Global Mixed-mode Technology Inc.
G1431
2W Stereo Audio Amplifier
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
Surface-Mount Power Package
20-Pin TSSOP-P & 20-Pin TQFN 4X4
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.
Applications
Stereo Power Amplifiers for Notebooks or
Desktop Computers
Multimedia Monitors
Stereo Power Amplifiers for Portable Audio
Systems
Ordering Information
ORDER
MARKING
NUMBER
G1431F2U
G1431R9U
G1431
1431
TEMP.
RANGE
PACKAGE
(Pb free)
-40°C to +85°C TSSOP-20 (FD)
-40°C to +85°C TQFN4X4-20
R9:TQFN4X4-20
Note: F2: TSSOP-20 (FD)
U: Tape & Reel
Pin Configuration
ROUT+
ROUT-
PVDD
RIN-
VDD
G1431
GND
GAIN0
GAIN1
10
9
NC
GND
GND
BYPASS
LIN+
LOUT+
LIN-
PVDD
RIN+
LOUT-
LIN+
1
2
3
4
5
6
7
8
9
20
19
18
17
GND
SHUTDOWN
ROUT+
RIN-
VDD
PVDD
ROUT-
GND
NC
GND
13
14
12
SHUTDOWN
GND
GND
GAIN0
GAIN1
16
17
18
19
20
1
2
3
4
5
Thermal
Pad
15
11
8
7
6
Thermal
Pad
16
15
14
13
12
11
BYPASS 10
LOUT+
LOUT-
RIN+
LIN-
Top View
TSSOP-20 (FD)
G1431 TQFN4X4-20
PVDD
Ver: 1.5
Oct 25, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
1
GMT [ GLOBAL MIXED-MODE TECHNOLOGY INC ]
