MAX9730ETI+ Maxim Integrated Products, MAX9730ETI+ Datasheet - Page 7

• Manufacturer Part Number: MAX9730ETI+
• Description: IC AMP AUDIO PWR 2.4W G 28TQFN
• Manufacturer: Maxim Integrated Products
• Type: Class Gr

Specifications of MAX9730ETI+

• Output Type: 1-Channel (Mono)
• Max Output Power X Channels @ Load: 2.4W x 1 @ 8 Ohm
• Voltage - Supply: 2.7 V ~ 5.5 V
• Features: Depop, Differential Inputs, Shutdown
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Product: Class-G
• Output Power: 2.4 W
• Common Mode Rejection Ratio (min): 68 dB
• Thd Plus Noise: 0.12 %
• Supply Current: 8 mA
• Maximum Power Dissipation: 1667 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Audio Load Resistance: 8 Ohms
• Minimum Operating Temperature: - 40 C
• Amplifier Class: G
• No. Of Channels: 1
• Supply Voltage Range: 2.7V To 5.5V
• Load Impedance: 8ohm
• Operating Temperature Range: -40°C To +85°C
• Amplifier Case Style: TQFN
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX9730 Class G power amplifier with inverting
charge pump is the latest in linear amplifier technolo-
gy. The Class G output stage offers the performance
of a Class AB amplifier while increasing efficiency to
extend battery life. The integrated inverting charge
pump generates a negative supply capable of deliver-
ing up to 500mA.
The Class G output stage and the inverting charge pump
allow the MAX9730 to deliver an output power that is up
to four times greater than a traditional single-supply linear
amplifier. This allows the MAX9730 to maintain 0.8W into
an 8Ω load as the battery rail collapses.
The MAX9730 Class G amplifier is a linear amplifier that
operates within a low (V
SV
from the low to high supply range. For small signals,
the device operates within the lower (V
Figure 1. Class G Supply Transition
ON
SS
) supply range. Figure 1 illustrates the transition
2.4W, Single-Supply, Class G Power Amplifier
P
LOW SUPPLY RANGE OPERATION
I
P
Class G Operation and Efficiency
I
P
SV
V
R
= I
_______________________________________________________________________________________
CC
L
SS
N1
Detailed Description
CC
I
N1
to GND) and high (V
N1
N2
ON
OFF
CC
ON
to GND) sup-
P
BTL CLASS G SUPPLY TRANSITION
CC
I
P
SUPPLY TRANSITION
to
I
P
= I
SV
V
N1
R
CC
L
SS
+ I
ply range. In this range, the operation of the device is
identical to a traditional single-supply Class AB amplifi-
er where:
As the output signal increases, so a wider supply is
needed, the device begins its transition to the higher sup-
ply range (V
seamless transition between the low and high supply
ranges, both of the lower transistors are on so that:
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:
During operation, the output common-mode voltage of
the MAX9730 adjusts dynamically as the device transi-
tions between supply ranges.
N2
I
I
N1
N2
N1
N2
CC
ON
ON
to SV
ON
I
LOAD
SS
I
I
LOAD
) for the large signals. To ensure a
LOAD
P
= I
HIGH SUPPLY RANGE OPERATION
I
N1
P
= I
= I
N1
N2
+ I
N2
I
P
SV
V
R
= I
CC
L
SS
N2
I
N2
N1
N2
OFF
ON
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