LM4805

Features:

` Pop & click circuitry eliminates noise during turn-on and turn-off transitions
` Low, 2A (max) shutdown current
` Low, 14mA (typ) quiescent current
` Unity-gain stable
` External gain configuration capability




Application

·Cellphone
· PTT (Push To Talk) mobile phones




Specifications

Power@ 8Ohms, 1% THD	1.2 Watt
Power@ 8Ohms, 10% THD	1.65 Watt
THD	0.25 %
Supply Range	+2.7 - +5.5 V
THD Conditions	Vs = 5V, RL = 8 Ohms, Pout= 0.5W
User Supply	3.3 Volt
Shut down	Yes
Shutdown Type	Low
Temperature Min	-40 deg C
Temperature Max	85 deg C
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If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V_DD) 6.5V
Supply Voltage (V₁) 6.5V
Storage Temperature −65 to +150
Input Voltage−0.3V to VDD + 0.3V
Power Dissipation (Note 3) Internally limited
ESD Susceptibility (Note 4) 2000V
ESD Susceptibility (Note 5) 200V
Junction Temperature 125
Thermal Resistance
_JA (LLP) 59/W
See AN-1187 'Leadless Leadframe Packaging (LLP).'




Description

`The LM4805 is a boosted audio power amplifier designed for driving 8ohm speakers in portable applications. It delivers at least 1W continuous power to an 8 load from any input voltage between 3V and 4.6V with less than 2% THD+N.

`Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4805 does not require bootstrap capacitors, or snubber circuits. Therefore it is ideally suited for portable applications requiring high power and minimal size.

`The LM4805 features a low-power consumption shutdown mode along with an internal thermal shutdown protection mechanism and short circuit protection.

`The LM4805 contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4805 is unity-gain stable and can be configured by external gain-setting resistors.