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Global Mixed-mode Technology Inc.
2.2W Stereo Audio Amplifier
G1426
Features
„Depop Circuitry Integrated
„Output Power at 10% THD+N, VDD=5V
--2.2W/CH (typical) into a 4Load
„Output Power at 1% THD+N, VDD=5V
--2W/CH (typical) into a 4Load
--1.2W/CH (typical) into a 8Load
„Bridge-Tied Load (BTL)
„Shutdown Control Available
„Thermal protection
www.DataSheet„4U.cSoumrface-Mount Power Package
20-Pin TSSOP-P
General Description
The G1426 is a stereo audio power amplifier in 20pin
TSSOP package. It can deliver 2W continuous RMS
power into 4load per channel in Bridge-Tied Load
(BTL) mode at 5V supply voltage under 1% THD. To
simplify the audio system design in the notebook ap-
plication, The G1426 supports the Bridge-Tied Load
(BTL) mode for driving the speakers. For the low cur-
rent consumption applications, the SHDN mode is
supported to disable the G1426 when it is idle. The
current consumption can be further reduced to below
2µA.
Applications
„Stereo Power Amplifiers for Notebooks or
Desktop Computers
„Multimedia Monitors
„Stereo Power Amplifiers for Portable Audio
Systems
Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
G1426D5X G1426 -40°C to +85°C TSSOP-20L
G1426F2X G1426 -40°C to +85°C TSSOP-20L (FD)
Note: X Specify the packing type
U: Tape & Reel
T: Tube
* TSSOP-20L (FD): Thermal Pad
Pin Configuration
SHUTDOWN 1
GND/HS 2
+OUTA 3
VDD 4
-OUTA 5
-INA 6
GND/HS 7
+INA 8
NC 9
GND/HS 10
G1426
Top View
20Pin TSSOP
20 GND/HS
19 GND/HS
18 +OUTB
17 VDD
16 -OUTB
15 -INB
14 BYPASS
13 +INB
12 NC
11 NC
Ver: 1.0
Dec 04, 2003
1
Thermal
Pad
Bottom View
TEL: 886-3-5788833
http://www.gmt.com.tw

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Global Mixed-mode Technology Inc.
G1426
Absolute Maximum Ratings
Supply Voltage, VCC…………………..…...…….……...6V
Operating Ambient Temperature Range
TA…….…………………………….……….-40°C to +85°C
Maximum Junction Temperature, TJ…..……….….150°C
Storage Temperature Range, TSTG….….-65°C to+150°C
Soldering Temperature, 10seconds, TS……….……260°C
Power Dissipation (1)
TA 25°C………………………………………….2.7W
TA 70°C………………………………………….1.7W
TA 85°C………………….………………………1.4W
Electrostatic Discharge, VESD
Human body mode..…………………….-3000 to 3000(2)
Note:
(1) : Recommended PCB Layout
(2) : Human body model : C = 100pF, R = 1500, 3 positive pulses plus 3 negative pulses
www.DataSheetE4Ul.ecocmtrical Characteristics
DC Electrical Characteristics, VDD = 5.0V, TA=+25°C, unless otherwise noted
PARAMETER
Supply Current
DC Differential Output Voltage
IDD in Shutdown
SYMBOL
IDD
VO(DIFF)
ISD
CONDITION
VDD = 5V
VDD = 5V,Gain = 2
VDD = 5V
MIN
-
-
-
TYP
8.5
5
0.1
MAX
15
50
2
UNIT
mA
mV
µA
(AC Operation Characteristics, VDD = 5.0V, TA=+25°C, RL = 4, unless otherwise noted)
PARAMETER
SYMBOL
CONDITION
Output power (each channel) see Note
Total harmonic distortion plus noise
P(OUT)
THD+N
THD = 1%, BTL, RL = 4
THD = 1%, BTL, RL = 8
THD = 10%, BTL, RL = 4
THD = 10%, BTL, RL = 8
PO = 1.6W, BTL, RL = 4
PO = 1W, BTL, RL = 8
VI = 1V, RL = 10K, G = 1
Maximum output power bandwidth
BOM G = 10, THD = 1%
Phase margin
RL = 4, Open Load
Power supply ripple rejection
PSRR f = 120Hz
Channel-to-channel output separation
f = 1kHz
Input impedance
ZI
Signal-to-noise ratio
Output noise voltage
PO = 500mW, BTL
Vn Output noise voltage
Note :Output power is measured at the output terminals of the IC at 1kHz.
MIN
-
-
-
-
-
-
-
-
-
-
-
-
-
-
TYP
2
1.25
2.5
1.6
300
100
10
20
65
75
80
2
90
55
MAX UNIT
-
-
-
W
-
-
- m%
-
- kHz
-°
- dB
- dB
- M
- dB
- µV (rms)
Ver: 1.0
Dec 04, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
2

