LT8686S

4

Rev. 0

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ELECTRICAL CHARACTERISTICS The

l

denotes the specifications which apply over the full

operating temperature range, otherwise specifications are at TA = 25°C. VIN1 = VIN2 = 12V, VIN3 = VIN4 = 5V, fSW = 2MHz unless

otherwise specified.

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 LT8686SJ is specified over the –40°C to 150°C operating

junction temperature range. High junction temperatures degrade operating

lifetimes. 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

Channels 3, 4

Feedback Reference Voltage

l

0.786

0.8

0.812

V

Feedback Input Current

l

–100

0

100

nA

VFB3, VFB4 Line Regulation

VVIN1 = 3V to 42V

0.01

%/V

Peak Current Limit

3.5

4

4.5

A

Power MOSFET On-Resistance

Main Switch

Synchronous Switch (Bottom)

ISW3, ISW4 = 0.1A

ISW3, ISW4 = 0.1A

120

65

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

VEN3, VEN4 = 42V

–250

0

250

nA

PGOOD Upper Threshold Offset from VFB3, VFB4 VFB3, VFB4 Rising

l

4.5

7.5

10

%

PGOOD Lower Threshold Offset from VFB3, VFB4 VFB3, VFB4 Falling

l

–10

–7.5

–4.5

%

PGOOD Hysteresis

1.2

%

PGOOD Leakage

VPG3, VPG4 = 6V

–250

0

250

nA

PGOOD Pull-Down Resistance

VPG3, VPG4 = 0.1V

500

1200

Ω

TRK/SS3, TRK/SS4 Pull-Up Current

VTRK/SS3, VTRK/SS4 = 0V

2.0

μA