UNISONIC TECHNOLOGIES CO., LTD
UZ1085
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.
LINEAR INTEGRATED CIRCUIT
1
1
TO-252
TO-220
1
1
TO-263
TO-263-3
FEATURES
*Fast transient response
*Low dropout voltage at up to 3A
*Load regulation:0.05% typical
*Trimmed current limit
*On-chip thermal limiting
*Pb-free plating product number: UZ1085L-xx
ORDERING INFORMATION
Order Number
Normal
Lead Free Plating
UZ1085-xx-TA3-A-T
UZ1085L-xx-TA3-A-T
UZ1085-xx-TN3-A-R
UZ1085L-xx-TN3-A-R
UZ1085-xx-TN3-A-T
UZ1085L-xx-TN3-A-T
UZ1085-xx-TQ2-A-R
UZ1085L-xx-TQ2-A-R
UZ1085-xx-TQ2-A-T
UZ1085L-xx-TQ2-A-T
UZ1085-xx-TQ3-A-R
UZ1085L-xx-TQ3-A-R
UZ1085-xx-TQ3-A-T
UZ1085L-xx-TQ3-A-T
Package
TO-220
TO-252
TO-252
TO-263
TO-263
TO-263-3
TO-263-3
Pin Assignment
1
2
3
A/G
O
I
A/G
O
I
A/G
O
I
A/G
O
I
A/G
O
I
A/G
O
I
A/G
O
I
Packing
Tube
Tape Reel
Tube
Tape Reel
Tube
Tape Reel
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
(2)Pin Assignment
(3)Package Type
(4)Output Voltage Code
(5)Lead Plating
(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
(4) xx: refer to Marking Information
(5) L: Lead Free Plating Blank: Pb/Sn
,
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Copyright © 2005 Unisonic Technologies Co., Ltd
1 of 6
QW-R102-013,D
UZ1085
MARKING INFORMATION
PACKAGE
TO-220
TO-252
TO-263
TO-263-3
VOLTAGE CODE
15
18
25
33
50
AD
:1.5V
:1.8V
:2.5V
:3.3V
:5.0V
:ADJ
LINEAR INTEGRATED CIRCUIT
MARKING
UTC
UZ1085
Voltage Code
Lead Plating
Pin Code
Date Code
1
2
3
THERMAL DATA
PARAMETER
TO-252
Thermal Resistance Junction-Case
TO-220
TO-263
SYMBOL
RATINGS
12
4
4
UNIT
°C/W
Θ
JC
UNISONIC TECHNOLOGIES CO., LTD
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QW-R102-013,D
UZ1085
ABSOLUTE MAXIMUM RATINGS
PARAMETER
LINEAR INTEGRATED CIRCUIT
SYMBOL
V
IN
RATINGS
UNIT
Input Voltage
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
=22μF, unless otherwise specified.)
For UZ1085-ADJ(Adjustable)
PARAMETER
Reference Voltage
Line Regulation
Load Regulation
Dropout Voltage
Current Limit
Adjust Pin Current
Adjust Pin Current Change
Minimum Load Current
Quiescent Current
Ripple Rejection
Thermal Regulation
Temperature Stability
Long-Term Stability
Output Noise(% of V
OUT
)
Thermal Shutdown
For UZ1085-xx(Fixed Voltage)
PARAMETER
SYMBOL
TEST CONDITIONS
3.0V≤V
IN
≤8.5V,
10mA≤I
OUT
≤3A
UZ1085-15
3.3V≤V
IN
≤8.8V,
10mA≤I
OUT
≤3A
UZ1085-18
Output Voltage
V
OUT
4.0V≤V
IN
≤9.5V,
10mA≤I
OUT
≤3A
UZ1085-25
4.8V≦V
IN
≦10.3V,
10mA≦I
OUT
≦3A
UZ1085-33
6.5V≦V
IN
≦12V,
10mA≦I
OUT
≦3A
UZ1085-50
Line Regulation
∆V
OUT
(V
OUT
+1.5V)≦V
IN
≦12V,I
OUT
=10mA
Load Regulation
∆V
OUT
(V
IN
– V
OUT
)=3V, 10mA≦I
OUT
≦3A
△V
REF
%=1%, l
OUT
=3A
Dropout Voltage
V
D
Current Limit
I
LIMIT
(V
IN
-V
OUT
)=2V
Minimum Load Current
∆Iadj
1.5V≦(V
IN
-V
OUT
)≦12V
