July 2003
General Description
The EC1086 is a series of low dropout positive voltage
regulators with a maximum dropout of 1.5V at 1.5A of
load current.
The EC1086 is available in 1.5V, 1.8V, 2.5V, 3V, 3.3V,
and 5.0V versions. The fixed versions integrate the
adjust resistors. It is also available in an adjustable ver-
sion, which can set the output voltage with only two
external resistors.
The series features on-chip thermal shutdown. It also
includes a bandgap reference and a current limiting cir-
cuit.
The EC1086 series is available in standard packages of
TO-263-3L, TO-220, SOT-223 and TO-252.
Features
Available in 1.5V, 1.8V, 2.5V, 3V, 3.3V, 5.0V and
adjustable versions
Low dropout voltage: typical 1.3V at 1.5A
Current limiting and thermal protection
Low dropout voltage
Output current: 1.5A
Current limit: 2.3A
Operating junction temperature range: 0 ~ 125
o
C
Line regulation: 0.015% (typ.)
Load regulation: 0.1% (typ.)
Applications
High efficiency linear regulators
Battery charger
Post regulation for switching supply
Microprocessor supply
Motherboard power supply
Cable and ADSL modem
DVD-Video player
Telecom equipment
Set top boxes and web boxes modules' supply
Figure 1. Package Types of
EC
1086
TO-220
SOT-223
TO-252
TO-263-3L
Low Dropout Regulator
EC
1086
July 2003
Figure 2. Pin Configuration of
EC
1086
Top View
Pin Configuration
T Package
(TO-220)
S Package
(TO-263-3L)
Functional Block Diagram
Figure 3. Functional Block Diagram of
EC
1086
OUTPUT
ADJ/GND
INPUT
INPUT
OUTPUT
ADJ/GND
1
2
3
1
2
3
D Package
(TO-252)
1
2
3
ADJ/GND
OUTPUT
INPUT
H Package
(SOT-223)
INPUT
OUTPUT
ADJ/GND
1
2
3
Thermal
Protection
+
-
GND (Fixed Output)
ADJ (Adjustable Output)
INPUT
OUTPUT
Low Dropout Regulator
EC
1086
July 2003
Ordering Information
Package
Temperature Range Part Number
Marking ID
Packing Type
SOT-223
0
o
C ~ 125
o
C
EC1086H-ADJ
H86A
Tape/Reel
EC1086H-1.5
H86B
EC1086H-1.8
H86E
EC1086H-2.5
H86C
EC1086H-3.0
H86G
EC1086H-3.3
H86D
EC1086H-5.0
H86F
TO-220
0
o
C ~ 125
o
C
EC1086T-ADJ
EC1086T-ADJ
Tube
EC1086T-1.5
EC1086T-1.5
EC1086T-1.8
EC1086T-1.8
EC1086T-2.5
EC1086T-2.5
EC1086T-3.0
EC1086T-3.0
EC1086T-3.3
EC1086T-3.3
EC1086T-5.0
EC1086T-5.0
TO-263-3L
0
o
C ~ 125
o
C
EC1086S-ADJ
EC1086S-ADJ
Tube/ Tape/Reel
EC1086S-1.5
EC1086S-1.5
EC1086S-1.8
EC1086S-1.8
EC1086S-2.5
EC1086S-2.5
EC1086S-3.0
EC1086S-3.0
EC1086S-3.3
EC1086S-3.3
EC1086S-5.0
EC1086S-5.0
TO-252
0
o
C ~ 125
o
C
EC1086D-ADJ
EC1086D-ADJ
Tube/ Tape/Reel
EC1086D-1.5
EC1086D-1.5
EC1086D-1.8
EC1086D-1.8
EC1086D-2.5
EC1086D-2.5
EC1086D-3.0
EC1086D-3.0
EC1086D-3.3
EC1086D-3.3
EC1086D-5.0
EC1086D-5.0
Low Dropout Regulator
EC
1086
July 2003
Note 1:
Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the
device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those indicated under"Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum
Ratings" for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Symbol
Min
Max
Unit
Operating Junction Temperature Range
T
J
150
o
C
Storage Temperature Range
T
S
-65
150
o
C
Lead Temperature (Soldering, 10 sec.)
