LT8685S

4

Rev. 0

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ELECTRICAL CHARACTERISTICS

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 LT8685SR is specified over the –40°C to 150°C operating

junction temperature range. High junction temperatures degrade operating

lifetimes; operating lifetime is derated for junction temperatures greater

than 125°C. Note the maximum ambient temperature consistent with

these specifications is determined by specific operating conditions in

conjunction with board layout, the rated package thermal impedance and

other environmental factors.

Note 3: This IC includes overtemperature protection that is intended

to protect the device during 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 will reduce lifetime.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Power FET On-resistance

Main Switch (Top)

Synchronous Switch (Bottom)

45

25

mΩ

mΩ

EN3, EN4 Threshold

EN3, EN4 Falling

l

0.78

0.81

0.84

V

EN3, EN4 Hysteresis

50

mV

EN3, EN4 Input Current

–250

0

250

nA

l

4.5

7.5

10

%

l

–10

–7.5

–4.5

%

Pgood Hysteresis

1.2

%

Pgood Leakage

–250

0

250

nA

Pgood Pull-Down Resistance

500

1200

Ω

TRK/SS3, TRK/SS4 Pull-Up Current

2

µA