Part of National’s PowerWise family or products, the LM48512 delivers 1.8W into 8Ω, while consuming 14.5mA of quiescent current.
The LM48512 also features National’s Enhanced Emissions Suppression (E
2S) system, a patented, ultra low EMI PWM architecture that significantly reduces RF emissions while preserving audio quality
and efficiency. LM48512 improves battery life, reduces external component count, board area consumption, system cost, and
The LM48512 is designed to meet the demands of portable multimedia devices. The LM48512 features high efficiency compared
to other boosted amplifiers and low EMI Class D amplifiers. The LM48512 is capable of driving an 8Ω speaker to 5.5V levels
(1.8W) from a 3.6V supply while operating at 82% efficiency. Flexible power supply requirements allow operation from 2.3V
to 5.5V. The E
2S system features a patented edge rate control (ERC) architecture that further reduces emissions by minimizing the high frequency
component of the device output, while maintaining high quality audio reproduction (THD+N = 0.03%) and high efficiency. A
low power shutdown mode reduces supply current consumption to 0.04μA.
The LM48512 features a battery-saving automatic gain control (AGC). The AGC detects the battery voltage and reduces the gain
of the amplifier to limit the output as the battery voltage decreases.
Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.
Power Output at VDD = 3.6V
RL = 8Ω, THD+N
Efficiency at 3.6V, 800mW into 8Ω
Quiescent Power Supply Current