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LM4805

National Semiconductor
Part Number LM4805
Manufacturer National Semiconductor
Description Low Voltage High Power Audio Power Amplifier
Published Apr 28, 2010
Detailed Description August 2005 www.DataSheet4U.com LM4805 Low Voltage High Power Audio Power Amplifier LM4805 Low Voltage High Power Audi...
Datasheet PDF File LM4805 PDF File

LM4805
LM4805

Overview
August 2005 www.
DataSheet4U.
com LM4805 Low Voltage High Power Audio Power Amplifier LM4805 Low Voltage High Power Audio Power Amplifier General 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 8Ω 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.
Key Specifications j Quiescent Power Supply Current (VDD = 3V) j Output Power 14mA (typ) 1W (typ) 2µA (max) (VDD = 3.
0V, RL = 8Ω, THD+N = 2%) j Shutdown Current Features n Pop & click circuitry eliminates noise during turn-on and turn-off transitions n Low, 2µA (max) shutdown current n Low, 14mA (typ) quiescent current n Unity-gain stable n External gain configuration capability Applications n Cellphone n PTT (Push To Talk) mobile phones Connection Diagrams LM4805LQ (5x5) LQ Marking 20126256 Top View U = Wafer Fab Z = Assembly Plant Code XY = Date Code TT = Die Run Code 20126284 Top View Order Number LM4805LQ See NS Package Number LQA28A Boomer ® is a registered trademark of National Semiconductor Corporation.
© 2005 National Semiconductor Corporation DS201262 www.
national.
com LM4805 Typical Application www.
DataSheet4U.
com 20126210 * Cf2 is optional.
FIGURE 1.
Typical Audio Amplifier Applica...


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