Replacement of
LT1086-3.3/2.9/2.5
LT1085-3.3/2.9/2.5
MIK1086-3.3/2.9/2.5
MIK1085-3.3/2.9/2.5
1.5 A/3.0 A Low Dropout
Positive Regulator
August 1995-revised September 2002
Description
The MIK1086/MIK1085 Series 1.5/3.0A fixed voltage regulators are monolithic integrated circuits designed to power the new generation of
microprocessors for use applications requiring a well regulated positive output voltage with low input-output differential voltage requirements
and output voltage 3.3V, 2.9V or 2.5V. Output voltage may be selecting using a jumper on the circuit board. Outstanding features include full
power usage up to 1.5/3.0A of load current, internal current limiting and thermal shutdown. Other fixed versions are also available Vout =
2.0V to 4.0V.
Features
Low Dropout Performance 1V at full Load
Jumper Selected Output Voltage 3.3V, 2.9V, 2.5V
Line Regulation Typically 0.015%
Load Regulation Typically 0.1%
Fast Transient Response
5 Lead TO-220 Packages
Applications
Microprocessor Supplies
Post Regulators for Switching Supplies
High Current Regulators
5V to 3.XXV for Pentium Processors
3.3V to 2.5V for Portable Pentium Processors
Power PC Series Power Supplies
Typical application data fixed
regulator
Package information
Absolute Maximum Ratings
Symbol Parameter
Maximum
Units
V
IN
Input
Voltage
6
V
P
o
Power Dissipation
Internally Limited
W
JC
Thermal Resistance Junction to Case TO-220-5
3
JA
Thermal Resistance Junction to Ambient TO-220-5
50
o
C/W
T
J
Operating Junction Temperature Range
Control Section
Power Transistor
0 to 125
0 to 150
T
STG
Storage Temperature Range
-65 to 150
T
LEAD
Lead Temperature (Soldering 10 Sec.)
260
o
C
Device Selection Guide
Device
Vout, V
Iout, A
MIK1086
3.3, 2.9, 2.5
1.5
MIK1085
3.3, 2.9, 2.5
3.0
Output voltage selecting
Jumper V
OUT
, V
1 2.9
2 3.3
3 2.5
Page 1 of 2
Replacement of
LT1086-3.3/2.9/2.5
LT1085-3.3/2.9/2.5
MIK1086-3.3/2.9/2.5
MIK1085-3.3/2.9/2.5
1.5 A/3.0 A Low Dropout
Positive Regulator
August 1995-revised September 2002
Electrical Characteristics
(V
IN
= 4.75V to 5.25V; I
O
= 10mA to 3.0A(MIK1085); I
O
= 10mA to 1.5A(MIK1086), Unless otherwise specified)
Test Conditions
Test Limits
Parameter Symbol
V
IN
I
O
T
J
(Note 3) Min Typ
Max
Units
10mA 25C
3.267
3.333
V
0
(3.3V)
5V
Over
Temp.
3.234
3.3
3.366
10mA 25C
2.871
2.929
V
0
(2.9V)
5V
Over
Temp.
2.842
2.9
2.958
10mA 25C
2.475
2.525
Output Voltage
V
0
(2.5V)
5V
Over
Temp.
2.450
2.5
2.550
V
25C 0.015
Line Regulation (Note 1)
REG
(LINE)
10mA
Over Temp.
0.035
0.2
25C 0.1
0.3
Load Regulation (Note 1)
REG
(LOAD)
5V
Over Temp.
0.2
0.4
%
25C 1.0
Dropout Voltage
V
OUT =
2%
V
D
Over Temp.
1.1 1.3
V
Current Surge Limit
MIK1085
MIK1086
I
S
4.5
2.5
A
Quiescent current
I
Q
5V
10
16
mA
Temperature Coefficient
T
C
0.005
%/C
Temperature Stability
T
S
5V 0.5A
0.5 %
RMS Output Noise (Note2)
V
N
25C
0.003
%V
o
Ripple Rejection Ratio
MIK1085
MIK1086
R
A
5V
3.0A
1.5A
Over Temp.
60
72
dB
Note 1: Low duty cycle pulse testing.
Note 2: Bandwidth of 10Hz to 10kHz.
Note 3: Over Temp. = over specified operating junction temperature range.
Pad Location LT1085-3.3/2.9/2.5; LT1086-3.3/2.9/2.5
Pad location coordinates
Coordinates m
N Pad
name
X Y
1 Input
1275
1360
2 Output
520
1890
3 Output
2245
1890
4 Output
2155
120
5 GND
930 120
6 Select
2.9V
2655
120
7 Select
2.5V
2660
560
Page 2 of 2
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