Replacement of
LT1581
MIK1581
10 A Low Dropout Positive
Regulator
July 2000
Description
The MIK1581 high performance positive voltage regulators designed for use in applications requiring low dropout performance at full
rated current. Additionally, the MIK1581 provides excellent regulation over variations due to changes in line, load and temperature.
Outstanding features include low dropout performance at rated current, fast transient response, internal current limiting and thermal
shutdown protection of the output device. The MIK1581 Series are three terminal regulators with fixed and adjustable voltage options.
Features
Low dropout performance 1.4V max.
Fast transient response
2% Total output regulation over line, load and temperature
Adjust pin current max 90 mA over temperature
Line regulation 0.2% max
Load regulation 0.4% max
Fixed/adjustable output voltage
TO-220 package
Package Information
Absolute Maximum Ratings
Symbol Parameter
Maximum
Units
V
IN
Input
Voltage
7
V
P
D
Power Dissipation
Internally Limited
W
JC
Thermal Resistance Junction to Case
TO-220
1.6
JA
Thermal Resistance Junction to
Ambient TO-220
50
o
C/W
T
J
Operating Junction Temperature Range
0 to 125
o
C
T
STG
Storage Temperature Range
-65 to 150
o
C
T
LEAD
Lead Temperature (Soldering) 10 Sec.
260
o
C
Device Selection Guide
Device
Output Voltage, V
MIK1581-2.5 2.5
MIK1581-2.85 2.85
MIK1581-2.9 2.9
MIK1581-3.3 3.3
MIK1581-3.45 3.45
MIK1581
1.3 to 4.0
Block Diagram
CURRENT
LIMITING
AMPLIFIER
VOLTAGE
REGULATION
AMPLIFIER
V
REF
THERMAL OVERLOAD
ADJ/GND
OUTPUT
INPUT
LIMIT
SENSE
Page 1 of 3
Replacement of
LT1581
MIK1581
10 A Low Dropout Positive
Regulator
July 2000
Electrical Characteristics
Unless otherwise specified, Adjust model V
IN
= 2.75V to 7.0V I
O
= 10 mA to 10.0 A
Fixed model V
IN
= 4.75V to 7.0V I
O
= 0 mA to 10.0 A
Test Conditions
Test Limits
Symbol Parameter
V
IN
I
O
T
J
(Note 4) Min Typ Max
Units
V
0
Output Voltage (Note 1)
5V
0mA
25
o
C 0.99|V
0
| 1.01|V
0
|
Fixed Model
Over Temp.
0.98|V
0
|
V
0
1.02|V
0
|
V
V
REF
Reference Voltage (Note 1)
5V
10mA
25
o
C 1.238
1.250
1.262
Adjust Model
Over Temp.
1.225
1.275
V
REG
(LINE)
Line Regulation (Note 1)
10mA
25
o
C
0.015
0.2
Over
Temp.
0.035
%
REG
(LOAD)
Load Regulation (Note 1)
5V
25
o
C 0.1
0.3
Over
Temp.
0.2
0.4
%
V
D
Dropout
Voltage
25
o
C 1.1
V
REF =
1%
Over
Temp.
1.2
1.4
V
I
S
Current Limit
Over Temp.
10.0
12
A
I
Q
Quiescent
Current
Fixed Model
5V
Over
Temp. 12 13 mA
T
C
Temperature
Coefficient
0.005 %/
o
C
I
adj
Adjust Pin Current
25
o
C 55
90
I
adj
Adjust Pin Current Change
0.2
5
A
T
S
Temperature Stability
5V
0.5A
Over Temp.
0.5
%
I
0
Minimum Load Current
Adjust Model
5V
5 10 mA
V
N
RMS Output Noise (Note 2)
25
o
C
0.003
%V
0
R
A
Ripple Rejection Ratio (Note 3)
5V
10.0A
Over Temp.
60
70
dB
Note 1: Low duty cycle pulse testing with Kelvin connections required.
Note 2: Bandwidth of 10Hz to 10kHz.
Note 3: 120Hz input ripple C
ADJ
= 25F.
Note 4: Over Temp. - over specified operating junction temperature range.
Typical Applications
FIXED
VOLTAGE REGULATOR (Notes 1, 2)
MIK1581-3.3
3.3V V
out
10F
30F
TANT
+
C
1
C
2
V
4.75V
IN
10A
+
I
out
3
2
1
ADJUSTABLE
VOLTAGE REGULATOR (Notes 1, 2)
MIK1581
3.45V V
out
10F
+
C
1
30F
TANT
C
2
V =5V
IN
10A
V
REF
1
I
adj
133
1%
232
1%
V = V
(1+ )+I
R
out
REF
ADJ
2
R
2
R
1
R
1
R
2
2
3
+
I
out
Note 1: C
1
NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS
Note 2: C
2
REQUIRED FOR STABILITY
Page 2 of 3
Replacement of
LT1581
MIK1581
10 A Low Dropout Positive
Regulator
July 2000
Pad Location MIK1581
Chip size: 3.1 x 3.3 mm
Pad Location Coordinates
Coordinates (m)
Pad N
Pad name
X Y
1
Adj - Adjust model
GND - Fixed model
290 250
2 Out 290
440
890
2210
2660
916
2035
2035
2035
2035
3 In 1550
1550
1550
1550
1325
1735
2325
2735
Note : recommended wire diameter 120 m (minimum)
Pad 1 - one connection
Pad 2 - five connections
Pad 3 - four connections
Page 3 of 3
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