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PDF LM4893 Data sheet ( Hoja de datos )
| Número de pieza | LM4893 | |
| Descripción | 1.1 Watt Audio Power Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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August 2004
LM4893
1.1 Watt Audio Power Amplifier
General Description
The LM4893 is an audio power amplifier primarily designed
for demanding applications in mobile phones and other por-
table communication device applications. It is capable of
delivering 1.1 watt of continuous average power to an 8Ω
BTL load with less than 1% distortion (THD+N) from a 5VDC
power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4893 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for lower-power portable applications where
minimal space and power consumption are primary require-
ments.
The LM4893 features a low-power consumption global shut-
down mode, which is achieved by driving the shutdown pin
with logic low. Additionally, the LM4893 features an internal
thermal shutdown protection mechanism.
The LM4893 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4893 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
j Improved PSRR at 5V, 3V, & 217Hz
j Higher Power Output at 5V & 1% THD
j Higher Power Output at 3V & 1% THD
j Shutdown Current
62dB (typ)
1.1W (typ)
350mW (typ)
0.1µA (typ)
Features
n No output coupling capacitors, snubber networks or
bootstrap capacitors required
n Unity gain stable
n Ultra low current shutdown mode
n Instantaneous turn-on time
n BTL output can drive capacitive loads up to 100pF
n Advanced pop & click circuitry eliminates noises during
turn-on and turn-off transitions
n 2.2V - 5.5V operation
n Available in space-saving µSMD, SO, and MSOP
packages
Applications
n Mobile Phones
n PDAs
n Portable electronic devices
Typical Application
20038001
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200380
www.national.com
1 page  
External Components Description
(Figure 1)
Components
1. Ri
2. Ci
3. Rf
4. CS
5. CB
Functional Description
Inverting input resistance which sets the closed-loop gain in conjunction with Rf. This resistor also forms a
high pass filter with Ci at fC= 1/(2π RiCi).
Input coupling capacitor which blocks the DC voltage at the amplifiers input terminals. Also creates a
highpass filter with Ri at fc = 1/(2π RiCi). Refer to the section, Proper Selection of External Components,
for an explanation of how to determine the value of Ci.
Feedback resistance which sets the closed-loop gain in conjunction with Ri.
Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply Bypassing
section for information concerning proper placement and selection of the supply bypass capacitor.
Bypass pin capacitor which provides half-supply filtering. Refer to the section, Proper Selection of External
Components, for information concerning proper placement and selection of CB.
Typical Performance Characteristics
THD+N vs Frequency
at VDD = 5V, 8Ω RL, and PWR = 250mW
THD+N vs Frequency
at VDD = 3.0V, 8Ω RL, and PWR = 150mW
20038037
THD+N vs Frequency
at VDD = 2.6V, 8Ω RL, and PWR = 100mW
20038038
THD+N vs Frequency
at VDD = 2.6V, 4Ω RL, and PWR = 100mW
20038039
5
20038040
www.national.com
5 Page 
Typical Performance Characteristics (Continued)
Shutdown Hysterisis Voltage
VDD = 2.6V
Open Loop Frequency Response
Frequency Response vs
Input Capacitor Size
20038078
20038054
20038056
11 www.national.com
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| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LM4893.PDF ] | |
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