1FEATURES
2• Precision DC Voltage Volume Control
• Headphone Amplifier Mode
• “Click and Pop” Suppression
• Shutdown Control When Volume Control Pin Is
Low
• Thermal Shutdown Protection

APPLICATIONS
• GSM Phones and Accessories, DECT, Office
Phones
• Hand Held Radio
• Other Portable Audio Devices

KEY SPECIFICATIONS
• PO at 1.0% THD+N Into 8Ω; 750 mW (typ)
• PO at 10% THD+N Into 8Ω; 1 W (typ)
• Shutdown Current; 0.7μA(typ)
• Supply Voltage Range; 2.7V to 5.5 V

DESCRIPTION
The LM4875 is a mono bridged audio power amplifier
with DC voltage volume control. The LM4875 is
capable of delivering 750mW of continuous average
power into an 8Ω load with less than 1% THD when
powered by a 5V power supply. Switching between
bridged speaker mode and headphone (single ended)
mode is accomplished using the headphone sense
pin. To conserve power in portable applications, the
LM4875's micropower shutdown mode (IQ = 0.7μA,
typ) is activated when less than 300mV is applied to
the DC Vol/SD pin.
Boomer audio power amplifiers are designed
specifically to provide high power audio output while
maintaining high fidelity. They require few external
components and operate on low supply voltages.