LT1962 Series
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 3)
PARAMETER
Reverse Output Current
(Note 11)
CONDITIONS
LT1962-1.5
LT1962-1.8
LT1962-2.5
LT1962-3
LT1962-3.3
LT1962-5
LT1962 (Note 4)
V
OUT
= 1.5V, V
IN
< 1.5V
V
OUT
= 1.8V, V
IN
< 1.8V
V
OUT
= 2.5V, V
IN
< 2.5V
V
OUT
= 3V, V
IN
< 3V
V
OUT
= 3.3V, V
IN
< 3.3V
V
OUT
= 5V, V
IN
< 5V
V
OUT
= 1.22V, V
IN
< 1.22V
MIN
TYP
10
10
10
10
10
10
5
MAX
20
20
20
20
20
20
10
UNITS
µA
µA
µA
µA
µA
µA
µA
elecTrical characTerisTics
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 cannot
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 LT1962 is tested and specified under pulse load conditions
such that T
J
≈ T
A
. The LT1962E is tested at T
A
= 25°C and performance
is guaranteed from 0°C to 125°C. Performance of the LT1962E over the
full –40°C to 125°C operating temperature range is assured by design,
characterization, and correlation with statistical process controls. The
LT1962I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
Note 4:
The LT1962 (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 LT1962
(adjustable version) is tested and specified for these conditions with an
external resistor divider (two 250k resistors) for an output voltage of
2.44V. The external resistor divider will add a 5µA 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)
or V
IN
= 2.3V
(whichever is greater) and a current source load. This means the device is
tested while operating in its dropout region. This is the worst-case GND
pin current. The GND pin current will decrease slightly 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. This current is
included in the specification for GND pin current.
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 LT1962, LT1962-1.5 and LT1962-1.8 dropout voltage
will be limited by the minimum input voltage specification under some
output voltage/load conditions. See the curve of Minimum Input Voltage
in the Typical Performance Characteristics section. For other fixed voltage
versions of the LT1962, the minimum input voltage is limited by the
dropout voltage.
Typical perForMance characTerisTics
Typical Dropout Voltage
400
GUARANTEED DROPOUT VOLTAGE (mV)
350
DROPOUT VOLTAGE (mV)
300
250
200
150
100
50
0
0
50
200
250
150
OUTPUT CURRENT (mA)
100
300
1962 G01
Guaranteed Dropout Voltage
500
450
400
350
300
250
200
150
100
50
0
0
50
150
200
250
100
OUTPUT CURRENT (mA)
300
= TEST POINTS
T
J
≤ 125°C
T
J
≤ 25°C
DROPOUT VOTLAGE (mV)
400
350
300
250
200
150
100
50
Dropout Voltage
I
L
= 300mA
T
J
= 125°C
I
L
= 100mA
I
L
= 50mA
I
L
= 10mA
I
L
= 1mA
0
50
75
25
TEMPERATURE (°C)
100
125
T
J
= 25°C
0
–50 –25
1962 G02
1962 G03
4
1962fb
1962fa
For more information
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