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G1421 Datasheet

2W Stereo Audio Amplifier

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Global Mixed-mode Technology Inc.
G1421
2W Stereo Audio Amplifier with No Headphone
Coupling Capacitor Function
Features
„ Depop Circuitry Integrated
„ Output Power at 1% THD+N, VDD=5V
--1.8W/CH (typical) into a 4Ω Load
--1.2W/CH (typical) into a 8Ω Load
„ Eliminates Headphone Amplifier Output Cou-
pling Capacitors
„ Maximum Output Power Clamping Circuitry
www.DataSheet4U.cInomtegrated
„ Bridge-Tied Load (BTL), Single-Ended (SE),
and Stereo Headphone Amplifier (HP-IN) modes
Supported
„ Stereo Input MUX
„ Mute and Shutdown Control Available
„ Surface-Mount Power Package
24-Pin TSSOP-P
Applications
„ Stereo Power Amplifiers for Notebooks or
Desktop Computers
„ Multimedia Monitors
„ Stereo Power Amplifiers for Portable Audio
Systems
General Description
G1421 is a stereo audio power amplifier in 24pin
TSSOP thermal pad package. It can drive 1.8W con-
tinuous 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 design in the
notebook application, G1421 supports the Bridge-Tied
Load (BTL) mode for driving the speakers, Single-End
(SE) mode for driving the headphone. In the HP-IN
mode, it can support a DC value to the phone-jacket
and drive the headphone without the audio amplifier
outputs coupling capacitors. G1421 can mute the out-
put when Mute-In is activated. For the low current
consumption applications, the SHDN mode is sup-
ported to disable G1421 when it is idle. The current
consumption can be further reduced to below 5µA.
G1421 also supports two input paths, that means two
different gain loops can be set in the same PCB and
choosing either one by setting HP/ LINE pin. It en-
hances the hardware designing flexibility. G1421 also
supports an extra function -- the maximum output
power clamping function to protect the speakers or
headphones from burned-out.
Ordering Information
ORDER
NUMBER
G1421
Note: U: Tape & Reel
(FD): Thermal Pad
ORDER NUMBER
(Pb free)
G1421f
TEMP.
RANGE
-40°C to +85°C
PACKAGE
TSSOP-24 (FD)
Pin Configuration
G1421
GND/HS 1
TJ 2
LOUT+ 3
LLINEIN 4
LHPIN 5
LBYPASS 6
LVDD 7
SHUTDOWN 8
MUTE OUT 9
LOUT- 10
MUTE IN 11
GND/HS 12
Top View
TSSOP-24 (FD)
24 GND/HS
23 VOL
22 ROUT+
21 RLINEIN
20 RHPIN
19 RBYPASS
18 RVDD
17 HP-IN
16 HP/LINE
15 ROUT-
14 SE/BTL
13 GND/HS
Thermal
Pad
14
Bottom View
Ver: 1.6
Aug 04, 2005
Note: Recommend connecting the Thermal Pad to the GND for excellent power dissipation.
TEL: 886-3-5788833
http://www.gmt.com.tw
1
Global Mixed-mode Technology
Global Mixed-mode Technology



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