Document
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-89-3SOT23-3 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 )
Output Voltage V
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
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Selection Guide LR8503-XX X X X
Packages RMSOT-23-3 SMSOT-89-3
(Default) SASOT-89-3 SBSOT-89-3 TTO-92
Output accucy Default±2 1 ±1
customized
Temperature range PStandard Default lead free CStandard cust omized
Output Voltage 121.2V 212.1V 252.5V 303.0V 353.5V
505.0V
Leshan Radio Company Ltd.
Pin Assignment
Product Classification
LR8503-PRM
Pin Configuration
LR8503-PSM LR8503-PSA LR8503-PSB LR8503-PT
LR8503 LR8503 LR8503 8503
Pin Description
SOT-23-3
1 3 2
Pin number
SOT-89-3
SOT-89-3
SM (SA)
11
23
32
SOT-89-3
(SB) 2 3 1
PIN Name
Vss Vin Vout NC NC
Function
Ground Supply voltage input
Output Voltage No connect No connect
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Leshan Radio Company Ltd.
Product Classification
Product Name
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
Output Voltage
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
Package Type
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
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Block Diagram
Leshan Radio Company Ltd.
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
Max
8
-40 +125
unit V
°C
Electrical Characteristics
Test Conditions
LR8503-1.5V Symbol Vin
Cin=1uF,Cout=1uF,T
Parameter Input Voltage
A=25°C, unless otherwise specified.
Conditions
Min Typ
Vout
Output Voltage
1.47 1.5
Iout(Max.)
Dropout Voltage
Maximum Output Current
Input-Output Voltage Differential
Vin=2.5V,Vout>1.47.