LT1963A Series
ELECTRICAL CHARACTERISTICS
The ■ denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25∞C. (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Reverse Leakage Current (Note 13) Q, T, S8 Packages
ST Package
V
V
= –20V, V
= –20V, V
= 0V
= 0V
■
■
1
2
mA
mA
IN
IN
OUT
OUT
Reverse Output Current (Note 11)
LT1963A-1.5
LT1963A-1.8
LT1963A-2.5
LT1963A-3.3
LT1963A (Note 4)
V
V
V
V
V
= 1.5V, V < 1.5V
600
600
600
600
300
1200
1200
1200
1200
600
mA
mA
mA
mA
mA
OUT
OUT
OUT
OUT
OUT
IN
= 1.8V, V < 1.8V
IN
= 2.5V, V < 2.5V
IN
= 3.3V, V < 3.3V
IN
= 1.21V, V < 1.21V
IN
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
external resistor divider (two 4.12k resistors) for an output voltage of
2.4V. The external resistor divider will add a 300mA DC load on the output.
Note 2: Absolute maximum input to output differential voltage can not be
achieved with all combinations of rated IN pin and OUT pin voltages. With
the IN pin at 20V, the OUT pin may not be pulled below 0V. The total
measured voltage from IN to OUT can not exceed ±20V.
Note 7: Dropout voltage is the minimum input to output voltage differential
needed to maintain regulation at a specified output current. In dropout, the
output voltage will be equal to: V – V
.
IN
DROPOUT
Note 8: GND pin current is tested with V = V
+ 1V and a
IN
OUT(NOMINAL)
Note 3: The LT1963A regulators are tested and specified under pulse load
current source load. The GND pin current will decrease at higher input
voltages.
conditions such that T ª T . The LT1963A is 100% tested at
J
A
T = 25∞C. Performance at –40∞C and 125∞C is assured by design,
A
Note 9: ADJ pin bias current flows into the ADJ pin.
Note 10: SHDN pin current flows into the SHDN pin.
Note 11: Reverse output current is tested with the IN pin grounded and the
OUT pin forced to the rated output voltage. This current flows into the OUT
pin and out the GND pin.
Note 12. For the LT1963A, LT1963A-1.5 and LT1963A-1.8 dropout voltage
will be limited by the minimum input voltage specification under some
output voltage/load conditions.
Note 13. For the ST package, the input reverse leakage current increases
due to the additional reverse leakage current for the SHDN pin, which is
tied internally to the IN pin.
characterization and correlation with statistical process controls.
Note 4: The LT1963A (adjustable version) is tested and specified for these
conditions with the ADJ pin connected to the OUT pin.
Note 5: Operating conditions are limited by maximum junction
temperature. The regulated output voltage specification will not apply for
all possible combinations of input voltage and output current. When
operating at maximum input voltage, the output current range must be
limited. When operating at maximum output current, the input voltage
range must be limited.
Note 6: To satisfy requirements for minimum input voltage, the LT1963A
(adjustable version) is tested and specified for these conditions with an
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Typical Dropout Voltage
Guaranteed Dropout Voltage
Dropout Voltage
500
450
400
350
300
250
200
150
100
50
500
450
400
350
300
250
200
150
100
50
600
500
400
300
200
100
0
TEST POINTS
T
≤ 125°C
J
T
= 125°C
J
I
= 1.5A
L
T
≤ 25°C
J
T
= 25°C
I
= 0.5A
J
L
I
= 100mA
L
I
= 1mA
L
0
0
0
0.8
1.2 1.4
0
0.8
1.2 1.4
0.2 0.4 0.6
1.0
1.6
0.2 0.4 0.6
1.0
1.6
–50
0
25
50
75 100 125
–25
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
TEMPERATURE (°C)
1963 • G01
1963 • G02
1963 G03
1963af
4
Linear [ Linear ]
