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Features
Advanced "click and pop" suppression circuitry
Stereo headphone amplifier mode
Low current micro-power shutdown mode
Thermal shutdown protection circuitry
2.5V to 5.5V operation
Unity-gain stable
Gain set with external resistors
Space-saving exposed-DAP TSSOP package
Description The unity-gain stable LM4913 is both a mono differential output (for bridge-tied loads, or BTL) audio power amplifier and
a single-ended (SE) stereo headphone amplifier. Operating on a single 5V supply, the mono BTL mode delivers 2W (typ) to a
4Ω load (Note 1) at 0.3% THD+N. In SE stereo mode, the amplifier will deliver 90mW to 32Ω loads. The LM4913 features circuitry
that suppresses output transients ("clicks and pops").
The LM4913 is designed for notebook and other handheld portable applications. It delivers high quality output power from a
surface-mount package and requires few external components. The LM4913 is pin and functionally compatible with the TPA0213.
Other features include an active-low micro-power shutdown mode and thermal shutdown protection.
The LM4913 is available in a space efficient 10-lead exposed-DAP TSSOP package.
When operating on a 5VDC supply, an LM4913MH that has been properly mounted to a circuit board will deliver 2W into 4Ω. See the Application Information
sections for further information concerning PCB layout suggestions to maximize the LM4913MH's output power with a 4Ω load.
Key Specification
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BTL output power (RL = 4Ω)
VDD = at 3.0V, THD = 1%
VDD = at 5.0V, THD = 0.3%
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660mW (typ)
2W (typ)
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SE output power (RL = 32Ω and THD = 0.1%)
VDD = at 3.0V
VDD = at 5.0V
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33mW (typ)
90mW (typ)
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Micro-power shutdown supply current
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1µA (typ)
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PSRR (@ 1kHz, 2.9V
≤ VDD
≤ 5.1V, (Fig. 1))
BTL
SE
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52dB (typ)
62dB (typ)
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Applications
PDAs
Cellular phones
Handheld portable electronic devices
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