SGM4891 Datasheet, PDF (1/11 Pages) SG Micro Corp – 1.2W Audio Power Amplifier

SGM4891
1.2W Audio Power Amplifier
GENERAL DESCRIPTION
The SGM4891 is a 1.2W, 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. SGM4891 is capable of
delivering 1.2W of continuous output power with typically
1% distortion (THD+N) when it drives an 8Ω speaker
from a 5.0V power supply.
The SGM4891 features a low power consumption
shutdown mode, which is achieved by driving the
shutdown pin with a logic low. Additionally, the SGM4891
features an internal thermal shutdown protection
mechanism.
The SGM4891 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.
For maximum flexibility, the SGM4891 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
145ms wake-up time when V₊ is equal to 5.0V.
FEATURES
 Ideal for Notebook Computers, PDAs, and
Other Small Portable Audio Devices
 1.2W into 8Ω BTL Load from 5V Supply at
THD+N = 1% (TYP)
 Excellent PSRR: Direct Connection to Battery
 Fast Turn-On Time
 Unity Gain Stable
 2.5V to 5.5V Operation
 Shutdown Current: 0.02μA (TYP)
 Shutdown Pin is Compatible with 1.8V Logic
 -40℃ to +85℃ Operating Temperature Range
 Available in Green TDFN-2×2-8L Package
APPLICATIONS
Portable Systems
MP3 Players
Mobile Phone
PDAs
GPS
The SGM4891 is available in Green TDFN-2×2-8L
package. It operates over an ambient temperature range
of -40℃ to +85℃.
SG Micro Corp
www.sg-micro.com
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