UTC UZ1086
LINEAR INTEGRATED CIRCUIT
1.5A ADJUSTABLE/FIXED LOW
DROPOUT LINEAR REGULATOR
1
1
DESCRIPTION
The UTC UZ1086 and UZ1086-1.8V,2.5V, 2.85V, 3.3V
and 5V are low dropout three-terminal regulators with 1.5A
output current capability. These devices have been
optimized for low voltage where transient response and
minimum input voltage are critical. The 2.85V version is
designed specifically to be used in Active Terminators for
SCSI bus.
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 temperatures that would create
excessive junction temperatures.
Unlike PNP type regulators where up to 10% of the
output current is wasted as quiescent current, the
quiescent current of the UZ1086 flows into the load,
increasing efficiency.
TO-263
TO-263-3
1
TO-220
1
1
TO-252
SOT-223
2: V
OUT
3: V
IN
1: ADJ/GND
FEATURES
*Low dropout voltage
*Load regulation: 0.05% typical
*Trimmed current limit
*On-chip thermal limiting
*Three-terminal adjustable or fixed 1.8V, 2.5V, 2.85V,
3.3V, 5V
APPLICATIONS
*Active SCSI terminators
*High efficiency linear regulators
*Post regulators for switching supplies
*Battery charges
*5V to 3.3V linear regulators
*Motherboard clock supplies
UTC
UNISONIC TECHNOLOGIES CO. LTD
1
QW-R102-008,D
UTC UZ1086
TYPICAL APPLICATIONS
LINEAR INTEGRATED CIRCUIT
UZ1086
V
IN
=3.3V
V
IN
+
10µF
ADJ
V
OUT
R1
124Ω
+
22µF
1.5V at 1.5A
V
OUT
=V
REF
(1+R2/R1)+I
Adj
*R2
R2
24.9Ω
V
IN
=5V
V
IN
+
10µF
UZ1086-2.85
V
OUT
GND
2.85V at 1.5A
+
22µF
ABSOLUTE MAXIMUM RATINGS
(Ta=25°C, unless otherwise specified)
PARAMETER
V
IN
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering,10 sec)
MIN
0
-65
MAX
7.5
125
150
300
UNIT
V
°C
°C
°C
ELECTRICAL CHARACTERISTICS
(V
IN
≤7V,
T
J
=25°C, unless otherwise specified.
The*denotes specifications which apply over the specified operating temperature range.)
PARAMETER
Reference Voltage
(note 3)
Output Voltage
SYMBOL
V
REF
*
TEST CONDITIONS
1.5V≤(V
IN –
V
OUT
)
≤5.75V
10mA≤I
OUT
≤1A
10mA≤I
OUT
≤1A
UZ1086-1.8V 3.3V≤V
IN
≤7V
UZ1086-2.5 4V≤V
IN
≤7V
UZ1086-2.85 4.35V≤V
IN
≤7V
UZ1086-3.3 4.8V≤V
IN
≤7V
UZ1086-5.0 6.5V≤V
IN
≤7V
(V
OUT+
1.5V)≤V
IN
≤7V,
I
OUT
=10mA
V
IN –
V
OUT
=2V, 10mA≤I
OUT
≤1A
∆V
REF
=1%,I
OUT
=1.5A
V
IN –
V
OUT
=2V
MIN
1.225
TYP
1.25
MAX
1.275
UNIT
V
*
*
*
*
Line Regulation (note1,2)
Load Regulation
(note1,2)
Dropout Voltage
Current Limit
Adjust Pin Current
(note 3)
Adjust Pin Current
Change (note3)
Minimum Load Current
Quiescent Current
*
*
*
*
*
*
*
*
1.764
2.450
2.793
3.234
4.900
1.80
2.50
2.85
3.30
5.00
0.005
0.05
1.3
2
35
0.2
1.836
2.550
2.907
3.366
5.100
0.2
0.5
1.5
120
5
V
V
V
V
%
%
V
A
µA
µA
mA
mA
1.6
IAdj
1.5V≤(V
IN –
V
OUT
)
≤5.75V,
10mA≤I
OUT
≤1A
1.5V≤(V
IN –
V
OUT
)
≤5.75V
V
IN
=V
OUT+
1.25V
10
4
13
UTC
UNISONIC TECHNOLOGIES CO. LTD
2
QW-R102-008,D
UTC UZ1086
PARAMETER
Ripple Rejection
LINEAR INTEGRATED CIRCUIT
TEST CONDITIONS
f=120Hz,C
OUT
=22µF, Tantalum
V
IN –
V
OUT
=3V, I
OUT
=1.5A
T
A
=25°C,30ms pulse
SYMBOL
MIN
60
TYP
72
MAX
UNIT
dB
Thermal Regulation
0.004 0.02
%/W
Temperature Stability
*
0.5
%
Long-Term Stability
T
A
=125°C, 1000hrs
0.03
1
%
RMS Output Noise
V
OUT
T
A
=25°C, 10Hz≤f≤10kHz
0.003
%
Thermal Resistance
SOT-223
15
°C/W
Junction to Case (note 4)
TO-252,TO-263,TO-220
3
Thermal Shutdown
Junction Temperature
155
°C
Thermal Shutdown
10
°C
Hysteresis
Note:
1.
