LT1033
3A Negative Adjustable
Regulator
FeaTures
n
n
n
DescripTion
The
LT
®
1033
negative adjustable regulator will deliver
up to 3A output current over an output voltage range of
–1.2V to –32V. Linear Technology has made significant
improvements in these regulators compared to previous
devices, such as better line and load regulation, and a
maximum output voltage error of 1%.
The LT1033 is easy to use and difficult to damage. Internal
current and power limiting as well as true thermal limiting
prevents device damage due to overloads or shorts, even
if the regulator is not fastened to a heat sink.
Maximum reliability is attained with Linear Technology’s
advanced processing techniques combined with a 100%
burn-in in the thermal limit mode. This assures that all
device protection circuits are working and eliminates field
failures experienced with other regulators that receive only
standard electrical testing.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
Ultrafast and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
Guaranteed
1% Initial Voltage Tolerance
Guaranteed
0.015%/V Line Regulation
Guaranteed
0.02%/ W Thermal Regulation
preconDiTioning
n
100% Thermal Limit Burn-In
applicaTions
n
n
n
n
Adjustable Power Supplies
System Power Supplies
Precision Voltage/Current Regulators
On-Card Regulators
Typical applicaTion
Negative 5V Regulator
6
R2
301
2µF
TANT
ADJ
–V
IN
IN
LT1033
OUT
5
2µF
TANT
OUTPUT CURRENT (A)
4
3
2
1
0
Current Limit
+
+
R1
100
–5V, 3A
1033 TA01a
0
5
10
15
20
25
30
INPUT-OUTPUT DIFFERENTIAL (V)
35
1033 TA01b
1033fd
For more information
www.linear.com/LT1033
1
LT1033
absoluTe MaxiMuM raTings
(Note 1)
Power Dissipation ............................... Internally Limited
Input to Output Voltage Differential ..........................35V
Operating Junction Temperature Range
LT1033M
(OBSOLETE)
..................... –55°C to 150°C
LT1033C ................................................ 0°C to 125°C
Storage Temperature Range
LT1033M
(OBSOLETE)
..................... –65°C to 150°C
LT1033C ............................................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec.).................. 300°C
pin conFiguraTion
BOTTOM VIEW
1
2
CASE IS
V
IN
K PACKAGE
4-LEAD TO-3 METAL CAN
T
JMAX
= 150°C,
θ
JA
= 35°C/W(MK)
T
JMAX
= 125°C,
θ
JA
= 35°C/W(CK)
CASE IS V
IN
T PACKAGE
3-LEAD PLASTIC TO-220
T
JMAX
= 125°C,
θ
JA
= 50°C/W
FRONT VIEW
V
OUT
V
IN
ADJ
CASE IS V
IN
P PACKAGE
3-LEAD PLASTIC TO-3P
T
JMAX
= 125°C,
θ
JA
= 35°C/W
FRONT VIEW
V
OUT
V
IN
ADJ
ADJ V
OUT
OBSOLETE PACKAGE
Consider the T Package for Alternate Source
OBSOLETE PACKAGE
Consider the T Package for Alternate Source
orDer inForMaTion
LEAD FREE FINISH
LT1033CT#PBF
LT1033CP#PBF
LEAD BASED FINISH
LT1033CT
LT1033CP
LT1033CK
LT1033MK
TAPE AND REEL
NA
NA
TAPE AND REEL
NA
NA
NA
NA
PART MARKING
LT1033CT
LT1033CP
PART MARKING
LT1033CT
LT1033CP
LT1033CK
LT1033MK
PACKAGE DESCRIPTION
3-Lead Plastic TO-220
3-Lead Plastic TO-3P
PACKAGE DESCRIPTION
3-Lead Plastic TO-220
3-Lead Plastic TO-3P
2-Lead TO-3 Metal Can
2-Lead TO-3 Metal Can
TEMPERATURE RANGE
0°C to 125°C
0°C to 125°C
TEMPERATURE RANGE
0°C to 125°C
0°C to 125°C
0°C to 125°C
–55°C to 125°C
OBSOLETE PACKAGE
OBSOLETE PACKAGE
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
1033fd
2
For more information
www.linear.com/LT1033
LT1033
(Note 2) The
l
denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C.
