LR8503

Leshan Radio Company Ltd.
LR8503
250mA CMOS Low Dropout Voltage
Low consumption Regulator
Outline
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 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-89-3SOT23-3 packages which is lead freeit also
can available in these packages with lead.
LR8503 Typical Application Circuit
LR8503 Typical Performance
Characteristic
Output Voltage VS. Output
Current(Vout=1.5V)
Output Voltage
V
LR8503
Application hints
1.6
1.5
1.4
1.3
1.2
1.1
1
0
100
200
300
Output Current mA
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.
1/12
Leshan Radio Company Ltd.
Selection Guide
Pin Assignment
Product
Classification
LR8503-XX X X X
Pin Configuration
LR8503-PRM
Packages
RMSOT-23-3
SMSOT-89-3
(Default)
SASOT-89-3
SBSOT-89-3
TTO-92
LR8503-PSM
Output accucy
Default±2
1 ±1
customized
LR8503
Temperature range
PStandard
Default lead free
CStandard
cust omized
LR8503-PSA
LR8503
Output Voltage
121.2V
212.1V
252.5V
303.0V
353.5V
LR8503-PSB
LR8503
505.0V
LR8503-PT
8503
Pin Description
Pin number
SOT-23-3
SOT-89-3
SM
1
3
2
1
2
3
SOT-89-3
(SA)
1
3
2
SOT-89-3
(SB)
2
3
1
PIN Name
Function
Vss
Vin
Vout
NC
NC
Ground
Supply voltage input
Output Voltage
No connect
No connect
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Leshan Radio Company Ltd.
Product Classification
Product Name
Output Voltage
Package Type
LR8503-12PRM
LR8503-15PRM
LR8503-21PRM
LR8503-25PRM
LR8503-30PRM
---------LR8503-50PRM
LR8503-12PSM
LR8503-15PSM
LR8503-21PSM
LR8503-25PSM
LR8503-30PSM
---------LR8503-50PSM
LR8503-12PSA
LR8503-15PSA
LR8503-21PSA
LR8503-25PSA
LR8503-30PSA
---------LR8503-50PSA
LR8503-12PSB
LR8503-15PSB
LR8503-21PSB
LR8503-25PSB
LR8503-30PSB
---------LR8503-50PSB
LR8503-12PT
LR8503-15PT
LR8503-21PT
LR8503-25PT
LR8503-30PT
---------LR8503-50PT
1.2V
1.5V
2.1V
2.5V
3.0V
---------5.0V
1.2V
1.5V
2.1V
2.5V
3.0V
---------5.0V
1.2V
1.5V
2.1V
2.5V
3.0V
---------5.0V
1.2V
1.5V
2.1V
2.5V
3.0V
---------5.0V
1.2V
1.5V
2.1V
2.5V
3.0V
---------5.0V
SOT-23-3
SOT-23-3
SOT-23-3
SOT-23-3
SOT-23-3
SOT-23-3
SOT-23-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
SOT-89-3
TO-92
TO-92
TO-92
TO-92
TO-92
TO-92
TO-92
Package Marking
LR8503
LR8503
LR8503
LR8503
3/12
Leshan Radio Company Ltd.
Block Diagram
Absolute Maximum Ratings
Max input voltage------------------------------------------------------------------------------------10V
Junction Temperature (TJ) ------------------------------------------------------------------------125°C
Ambient Temperature(TA) --------------------------------------------------------------------------40°C85°C
Power Dissipation
SOT-23-3 -------------------------------------------------------------------------------------------0.15W
SOT-23-5 -------------------------------------------------------------------------------------------0.25W
SOT-89-3 -------------------------------------------------------------------------------------------0.5W
Storage Temperature(Ts) --------------------------------------------------------------------------45°C150°C
Lead Temperature and Time ---------------------------------------------------------------------260°C,10S
Recommended Work Conditions
Item
Input Voltage Range
Ambient Temperature
Min
Recommended
-40
Max
8
+125
unit
V
°C
Electrical Characteristics
Test Conditions Cin=1uF,Cout=1uF,T A=25°C, unless otherwise specified.
LR8503-1.5V
Min
Typ
Symbol
Parameter
Conditions
Vin
Input Voltage
1.47
1.5
Vout
Output Voltage
Maximum Output
Iout(Max.)
