CYStech Electronics Corp.
3A Low Dropout Positive Voltage Regulator
Spec. No. : C540F3
Issued Date : 2003.06.25
Revised Date :
Page No. : 1/4
PL1085-XXXF3
Features
Dropout Voltage 1.3V at 3A Output Current.
Fast Transient Response.
Extremely Tight Line and Load Regulation.
Current Limiting and Thermal Protection.
Adjustable Output Voltage or Fixed 1.5V, 1.8V, 2.5V, 2.85, 3.0V, 3.3V, 3.5V, 5.0V.
Standard 3-Pin Power Packa
ges.
TO-263
Description
The PL1085-XXXF3 is a low dropout three terminal regulator with 3A output current capability. The output voltage is
adjustable with the use of a resistor divider or fixed 1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, 3.5V and 5.0V. Dropout voltage is
guaranteed to be at maximum of 1.3V with the maximum output current. Its low dropout voltage and fast transient response
make it ideal for low voltage microprocessor applications. Current limit and thermal protection provide protection against
any overload condition that would create excessive junction temperatures.
Applications
Mother Board I/O Power Supplies.
Microprocessor Power Supplies.
High Current Regulator.
Post Regulator for Switching Supply.
Typical Application Circuit
Vin=5V
Vout=3.3V
ADJ
C1
10μF
VREF
R1
125Ω
1%
R2
205Ω
1%
C2
10μF
V
REF
=V
OUT
-V
ADJ
=1.25V(typ)
V
OUT
=V
REF
(1+R
1
/R
2
)+I
ADJ
×R
2
I
ADJ
=55µA(typ.)
(1)C1 needed if device is far
away from filter capacitors.
(2)C2 required for stability.
Adjustable Voltage Regulator
Vin=5V
Vout=3.3V
C1
10μF
GND
C2
10μF
Fixed Voltage Regulator
PL1085F3
CYStek Product Specification
CYStech Electronics Corp.
Ordering Information
Device
PL1085-AdjF3
PL1085-1.5F3
PL1085-1.8F3
PL1085-2.5F3
PL1085-2.85F3
Output Voltage
Adjustable
1.5V
1.8V
2.5V
2.85V
Device
PL1085-3.0F3
PL1085-3.3F3
PL1085-3.5F3
PL1085-5.0F3
Spec. No. : C540F3
Issued Date : 2003.06.25
Revised Date :
Page No. : 2/4
Output Voltage
3.0V
3.3V
3.5V
5.0V
Absolute Maximum Ratings
VIN pin to ADJ/GND pin ……………………………………………………………………………………………….7V
Operating Junction Temperature Range ………………………………………………………………………0°C~ 125°C
Storage Temperature Range………………………………………………………………………………..- 65°C ~ 150°C
Thermal Resistance Junction to Case ……………………………………………………………………………… 3°C /W
Thermal Resistance Junction to Ambient (Assume no ambient airflow, no heatsink) …………………………… 60°C /W
Lead Temperature (Soldering) 10 sec. ……………………………………………………………………………….260°C
Electrical Characteristics
(Vin=5V,
Io=10mA,Tj=25℃,unless otherwise noted)
Symbol
V
REF
Parameter
Reference Voltage
Conditions
Tj=25°C
PL1085-1.5
PL1085-1.8
PL1085-2.5
PL1085-2.85
PL1085-3.0
PL1085-3.3
PL1085-3.5
PL1085-5.0
Adj : 2.65V≤Vin≤7V,Tj=25
℃
Fix : 1.4+Vout≤Vin≤7V
10mA≤Io≤3A,Tj=25
℃
Vin-Vout=1.5V
2.65V≤Vin≤7V
2.65V≤Vin≤7V, 0°C≤Tj≤125°C
Io=0.5A, 0°C≤Tj≤125°C
0°C≤Tj≤125°C
10Hz≤f≤10KHz,Tj=25
℃
Vin-Vout=3V, f=120Hz,
Cout=25
μ
F
∆Vout
,
∆V
REF
=1%,
10mA≤Io≤3A
0°C≤Tj≤125°C
Min
1.238
1.48
1.78
2.47
2.82
2.97
3.26
3.46
4.95
-
-
3
-
-
-
-
-
60
-
Typ
1.250
1.50
1.80
2.50
2.85
3.00
3.30
3.50
5.00
0.015
-
-
55
0.2
0.5
5
0.003
72
1.2
Max
1.262
1.52
1.82
2.53
2.88
3.03
3.34
3.54
5.05
0.2
0.6
-
90
5
-
10
-
-
1.3
Units
V
Vo
Output Voltage
V
∆Vo
∆Vo
Is
I
Adj
∆I
Adj
Ts
I
L
V
N
RR
V
D
PL1085F3
Line Regulation
Load Regulation
Current Limit
Adjust Pin Current
Adjust Pin Current
Change
Temperature Stability
Minimum Load Current
RMS Output Noise(% of Vout)
Ripple Rejection Ratio
Dropout Voltage
%
%
A
μ
A
μ
A
%
mA
%
dB
V
CYStek Product Specification
CYStech Electronics Corp.
Block Diagram
Spec. No. : C540F3
Issued Date : 2003.06.25
Revised Date :
Page No. : 3/4
VIN
Current Amp.
V
REF
1.25V
Thermal
Limit
55μA
Current
Limit
VOUT
For fixed voltage
device
ADJ
GND
PL1085F3
CYStek Product Specification
CYStech Electronics Corp.
TO-263 Dimension
Marking :
A
2
C
E
Spec. No. : C540F3
Issued Date : 2003.06.25
Revised Date :
Page No. : 4/4
α
1
F
1085-XXX
B
D
1
2
3
α
2
Style : Pin 1.Adj(GND)
G
2.Vout(TAB)
3.Vin
I
J
K
L
α
3
H
3-Lead Plastic Surface Mounted Package
CYStek Package Code : F3
*:Typical
DIM
A
B
C
D
E
F
G
H
Inches
Min.
Max.
0.3800
0.4050
0.3300
0.3700
-
0.0550
0.5750
0.6250
0.1600
0.1900
0.0450
0.0550
0.0900
0.1100
0.0180
0.0290
Millimeters
Min.
Max.
9.65
10.29
8.38
9.40
-
1.40
14.61
15.88
4.06
4.83
1.14
1.40
2.29
2.79
0.46
0.74
DIM
I
J
K
L
α1
α2
α3
Inches
Min.
Max.
0.0500
0.0700
-
*0.1000
0.0450
0.0550
0.0200
0.0390
-
-
-
-
-
-
Millimeters
Min.
Max.
1.27
1.78
-
*2.54
1.14
1.40
0.51
0.99
6°
8°
6°
8°
0°
5°
Notes :
1.Controlling dimension : millimeters.
2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material.
3.If there is any question with packing specification or packing method, please contact your local CYStek sales office.
Material :
•
Lead : 42 Alloy ; solder plating
•
Mold Compound : Epoxy resin family, flammability solid burning class:UL94V-0
Important Notice:
•
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of CYStek.
•
CYStek reserves the right to make changes to its products without notice.
•
CYStek
semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems.
•
CYStek assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.
PL1085F3
CYStek Product Specification
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