SGM2821
3W Low EMI Class-D Audio Power Amplifier with Dual Mode of Automatic Level Control
The SGM2821 is a high efficiency, high-performance, Class-D audio power amplifier with dual mode of Automatic Level Control (ALC). It operates from 2.5V to 5.5V supply voltage. When powered with 5V supply voltage, it is capable of delivering a continuous average output of 2.4W into 4Ω load with 1% THD+N.
As a Class-D audio amplifier, the SGM2821 features up to 88% efficiency and 72dB PSRR at 217Hz which make the device ideal for battery-powered high-quality audio applications.
A key benefit of the SGM2821 over typical Class-D audio power amplifiers is that it generates much less EMI emissions, thus greatly simplifying the system design for portable applications. The device also includes the over-current and short-circuit protections with auto-recovery, which ensures the device can be operated safely and reliably without the need for system interaction.
Filterless Class-D Operation
High Efficiency up to 88%
Automatic Level Control to Eliminate Output Clipping
Output Power at 5V Supply (ALC-OFF)
3.0W (4Ω Load, 10% THD+N)
2.4W (4Ω Load, 1% THD+N)
1.7W (8Ω Load, 10% THD+N)
1.4W (8Ω Load, 1% THD+N)
Low THD+N: 0.05% (VDD = 3.6V, f = 1kHz, RL = 8Ω, PO = 0.5W)
ALC Range: 13dB
Low Quiescent Current: 2.6mA at VDD = 3.6V
Low Shutdown Current: 0.1μA (TYP)
High PSRR: 72dB at 217Hz
No Bypass Capacitor Required for the Common-Mode Bias
Under-Voltage Lockout
Auto-Recovering Over-Current and Short-Circuit Protections
Thermal Overload Protection
Low EMI Design
Available in a Green UTQFN-1.5×1.5-9L Package
Mobile Phones
Portable Navigation Devices
Multimedia Internet Devices
Portable Speakers
