LT1763 Series
ELECTRICAL CHARACTERISTICS
Note 6:
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 7:
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 8:
ADJ pin bias current flows into the ADJ pin.
Note 9:
SHDN pin current flows into the SHDN pin.
Note 10:
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 11:
For the LT1763, LT1763-1.5 and LT1763-1.8 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.
TYPICAL PERFORMANCE CHARACTERISTICS
Typical Dropout Voltage
500
GUARANTEED DROPOUT VOLTAGE (mV)
450
DROPOUT VOLTAGE (mV)
T
J
= 125°C
350
300
250
200
150
100
50
0
0
50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
1763 G01
350
300
250
200
150
100
50
0
0
T
J
≤
125°C
T
J
≤
25°C
DROPOUT VOLTAGE (mV)
400
T
J
= 25°C
Quiescent Current
50
45
1.528
1.521
QUIESCENT CURRENT (µA)
40
35
30
25
20
15
10
V
IN
= 6V
5 R
L
=
∞,
I
L
= 0 (LT1763-1.5/-1.8/-2.5/-3/-3.3/-5)
R
L
= 250k, I
L
= 5µA (LT1763)
0
0
25
50
75 100 125
–50 –25
TEMPERATURE (°C)
1763 G04
V
SHDN
= V
IN
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
4
U W
Guaranteed Dropout Voltage
500
450
400
Dropout Voltage
500
450
400
350
300
250
200
150
100
50
I
L
= 50mA
I
L
= 10mA
100
125
I
L
= 1mA
I
L
= 100mA
I
L
= 250mA
I
L
= 500mA
= TEST POINTS
50 100 150 200 250 300 350 400 450 500
OUTPUT CURRENT (mA)
1763 G02
0
–50 –25
50
25
0
75
TEMPERATURE (°C)
1763 G03
LT1763-1.5
Output Voltage
1.84
I
L
= 1mA
1.83
1.82
1.81
1.80
1.79
1.78
1.77
0
25
50
75
100
125
1.514
1.507
1.500
1.493
1.486
1.479
1.472
–50 –25
LT1763-1.8
Output Voltage
I
L
= 1mA
1.76
–50 –25
0
25
50
75
100
125
TEMPERATURE (°C)
1763 G50
TEMPERATURE (°C)
1763 G51
1763fa
LINER [ LINEAR TECHNOLOGY ]
