LT3050 Series
5
3050fa
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. Absolute maximum input-to-output differential
voltage is not achievable with all combinations of rated IN pin and OUT pin
voltages. With the IN pin at 50V, the OUT pin may not be pulled below 0V.
The total differential voltage from IN to OUT must not exceed ±50V.
Note 2: The LT3050 is tested and specifi ed under pulse load conditions
such that T
J
~ T
A
. The LT3050E 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 LT3050I is
guaranteed over the full –40°C to 125°C operating junction temperature
range. The LT3050MP is 100% tested over the –55°C to 125°C operating
junction temperature range.
Note 3: The LT3050 adjustable version is tested and specifi ed for these
conditions with ADJ pin connected to the OUT pin.
Note 4: Maximum junction temperature limits operating conditions.
Regulated output voltage specifi cations do not apply for all possible
combinations of input voltage and output current. If operating at the
maximum input voltage, limit the output current range. If operating at the
maximum output current, limit the input voltage range.
Note 5: Dropout voltage is the minimum differential IN-to-OUT voltage
needed to maintain regulation at a specifi ed output current. In dropout,
the output voltage equals (V
IN
- V
DROPOUT
). For some output voltages,
minimum input voltage requirements limit dropout voltage.
Note 6: To satisfy minimum input voltage requirements, the LT3050
adjustable version is tested and specifi ed for these conditions with an
external resistor divider (60k bottom, 440k top) which sets V
OUT
to 5V.
The external resistor divider adds 10A of DC load on the output. This
external current is not factored into GND pin current.
Note 7: GND pin current is tested with V
IN
= V
OUT(NOMINAL)
+ 0.6V and
a current source load. GND pin current increases in dropout. For the
fi xed output voltage versions, an internal resistor divider adds about
10µA to GND pin current. See the GND Pin Current curves in the Typical
Performance Characteristics section.
Note 8: Current limit varies inversely with the external resistor value tied
from the I
MAX
pin to GND. For detailed information on how to set the
I
MAX
pin resistor value, please see the Operation section. If a programmed
current limit is not needed, the I
MAX
pin must be tied to GND and internal
protection circuitry implements short-circuit protection as specifi ed.
Note 9: The I
MIN
fault condition asserts if the output current falls below the
I
MIN
threshold defi ned by an external resistor from the I
MIN
pin to GND.
For detailed information on how to set the I
MIN
pin resistor value, please
see the Operation section. I
MIN
settings below the Minimum I
MIN
Accuracy
specifi cation in the Electrical Characteristics section are not guaranteed
to ± 10% tolerance. If the I
MIN
fault condition is not needed, the I
MIN
pin
must be left fl oating (unconnected).
Note 10: The current monitor ratio varies slightly when V
IMON
≠ V
OUT
. For
detailed information on how to calculate the output current from the I
MON
pin, please see the Operation section. If the current monitor function is not
needed, the I
MON
pin must be tied to GND.
Note 11: To satisfy requirements for minimum input voltage, current limit
is tested at V
IN
= V
OUT(NOMINAL)
+1V or V
IN
= 2.2V, whichever is greater.
Note 12: ADJ pin bias current fl ows out of the ADJ pin:
Note 13: SHDN pin current fl ows into the SHDN pin.
Note 14: Reverse output current is tested with the IN pin grounded and the
OUT pin forced to the specifi ed voltage. This current fl ows into the OUT pin
and out of the GND pin.
Note 15: 100mA of output current does not apply to the full range of input
voltage due to the internal current limit foldback.
Note 16: The ADJ pin cannot be externally driven for fi xed output voltage
options. LTC allows the use of a small feedforward capacitor from OUT
to ADJ to reduce noise and improve transient response. See the Bypass
Capacitance section of the Applications Information.
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum I
MIN
Threshold Accuracy
(Notes 6, 9)
LT3050-3.3: 3.9V < V
IN
< 13.3V, R
IMIN
= 110K
LT3050, LT3050-5: 5.6V < V
IN
< 15V, R
IMIN
= 110K
l
l
0.92
0.9
1.03
1
1.13
1.1
mA
mA
I
MIN
Threshold Accuracy (Notes 6, 9) LT3050-3.3: 3.9V < V
IN
< 13.3V, R
IMIN
= 11.3K
LT3050, LT3050-5: 5.6V < V
IN
< 15V, R
IMIN
= 11.3K
l
l
9.2
9
10.3
10
11.3
11
mA
mA
Current Monitor Ratio (Notes 6, 10)
Ratio = I
OUT
/I
MON
I
LOAD
= 5mA, 25mA, 50mA, 75mA, 100mA
LT3050-3.3: V
IMON
= V
OUT
, 3.9V < V
IN
< 13.3V
LT3050, LT3050-5: V
IMON
= V
OUT
, 5.6V < V
IN
< 15V
l
l
95
95
100
100
105
105
