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MAX9788 데이터시트 PDF




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부품번호 MAX9788 기능
기능 Class G Ceramic Speaker Driver
제조업체 Maxim Integrated
로고 Maxim Integrated 로고


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MAX9788 데이터시트, 핀배열, 회로
19-0710; Rev 3; 5/08
EVAALVUAAILTAIOBNLEKIT
14VP-P, Class G Ceramic Speaker Driver
General Description
The MAX9788 features a mono Class G power amplifier
with an integrated inverting charge-pump power supply
specifically designed to drive the high capacitance of a
ceramic loudspeaker. The charge pump can supply
greater than 700mA of peak output current at 5.5VDC,
guaranteeing an output of 14VP-P.
The MAX9788 maximizes battery life by offering high-
performance efficiency. Maxim’s proprietary Class G
output stage provides efficiency levels greater than
Class AB devices without the EMI penalties commonly
associated with Class D amplifiers.
The MAX9788 is ideally suited to deliver the high out-
put-voltage swing required to drive ceramic/piezoelec-
tric speakers.
The device utilizes fully differential inputs and outputs,
comprehensive click-and-pop suppression, shutdown
control, and soft-start circuitry. The MAX9788 is fully spec-
ified over the -40°C to +85°C extended temperature range
and is available in small lead-free 28-pin TQFN (4mm x
4mm) or 20-bump WLP (2mm x 2.5mm) packages.
Cell Phones
Smartphones
MP3 Players
Applications
Personal Media Players
Handheld Gaming
Consoles
Notebook Computers
Features
Integrated Charge-Pump Power Supply—No
Inductor Required
14VP-P Voltage Swing into Piezoelectric Speaker
2.7V to 5.5V Single-Supply Operation
Clickless/Popless Operation
Small Thermally Efficient Packages
4mm x 4mm 28-Pin TQFN
2mm x 2.5mm 20-Bump WLP
Ordering Information
PART
PIN-PACKAGE
MAX9788EWP+TG45 20 WLP
MAX9788ETI+
28 TQFN-EP*
+Denotes a lead-free package.
T = Tape and reel.
G45 indicates protective die coating.
*EP = Exposed pad.
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
Typical Application Circuit/Functional Diagram and Pin
Configurations appear at end of data sheet.
Simplified Block Diagram
2.7V TO 5.5V
VCC CPVDD
FB+
MAX9788
CIN
RFB+
RIN+
IN+ +
IN- -
CIN
RIN-
RFB-
FB-
CLASS G
OUTPUT
STAGE
OUT+
OUT-
CHARGE
PUMP
GND CPGND
________________________________________________________________ Maxim Integrated Products 1
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.




