LT3995
3
3995f
For more information www.linear.com/LT3995
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
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 LT3995E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization, and correlation with statistical process controls. The
LT3995I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The LT3995H is guaranteed over the full –40°C to
150°C operating junction temperature range. High junction temperatures
degrade operating lifetimes. Operating lifetime is derated at junction
temperatures greater than 125°C. The junction temperature (T
J
, in °C) is
calculated from the ambient temperature (T
A
, in °C) and power dissipation
(P
D
, in Watts) according to the formula:
T
J
= T
A
+ (P
D
• θ
JA
)
where θ
JA
(in °C/W) is the package thermal impedance.
Note 3: Minimum input voltage depends on application circuit.
Note 4: The LT3995 contains circuitry that extends the maximum duty
cycle if there is sufficient voltage across the boost capacitor. See the
Application Information section for more details.
Note 5: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the switch.
Note 6: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed the maximum operating junction temperature
when overtemperature protection is active. Continuous operation above
the specified maximum operating junction temperature may impair device
reliability or permanently damage the device.
Switch Current Limit V
FB
= 1V 4.7 6.3 7.9 A
Foldback Switch Current Limit V
FB
= 0V 3.1 A
Switch V
CESAT
I
SW
= 1A 100 mV
Switch Leakage Current 0.02 1 μA
Boost Schottky Forward Voltage I
SH
= 100mA 800 mV
Boost Schottky Reverse Leakage V
REVERSE
= 12V 0.02 2 μA
Minimum Boost Voltage (Note 5)
l
1.3 1.8 V
BOOST Pin Current I
SW
= 1A, V
BOOST
– V
SW
= 3V 22 35 mA
EN Voltage Threshold EN Falling, V
IN
≥ 4.3V
l
0.92 1.02 1.12 V
EN Voltage Hysteresis 60 mV
EN Pin Current 0.2 20 nA
PG Threshold Offset from V
FB
V
FB
Falling 5 8.4 13 %
PG Hysteresis as % of Output Voltage 1.7 %
PG Leakage V
PG
= 3V 0.02 1 µA
PG Sink Current V
PG
= 0.4V
l
125 480 μA
SYNC Low Threshold 0.6 1.0 V
SYNC High Threshold 1.18 1.5 V
SYNC Pin Current V
SYNC
= 6V 0.1 nA
SS Source Current V
SS
= 0.5V 0.9 1.8 2.6 μA
