Features
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Fully differential amplifier
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Externally configurable gain
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Soft start function
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Low power shutdown mode
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Under voltage lockout
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Description The LM48555 is an audio power amplifier designed to drive ceramic speakers in applications such as cell phones, smart phones,
PDAs and other portable devices. The LM48555 produces 15.7VP-P with less than 1% THD+N while operating from a 3.2V power supply. The LM48555 features a low power shutdown mode, and differential
inputs for improved noise rejection.
The LM48555 includes advanced click and pop suppression that eliminates audible turn-on and turn-off transients. Additionally,
the integrated boost regulator features a soft start function that minimizes transient current during power-up
Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal number of external
components. The LM48555 does not require bootstrap capacitors, or snubber circuits.
The LM48555 is unity-gain stable and uses external gain-setting resistors.
Key Specification
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IDDQ (Boost Converter + Amplifier)
at VDD = 5V
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7.5mA (typ)
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Output Voltage Swing
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| VDD = 3.2V, THD
≤ 1%
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15.7VP-P (typ)
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Power Supply Rejection Ratio
f = 217Hz
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80dB (typ)
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Applications
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Mobile phones
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PDA's
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Digital cameras
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