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Features
Available in space-saving packages: LLP, micro SMD, MSOP, and SOIC
Ultra low current shutdown mode
BTL output can drive capacitive loads up to 500pF
Improved pop & click circuitry eliminates noise during turn-on and turn-off transitions
2.2 - 5.5V operation
No output coupling capacitors, snubber networks or bootstrap capacitors required
Thermal shutdown protection
Unity-gain stable
External gain configuration capability
Headphone amplifier mode
Description The LM4892 is an 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 BTL load with less
than 1% distortion (THD+N) from a 5VDC power supply. Switching between bridged speaker mode and headphone (single-ended) mode is accomplished using the headphone
sense pin.
Boomer audio power amplifiers are designed specifically to provide high quality output power with a minimal amount of external
components. The LM4892 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 LM4892 features a low-power consumption shutdown mode, which is achieved by driving the shutdown pin with logic low.
Additionally, the LM4892 features an internal thermal shutdown protection mechanism.
The LM4892 contains advanced pop & click circuitry which eliminates noise which would otherwise occur during turn-on and turn-off
transitions.
The LM4892 is unity-gain stable and can be configured by external gain-setting resistors.
Key Specification
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PSRR at 217Hz, VDD = 5V, 8Ω Load
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62dB (typ)
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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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