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