UNISONIC TECHNOLOGIES CO., LTD
UZ1085
LINEAR INTEGRATED CIRCUIT
www.unisonic.com.tw
1 of 6
Copyright 2005 Unisonic Technologies Co., Ltd
QW-R102-013,D
3A ADJUSTABLE/FIXED LOW
DROPOUT LINEAR
REGULATOR
DESCRIPTION
The UZ1085-xx series are low dropout three-terminal regulators
with 3A output current capability. These devices have been
optimized for low voltage applications including VTT bus
termination, where transient response and minimum input voltage
are critical.
Current limit is trimmed to ensure specified output current and
controlled short-circuit current. On-chip thermal limiting provides
protection against any combination of overload and ambient
temperature that would create excessive junction temperatures.
FEATURES
*Fast transient response
*Low dropout voltage at up to 3A
*Load regulation:0.05% typical
*Trimmed current limit
*On-chip thermal limiting
TO-220
1
TO-263-3
TO-252
1
TO-263
1
1
*Pb-free plating product number: UZ1085L-xx
ORDERING INFORMATION
Order Number
Pin Assignment
Normal
Lead Free Plating
Package
1 2 3
Packing
UZ1085-xx-TA3-A-T UZ1085L-xx-TA3-A-T TO-220
A/G
O I Tube
UZ1085-xx-TN3-A-R UZ1085L-xx-TN3-A-R TO-252
A/G
O I
Tape
Reel
UZ1085-xx-TN3-A-T UZ1085L-xx-TN3-A-T TO-252
A/G
O I Tube
UZ1085-xx-TQ2-A-R UZ1085L-xx-TQ2-A-R TO-263
A/G
O I
Tape
Reel
UZ1085-xx-TQ2-A-T UZ1085L-xx-TQ2-A-T TO-263
A/G
O I Tube
UZ1085-xx-TQ3-A-R UZ1085L-xx-TQ3-A-R TO-263-3
A/G
O I
Tape
Reel
UZ1085-xx-TQ3-A-T UZ1085L-xx-TQ3-A-T TO-263-3
A/G
O I Tube
Note: 1. xx: Output Voltage, refer to Marking Information.
2. A: ADJ (for adjustable regulator), G: GND (for fixed regulator)
UZ1085L-xx-TA3-A-T
(1)Packing Type
(3)Package Type
(4)Output Voltage Code
(5)Lead Plating
(2)Pin Assignment
(1) R: Tape Reel, T: Tube
(2) refer to Pin Assignment
(3) TA3: TO-220, TN3: TO-252, TQ2: TO-263,
TQ 3: TO-263-3
(5) L: Lead Free Plating, Blank: Pb/Sn
(4) xx: refer to Marking Information
UZ1085
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
2 of 6
www.unisonic.com.tw
QW-R102-013,D
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
TO-220
TO-252
TO-263
TO-263-3
1 5 : 1 . 5 V
1 8 : 1 . 8 V
2 5 : 2 . 5 V
3 3 : 3 . 3 V
5 0 : 5 . 0 V
A D : A D J
1
2
3
UTC
UZ1085
Voltage Code
Date Code
Pin Code
Lead Plating
THERMAL DATA
PARAMETER SYMBOL
RATINGS
UNIT
TO-252 12
TO-220 4
Thermal Resistance Junction-Case
TO-263
JC
4
C/W
UZ1085
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
3 of 6
www.unisonic.com.tw
QW-R102-013,D
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage
V
IN
18 V
(V
IN
V
OUT
) * I
OUT
See Figure 1
Junction Temperature
T
J
+125
Operating Temperature
T
OPR
-20 ~ +85
Storage Temperature
T
STG
-40 ~ +150
Note 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2. The device is guaranteed to meet performance specification within 0~+70 operating temperature range
and assured by design from -20~+85.
ELECTRICAL CHARACTERISTICS
(Ta=25, C
OUT
=22F, unless otherwise specified.)
For UZ1085-ADJ(Adjustable)
PARAMETER SYMBOL
TEST
CONDITIONS
MIN.
TYP.
MAX. UNIT
Reference Voltage
V
REF
1.5V(V
IN
V
OUT
)8.25V
10mAI
OUT
3A
1.225 1.25 1.275
V
Line Regulation
V
OUT
(V
OUT
+1.5V) V
IN
12V,
I
OUT
=10mA
0.005
0.2
%
Load Regulation
V
OUT
(V
IN
V
OUT
)=3V, 10mAI
OUT
3A
0.05
0.5
%
Dropout Voltage
V
D
V
REF
%=1%, l
OUT
=3A
1.30
1.40
V
Current Limit
I
LIMIT
(V
IN
-V
OUT
)=2V 3.1
4
A
Adjust Pin Current
Iadj
35
120
A
Adjust Pin Current Change
Iadj
1.5VV
IN
V
OUT
12V
10mAI
OUT
3A
0.2 5 A
Minimum Load Current
I
O(MIN)
1.5V(V
IN
-V
OUT
)12V
10
mA
Quiescent Current
I
Q
V
IN
=12V
4
13
mA
Ripple Rejection
RR
f=120Hz,Tantalum,(V
IN
V
OUT
)=3V
I
OUT
=3A
60 72 dB
Thermal Regulation
Ta=25,30ms pulse
0.004
0.02
%/W
Temperature Stability
V
OUT
0.5 %
Long-Term Stability
V
OUT
Ta=125, 1000hr
0.03
1.0
%
Output Noise(% of V
OUT
) eN
Ta=25,10Hzf10kHz
0.003 %
Thermal Shutdown
150
C
For UZ1085-xx(Fixed Voltage)
PARAMETER SYMBOL
TEST
CONDITIONS
MIN.
TYP.
