LM4671
www.ti.com SNAS258D – MARCH 2005 – REVISED MAY 2013 LM4671 Filterless High Efficiency 2.5W Switching Audio
Amplifier
Check for Samples: LM4671 FEATURES DESCRIPTION The LM4671 is a single supply, high efficiency 2.5W
switching audio amplifier. A low noise, filterless PWM
architecture eliminates the output filter, reducing
external component count, board area consumption,
system cost, and simplifying design. 1 2 No Output Filter Required for Inductive Loads
Externally Configurable Gain
Very Fast Turn On Time: 17Ојs (typ)
Minimum External Components
"Click and pop" Suppression Circuitry
Micro-Power Shutdown Mode
Available in Space-Saving DSBGA Package APPLICATIONS Mobile Phones
PDAs
Portable Electronic Devices KEY SPECIFICATIONS Efficiency @ 3.6V, 100mW into 8Ω Speaker:
80 % (typ)
Efficiency @ 3.6V, 400mW into 8Ω Speaker:
88 % (typ)
Efficiency @ 5V, 1W into 8Ω Speaker: 86 %
(typ)
Quiescent Current, 3.6V Supply: 2.8 mA (typ)
Total Shutdown Power Supply Current: 0.01 …
