1.1 Watt Audio Power Amplifier
SGM4890
GENERAL DESCRIPTION
FEATURES
• Ideal for Notebook Computers, PDAs, and
Other Small Portable Audio Devices
• 1.1W to 8-Ω BTL Load from 5V Supply at
THD =1% (Typical)
• Excellent PSRR: Direct Connection to the Battery
• Fast Turn On Time
• Unity Gain Stable
• 2.5V to 5.5V Operation
• Shutdown Current: 0.01µA Typical
• Shutdown Pin is Compatible with 1.8V Logic
• –40℃ to +85℃ Operating Temperature Range
• Small Packaging
The SGM4890 is a 1.1-W, fully integrated, audio power
amplifier. It is designed to maximize audio performance
in portable applications such as mobile phone. The
portable application requires audio power amplifier has
minimum of external components and can operate from
a single 2.5V to 5.5V power supply. SGM4890 is capable
of delivering 1.1W of continuous output power with less
than 1% distortion（THD + N）when it drives an 8Ω
speaker from a 5.0V power supply.
The SGM4890 features
a low-power consumption
shutdown mode, which is achieved by driving the
shutdown pin with a logic low. Additionally, the
SGM4890 features an internal thermal shutdown
protection mechanism.
The SGM4890 does not require output coupling
capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage
applications where minimal power consumption is a
primary requirement.
PIN CONFIGURATIONS (Top View)
-IN
VO1
GND
VO2
+IN
V+
A
B
C
For maximum flexibility, the SGM4890 provides an
externally controlled gain (with resistors), as well as an
externally controlled turn-on time (with the bypass
capacitor). When using a 1µF bypass capacitor, it offers
110ms wake up time when V+ is equal to 5.0V.
GND
Bypass
SHDN
The SGM4890 is available in CSP-9 and MSOP-8
packages. It operates over an ambient temperature range
of –40℃ to +85℃.
1
2
3
CSP-9
APPLICATIONS
Portable Systems
MP3 Players
Mobile Phone
PDAs
VO2
SHDN
Bypass
+IN
8
1
2
3
GND
7
6
V+
GPS
VO1
5
-IN
4
MSOP-8
SG Microelectronics Co, Ltd
Tel: 86/10/51798160/80
www.sg-micro.com
REV. A
SGMICRO [ Shengbang Microelectronics Co, Ltd ]
