LT1761 Series
ELECTRICAL CHARACTERISTICS
Note 4:
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 5:
To satisfy requirements for minimum input voltage, the LT1761
(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 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 or at the minimum input
voltage specification. 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 LT1761, LT1761-1.5, LT1761-1.8 and LT1761-2 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 PERFOR A CE CHARACTERISTICS
Typical Dropout Voltage
500
450
DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
350
300
250
200
150
100
50
0
0
T
J
= 125°C
350
300
250
200
150
100
50
0
T
J
≤
125°C
T
J
≤
25°C
DROPOUT VOLTAGE (mV)
400
T
J
= 25°C
10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
1761 G00
Quiescent Current
40
35
V
IN
= 6V
R
L
=
∞
(250k FOR LT1761-BYP, -SD)
I
L
= 0 (5µA FOR LT1761-BYP, -SD)
1.528
1.521
QUIESCENT CURRENT (µA)
OUTPUT VOLTAGE (V)
25
V
SHDN
= V
IN
20
15
10
5
0
–50 –25
V
SHDN
= 0V
0
25
50
75
100
125
TEMPERATURE (°C)
1761 G03
1.507
1.500
1.493
1.486
1.479
1.472
–50 –25
0
25
50
75
100
125
OUTPUT VOLTAGE (V)
30
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
I
L
= 1mA
I
L
= 100mA
= TEST POINTS
0
10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (mA)
1761 G01
0
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
1761 G01.1
LT1761-1.5
Output Voltage
1.84
I
L
= 1mA
1.83
1.82
1.81
1.80
1.79
1.78
1.77
1.514
LT1761-1.8
Output Voltage
I
L
= 1mA
1.76
–50 –25
0
25
50
75
100
125
TEMPERATURE (°C)
1761 G51
TEMPERATURE (°C)
1761 G06
5
LINER [ LINEAR TECHNOLOGY ]
