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.
Power Output @VDD=3.3V &1% THD
Shutdown Current
400mW(typ.)
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
■
Key Specifications
PSRR @f
IN
=217Hz, VDD = 5V
Power Output@VDD= 5.0V &1% THD
62dB(typ.)
1W(typ.)
■
Package
MSOP-8
SOP-8
■
Ordering Information
LN4890XY
项目
符号
描述
Package Type :
X
MM
M
A
Y
C
D
MSOP-8
SOP-8
When the input is greater than 5.2V IC will automatically shut down
No high voltage automatic closing function
No high voltage automatic closing function, and under the high pressure,
the gain will be automatically reduced to 1 times
Rev.1.0
—Nov.
24, 2011
1
www.natlinear.com
LN4890
■
Operating Ratings
Temperature Range
TMIN ≤ TA ≤ TMAX-----------------------------------------------------------------------------------------------------
Supply Voltage ------------------------------------------------------------------------------------------------------------
−40°C ≤ TA ≤ 85°C
2.2V ≤ VDD ≤ 5.0V
■
Pin Configuration
■
Pin Function Description
Pin Number
1
2
3
4
5
6
7
8
Pin Name
SHUTDOWN
BYPASS
+IN
-IN
VO1
VDD
GND
VO2
Function Description
Chip Enable (Low Effective)
Bypass Capacitance Input Pin
Positive Input Terminal (Differential +)
Negative Input Terminal (Differential -)
Negative Output Terminal (Differential -)
Power Supply
Ground Pin
Positive Output Terminal (Differential +)
■
Marking Rule
MSOP-8、SOP-8
XXXX: Date Code
Rev.1.0
—Nov.
24, 2011
2
www.natlinear.com
Embedded System
京公网安备 11010802033920号
EEWORLD