T
LEAD
300
o
C
ESD (Human Body Mode)
ESD
2000
V
Parameter
Symbol
Min
Max
Unit
Input Voltage
V
IN
15
V
Operating Junction Temperature Range
T
J
0
125
o
C
Absolute Maximum Ratings (Note 1)
Low Dropout Regulator
EC
1086
July 2003
Electrical Characteristics
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Reference Voltage
V
REF
EC1086-ADJ,
I
OUT
= 10mA, V
IN
-V
OUT
= 2V, T
J
= 25
o
C,
10mA
I
OUT
1.5A, 1.4V V
IN
- V
OUT
6V
1.238
1.225
1.250
1.250
1.262
1.270
V
Output Voltage
V
OUT
EC1086-1.5,
I
OUT
=10mA, V
IN
= 3.5V, T
J
= 25
o
C,
10mA
I
OUT
1.5A, 3V V
IN
10V
1.485
1.47
1.5
1.5
1.515
1.53
V
EC1086-1.8,
I
OUT
= 10mA, V
IN
= 3.8V, T
J
= 25
o
C,
10mA
I
OUT
1. 5A, 3.2V V
IN
10V
1.782
1.746
1.8
1.8
1.818
1.854
V
EC1086-2.5,
I
OUT
= 10mA, V
IN
= 4.5V, T
J
= 25
o
C,
10mA
I
OUT
1.5A, 3.9V V
IN
10V
2.475
2.45
2.5
2.5
2.525
2.55
V
EC1086-3.0,
I
OUT
= 10mA, V
IN
= 4.5V, T
J
= 25
o
C,
10mA
I
OUT
1.5A, 4.9V V
IN
10V
2.97
2.94
3.0
3.0
3.03
3.06
V
EC1086-3.3,
I
OUT
= 10mA, V
IN
= 5V, T
J
= 25
o
C,
10mA
I
OUT
1.5A, 4.75V V
IN
10V
3.267
3.235
3.3
3.3
3.333
3.365
V
EC1086-5.0,
I
OUT
= 10mA, V
IN
= 7V, T
J
= 25
o
C,
10mA
I
OUT
1.5A, 6.5V V
IN
10V
4.95
4.9
5
5
5.05
5.1
V
Line Regulation
V
OUT
EC1086-ADJ, I
OUT
= 10mA,
1.5V
V
IN
10V
0.015
0.035
0.2
0.2
%
EC1086-1.5, I
OUT
= 10mA,
1.5V
V
IN
- V
OUT
10V
0.3
0.6
6
6
mV
EC1086-1.8, I
OUT
= 10mA,
1.5V
V
IN
- V
OUT
10V
0.3
0.6
6
6
mV
EC1086-2.5, I
OUT
= 10mA,
1.5V
V
IN
- V
OUT
10V
0.3
0.6
6
6
mV
EC1086-3.0, I
OUT
= 10mA,
1.5V
V
IN
- V
OUT
10V
0.3
0.6
6
6
mV
EC1086-3.3, I
OUT
= 10mA,
1.5V
V
IN
- V
OUT
10V
0.5
1
10
10
mV
EC1086-5.0, I
OUT
= 10mA,
1.5V
V
IN
- V
OUT
10V
0.5
1
10
10
mV
the entire junction temperature range for operation, 0
o
C to 125
o
C. (P
D
maximum power dissipation , see Note 2.)
Typicals and limits appearing in normal type apply for T
J
= 25
o
C. Limits appearing in Boldface type apply over
Low Dropout Regulator
EC
1086
July 2003
Electrical Characteristics (Continued)
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Load Regulation
V
OUT
EC
1086-ADJ, 10mA
I
OUT
1.5A,
V
IN
- V
OUT
= 2V
0.1
0.2
0.3
0.4
%
EC1086-1.5, 10mA I
OUT
1.5A,
V
IN
- V
OUT
= 2V
3
6
12
20
mV
EC1086-1.8, 10mA I
OUT
1.5A,
V
IN
- V
OUT
= 2V
3
6
12
20
mV
EC1086-2.5, 10mA I
OUT
1.5A,
V
IN
- V
OUT
= 2V
3
6
12
20
mV
EC1086-3.3, 10mA I
OUT
1.5A,
V
IN
- V
OUT
= 2V
3
7
15
20
mV
EC1086-5.0, 10mA I
OUT
1.5A,
V
IN
- V
OUT
= 2V
5
10
20
35
mV
Dropout Voltage
I
O
= 1.5A,
V
REF
= 1%
1.3
1.5
V
Current Limit
I
LIMIT
V
IN
- V
OUT
= 2V,
1.5
2.3
A
Minimum
Load Current
1.4V
V
IN
- V
OUT
10V (For ADJ)
2
5
mA
Quiescent Current
V
IN
= V
OUT
+ 1.3V
5
10
mA
Ripple Rejection
f
RIPPLE
= 120Hz, C
OUT
= 25
F Tantalum,
I
OUT
= 1.5A, V
IN
- V
OUT
= 3V
60
75
dB
Adjust Pin Current
60
120
A
Adjust Pin Current
Change
10mA
I
OUT
1.5A,
1.4V
V
IN
-V
OUT
10V
0.2
5
A
Temperature
Stability
0.5
%
RMS Noise
(% of V
OUT
)
T
A
= 25
o
C, 10Hz
f 10kHz
0.003
%
Thermal Shutdown
Junction Temperature
165
o
C
Thermal Shutdown
Hysteresis
30
o
C
Thermal Resistance
Junction-to-Case
Q
JC
SOT - 223
TO - 263
TO - 220
20
4
4
o
C/W
Typicals and limits appearing in normal type apply for T
J
= 25
o
C. Limits appearing in Boldface type apply over
Note 2: Maximum power dissipation see Figure 5
the entire junction temperature range for operation, 0
o
C to 125
o
C. (P
D
maximum power dissipation , see Note 2.)
