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 less than 1% distortion (THD) 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.
The SGM4891 is available in Green TDFN-2×2-8L package. It operates over an ambient temperature range of -40°C to +85°C.
Ideal for Notebook Computers, PDAs, and Other Small Portable Audio Devices
1.2W to 8Ω BTL Load from 5V Supply at THD + N = 1% (Typical)
Excellent PSRR: Direct Connection to the Battery
Fast Turn On Time
Unity Gain Stable
2.5V to 5.5V Operation
Shutdown Current: 0.02μA Typical
Shutdown Pin is Compatible with 1.8V Logic
-40°C to +85°C Operating Temperature Range
Available in Green TDFN-2×2-8L Package