Leshan Radio Co ., Ltd
LR8558
Low noise, fast response 500mA LDO regulator
Features：
General Description：
LR8558 series is a group of positive
voltage output, low power consumption, low
dropout voltage regulator.
LR8558 can provide output value in the
range of 1.2V~4.5V every 0.1V step. It also
can be customized on command.
LR8558 includes high accuracy voltage
reference, error amplifier, current limit circuit
and output driver module with discharge
capability.
LR8558 has excellent load and line
transient response and good temperature
characteristics, which can assure the stability
of chip and power system. And it uses
trimming technique to guarantee output
voltage accuracy within±2%.
LR8558 is available in SOT-23-5, SC-82
packages which is lead free. It also can
available in these packages with lead.
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Low Power Consumption: 75uA（Typ.）
Low output noise (47uVRMS)
Standby Mode: 0.1uA
Low dropout Voltage: 0.46V@500mA (Typ.)
High Ripple Rejection: 66dB@100Hz (Typ.)
Low Temperature Coefficient:
±100ppm/°C
Excellent Line regulation: 0.05%/V
Build-in chip enable and discharge circuit
Output Voltage Range: 1.2V~4.5V
(customized on command every 0.1V step)
Highly Accurate:
±2%
(±1% customized)
Output Current Limit
Applications：
Power source for cellular phones and
various kind of PCSs
Battery Powered equipment
Power Management of MP3, PDA, DSC,
Mouse, PS2 Games
Reference Voltage Source
Regulation after Switching Power
LR8558 Typical Application Circuit
L8558 Ty pical Performance
Characteristics：
L 8558-2.8V Output
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2
0
200
Iload(mA)
400
600
Vout(V)
L 8558
1/11
Leshan Radio Co ., Ltd
Block Diagram：
Absolute Maximum Ratings：
Max input voltage------------------------------------------------------------------------------------10V
Junction Temperature (T
J
)
------------------------------------------------------------------------125°C
Output Current --------------------------------------------------------------------------------------- 500mA
Power Dissipation
SOT-23-5 -------------------------------------------------------------------------------------------250mW
SOT-23-3 -------------------------------------------------------------------------------------------200mW
SOT-89-3 -------------------------------------------------------------------------------------------500mW
TO-92 ------------------------------------------------------------------------------------------------350mW
Storage Temperature (Ts)--------------------------------------------------------------------------45°C½150°C
Recommended Work Conditions：
Item
Input Voltage Range
Ambient Temperature
Min
-40
Recommended
Max
8
85
unit
V
°C
Electrical Characteristics：
（Test
Conditions: Cin=1uF,Cout=3.4uF,TA=25°C, unless otherwise specified.
）
LR8558, for arbitrary output voltage
Symbol
Vin
Vout
Iout (Max.)
Parameter
Input Voltage
Output Voltage
Maximun Output
Current
Conditions
Vin=Set Vout+1V
1mA≤Iout≤30mA
Vin-Vout=1V
Min
Vout
x0.98
500
Typ
Vout1
Max
8
Vout
X1.02
Units
V
V
mA
ge
5/11
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