Datasheet

4
LT1962 Series
TYPICAL PERFOR A CE CHARACTERISTICS
UW
OUTPUT CURRENT (mA)
0
DROPOUT VOLTAGE (mV)
150
200
250
150
250
1962 G01
100
50
0
50 100 200
300
350
400
300
T
J
= 125°C
T
J
= 25°C
OUTPUT CURRENT (mA)
0
0
GUARANTEED DROPOUT VOLTAGE (mV)
100
200
300
50
100
150 200
1962 G02
250
400
500
50
150
250
350
450
300
= TEST POINTS
T
J
≤ 125°C
T
J
≤ 25°C
TEMPERATURE (°C)
–50
DROPOUT VOTLAGE (mV)
350
25
1962 G03
200
100
–25 0 50
50
0
400
300
250
150
75 100 125
I
L
= 300mA
I
L
= 100mA
I
L
= 50mA
I
L
= 10mA
I
L
= 1mA
Typical Dropout Voltage Guaranteed Dropout Voltage Dropout Voltage
Quiescent Current
TEMPERATURE (°C)
–50
0
QUIESCENT CURRENT (µA)
5
15
20
25
50
35
0
50
75
1962 G04
10
40
45
30
–25
25
100
125
V
IN
= 6V
V
SHDN
= V
IN
R
L
= ∞ , I
L
= 0 (LT1962-1.5/-1.8
/2.5/-3/-3.3/-5)
R
L
= 250k, I
L
= 5µA (LT1962)
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
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
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. For other fixed voltage versions of
the LT1962, the minimum input voltage is limited by the dropout voltage.
LT1962-1.5 Output Voltage
LT1962-1.8 Output Voltage
TEMPERATURE (°C)
–50
OUTPUT VOLTAGE (V)
125
1962 G05
0
50
100
–25
25
75
1.532
1.524
1.516
1.508
1.500
1.492
1.484
1.476
1.468
I
L
= 1mA
TEMPERATURE (°C)
–50
OUTPUT VOLTAGE (V)
125
1962 G06
0
50
100
–25
25
75
1.836
1.827
1.818
1.809
1.800
1.791
1.782
1.773
1.764
I
L
= 1mA