LT1962 Series
ELECTRICAL CHARACTERISTICS
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
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.
included in the specification for GND pin current.
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
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. For other fixed voltage versions of
the LT1962, the minimum input voltage is limited by the dropout voltage.
output voltage will be equal to: V – V
.
IN
DROPOUT
Note 8: GND pin current is tested with V = V
or V = 2.3V
IN
IN
OUT(NOMINAL)
(whichever is greater) and a current source load. This means the device is
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Typical Dropout Voltage
Guaranteed Dropout Voltage
Dropout Voltage
400
350
300
250
200
150
100
50
500
450
400
350
300
250
200
150
100
50
400
350
300
250
= TEST POINTS
T
≤ 125°C
J
I
= 300mA
T
= 125°C
= 25°C
L
J
T
≤ 25°C
J
I
= 100mA
L
200
150
T
J
I
= 50mA
L
I
= 10mA
L
100
50
0
I
L
= 1mA
0
0
50
100
200
0
50
150
200
250
300
–25
0
50
75 100 125
0
250
300
–50
25
150
100
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
1962 G01
1962 G02
1962 G03
LT1962-1.8 Output Voltage
Quiescent Current
LT1962-1.5 Output Voltage
50
45
40
35
30
25
20
15
10
5
1.532
1.524
1.516
1.508
1.500
1.492
1.484
1.476
1.468
1.836
1.827
1.818
1.809
1.800
1.791
1.782
1.773
1.764
I
L
= 1mA
I = 1mA
L
V
V
= 6V
IN
SHDN
L
= V
L
IN
R
=
∞
, I = 0 (LT1962-1.5/-1.8
/2.5/-3/-3.3/-5)
= 250k, I = 5µA (LT1962)
R
L
L
0
–50
0
25
50
75 100 125
50
75
50
75
–25
–50 –25
0
25
100 125
–50 –25
0
25
100 125
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
1962 G04
1962 G05
1962 G06
4
Linear [ Linear ]