Vin=2.5V,Vout>1.47
250
Current
Dropout
Input-Output
Iout=100mA
270
Voltage Voltage Differential
Max
8
1.53
Units
V
V
mA
400
mV
∆Vout
∆Vin ⋅ Vout
Line Regulation
Iout=40mA
1.6V≤Vin≤8V
0.2
0.3
%/V
∆Vout
Load Regulation
Vin=2.5V
1mA≤Iout≤100mA
20
40
mV
Iq
Quiescent
Current
Vin=2.5V
3.0
5.0
uA
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Leshan Radio Company Ltd.
∆Vout
∆T ⋅ Vout
LR8503-3.0V
Symbol
Vin
Vout
Iout(Max.)
Dropout
Voltage
Output Voltage
Temperature
Coefficient
Parameter
Input Voltage
Output Voltage
Maximum
Output Current
Input-Output
Voltage
Differential
∆Vout
∆Vin ⋅ Vout
Line Regulation
∆Vout
Load Regulation
Iq
∆Vout
∆T ⋅ Vout
Quiescent
Current
Output Voltage
Temperature
Coefficient
Typical Application Circuit
Iout=10mA
Conditions
Vin=4V,Vout>2.94V
50
Min
Typ
2.94
3.0
ppm/°C
Max
8
3.06
Units
V
V
mA
250
Iout=100mA
170
300
Iout=200mA
320
500
0.2
0.3
%/V
20
40
mV
Vin=4V
3.0
5.0
uA
Iout=10mA
50
Iout=40mA
3.2V≤Vin≤8V
Vin=4.0V
1mA≤Iout≤100mA
mV
ppm/°C
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
Leshan Radio Company Ltd.
Typical Performance Characteristics
1.Load regulation
Output Voltage VS Output Current(Vout=1.5V)
Output Voltage VS Output Current(Vout=3.0V)
1.6
V
V
Output Voltage
1.4
Output Voltage
3.05
1.5
1.3
1.2
1.1
1
0
50
100
150
200
Output Current
250
3
2.95
2.9
2.85
2.8
300
0
50
mA
100
150
200
Output Current
250
300
mA
2.Line Regulation
Vout=1.5V)
3.07
1.505
3.05
1.5
Output Voltage V
1.51
V
Line regulation (Vout=3.0V)
Output Voltage
Line regulation
1.495
1.49
Iout=40mA
Iout=6mA
1.485
1.48
1
2
3
4
5
6
7
3.03
3.01
2.99
2.97
Iout=40mA
Iout=3mA
2.95
2.93
8
3
5
4
Input Voltage V
6
7
8
9
10
Input Voltage V
3.Dropout Voltage
Dropout Voltage (Vout=3.0V)
Dropout Voltage (Vout=1.5V)
1.4
Output Voltage V
V
1.5
Output Voltage
1.6
1.3
1.2
Iout=100mA
Iout=200mA
1.1
1
1.5
1.8
2.1
2.4
Input Voltage
2.7
V
3
3.05
3.04
3.03
3.02
3.01
3
2.99
2.98
2.97
2.96
Iout=100mA
Iout=200mA
3
3.2
3.4
3.6
3.8
4
Input Voltage V
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Leshan Radio Company Ltd.
4
Input Voltage transient response
Vout=1.5V,Iout=1mA
Input Voltage transient response
Vout=1.5V,Iout=10mA
Cin=Cout=1uF
Cin=Cout=1uF
Vin=3.5V
Vin=3.5V
Vin=2.5V
Vin=2.5V
Input Voltage transient response
Vout=3.0V,Iout=10mA
Input Voltage transient response
Vout=3.0V,Iout=1mA
Cin=Cout=1uF
Cin=Cout=1uF
Vin=5V
Vin=5V
Vin=4V
Vin=4V
5
Load transient response
Vout=1.5V
Iout=40mA
Iout=1mA
Load transient response
Vout=3.0V
Iout=40mA
Iout=1mA
7/12
Leshan Radio Company Ltd.
Package Outline
Package
SOT-89-3
Devices per
reel
1000
Unit
mm
Package Dimension:
Taping Specification:M1 Standard Type
M2 Customized
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Leshan Radio Company Ltd.
Taping Reel Dimension
SOT-23-3:
Package
SOT-23-3
Devices per
reel
3000
Unit
mm
Package dimension
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Leshan Radio Company Ltd.
Taping Specification
Taping reel dimension
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Leshan Radio Company Ltd.
SOT-23-5:
Package
SOT-23-5
Devices per
reel
3000
Unit
mm
Package specification
Taping dimensionM1
Standard Type
M2 Customized
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Leshan Radio Company Ltd.
Taping reel dimension
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