MAX9788 pdf, 반도체, 판매, 대치품
14VP-P, Class G Ceramic Speaker Driver
Typical Operating Characteristics
(VCC = VCPVDD = VSHDN = 3.6V, VGND = VCPGND = 0V, RIN+ = RIN- = 10kΩ, RFB+ = RFB- = 10kΩ, RFS = 100kΩ, C1 = 4.7µF, C2 =
10µF, ZL = 1µF + 10Ω; load terminated between OUT+ and OUT-, unless otherwise stated; TA = TMIN to TMAX, unless otherwise noted.
Typical values are at TA = +25°C.) (Notes 1, 2)
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
10
VCC = 2.7V
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
10
VCC = 3.6V
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. FREQUENCY
10
VCC = 5V
1
VOUT = 3VRMS
0.1
1
VOUT = 4VRMS
0.1
1
VOUT = 5.9VRMS
0.1
0.01 VOUT = 1.25VRMS
0.01 VOUT = 1.9VRMS
0.01
VOUT = 3VRMS
0.001
10
100 1k 10k
FREQUENCY (Hz)
100k
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT VOLTAGE
10
VCC = 2.7V
1 fIN = 10kHz
fIN = 1kHz
0.1
0.001
10
100 1k 10k
FREQUENCY (Hz)
100k
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT VOLTAGE
10
VCC = 3.6V
1 fIN = 10kHz
fIN = 1kHz
0.1
0.001
10
100 1k 10k
FREQUENCY (Hz)
100k
TOTAL HARMONIC DISTORTION PLUS
NOISE vs. OUTPUT VOLTAGE
10
VCC = 5V
1 fIN = 10kHz
fIN = 1kHz
0.1
0.01
fIN = 20Hz
0.001
0
1 23 4
OUTPUT VOLTAGE (VRMS)
5
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
0
VRIPPLE = 200mVP-P
-10
-20
-30
-40
-50
-60
-70
-80
-90
10
100 1k 10k
FREQUENCY (Hz)
100k
0.01
0.001
0
100
fIN = 20Hz
1 2 34 5
OUTPUT VOLTAGE (VRMS)
POWER CONSUMPTION
vs. OUTPUT VOLTAGE
6
75
50
25
0
0
VCC = 2.7V
fIN = 1kHz
1% THD+N
12 3
OUTPUT VOLTAGE (VRMS)
4
0.01
fIN = 20Hz
0.001
0 1 23456 7 8
OUTPUT VOLTAGE (VRMS)
200
175
150
125
100
75
50
25
0
0
POWER CONSUMPTION
vs. OUTPUT VOLTAGE
VCC = 3.6V
fIN = 1kHz
1% THD+N
1234
OUTPUT VOLTAGE (VRMS)
5
4 _______________________________________________________________________________________

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MAX9788 전자부품, 판매, 대치품
14VP-P, Class G Ceramic Speaker Driver
Detailed Description
The MAX9788 Class G power amplifier with inverting
charge pump is the latest in linear amplifier technology.
The Class G output stage offers improved performance
over a Class AB amplifier while increasing efficiency to
extend battery life. The integrated inverting charge
pump generates a negative supply capable of deliver-
ing greater than 700mA.
The Class G output stage and the inverting charge
pump allow the MAX9788 to deliver a 14VP-P voltage
swing, up to two times greater than a traditional single-
supply linear amplifier.
Class G Operation
The MAX9788 Class G amplifier is a linear amplifier that
operates within a low (VCC to GND) and high (VCC to
SVSS) supply range. Figure 1 illustrates the transition
from the low to high supply range. For small signals,
the device operates within the lower (VCC to GND) sup-
ply range. In this range, the operation of the device
is identical to a traditional single-supply Class AB
amplifier where:
ILOAD = IN1
As the output signal increases so a wider supply is need-
ed, the device begins its transition to the higher supply
range (VCC to SVSS) for the large signals. To ensure a
seamless transition between the low and high supply
ranges, both of the lower transistors are on so that:
ILOAD = IN1 + IN2
As the output signal continues to increase, the transi-
tion to the high supply is complete. The device then
operates in the higher supply range, where the opera-
tion of the device is identical to a traditional dual-sup-
ply Class AB amplifier where:
ILOAD = IN2
During operation, the output common-mode voltage of
the MAX9788 adjusts dynamically as the device transi-
tions between supply ranges.
Utilizing a Class G output stage with an inverting
charge pump allows the MAX9788 to realize a 20VP-P
output swing with a 5V supply.
BTL CLASS G SUPPLY TRANSITION
VCC VCC VCC
IP
ON P
ZL
IP
ON P
ZL
IP
ON P
ZL
IN1
N1
ON
IN1
N1
ON
N1 OFF
N2 OFF
IN2
N2
ON
IN2
N2
ON
SVSS
LOW SUPPLY RANGE OPERATION
IP = IN1
SVSS
SUPPLY TRANSITION
IP = IN1 + IN2
SVSS
HIGH SUPPLY RANGE OPERATION
IP = IN2
Figure 1. Class G Supply Transition
_______________________________________________________________________________________ 7

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