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PDF LN4890 Data sheet ( Hoja de datos )
| Número de pieza | LN4890 | |
| Descripción | 1W Differential Audio Power Amplifiers | |
| Fabricantes | natlinear | |
| Logotipo |  |
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LN4890
Low-Cost, Mono/Stereo, 1 W Differential Audio Power Amplifiers
■ General Description
The LN4890 is an audio power amplifier primarily designed
for demanding applications in mobile phones and other
portable communication device applications. It is capable
of delivering 1 watt of continuous average power to an 8Ω
BTL load with less than 1% distortion (THD+N) from a 5V
DC power supply. Boomer audio power amplifiers were
designed specifically to provide high quality output power
with a minimal amount of external components. The
LN4890 does not require output coupling capacitors or
bootstrap capacitors, and therefore is ideally suited for
mobile phone and other low voltage applications where
minimal power consumption is a primary requirement.
The LN4890 features a low-power consumption shutdown
mode, which is achieved by driving the shutdown pin with
logic low. Additionally, the LN4890 features an internal
thermal shutdown protection mechanism. The LN4890
contains advanced pop & click circuitry which eliminates
noises which would otherwise occur during turn-on and
turn-off transitions. The LN4890 is unity-gain stable and
can be configured by external gain-setting resistors.
■ Key Specifications
PSRR @fIN =217Hz, VDD = 5V
62dB(typ.)
Power Output@VDD= 5.0V &1% THD
1W(typ.)
Power Output @VDD=3.3V &1% THD 400mW(typ.)
Shutdown Current
0.1μA(typ.)
■ Features
Available in space-saving packages
Ultra low current shutdown mode
BTL output can drive capacitive loads
Improved pop & click circuitry eliminates noises
during turn-on and turn-off transitions
2.2 - 5.0V operation
No output coupling capacitors, snubber networks or
bootstrap capacitors required
Thermal shutdown protection
Unity-gain stable
External gain configuration capability
■ Applications
Mobile Phones
PDAs
Portable electronic devices
■ Package
MSOP-8
SOP-8
■ Ordering Information
Ordering Number
LN4890MM
LN4890M
Package
MSOP-8
SOP-8
■ Operating Ratings
Temperature Range
TMIN ≤ TA ≤ TMAX----------------------------------------------------------------------------------------------------- −40°C ≤ TA ≤ 85°C
Supply Voltage ------------------------------------------------------------------------------------------------------------ 2.2V ≤ VDD ≤ 5.0V
Rev.1.0 —Nov. 24, 2011
1
www.natlinear.com
Free Datasheet http://www.datasheet4u.com/
1 page  
■ Electrical Characteristics
(VDD = 5V Unless otherwise specified. Limits apply for TA = 25°C.)
Parameter
Symbol
Condition
IDD
ISD
VSDIH
VSDIL
VOS
ROUT-GND
PO
TWU
TSD
THD+N
PSRR
TSDT
Quiescent Power
Supply Current
Shutdown Current
Shutdown Voltage
Input High
Shutdown Voltage
Input Low
Output Ofsett Voltage
Resistor Output
to GND
Output Power ( 8Ω )
Wake-up time
Thermal Shutdown
Temperature
Total Harmonic
Distortion+Noise
Power Supply
Rejection Ratio
Shut Down Time
VIN = 0V, Io = 0A, No Load
VIN = 0V, Io = 0A, 8Ω Load
VSHUTDOWN = 0V
THD = 2% (max);
f = 1 kHz 8Ω Load
Po = 0.4 Wrms; f = 1kHz
Vripple = 200mV sine p-p
f=217Hz
Vripple = 200mV sine p-p
f=1kHz
8Ω Load
Min
—
—
—
1.2
—
—
7.0
0.8
—
150
—
55
—
LN4890
Typ Max Unit
4 8 mA
5 10 mA
0.1 2 μA
— —V
— 0.4 V
7 50 mV
8.5 9.7 kΩ
1.0 — W
170 220 ms
170 190 ℃
0.1 — %
62
— dB
66
1.0 — ms
Rev.1.0 —Nov. 24, 2011
5
www.natlinear.com
Free Datasheet http://www.datasheet4u.com/
5 Page 
LN4890
Rev.1.0 —Nov. 24, 2011
11
www.natlinear.com
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LN4890.PDF ] | |
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