%)
100k
10k10010
EFFICIENCY vs. OUTPUT POWER
100
90
80
Z
= 8I + 68µH
LOAD
70
60
50
40
30
20
10
0
0 3.5
OUTPUT POWER (W)
Z
LOAD
V
PVDD
= 4I + 33µH
= 5.0V
MAX98304 toc18
3.02.51.5 2.01.00.5
Page 6
Mono 3.2W Class D Amplifier
FREQUENCY (Hz)
Typical Operating Characteristics (continued)
(V
= V
PVDD
to 22kHz, TA = +25NC, unless otherwise noted.)
SHDN
= 5.0V, V
= 0V, AV = 6dB, RL = J, RL connected between OUT+ to OUT-, AC measurement bandwidth 20Hz
PGND
EFFICIENCY vs. OUTPUT POWER
100
90
MAX98304
80
Z
= 8I + 68µH
LOAD
70
60
50
40
EFFICIENCY (%)
30
20
10
0
0 2.0
OUTPUT POWER (W)
0
-10
-20
-30
-40
-50
PSRR (dB)
-60
-70
-80
-90
-100
2.5 5.5
V
= 3.7V
PVDD
MAX98304 toc19
Z
= 4I + 33µH
LOAD
1.51.00.5
POWER-SUPPLY REJECTION
RATIO vs. SUPPLY VOLTAGE
f = 1kHz V
= 200mV
RIPPLE
P-P
SUPPLY VOLTAGE (V)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
SUPPLY CURRENT (mA)
0.4
0.2
0
2.5 5.5 SUPPLY VOLTAGE (V)
MAX98304 toc22
5.04.54.03.53.0
0
-10
-20
MAX98304 toc20
-30
-40
-50
PSRR (dB)
-60
-70
-80
-90
5.04.54.03.53.0
-100 10 100k
COMMON-MODE REJECTION RATIO
vs. FREQUENCY
100
Z
= 8I + 68µH
LOAD
90
80
70
60
50
CMRR (dB)
40
30
20
10
AV = 9dB
AV = 12dB
0
POWER-SUPPLY REJECTION
RATIO vs. FREQUENCY
V
= 200mV
RIPPLE
Z
LOAD
AV = 3dB
= 8I + 68µH
FREQUENCY (Hz)
AV = 6dB
AV = 0dB
10k1k10010 100k
P-P
MAX98304 toc21
10k1k100
MAX98304 toc23
STARTUP RESPONSE
1ms/div
MAX98304 toc24
V
SHDN
2V/div
I
SPEAKER
100mA/div
SHUTDOWN RESPONSE
1ms/div
MAX98304 toc25
6 ______________________________________________________________________________________
V
SHDN
2V/div
I
SPEAKER
100mA/div
Page 7
Mono 3.2W Class D Amplifier
WLP
(1mm x 1mm x 0.64mm
0.3mm PITCH)
TOP VIEW
BUMP SIDE DOWN
MAX98304
+
OUT-
PGND
SHDN
IN- IN+
N.C.
GAIN
PVDDOUT+
1 2 3
B
C
A
Typical Operating Characteristics (continued)
(V
= V
PVDD
to 22kHz, TA = +25NC, unless otherwise noted.)
SHDN
= 5.0V, V
= 0V, AV = 6dB, RL = J, RL connected between OUT+ to OUT-, AC measurement bandwidth 20Hz
PGND
MAX98304
20
WIDEBAND vs. FREQUENCY
0
-20
-40
-60
OUTPUT MAGNITUDE (dBV)
-80
-100
FREQUENCY (MHz)
RBW = 100Hz
1010.1 100
MAX98304 toc26
0
-20
-40
-60
-80
-100
OUTPUT MAGNITUDE (dBV)
-120
-140
IN-BAND vs. FREQUENCY
f = 1kHz V
= -60dBV
OUT
10 100k
FREQUENCY (Hz)
10k1k100
MAX98304 toc27
Bump Configuration
TOP VIEW
BUMP SIDE DOWN
A
B
+
MAX98304
1 2 3
OUT-
PGND
N.C.
PVDDOUT+
GAIN
C
SHDN
(1mm x 1mm x 0.64mm
IN- IN+
WLP
0.3mm PITCH)
Bump Description
BUMP NAME FUNCTION
A1 OUT- Negative Speaker Output A2 OUT+ Positive Speaker Output A3 PVDD B1 PGND Ground B2 N.C. No Connection. Can be left unconnected, or connected to PGND. B3 GAIN Gain Select. See Table 1 for GAIN settings.
C1
SHDN Active-Low Shutdown Input. Drive SHDN low to place the device in shutdown.
C2 IN- Inverting Audio Input C3 IN+ Noninverting Audio Input
_______________________________________________________________________________________ 7
Power Supply. Bypass PVDD to PGND with 0.1FF || 10FF.
Page 8
Mono 3.2W Class D Amplifier
Detailed Description
The MAX98304 features low quiescent current, a low­power shutdown mode, comprehensive click-and-pop suppression, and excellent RF immunity.
The device offers Class AB audio performance with Class D efficiency in a minimal board-space solution.
The Class D amplifier features spread-spectrum modula­tion, edge-rate, and overshoot control circuitry that offers
MAX98304
significant improvements to switch-mode amplifier radi­ated emissions.
The amplifier features click-and-pop suppression that reduces audible transients on startup and shutdown. The amplifier includes thermal overload and short-circuit protection.