See thermal regulation specifications for changes in output voltage due to heating effects. Load and line
regulation are measured at a constant junction temperature by low duty cycle pulse testing.
2.
Line and load regulation are guaranteed up to the maximum power dissipation. Power dissipation is determined
by input/output differential and the output current. Guaranteed maximum output power will not be available over
the full input/output voltage range.
3.
UZ1086 adjustable only.
4.
With package soldered to 0.5 square inch copper area over backside ground plane or internal power plane,
Thermal Resistance Junction to Ambient can vary from 30°C/W to more than 50°C/W. Other mounting
techniques may provide better thermal resistance than 30°C/W.
UTC
UNISONIC TECHNOLOGIES CO. LTD
3
QW-R102-008,D
UTC UZ1086
LINEAR INTEGRATED CIRCUIT
Figure 2. Load Regulation vs.Temperature
0.1
0.0
5
0
-0.05
-0.1
-
0.15
-0.2
-75 -50 -25 0
25 50 75 100 125150 175
∆I=1A
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 1.Dropout Voltage vs.Output Current
1.5
1.4
Dropout Voltage Deviation(%)
0.3
0.6
0.9
1.2
Output Current (A)
1.5
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0
0
Dropout Voltage (V)
Junction Temperature(°
C)
Figure 4.Output Voltage vs.Temperature
3.7
3.65
3.6
Reference Voltage(V)
3.55
3.5
3.45
3.4
3.35
3.3
3.25
V
OUT
=3.3V
V
OUT
=3.6V
V
OUT
SET WITH 1% RESISTORS
Figure 3.Reference Votage vs.Temperature
1.25
1.24
5
1.24
1.23
5
1.23
1.225
1.2
2
1.215
1.21
1.205
1.2
-75 -50 -25 0
25 50 75 100 125150 175
Reference Voltage(V)
UZ1086 adjustable Only
3.2
-75 -50 -25 0 25 50 75 100 125150 175
Junction Temperature(°
C)
Junction Temperature(°
C)
UTC
UNISONIC TECHNOLOGIES CO. LTD
4
QW-R102-008,D
UTC UZ1086
5
LINEAR INTEGRATED CIRCUIT
Figure 6.Adjust Pin Current vs.Temperature
100
90
Note1.UZ1086 Only
Figure 5.Minimum Load Current vs.Temperature
Minimum Load Current (mA)
4
Adjust Pin Current (µA)
25 50 75 100 125 150 175
80
70
60
50
40
30
20
10
0
-75 -50 -25 0
3
2
1
0
-75 -50 -25 0
25 50 75 100 125150 175
Junction Temperature(°
C)
Figure 7. Short-Circuit Current vs.Temperature
2.0
1.7
5
90
80
Short- Circuit Current (A)
Ripple Rejection (dB)
Junction Temperature(°
C)
Figure 8. Ripple Rejection vs.Frequency
70
60
50
40
30
20
10
V
IN
-V
OUT
=3V
0.5<V
RIPPLE
<2V
I
OUT
=1A
100
1K
10K
100K
1.5
1.25
1.0
-75 -50 -25 0
25 50 75 100 125 150 175
0
10
Junction Temperature(°
C)
Frequency (Hz)
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.
UTC
UNISONIC TECHNOLOGIES CO. LTD
5
QW-R102-008,D
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