Low Dropout Regulator
EC
1086
July 2003
Typical Performance Characteristics
Figure 4. Output Voltage vs. Temperature
Figure 5. Maximum Power Dissipation
Figure 7. Dropout Voltage vs. Output Current
0
25
50
75
100
125
3.10
3.15
3.20
3.25
3.30
3.35
3.40
O
u
tp
ut
V
olt
a
ge (
V
)
Ambient Temperature (
o
C)
25
50
75
100
125
0.0
2.5
5.0
7.5
10.0
SOT223
Po
w
e
r
(W
)
Case Temperature (
o
C)
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
T
A
=25
o
C
T
A
=0
o
C
D
r
op
ou
t Vol
t
a
g
e
(V)
Output Current (A)
0
25
50
75
100
125
1.220
1.225
1.230
1.235
1.240
1.245
1.250
1.255
1.260
Ref
e
ren
c
e Vol
t
age (V
)
Ambient Temperature (
o
C)
Figure 6. Reference voltage vs. Temperature
Low Dropout Regulator
EC
1086
July 2003
Figure 9. Adjust Pin Current vs. Temperature
Figure 10. Minimum Load Current vs. Temperature
Typical Performance Characteristics (Continued)
0
25
50
75
100
125
0
10
20
30
40
50
60
70
80
90
100
Adju
s
t
P
i
n Cu
rr
e
n
t
(uA)
Ambient Temperature (
o
C)
0
25
50
75
100
125
0
1
2
3
4
5
M
i
nim
um
Load
Cur
r
ent (m
A)
Ambient Temperature (
o
C)
10
100
1k
10k
100k
20
30
40
50
60
70
80
Rippl
e Re
jec
t
i
on (d
B)
Frequency (Hz)
Figure 11. Ripple Rejection vs. Frequency
Figure 8. Short Circuit Current vs. Temperature
0
25
50
75
100
125
1.00
1.25
1.50
1.75
2.00
2.25
Short
Circ
uit
Current
(A)
Ambient Temperature (
o
C)
Low Dropout Regulator
EC
1086
July 2003
Figure 13.
Typical Performance Characteristics (Continued)
Figure 12. Load Transient Response
Line Transient Response
Low Dropout Regulator
EC
1086
July 2003
Typical Applications
Figure 14. Typical Applications of
EC
1086
EC1086-AD J
V
IN
V
OUT
ADJ
V
IN
10F
Tantalum
120
R2
22F
Tantalum
+
+
+
+
V
IN
EC1086-5.0
V
IN
V
OUT
GND
10F
Tantalum
22F
Tantalum
V
OUT
V
OUT
R1
V
OUT
=V
REF
(1+R2/R1) + I
ADJ
. R2
Low Dropout Regulator
EC
1086
July 2003
Mechanical Dimensions
TO-263-3L
7
3
7
8
.
7+
0
.
9
5
-
0
.
0
6
1.270.12
0.81+0.18
-0.30
2.54
2.54
1.270.12
10.16+0.13
-0.51
4
.
5
7+
0
.
2
5
-
0
.
5
0
3
1
.
2
7
+
0
.
1
2
2.54
2.54
5
.
6
7.42
7.98
1
5
.
2
5
0
.
4
9
8.84
2.670.03
0.060.04
3
5
33
0.38
2
.
5
4
0
.
1
5
0.380.02
2
.
2
0
70
Unit: mm
Low Dropout Regulator
EC
1086
July 2003
TO-220
3.810.25
1
5
.
3
7
1
.
1
4
1.460.30
0.813
8
.
7
6
3
2.54
2.54
0.3810.025
2.480.40
3
7
4.190.63
7
10.160.50
0.950.40
2
9
.
0
8
1
.
2
0
60
0.381
0.381
2
.
9
8
0
.
4
0
60
9
.
0
2
0
.
5
0
1.500.20
0.20
1
.
8
5
CJ
Mechanical Dimensions (Continued)
Unit: mm
Low Dropout Regulator
EC
1086
July 2003
SOT-223
Mechanical Dimensions (Continued)
6.500.20
3
.
5
0
0
.
2
0
7
.
0
0
0
.
3
0
4.001.00
2.300.10
0.710.10
1
.
6
0
0
.
1
0
0
.
0
5
0
.
0
4
0
.
4
0
12
2
2
11
0.300.05
0
.
9
0
0
.
1
5
0.25
R0.150.05
R0.150.05
3
6
2
12
12
2
Unit: mm
Low Dropout Regulator
EC
1086
July 2003
4
3
1
.
5
8
0
.
1
8
0.070.05
0.520.06
30.10
30.10
2.290.05
0
.
8
0
0
.
1
5
9
.
8
0
0
.
3
0
2.290.05
0.80.05
0.710.07
5.330.10
6.530.15
2
.
8
0
0
.
2
0
5
.
4
6
0
.
1
0
2.280.10
0
.
6
5
5
8
0.445
0.51
0.510.03
1.200.12
TO-252
Mechanical Dimensions (Continued)
Unit: mm
Low Dropout Regulator
EC
1086
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