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LR8503 Datasheet PDF - LRC

Part Number LR8503
Description 250mA CMOS Low Dropout Voltage Low consumption Regulator
Manufacturers LRC 
Logo LRC Logo 



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LR8503 datasheet, circuit
Leshan Radio Company Ltd.
250mA CMOS Low Dropout Voltage
Low consumption Regulator
Features
Low Power Consumption3.0uA Typ.
Maximum Output Current 250mA
Small Dropout Voltage
170mV@100mA (Vout=3.0V)
400mV@250mA (Vout=3.0V)
Input Voltage Range1.5V 10V
Output Voltage Range1.2V~6.0V
customized on command in 0.1V steps
Highly Accurate2%( 1% customized
Output Current Limit
Applications
Battery Powered equipment
Power Management of MP3PDADSC
MousePS2 Games
Reference Voltage Source
Regulation after Switching Power
LR8503 Typical Application Circuit
LR8503
LR8503
Outline
LR8503 series is a group of positive
voltage output, low power consumption, low
dropout voltage, three terminal regulator. It
can provide 250mA output current when
input / output voltage differential drops to
400mVVin =4.0V Vout=3.0V The
very low power consumption of LR8503
Iq=3.0uA can greatly improve natural life
of batteries.
LR8503 can provide output value in the
range of 1.2V~6.0V in 0.1V steps. It also can
customized on command.
LR8503 includes high accuracy voltage
reference, error amplifier, current limit circuit
and output driver module.
LR8503 has well load transient response
and good temperature characteristic, which
can assure the stability of chip and power
system. And it uses trimming technique to
guarantee output voltage accuracy within
2%.
LR8503 is available in SOT-89-3SOT-
23-3 packages which is lead freeit also
can available in these packages with lead.
LR8503 Typical Performance
Characteristic
Output Voltage VS. Output
Cur r e nt(V out=1.5V )
Application hints
NOTE1 Input capacitor (Cin=1uF) is recommended in
all application circuit. Tantalum capacitor is
recommended.
NOTE2Output capacitor (Cout=1uF) is recommended
in all application to assure the stability of
circuit. Tantalum capacitor is recommended.
1.6
1.5
1.4
1.3
1.2
1.1
1
0
100 200
Output Current mA
300
1/12

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LR8503 equivalent
Leshan Radio Company Ltd.
Vout
T Vout
Output Voltage
Temperature
Coefficient
Iout=10mA
50 ppm/°C
LR8503-3.0V
Symbol
Parameter
Conditions
Min Typ Max Units
Vin Input Voltage
8V
Vout
Output Voltage
2.94 3.0 3.06
V
Iout(Max.)
Maximum
Output Current
Vin=4V,Vout>2.94V
250
mA
Dropout
Voltage
Input-Output
Voltage
Differential
Iout=100mA
Iout=200mA
170 300
320 500 mV
Vout
Vin Vout
Vout
Line Regulation
Load Regulation
Iout=40mA
3.2VVin8V
Vin=4.0V
1mAIout100mA
0.2 0.3 %/V
20 40 mV
Iq
Quiescent
Current
Vin=4V
3.0 5.0 uA
Vout
T Vout
Output Voltage
Temperature
Coefficient
Iout=10mA
50 ppm/°C
Typical Application Circuit
Application hints
NOTE1
Input capacitor (Cin=1uF) is
recommended in all application circuit.
Tantalum capacitor is recommended.
NOTE2 Output capacitor (Cout=1uF) is
recommended in all application to
assure the stability of circuit. Tantalum
capacitor is recommended.
Explanation
LR8503 is a series of low dropout voltage and low power consumption three pins regulator. Its
application circuit is very simple, which only needs two outside capacitors. It is composed of these
modules: high accuracy voltage reference, current limit circuit, error amplifier, output driver and
power transistor.
Current Limit module can keep chip and power system away from danger when load current is
more than 250mA.
LR8503 uses trimming technique to assure the accuracy of output value within±2%, at the
same time, temperature compensated is elaborately considered in this chip, which makes LR8503’s
temperature coefficient within 50ppm/
5/12

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Information Total 12 Pages
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