LT1761 Series
ELECTRICAL CHARACTERISTICS
PARAMETER
GND Pin Current
V
IN
= V
OUT(NOMINAL)
(Notes 5, 7)
CONDITIONS
I
LOAD
= 0mA
I
LOAD
= 1mA
I
LOAD
= 10mA
I
LOAD
= 50mA
I
LOAD
= 100mA
C
OUT
= 10μF C
BYP
= 0.01μF I
LOAD
= 100mA, BW = 10Hz to 100kHz
,
,
(Notes 3, 8)
V
OUT
= Off to On
V
OUT
= On to Off
V
SHDN
= 0V
V
SHDN
= 20V
V
IN
= 6V, V
SHDN
= 0V
V
IN
– V
OUT
= 1.5V (Avg), V
RIPPLE
= 0.5V
P-P
, f
RIPPLE
= 120Hz,
I
LOAD
= 50mA
V
IN
= 7V, V
OUT
= 0V
V
IN
= V
OUT(NOMINAL)
+ 1V or 2.3V (Note 12),
ΔV
OUT
= –5%
V
IN
= –20V, V
OUT
= 0V
LT1761-1.2
LT1761-1.5
LT1761-1.8
LT1761-2
LT1761-2.5
LT1761-2.8
LT1761-3
LT1761-3.3
LT1761-5
LT1761 (Note 3)
V
OUT
= 1.2V, V
IN
< 1.2V
V
OUT
= 1.5V, V
IN
< 1.5V
V
OUT
= 1.8V, V
IN
< 1.8V
V
OUT
= 2V, V
IN
< 2V
V
OUT
= 2.5V, V
IN
< 2.5V
V
OUT
= 2.8V, V
IN
< 2.8V
V
OUT
= 3V, V
IN
< 3V
V
OUT
= 3.3V, V
IN
< 3.3V
V
OUT
= 5V, V
IN
< 5V
V
OUT
= 1.22V, V
IN
< 1.22V
l
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
MIN
TYP
20
55
230
1
2.2
20
30
0.25
0.8
0.65
0
1
0.01
55
65
200
110
1
10
10
10
10
10
10
10
10
10
5
20
20
20
20
20
20
20
20
20
10
100
2
0.5
3
0.1
MAX
45
100
400
2
4
UNITS
μA
μA
μA
mA
mA
μV
RMS
nA
V
V
μA
μA
μA
dB
mA
mA
mA
μA
μA
μA
μA
μA
μA
μA
μA
μA
μA
Output Voltage Noise
ADJ Pin Bias Current
Shutdown Threshold
SHDN
Pin Current
(Note 9)
Quiescent Current in Shutdown
Ripple Rejection (Note 3)
Current Limit
Input Reverse Leakage Current
Reverse Output Current
(Note 10)
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LT1761 regulators are tested and specified under pulse load
conditions such that T
J
≈ T
A
. The LT1761E is 100% production tested
at T
A
= 25°C. Performance at –40°C and 125°C is assured by design,
characterization and correlation with statistical process controls. The
LT1761I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT1761MP is 100% tested and guaranteed over
the –55°C to 125°C operating junction temperature range.
Note 3:
The LT1761 (adjustable versions) are tested and specified for
these conditions with the ADJ pin connected to the OUT pin.
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, LT1761-1.2, 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.
Note 12:
To satisfy requirements for minimum input voltage, current limit
is tested at V
IN
= V
OUT(NOMINAL)
+ 1V or V
IN
= 2.3V, whichever is greater.
1761sff
6
LINEAR_DIMENSIONS [ LINEAR DIMENSIONS SEMICONDUCTOR ]