MAX. UNIT
UZ1085-15
3.0VV
IN
8.5V, 10mAI
OUT
3A
1.470 1.5 1.530
UZ1085-18
3.3VV
IN
8.8V, 10mAI
OUT
3A
1.764 1.8 1.830
UZ1085-25
4.0VV
IN
9.5V, 10mAI
OUT
3A
2.450 2.5 2.550
UZ1085-33
4.8VV
IN
10.3V, 10mAI
OUT
3A
3.234 3.3 3.366
Output Voltage
UZ1085-50
V
OUT
6.5VV
IN
12V, 10mAI
OUT
3A
4.900 5.0 5.100
V
Line Regulation
V
OUT
(V
OUT
+1.5V)V
IN
12V,I
OUT
=10mA
0.005
0.2
%
Load Regulation
V
OUT
(V
IN
V
OUT
)=3V, 10mAI
OUT
3A
0.05
0.5
%
Dropout Voltage
V
D
V
REF
%=1%, l
OUT
=3A
1.30
1.40
V
Current Limit
I
LIMIT
(V
IN
-V
OUT
)=2V 3.1
4
A
Minimum Load Current
Iadj 1.5V(V
IN
-V
OUT
)12V
10
mA
Quiescent Current
I
Q
V
IN
=12V
4
13
mA
Ripple Rejection
RR
f=120Hz, Tantalum,
(V
IN
V
OUT
)=3V,I
OUT
=3A
60 72 dB
Thermal Regulation
Ta=25,30ms pulse
0.004
0.02
%/W
Temperature Stability
V
OUT
Ta=125, 1000hr
0.5 %
Long-Term Stability
V
OUT
0.03
1.0
%
Output Noise(% of V
OUT
) eN
Ta=25,10Hzf10kHz
0.003 %
Thermal shutdown
150
C
UZ1085
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
4 of 6
www.unisonic.com.tw
QW-R102-013,D
TYPICAL APPLICATION CIRCUIT
V
IN
V
OUT
ADJ
V
IN
V
OUT
GND
22F
V
IN
=12V
V
IN
=9V
+
+
R1
124
R2
768
22F
+
+
9V at 3A
3.3V at 3A
V
OUT
=V
REF
(1+R2/R1)+I
ADJ*
R2
UZ1085-ADJ
UZ1085-3.3
22F
22F
UZ1085
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
5 of 6
www.unisonic.com.tw
QW-R102-013,D
TYPICAL CHARACTERISTICS
1.4
1.
3
1.5
0.5
0.5
0
2.5
1.
2
1.1
2
1.5
1
1.0
0.9
0.8
0.7
0.6
3.0
Output Current (A)
Figure 2. Dropout Voltage vs.Output Current
D
r
o
p
o
u
t
V
o
l
t
a
g
e
(
V
)
T=125
T=25
T=0
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
-75 -50 -25
0 25 50 75 100 125 150175
Junction Temperature ()
Figure 3. Load Regulation vs.Temperature
O
u
t
p
u
t
V
o
l
t
age
D
e
v
i
at
i
o
n
(
%
)
I=3A
10
0
15
0
50
0
2
3
4
1
0
0
6
4
2
8
10
12
14
I
O
U
T
(
A
m
p
s
)
Figure 1. Absolute Maximum Sate Operating Area
V
IN
-V
OUT
(V)
1.260
1.255
1.250
1.245
1.240
1.235
1.230
1.225
1.220
1.215
1.210
-75 -50 -25 0
25 50 75 100 125 150 175
Junction Temperature ()
Figure 4. Reference Voltage vs.Temperature
R
e
f
e
r
e
n
c
e
V
o
l
t
a
g
e
(
V
)
3.70
3.65
3.60
3.55
3.50
3.45
3.40
3.35
3.30
3.25
3.20
-75 -50 -25 0
25 50 75 100 125 150 175
Junction Temperature ()
Figure 5. Output Voltage vs.Temperature
R
e
f
e
r
e
n
c
e
V
o
l
t
ag
e
(
V
)
V
OUT
Set With 1% Resistors
V
OUT
=3.6V
V
OUT
=3.3V
UZ1085-3.3
UZ1085-ADJ
5
4
3
2
1
-75 -50 -25 0
25 50 75 100 125 150 175
Junction Temperature ()
Figure 6. Minimum Load Current vs.Temperature
M
i
nm
um
Lo
ad
C
u
r
r
en
t
(
m
A
)
0
UZ1085
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
6 of 6
www.unisonic.com.tw
QW-R102-013,D
TYPICAL CHARACTERISTICS(Cont.)
5.0
4.5
4.0
3.5
-75 -50 -25 0
25 50 75 100 125 150 175
Junction Temperature ()
Figure 8. Short-Circuit Current vs.Temperature
S
h
or
t
-
C
i
r
c
ui
t C
u
r
r
ent
(
A
)
3.0
30
20
90
10
100
10
1k
10k
80
70
60
50
40
0
100k
Frequency (Hz)
Figure 9. Ripple Rejection vs.Frequency
Ri
p
p
l
e
R
e
j
e
c
t
i
o
ns
(
d
B
)
(V
IN
- V
OUT
)3V
0.5VV
RIPPLE
2V
I
OUT
=3A
100
90
80
70
60
-75 -50 -25 0
25 50 75 100 125 150 175
Junction Temperature ()
Figure 7. Adjust Pin Current vs.Temperature
A
d
j
u
s
t
P
i
n C
u
r
r
ent
(
A
)
0
50
40
30
20
10
UZ1085-ADJ
10
0
15
0
50
0
10
15
20
5
0
70
60
50
80 90 100 110
P
o
w
e
r
(
W
)
Figure 10. Maximum Power Dissipation
Case Temperature ()
120 130 140 150
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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