MAX9730 Maxim Integrated Products, MAX9730 Datasheet - Page 10

• Manufacturer Part Number: MAX9730
• Description: Class G Power Amplifier
• Manufacturer: Maxim Integrated Products

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Class G amplifiers provide much better efficiency and
thermal performance than a comparable Class AB
amplifier. However, the system’s thermal performance
must be considered with realistic expectations and
include consideration of many parameters. This section
examines Class G amplifiers using general examples to
illustrate good design practices.
The exposed pad is the primary route of keeping heat
away from the IC. With a bottom-side exposed pad, the
PCB and its copper become the primary heatsink for
the Class G amplifier. Solder the exposed pad to a
large copper polygon that is connected to the ground
plane.
2.4W, Single-Supply, Class G Power Amplifier
10
______________________________________________________________________________________
( ) UCSP PACKAGE
DEVICE SHOWN WITH A
*SYSTEM-LEVEL REQUIREMENT TYPICALLY 10μF
1μF
1μF
C
C
IN
IN
Thermal Considerations
10kΩ
10kΩ
R
R
IN-
IN-
V
= 12dB
10kΩ
10kΩ
TQFN Considerations
R
R
FB+
FB-
12 (B4)
10 (B5)
9 (A5)
7 (A4)
Typical Application Circuit/Functional Diagram
18 (D3)
FB+
IN+
IN-
FB-
GND
SHDN
27 (A1)
1 (B2)
CPGND
+
-
V
CC
26 (B1)
14, 22
(D1, D5)
C1N
MAX9730
The copper polygon to which the exposed pad is
attached should have multiple vias to the opposite side
of the PCB, where they connect to GND. Make this
polygon as large as possible within the system’s con-
straints.
For the latest application details on UCSP construction,
dimensions, tape carrier information, PCB techniques,
bump-pad layout, and recommended reflow tempera-
ture profile, as well as the latest information on reliability
testing results, go to the Maxim website at www.maxim-
ic.com/ucsp for the application note, UCSP—A Wafer-
Level Chip-Scale Package .
CPV
4.7μF
V
C1
DD
CHARGE
DD
CLASS G
4 (A3)
OUTPUT
PUMP
STAGE
UCSP Applications Information
C1P
3 (A2) 24 (C1)
PV
0.1μF
SS
(C2, C4)
15, 21
SV
*
OUT+
OUT-
SS
FS
20 (D2)
16 (D4)
13 (C5)
C2
10μF
R
100kΩ
FS