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LM4805 Datasheet, PDF (1/18 Pages) National Semiconductor (TI) – 3V, 1W Boosted Boomer | |||
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May 2005
LM4805
3V, 1W Boosted Boomer
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 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 boot-
strap 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 resis-
tors.
Key Specifications
j Quiescent Power Supply Current
(VDD = 3V)
j Output Power
(VDD = 3.0V, RL = 8â¦, THD+N = 2%)
j Shutdown Current
14mA (typ)
1W (typ)
2µA (max)
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
Top View
Order Number LM4805LQ
See NS Package Number LQA28A
20126284
20126256
Top View
U = Wafer Fab
Z = Assembly Plant Code
XY = Date Code
TT = Die Run Code
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2005 National Semiconductor Corporation DS201262
www.national.com
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