Datasheet

LT1963A Series
6
1963aff
For more information www.linear.com/LT1963A
elecTrical characTerisTics
The l denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Ripple Rejection V
IN
– V
OUT
= 1.5V (Avg), V
RIPPLE
= 0.5V
P-P
,
f
RIPPLE
= 120Hz, I
LOAD
= 0.75A
55 63 dB
Current Limit V
IN
= 7V, V
OUT
= 0V
V
IN
= V
OUT(NOMINAL)
+ 1V, ∆V
OUT
= –0.1V
●
1.6
2 A
A
Input Reverse Leakage Current (Note 13)
Q, T, S8 Packages V
IN
= –20V, V
OUT
= 0
ST Package
V
IN
= –20V, V
OUT
= 0
●
●
1
2
mA
mA
Reverse Output Current (Note 11)
LT1963A-1.5 V
OUT
= 1.5V, V
IN
< 1.5V
LT1963A-1.8
V
OUT
= 1.8V, V
IN
< 1.8V
LT1963A-2.5
V
OUT
= 2.5V, V
IN
< 2.5V
LT1963A-3.3
V
OUT
= 3.3V, V
IN
< 3.3V
LT1963A (Note 4)
V
OUT
= 1.21V, V
IN
< 1.21V
600
600
600
600
300
1200
1200
1200
1200
600
µA
µA
µA
µA
µA
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: 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 3: The LT1963A regulators are tested and specified under pulse load
conditions such that T
J
≈ T
A
. The LT1963AE is 100% tested at T
A
= 25°C.
Performance at –40°C and 125°C is assured by design, characterization and
correlation with statistical process controls. The LT1963AI is guaranteed
over the full –40°C to 125°C operating junction temperature range. The
LT1963AMP is 100% tested and guaranteed over the –55°C to 125°C
operating junction temperature range.
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
external resistor divider (two 4.12k resistors) for an output voltage of 2.4V.
The external resistor divider will add a 300µA DC load on the output.
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
IN
– V
DROPOUT
.
Note 8: GND pin current is tested with V
IN
= V
OUT(NOMINAL)
+ 1V and a
current source load. The GND pin current will decrease at higher input
voltages.
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.
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