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Features
Fully differential amplification
Internal-gain-setting resistors
Available in space-saving packages micro SMD, MSOP and LLP
Ultra low current shutdown mode
Can drive capacitive loads up to 500 pF
Improved pop & click circuitry eliminates noises during turn-on and turn-off transitions
2.2 - 5.5V operation
No output coupling capacitors, snubber networks or bootstrap capacitors required
Shutdown high or low selectivity
Description The LM4895 is a fully differential audio power amplifier primarily designed for demanding applications in mobile phones and
other portable communication device applications. It is capable of delivering 1 watt of continuous average power to an 8Ω
load with less than 1% distortion (THD+N) from a 5VDC power supply.
Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external
components. The LM4895 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited
for mobile phone and other low voltage applications where minimal power consumption is a primary requirement.
The LM4895 features a low-power consumption shutdown mode. To facilitate this, Shutdown may be enabled by either logic high
or low depending on mode selection. Driving the shutdown mode pin either high or low enables the shutdown select pin to be
driven in a likewise manner to enable Shutdown. Additionally, the LM4895 features an internal thermal shutdown protection
mechanism.
The LM4895 contains advanced pop & click circuitry which eliminates noises which would otherwise occur during turn-on and
turn-off transitions.
The LM4895 has an internally fixed gain of 6dB.
Key Specification
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Improved PSRR at 217Hz
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80dB
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Power Output at 5.0V & 1% THD
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1.0W(typ.)
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Power Output at 3.3V & 1% THD
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400mW(typ.)
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Shutdown Current
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0.1µA(typ.)
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Applications
Mobile phones
PDAs
Portable electronic devices
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