Quiescent Current
I
Q
V
IN
=12V
f=120Hz, Tantalum,
Ripple Rejection
RR
(V
IN
– V
OUT
)=3V,I
OUT
=3A
Ta=25℃,30ms pulse
Thermal Regulation
Temperature Stability
∆V
OUT
Ta=125℃, 1000hr
Long-Term Stability
Output Noise(% of V
OUT
)
Thermal shutdown
∆V
OUT
eN
Ta=25℃,10Hz≦f≦10kHz
MIN. TYP. MAX. UNIT
1.470 1.5 1.530
1.764 1.8 1.830
V
2.450 2.5 2.550
3.234 3.3 3.366
4.900 5.0 5.100
0.005 0.2
%
0.05
0.5
%
1.30 1.40
V
3.1
4
A
10
mA
4
13
mA
60
72
0.004
0.5
0.03
0.003
150
0.02
1.0
dB
%/W
%
%
%
°C
3 of 6
QW-R102-013,D
SYMBOL
V
REF
∆V
OUT
∆V
OUT
V
D
I
LIMIT
Iadj
∆Iadj
I
O(MIN)
I
Q
RR
∆V
OUT
∆V
OUT
eN
TEST CONDITIONS
1.5V≦(V
IN
– V
OUT
)≦8.25V
10mA≦I
OUT
≦3A
(V
OUT
+1.5V)
≦V
IN
≦12V,
I
OUT
=10mA
(V
IN
– V
OUT
)=3V, 10mA≦I
OUT
≦3A
△V
REF
%=1%, l
OUT
=3A
(V
IN
-V
OUT
)=2V
1.5V≦（V
IN
– V
OUT
）≦12V，
10mA≦I
OUT
≦3A
1.5V≦(V
IN
-V
OUT
)≦12V
V
IN
=12V
f=120Hz,Tantalum,(V
IN
–V
OUT
)=3V
I
OUT
=3A
Ta=25℃,30ms pulse
Ta=125℃, 1000hr
Ta=25℃,10Hz≦f≦10kHz
MIN.
1.225
TYP. MAX. UNIT
1.25
0.005
0.05
1.30
4
35
0.2
4
1.275
0.2
0.5
1.40
120
5
10
13
V
%
%
V
A
µA
µA
mA
mA
dB
0.02
1.0
%/W
%
%
%
°C
3.1
60
72
0.004
0.5
0.03
0.003
150
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
UZ1085
TYPICAL APPLICATION CIRCUIT
LINEAR INTEGRATED CIRCUIT
V
IN
=12V
22μF
+
UZ1085-ADJ
V
OUT
V
IN
ADJ
R1
124Ω
R2
768Ω
+
9V at 3A
22μF
V
OUT
=V
REF
(1+R2/R1)+I
ADJ*
R2
V
IN
=9V
22μF
+
UZ1085-3.3
V
OUT
V
IN
GND
3.3V at 3A
+
22μF
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4 of 6
QW-R102-013,D
UZ1085
TYPICAL CHARACTERISTICS
LINEAR INTEGRATED CIRCUIT
4
1.5
1.4
1.
3
1.
2
1.1
1.0
0.9
0.8
0.7
0
50
4
6
8
10
0
10
12
15
0
14
0.6
0.5
0
0.5
1
1.5
2
2.5
3.0
T=25℃
T=0℃
T=125℃
2
1
0
0
2
V
IN
-V
OUT
(V)
Dropout Voltage (V)
3
I
OUT
(Amps)
Output Current (A)
Figure 2. Dropout Voltage vs.Output Current
Figure 1. Absolute Maximum Sate Operating Area
0.10
1.260
△I=3A
1.255
Output Voltage Deviation (%)
0.05
Reference Voltage (V)
1.250
1.245
1.240
1.235
1.230
1.225
1.220
1.215
0
-0.05
-0.10
-0.15
-0.20
-75 -50 -25
0
25 50 75 100 125 150175
1.210
-75 -50 -25
0
25
50 75 100 125 150 175
Junction Temperature (℃)
Figure 3. Load Regulation vs.Temperature
Junction Temperature (℃)
Figure 4. Reference Voltage vs.Temperature
3.70
3.65
V
OUT
Set With 1% Resistors
V
OUT
=3.6V
5
3.55
3.50
3.45
3.40
3.35
3.30
3.25
3.20
-75 -50 -25
0
25
UZ1085-ADJ
Minmum Load Current (mA)
Reference Voltage (V)
3.60
4
3
2
V
OUT
=3.3V
1
UZ1085-3.3
50 75 100 125 150 175
0
-75 -50 -25 0 25 50 75 100 125 150 175
Junction Temperature (℃)
Figure 6. Minimum Load Current vs.Temperature
Junction Temperature (℃)
Figure 5. Output Voltage vs.Temperature
UNISONIC TECHNOLOGIES CO., LTD
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5 of 6
QW-R102-013,D
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