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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
„ Surface-Mount Power Package
„ Over-Temperature Protection Embedded
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
(Green)
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: 1.8
Dec 22, 2008
TEL: 886-3-5788833
http://www.gmt.com.tw
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