LT8640AJUDCMPBF datasheet(4/28 Pages) AD

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LT8640A

Rev. 0

For more information www.analog.com

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 LT8640AJ 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 (TJ, in °C) is calculated from

the ambient temperature (TA in °C) and power dissipation (PD, in Watts)

according to the formula:

TJ = TA + (PD • θJA)

where θJA (in °C/W) is the package thermal impedance.

The l denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at TA = 25°C.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Spread Spectrum Modulation

Frequency Range

RT = 60.4k, VSYNC = 3.3V

Spread Spectrum Modulation Frequency

VSYNC = 3.3V

kHz

TR/SS Source Current

1.2

1.9

2.6

µA

TR/SS Pull-Down Resistance

Fault Condition, TR/SS = 0.1V

200

VIN to Disable Forced Continuous Mode

VIN Rising

Note 3: JEDEC board θ values are determined per JESD51 conditions.

Demo board θ values are obtained with demo board. See Applications

Information section for information on improving the thermal resistance

and for actual temperature measurements of a demo board in typical

operating conditions.

Note 4: This IC includes overtemperature protection that is intended to

protect the device during overload conditions. Junction temperature will

exceed 150°C when overtemperature protection is active. Continuous

operation above the specified maximum operating junction temperature

will reduce lifetime.

LT8640AJUDCMPBF Datasheet(PDF) 4 Page - Analog Devices

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