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G1438 Datasheet

2W Stereo Audio Amplifier

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Global Mixed-mode Technology Inc.
G1438
2W Stereo Audio Amplifier with DC Volume
Control and Selectable Gain
Features
„ 0dB ~-78dB Internal DC Volume Gain Setting
Embedded
„ 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), Single-Ended (SE)
„ PC-Beep Input
„ Selectable Internal/External Gain Setting
„ Shutdown Control Available
„ Thermal Shutdown Protection
„ Surface-Mount Power Package
28-Pin TSSOP-P / 28pin TQFN Available
Applications
„ Stereo Power Amplifiers for Notebooks or
Desktop Computers
„ Multimedia Monitors
„ Stereo Power Amplifiers for Portable Audio
Systems
Ordering Information
ORDER
NUMBER
G1438F4U
G1438R6U
Note: F4: TSSOP-28 (FD)
U: Tape & Reel
MARKING
G1438
1438
R6 : TQFN5X5-28
Pin Configuration
General Description
The G1438 is a stereo audio power amplifier in both
28pin TSSOP and TQFN thermal pad package. It can
deliver 2.0W 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, G1438 supports the
Bridge-Tied Load (BTL) mode for driving the speakers,
Single-End (SE) mode for driving the headphone. For
the low current consumption applications, the Shut-
down mode is supported to disable the G1438 when it
is idle. The current consumption can be reduced below
2µA.
The internal DC volume gain setting is ranged from
0dB to -78dB. We can activate the internal DC volume
control by setting the Mode pin high, and setting the
Vol value to get the expected DC volume gain.
The G1438 is with the flexible for the user to select the
internal embedded gain setting or external gains
through the gain_sel pin. Setting the gain_sel pin low
is to activate the internal gain settings, setting high for
external gains.
TEMP.
RANGE
-40°C to +85°C
-40°C to +85°C
PACKAGE
(Pb free)
TSSOP-28 (FD)
TQFN5X5-28
G1438
GND/HS 1
Shutdown 2
Gain Select 3
Mode 4
Mute 5
VDD 6
DC Vol 7
GND 8
Right Dock 9
Right In 10
Beep In 11
Left In 12
Left Dock 13
GND/HS 14
28 Right Out+
27 VDD
26 Right Out-
25 Right Gain2
24 Right Gain1
23 GND/HS
22 Bypass
21 HP Sense
20 GND/HS
19 Left Gain1
18 Left Gain2
17 Left Out-
16 VDD
15 Left Out+
Top View
TSSOP-28 (FD)
Thermal
Pad
Bottom View
Left Gain1 22
GND/HS
HP Sense
Bypass
GND/HS
23
24
25
26
Right Gain1 27
Right Gain2 28
Thermal
Pad
14 Beep In
13 Right In
12 Right Dock
11 GND
10 DC Vol
9 VDD
8 Mute
G1438 TQFN5X5-28
Note: Recommend connecting the Thermal Pad to the GND for excellent power dissipation.
Ver: 1.1
Nov 12, 2008
TEL: 886-3-5788833
http://www.gmt.com.tw
1
Global Mixed-mode Technology
Global Mixed-mode Technology



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