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Global Mixed-mode Technology Inc.
Pin Description
G1426
PIN NAME
1 SHUTDOWN
2,7,10,19,20
3
4,17
5
6
8
www.DataSheet4U.co9m
11
12
13
14
15
16
18
GND/HS
+OUTA
VDD
-OUTA
-INA
+INA
NC
NC
NC
+INB
BYPASS
-INB
-OUTB
+OUTB
I/O FUNCTION
I Shutdown mode control signal input, places entire IC in shutdown mode when held
high, IDD is below 2µA.
Ground connection for circuitry, directly connected to thermal pad.
O A channel + output
Supply voltage for circuitry.
O A channel - output
I A channel input signal
I A channel positive input of OPAMP, biasing DC operation of OPAMP
I NC
I NC
NC
I B channel positive input of OPAMP, biasing DC operation of OPAMP
Connect to voltage divider for internal mid-supply bias.
I B channel input signal
O B channel - output
O B channel + output
Ver: 1.0
Dec 04, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
3

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Global Mixed-mode Technology Inc.
Typical Characteristics
Table of Graphs
vs Frequency
THD +N Total harmonic distortion plus noise
vs Output power
Vn Output noise voltage
Supply ripple rejection ratio
vs Frequency
vs Frequency
Crosstalk
vs Frequency
Closed loop response
vs Frequency
www.DataShIeDDet4SUu.cpopmly current
PO Output power
vs supply voltage
vs supply voltage
vs Load resistance
PD Power dissipation
vs Output power
2,4,6,9,11
1,3,5,7,8,10
13
12
14
17
15
16
18
19,20
G1426
FIGURE
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS NOISE
vs FREQUENCY
10
5
2
1
0.5
%
0.2
0.1
0.05
1kHz
20Hz
0.02
0.01
3m 5m
10m 20m
20kHz
50m 100m 200m
W
Figure 1
VDD=5V
RL=3Ω
BTL
Av=-2V/V
500m
1
23
10
5
2
1
0.5
%
0.2
0.1
0.05
0.02
0.01
20
Po=1.8W
VDD=5V
RL=3Ω
BTL
Av=-2V/V
50 100 200
500 1k
2k
Hz
Figure 2
5k 10k 20k
Ver: 1.0
Dec 04, 2003
TEL: 886-3-5788833
4 http://www.gmt.com.tw

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Global Mixed-mode Technology Inc.
G1426
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS NOISE
vs FREQUENCY
10
5
www.DataSheet4U.com
2
1
0.5
%
0.2
0.1
0.05
1kHz
20Hz
0.02
0.01
3m 5m
10m 20m
20kHz
50m 100m 200m
W
Figure 3
VDD=5V
RL=4Ω
BTL
Av=-2V/V
500m
1
23
10
5
2
1
0.5
%
0.2
0.1
0.05
0.02
0.01
20
Av=-2V/V
Av=-4V/V
Av=-1V/V
VDD=5V
RL=4Ω
BTL
Po=2W
50 100 200
500 1k
2k
Hz
Figure 4
5k 10k 20k
TOTAL HARMONIC DISTORTION PLUS NOISE
vs OUTPUT POWER
TOTAL HARMONIC DISTORTION PLUS NOISE
vs FREQUENCY
10
5
2
1
0.5
%
0.2
0.1
0.05
0.02
0.01
2m
20kHz
1kHz
20Hz
VDD=5V
RL=8Ω
BTL
Av=-2V/V
5m 10m 20m
50m 100m
W
200m
Figure 5
500m
1
2
10
5
2
1
0.5
%
0.2
VDD=5V
RL=8Ω
BTL
Po=1W
Av=-2V/V
Av=-4V/V
0.1
0.05
0.02 Av=-1V/V
0.01
20
50 100 200
500
Hz
1k
2k
Figure 6
5k 10k 20k
Ver: 1.0
Dec 04, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
5