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Global Mixed-mode Technology Inc.
2W Stereo Audio Amplifier
G1431
Features
„ Internal Gain Control, Which Eliminates Exter-
nal Gain-Setting Resistors
„ Depop Circuitry Integrated
„ Output Power at 1% THD+N, VDD=5V
--2.0W/CH (typical) into a 4Ω Load
--1.2W/CH (typical) into a 8Ω Load
„ Bridge-Tied Load (BTL) Supported
„ Fully differential Input
„ Shutdown Control Available
www.DataSheet„4U.cSoumrface-Mount Power Package
20-Pin TSSOP-P & 20-Pin TQFN 4X4
Applications
„ Stereo Power Amplifiers for Notebooks or
Desktop Computers
„ Multimedia Monitors
„ Stereo Power Amplifiers for Portable Audio
Systems
Pin Configuration
General Description
G1431 is a stereo audio power amplifier in 20pin
TSSOP thermal pad package or 20-pin TQFN 4X4. It
can drive 2W continuous RMS power into 4Ω load per
channel in Bridge-Tied Load (BTL) mode at 5V supply
voltage. Its THD is smaller than 1% under the above
operation condition. To simplify the audio system de-
sign in the notebook application and to enlarge the
driving power, G1431 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 G1431 when it is idle. The current
consumption can be reduced to 150µA (typically).
Amplifier gain is internally configured and controlled by
two terminals (GAIN0, GAIN1). BTL gain settings of
6dB, 10dB, 15.6dB, 21.6dB are provided.
Ordering Information
ORDER
NUMBER
MARKING
TEMP.
RANGE
PACKAGE
(Pb free)
G1431F2U G1431 -40°C to +85°C TSSOP-20 (FD)
G1431R9U 1431 -40°C to +85°C TQFN4X4-20
Note: F2: TSSOP-20 (FD) R9:TQFN4X4-20
U: Tape & Reel
SHUTDOWN 16
GND 17
GND 18
GAIN0 19
GAIN1 20
Thermal
Pad
10 NC
9 GND
8 GND
7 BYPASS
6 LIN+
G1431 TQFN4X4-20
GND 1
GAIN0 2
GAIN1 3
LOUT+ 4
LIN- 5
PVDD 6
RIN+ 7
LOUT- 8
LIN+ 9
BYPASS 10
G1431
Thermal
Pad
Top View
TSSOP-20 (FD)
20 GND
19 SHUTDOWN
18 ROUT+
17 RIN-
16 VDD
15 PVDD
14 ROUT-
13 GND
12 NC
11 GND
Ver: 1.5
Oct 25, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
1

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Global Mixed-mode Technology Inc.
G1431
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
Reflow Temperature (soldering, 10sec) . . . . . . . .260°C
Power Dissipation (1)
TA 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7W
TA 70°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.7W
Electrostatic Discharge, VESD
Human body mode . . . . . . . . . . . . . . . . . . . . . 3000V(2)
Note:
(1) : Recommended PCB Layout
(2) : Human body model : C = 100pF, R = 1500Ω, 3 positive pulses plus 3 negative pulses
www.DataSheetE4Ul.ecocmtrical Characteristics
DC Electrical Characteristics, TA=+25°C
PARAMETER
Supply voltage VDD
High-Level Input voltage, VIH
Low-Level Input voltage, VIL
DC Differential Output Voltage
Supply Current in Mute Mode
IDD in Shutdown
SYMBOL
CONDITIONS
VDD
VIH SHUTDOWN , GAIN0, GAIN1
VIL SHUTDOWN , GAIN0, GAIN1
VO(DIFF) VDD = 5V,Gain = 2
IDD VDD = 5V Stereo BTL
ISD VDD = 5V
MIN
4.5
2
---
---
---
---
TYP
5
---
---
5
7.5
160
MAX
5.5
---
0.8
50
11
300
UNIT
V
V
V
mV
mA
µA
(AC Operation Characteristics, VDD = 5.0V, TA=+25°C, RL = 4Ω, unless otherwise noted)
PARAMETER
SYMBOL
CONDITIONS
Output power (each channel) see Note
Total harmonic distortion plus noise
Maximum output power bandwidth
P(OUT)
THD+N
BOM
THD = 1%, BTL, RL = 4Ω G=-2V/V
THD = 1%, BTL, RL = 8Ω G=-2V/V
THD = 10%, BTL, RL = 4Ω G=-2V/V
THD = 10%, BTL, RL = 8Ω G=-2V/V
PO = 1.6W, BTL, RL = 4Ω G=-2V/V
PO = 1W, BTL, RL = 8Ω G=-2V/V
THD = 5%
Power supply ripple rejection
Channel-to-channel output separation
PSRR
F=1kHz, BTL mode G=-2V/V
CBYP=1µF
f = 1kHz
Input impedance
ZI
Signal-to-noise ratio
Output noise voltage
PO = 500mW, BTL, G=-2V/V
Vn BTL,G=-2V/V, A Weighted filter
Note :Output power is measured at the output terminals of the IC at 1kHz.
MIN
---
---
---
---
---
---
---
---
TYP
2
1.2
2.5
1.6
100
60
15
68
MAX
---
---
---
---
---
---
---
---
UNIT
W
m%
kHz
dB
--- 80 ---
See Table 2
--- 90 ---
--- 45 ---
dB
MΩ
dB
µV (rms)
Ver: 1.5
Oct 25, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
2

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Global Mixed-mode Technology Inc.
Typical Characteristics
Table of Graphs
THD +N Total harmonic distortion plus noise vs Frequency
vs Output Power
Vn Output noise voltage
vs Frequency
Supply ripple rejection ratio
vs Frequency
Crosstalk
vs Frequency
PO Output power
vs Load Resistance
PD Power dissipation
vs Output Power
FIGURE
1,2,7,8,13,14
3,4,5,6,9,10,11,12,15,16,17,18
21
19
20
22
23
G1431
www.DataSheet4U.com
Total Harmonic Distortion
Plus Noise vs Frequency
10
5 VDD=5V
RL=3Ω
2 Po=1.75W
Av=21.6dB
1
0.5
%
0.2
Av=15.6dB
0.1
0.05
Av=6dB
0.02
Av=10dB
0.01
20
50 100 200
500
Hz
1k
2k
Figure 1
5k 10k 20k
Total Harmonic Distortion Plus
Noise vs Output Power
10
5 VDD=5V
RL=3Ω, Av=6dB
2
1 15kHz
0.5
%
0.2
1kHz
0.1
0.05
20Hz
0.02
0.01
3m 5m
10m 20m
50m 100m 200m
W
Figure 3
500m
1
23
Total Harmonic Distortion
Plus Noise vs Frequency
10
5 VDD=5V
RL=3Ω
2 Av=6dB
1
0.5
%
0.2
0.1
Po=1W
Po=0.5W
0.05
0.02 Po=1.5W
0.01
20
50 100 200
500
Hz
1k
2k
Figure 2
5k 10k 20k
10
5
2
1
0.5
%
0.2
0.1
0.05
Total Harmonic Distortion Plus
Noise vs Output Power
15kHz
VDD=5V
RL=3Ω, Av=10dB
1kHz
20Hz
0.02
0.01
3m 5m
10m 20m
50m 100m 200m
W
Figure 4
500m
1
23
Ver: 1.5
Oct 25, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
3