LT1033M
SYMBOL PARAMETER
V
REF
Reference Voltage
CONDITIONS
|V
IN
– V
OUT
| = 5V, I
OUT
= 5mA,
T
J
= 25°C
3V ≤ |V
IN
– V
OUT
| ≤ 35V
5mA ≤ I
OUT
≤ I
MAX
, P ≤ P
MAX
∆V
OUT
∆I
OUT
Load Regulation
10mA ≤ I
OUT
≤ I
MAX
, (Note 3)
T
J
= 25°C, |V
OUT
| ≤ 5V
T
J
= 25°C, |V
OUT
| ≥ 5V
|V
OUT
| ≤ 5V
|V
OUT
| ≥ 5V
3V ≤ |V
IN
– V
OUT
| ≤ 35V, (Note 2)
T
J
= 25°C
l
elecTrical characTerisTics
LT1033C
MAX
MIN
TYP
MAX
UNITS
V
V
mV
%
mV
%
%/V
%/V
dB
dB
0.02
100
2
5
5.0
3.0
6
2.5
1.5
1.0
%/W
µA
µA
µA
mA
mA
A
A
%
%
%
4.0
2.0
2.7
°C/W
°C/W
°C/W
MIN
TYP
–1.238 –1.250 –1.262 –1.238 –1.250 –1.262
l
–1.215 –1.250 –1.285 –1.200 –1.250 –1.300
l
l
10
0.2
20
0.4
0.005
0.01
56
70
66
80
0.002
50
1.0
75
1.5
0.015
0.04
10
0.2
20
0.4
0.01
0.02
60
77
0.002
65
0.5
2
2.5
1.2
3
0.5
4.3
1.3
0.6
0.3
0.003
2.5
1.2
1.8
50
1.0
75
1.5
0.02
0.05
∆V
OUT
∆V
IN
Line Regulation
Ripple Rejection
V
OUT
= –10V, f = 120Hz
C
ADJ
= 0
C
ADJ
= 10µF
T
J
= 25°C, 10ms Pulse
l
66
0.02
100
2
5
5.0
3.0
6
2.5
1.5
1.0
Thermal Regulation
I
ADJ
∆I
ADJ
Adjust Pin Current
Adjust Pin Current Change
Minimum Load Current
I
SC
∆V
OUT
∆Temp
∆V
OUT
∆Time
e
n
θ
JC
Current Limit
Temperature Stability of
Output Voltage
Long Term Stability
RMS Output Noise
(% of V
OUT
)
Thermal Resistance
Junction to Case
65
0.2
1.0
2.5
1.2
3
0.5
4.3
1.3
0.6
0.3
0.003
10mA ≤ I
OUT
≤ I
MAX
3V ≤ |V
IN
– V
OUT
| ≤ 35V
|V
IN
– V
OUT
| ≤ 35V
|V
IN
– V
OUT
| ≤ 10V
|V
IN
– V
OUT
| ≤ 10V, (Note 3)
|V
IN
– V
OUT
| = 35V, T
J
= 25°C
T
MIN
≤ T ≤ T
MAX
T
A
= 125°C, 1000 Hours
T
A
= 25°C, 10Hz ≤ f ≤ 10kHz
T Package
K Package
P Package
l
l
l
1.2
2.0
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
Unless otherwise indicated, these specifications apply:
|V
IN
– V
OUT
| = 5V; and I
OUT
= 5mA. Power dissipation is internally limited.
However, these specifications apply for power dissipation up to 30W.
See guaranteed minimum output current curve. I
MAX
= 3A.
Note 3:
Testing is done using a pulsed low duty cycle technique. See
thermal regulation specifications for output changes due to heating effects.
Load regulation is measured on the output pin at a point 1/8" below the
base of the package.
