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LT3667

3667fb

For more information www.linear.com/LT3667

ELECTRICAL CHARACTERISTICS The

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C. VIN1 = 12V unless otherwise noted. (Note 4)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Reverse Output Current (Note 13)

VOUT2 = 1.2V, VIN1 = VIN2 = VIN3 = 0V

VOUT3 = 1.2V, VIN1 = VIN2 = VIN3 = 0V

µA

Input Reverse Leakage Current LDO2

Input Reverse Leakage Current LDO3 (QFN)

VIN2 = –45V, VIN1 = VIN3 = VOUT2 = 0V

VIN3 = –45V, VIN1 = VIN2 = VOUT3 = 0V

300

µA

Internal Current Limit (Note 12)

VIN2 = 2.2V, VOUT2 = 0V, EN2/ILIM2 Pin Grounded

300

∆VOUT2 = –5%

220

VIN3 = 2.2V, VOUT3 = 0V, EN3/ILIM3 Pin Grounded

300

∆VOUT3 = –5%

220

Externally Programmed Current Limit

REN/ILIM = 31.6k, VOUT2/3 = 5V, VIN2/3 ≥ 5.6V

REN/ILIM = 6.19k, VOUT2/3 = 5V, VIN2/3 ≥ 5.6V

REN/ILIM = 6.19k, VOUT2/3 = 5V, 5.6V ≤ VIN2/3 ≤ 15V

REN/ILIM = 1.54k, VOUT2/3 = 5V, 5.6V ≤ VIN2/3 ≤ 15V

9.5

48.45

176

197

10.5

53.55

230

LDO Disable Threshold

VEN/ILIM Rising

0.9

1.2

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: 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

VIN – VDROP.

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 VOUT 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 VIN = VOUT(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.

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