SNAS042C – JANUARY 2002 – REVISED MAY 2013
750 mW Audio Power Amplifier with DC Volume
Control and Headphone Switch
Check for Samples: LM4875
•2 Precision DC Voltage Volume Control
• Headphone Amplifier Mode
• “Click and Pop” Suppression
• Shutdown Control When Volume Control Pin Is
• Thermal Shutdown Protection
• GSM Phones and Accessories, DECT, Office
• Hand Held Radio
• Other Portable Audio Devices
• 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
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.
Small Outline Package (SOIC)
Mini Small Outline Package (VSSOP)
See Package Number D, DGK
Figure 1. Typical Audio Amplifier Application
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PRODUCTION DATA information is current as of publication date.
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