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IT4990 －
1.37 Watt Low Noise Audio Power Amplifier
Description
The IT4990 is an audio power amplifier designed for portable
communication device applications such as mobile phone applications.
The IT4990 is capable of delivering 1.37W of continuous average power
to an 8Ω BTL load and with less than 1% distortion (THD+N) from a 5V
power supply, and 470mW to a 8Ω BTL load from a 3V power supply. The
IT4990 provides high quality output power while requiring few external
components and minimal power consumption. It features a low-power
shutdown mode, which is achieved by driving the SHDNB pin with logic
low. For maximum flexibility, the IT4990 provides an externally
controlled gain (with resistors), as well as an externally controlled
turn-on time (with the bypass capacitor). The IT4990 is available in a
1.4mm×1.4mm WCSP package.
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Features
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2.3V -5.5V
operation range
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Output
power
1.37 W into
8Ω at 5V Supply at THD=1% (Typ.)
470 mW into
8Ω at 3V Supply at THD=1% (Typ.)
340 mW into
8Ω at 2.6V Supply at THD=1% (Typ.)
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Low
quiescent current
2.5mA
Typical at VDD=5V
Shutdown
current < 0.1uA
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High
signal-to-noise ratio performance
Po=1W,
f=1KHz, SNR=101 dB (A-weighting) at VDD=5V
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Ultra low
noise (12u Vrms, A-weighting) and output offset voltage
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Thermal
shutdown protection
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No output
coupling capacitors, snubber networks or bootstrap capacitors required
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Unity-gain
stable
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External
gain configuration capability
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Technology
Information:
 Data Sheet
Package:
WCSP-9
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