Class D Speaker Amplifier
The filterless Class D amplifier offers much higher effi­ciency than Class AB amplifiers. The high efficiency of a Class D amplifier is due to the switching operation of the output stage transistors. Any power loss associated with the Class D output stage is mostly due to the I2R loss of the MOSFET on-resistance and quiescent current overhead.
Ultra-Low EMI Filterless Output Stage
Maxim’s patented spread-spectrum modulation mode flattens wideband spectral components, while propri­etary techniques ensure that the cycle-to-cycle varia­tion of the switching period does not degrade audio reproduction or efficiency. The IC’s spread-spectrum modulator randomly varies the switching frequency by Q12.5kHz around the center frequency (300kHz). Above 10MHz, the wideband spectrum looks like noise for EMI purposes (Figure 1).
Speaker Current Limit
If the output current of the speaker amplifier exceeds the current limit (2.8A typ), the IC disables the outputs for approximately 100Fs. At the end of 100Fs, the outputs are reenabled. If the fault condition still exists, the IC continues to disable and reenable the outputs until the fault condition is removed.
Selectable Gain
The IC offers five programmable gain selections through a single gain input (GAIN).
Table 1. Gain Control Configuration
GAIN PIN MAXIMUM GAIN (dB)
Connect to PGND 12
Connect to PGND through 100kW ±5% resistor
Connect to PVDD 6
Connect to PVDD through 100kW ±5% resistor
Unconnected 0
9
3
90
70
50
EN55022B LIMIT
30
EMISSIONS LEVEL (dBµV/m)
10
-10
Figure 1. EMI with 60cm of Speaker Cable and No Output Filtering
8 ______________________________________________________________________________________
HORIZONTAL
VERTICAL
0 100 200 300 400 500 600 700 800 900 1000
FREQUENCY (MHz)
Page 9
Mono 3.2W Class D Amplifier
Shutdown
The IC features a low-power shutdown mode, drawing less than 0.1FA (typ) of supply current. Drive SHDN low to put the IC into shutdown.
Click-and-Pop Suppression
The IC speaker amplifier features Maxim’s comprehen­sive click-and-pop suppression. During startup, the click-and-pop suppression circuitry reduces any audible transient sources internal to the device. When entering shutdown, the differential speaker outputs ramp down to PGND quickly and simultaneously.
Applications Information
Filterless Class D Operation
Traditional Class D amplifiers require an output filter. The filter adds cost, size, and decreases efficiency and THD+N performance. The IC’s filterless modulation scheme does not require an output filter.
Because the switching frequency of the IC is well beyond the bandwidth of most speakers, voice coil movement due to the switching frequency is very small. Use a speaker with a series inductance > 10FH. Typical 8I speakers exhibit series inductances in the 20FH to 100FH range.
Component Selection
Power-Supply Input (PVDD)
PVDD powers the speaker amplifier. PVDD ranges from 2.5V to 5.5V. Bypass PVDD with a 0.1FF and 10FF capacitor to PGND. Apply additional bulk capacitance at the device if long input traces between PVDD and the power source are used.
Input Filtering
The input-coupling capacitor (CIN), in conjunction with the amplifier’s internal input resistance (RIN), forms a high­pass filter that removes the DC bias from the incoming signal. These capacitors allow the amplifier to bias the signal to an optimum DC level.
Assuming zero source impedance CIN is:
Layout and Grounding
MAX98304
Proper layout and grounding are essential for optimum performance. Good grounding improves audio perfor­mance and prevents switching noise from coupling into the audio signal.
The IC is inherently designed for excellent RF immunity. For best performance, add ground fills around all signal traces on top or bottom PCB planes.
WLP Applications Information
For the latest application details on WLP construction, dimensions, tape carrier information, PCB techniques, bump-pad layout, and recommended reflow tempera­ture profile, as well as the latest information on reliability testing results, refer to Application Note 1891: Wafer- level packaging (WLP) and its applications. Figure 2 shows the dimensions of the WLP balls used on the IC.
0.18mm
2 R
π ×
C [ F]
= F
IN
where f input resistance shown in the Electrical Characteristics table. Use capacitors with adequately low voltage-coef­ficient for best low-frequency THD performance.
is the -3dB corner frequency and RIN is the
-3dB
_______________________________________________________________________________________ 9
f
3dB
IN
0.18mm
Figure 2. MAX98304 WLP Ball Dimensions
Page 10
Mono 3.2W Class D Amplifier
Functional Diagram
2.5V TO 5.5V
MAX98304
0.47µF
0.47µF
SHDN
C1
B3GAIN
C3IN+
C2IN-
MAX98304
0.1µF
UVLO/POWER
MANAGEMENT
PVDD
A3
10µF*
CLICK-AND-POP
CLASS D
MODULATOR
B1
PGND
SUPPRESSION
LOW-EMI
DRIVER
LOW-EMI
DRIVER
PVDD
A1A2OUT-
PGND
PVDD
OUT+
PGND
*SYSTEM BULK CAPACITANCE
Chip Information
PROCESS: CMOS
10 _____________________________________________________________________________________
Page 11
Mono 3.2W Class D Amplifier
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
9 WLP W91D1+1
21-0486
MAX98304
______________________________________________________________________________________ 11
Page 12
Mono 3.2W Class D Amplifier
Revision History
REVISION
NUMBER
0 9/10 Initial release
REVISION
DATE
MAX98304
DESCRIPTION
PAGES
CHANGED
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.
12 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
©
2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
Loading...