LT3667
5
3667fb
For more information www.linear.com/LT3667
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN1
= 12V unless otherwise noted. (Note 4)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Reverse Output Current (Note 13) V
OUT2
= 1.2V, V
IN1
= V
IN2
= V
IN3
= 0V
V
OUT3
= 1.2V, V
IN1
= V
IN2
= V
IN3
= 0V
5
5
40
40
µA
µA
Input Reverse Leakage Current LDO2
Input Reverse Leakage Current LDO3 (QFN)
V
IN2
= –45V, V
IN1
= V
IN3
= V
OUT2
= 0V
V
IN3
= –45V, V
IN1
= V
IN2
= V
OUT3
= 0V
l
l
300
300
µA
µA
Internal Current Limit (Note 12) V
IN2
= 2.2V, V
OUT2
= 0V, EN2/ILIM2 Pin Grounded 300 mA
∆V
OUT2
= –5%
l
220 mA
V
IN3
= 2.2V, V
OUT3
= 0V, EN3/ILIM3 Pin Grounded 300 mA
∆V
OUT3
= –5%
l
220 mA
Externally Programmed Current Limit R
EN/ILIM
= 31.6k, V
OUT2/3
= 5V, V
IN2/3
≥ 5.6V
R
EN/ILIM
= 6.19k, V
OUT2/3
= 5V, V
IN2/3
≥ 5.6V
R
EN/ILIM
= 6.19k, V
OUT2/3
= 5V, 5.6V ≤ V
IN2/3
≤ 15V
R
EN/ILIM
= 1.54k, V
OUT2/3
= 5V, 5.6V ≤ V
IN2/3
≤ 15V
l
l
l
l
9.5
47
48.45
176
10
51
51
197
10.5
55
53.55
230
mA
mA
mA
mA
LDO Disable Threshold V
EN/ILIM
Rising 0.9 1 1.2 V
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:
Positive currents flow into pins, negative currents flow out of pins.
Minimum and maximum values refer to absolute values.
Note 3: Absolute maximum voltage at the IN1, UVLO1 and EN pins is 60V
for nonrepetitive 1 second transients, and 40V for continuous operation.
Note 4: The LT3667E 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
LT3667I is guaranteed over the full −40°C to 125°C operating junction
temperature range. The LT3667H is guaranteed over the full −40°C to
150°C operating junction temperature range.
Note 5: 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.
Note 6: This is the voltage necessary to keep the internal bias circuitry in
regulation.
Note 7: Current limit guaranteed by design and/or correlation to static test.
Slope compensation reduces current limit at higher duty cycles.
Note 8: This is the minimum voltage
across the boost capacitor needed to
guarantee full saturation of the switch.
Note 9: Dropout voltage is the minimum input-to-output voltage
differential needed for an LDO to maintain regulation at a specified output
current. When an LDO is in dropout, its output voltage will be equal to
V
IN
– V
DROP
.
Note 10: To satisfy minimum input voltage requirements, the LT3667 is
tested and specified for these conditions with an external resistor divider
(80.6k bottom, 422k top) which sets V
OUT
to 5V. The external resistor
divider adds 9.93μA of DC load on the output. This external current is not
factored into GND pin current.
Note 11: GND pin current is tested with V
IN
= V
OUT(NOMINAL)
+ 0.6V and a
current source load. GND pin current increases in dropout.
Note 12: The LT3667 is tested and specified for these conditions with FB2
(FB3) pin connected to the OUT2 (OUT3) pin.
Note 13: Reverse output current is tested with the IN2 (IN3) pin grounded
and the OUT2 (OUT3) pin forced to the rated output voltage. This current
flows into the OUT2 (OUT3) pin and out of the GND pin.
