MAX9779ETI+ Maxim Integrated Products, MAX9779ETI+ Datasheet - Page 16

• Manufacturer Part Number: MAX9779ETI+
• Description: IC AMP AUDIO PWR 2.6W AB 28TQFN
• Manufacturer: Maxim Integrated Products
• Series: DirectDrive™r
• Type: Class ABr

Specifications of MAX9779ETI+

• Output Type: 2-Channel (Stereo) with Stereo Headphones
• Max Output Power X Channels @ Load: 2.6W x 2 @ 3 Ohm; 110mW x 2 @ 16 Ohm
• Voltage - Supply: 4.5 V ~ 5.5 V
• Features: Depop, Short-Circuit and Thermal Protection, Shutdown
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.6W Stereo Audio Power Amplifier and
DirectDrive Headphone Amplifier
For example, when compared to a 0Ω trace, a 100mΩ
trace reduces the power delivered to a 4Ω load from
2.1W to 2W. Large output, supply, and GND traces also
improve the power dissipation of the device.
16
______________________________________________________________________________________
3V TO 5.5V
RIGHT-CHANNEL
C
LEFT-CHANNEL
1µF
BIAS
AUDIO INPUT
AUDIO INPUT
1µF
1µF
V
V
V
C1
1µF
1µF
DD
DD
DD
C
C
CPGND
IN
IN
CPV
GAIN1
GAIN2
SHDN
BIAS
GND
N.C.
C1N
C1P
INL
INR
DD
1
27
21
28
24
23
2
22
7
8
10
9
HEADPHONE
SHUTDOWN
DETECTION
CPV
CONTROL
CONTROL
CONTROL
GAIN
CHARGE
PUMP
MAX9779
GAIN/
GAIN/
11
SS
0.1µF
C2
1µF
12
V
SS
4.5V TO 5.5V
25
26
V
DD
GND
The MAX9779 thin QFN package features an exposed
thermal pad on its underside. This pad lowers the
package’s thermal resistance by providing a direct
heat-conduction path from the die to the PC board.
Connect the exposed thermal pad to GND by using a
large pad and multiple vias to the GND plane.
3, 19
AMPLIFIER
AMPLIFIER
PGND
BTL
BTL
6, 16
18
17
15
20
14
13
4
5
PV
OUTL+
OUTL-
OUTR+
OUTR-
HPV
HPS
HPOUTL
HPOUTR
DD
DD
0.1µF
10µF
Block Diagram
4.5V TO 5.5V
3V TO 5.5V