1033fd
For more information
www.linear.com/LT1033
3
LT1033
Typical perForMance characTerisTics
Dropout Voltage
2.8
INPUT-OUTPUT DIFFERENTIAL (V)
2.6
REFERENCE VOLTAGE (V)
2.4
2.2
2.0
1.8
1.6
1.4
1.2
0.5
1.0
2.0
1.5
OUTPUT CURRENT (A)
2.5
3.0
1033 G01
Temperature Stability
1.27
1.8
1.6
Minimum Load Current
T
J
= –55°C
1.26
CURRENT (mA)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
T
J
= 150°C
T
J
= –55°C
T
J
= 25°C
T
J
= 150°C
1.25
T
J
= 25°C
1.24
1.23
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
1033 G02
0
0
10
30
20
INPUT-OUTPUT DIFFERENTIAL (V)
40
1033 G03
Ripple Rejection
100
C
ADJ
= 10µF
RIPPLE REJECTION (dB)
100
Ripple Rejection
100
Ripple Rejection
RIPPLE REJECTION (dB)
RIPPLE REJECTION (dB)
80
80
80
C
ADJ
= 10µF
60
C
ADJ
= 0
60
C
ADJ
= 0
60
C
ADJ
= 0
40
V
IN
= –15V
V
OUT
= –10V
I
L
= 500mA
T
J
= 25°C
10
100
C
ADJ
= 10µF
40
V
IN
– V
OUT
= 5V
20 I
L
= 500mA
f = 120Hz
T
J
= 25°C
0
0
–10
–20
–30
OUTPUT VOLTAGE (V)
40
V
IN
= –15V
V
OUT
= –10V
f = 120Hz
T
J
= 25°C
0.1
1
OUTPUT CURRENT (A)
10
1033 G06
20
20
–40
1033 G04
0
1k
10k
FREQUENCY (Hz)
100k
1M
1033 G06
0
0.01
Output Impedance
10
1
V
IN
= –15V
V
OUT
= –10V
I
L
= 500mA
C
L
= 1µF
T
J
= 25°C
0.8
OUTPUT VOLTAGE
DEVIATION (V)
0.6
0.4
0.2
0
–0.2
–0.4
C
ADJ
= 10µF
INPUT VOLTAGE
CHANGE (V)
0
–0.5
–1.0
Line Transient Response
0.6
OUTPUT VOLTAGE
DEVIATION (V)
0.4
0.2
0
–0.2
–0.4
–0.6
LOAD CURRENT (A)
V
OUT
= –10V
I
L
= 50mA
T
J
= 25°C
C
L
= 1µF
0
10
20
TIME (µs)
30
40
1033 G08
Load Transient Response
C
ADJ
= 0
OUTPUT IMPEDANCE ( )
10
0
C
ADJ
= 0
C
ADJ
= 10µF
10
–1
C
ADJ
= 0
C
ADJ
= 10µF
10
–2
0
–0.5
–1.0
–1.5
0
10
–3
V
IN
= –15V
V
OUT
= –10V
I
NL
= 50mA
T
J
= 25°C
C
L
= 1µF
10
20
TIME (µs)
30
40
1033 G09
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
1033 G07
1033fd
4
For more information
www.linear.com/LT1033
LT1033
Typical perForMance characTerisTics
Load Regulation*
5
OUTPUT VOLTAGE DEVIATION (%)
0.8
ADJUSTMENT CURRENT (µA)
4
0.4
OUTPUT CURRENT (A)
Guaranteed Minimum
Output Current
80
75
70
65
60
55
Adjustment Current
3
0
2
–0.4
1
–0.8
0
0.8
1.6
2.4
3.2
OUTPUT CURRENT (A)
4.0
0
0
5
10
15
20
25
30
INPUT-OUTPUT DIFFERENTIAL (V)
35
1033 G11
50
–75 –50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
1033 G12
*THE LT1033 HAS LOAD REGULATION COMPENSATION
WHICH MAKES THE TYPICAL UNIT READ CLOSE TO ZERO.
THIS BAND REPRESENTS THE TYPICAL PRODUCTION SPREAD
1033 G10
1033fd
For more information
www.linear.com/LT1033
5
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