LT3501
4
3501fd
Typical perForMance characTerisTics
Note 4: An internal power-on reset (POR) latch is set on the positive
transition of the SHDN pin through its threshold. The output of the latch
activates current sources on each SS pin which typically sink 1.5mA,
discharging the SS capacitor. The latch is reset when both SS pins are
driven below the soft-start POR threshold or the SHDN pin is taken below
its threshold.
Note 5: To enhance dropout operation, the output switch will be turned off
for the minimum off-time only when the voltage across the boost capacitor
drops below the minimum boost for 100% duty cycle threshold.
Note 6: The IND to V
OUT
maximum current is defined as the value of
current flowing from the IND pin to the V
OUT
pin which resets the switch
latch when the V
C
pin is at its high clamp.
Note 7: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
Note 8: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Feedback Voltage vs Temperature R
T
/SYNC Voltage vs Temperature
Shutdown Threshold and Minimum
Input Voltage vs Temperature
Shutdown Quiescent Current
vs Temperature
Soft-Start Source Current
vs Temperature
TEMPERATURE (°C)
–50
0.806
0.811
25 75
3501 G02
0.801
0.796
–25 0
50 100 125
0.791
0.786
TEMPERATURE (°C)
–50 –25
0.95
0.99
0
50
75
3501 G03
0.97
1.03
1.01
25
100
125
TEMPERATURE (°C)
–50
VOLTAGE (V)
2.0
2.5
25 75
3501 G04
1.5
1.0
–25 0
50 100 125
0.5
0
MINIMUM INPUT
VOLTAGE
SHUTDOWN
THRESHOLD
VOLTAGE
TEMPERATURE (°C)
–50
CURRENT (µA)
14
25
3501 G05
8
4
–25 0 50
2
0
12
10
6
75 100 125
V
VIN1
V
VIN2
TEMPERATURE (°C)
–50
2.0
2.2
2.6
2.8
3.0
3.4
0
50
75
3501 G06
2.4
3.6
3.8
3.2
–25
25
100
125
IND to V
OUT
Maximum Current
vs Temperature
TEMPERATURE (°C)
–50
3.0
3.2
3.6
3.8
4.0
4.4
0
50
75
3501 G07
3.4
4.6
4.8
4.2
–25
25
100
125
V
OUT
= 5V
V
OUT
= 0V
elecTrical characTerisTics
