LT8610AB datasheet(4/28 Pages) AD

4 / 28 page

LT8638S

Rev. 0

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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 LT8638SE 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

LT8638SJ are 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 • JA)

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

Note 3:  values determined per JEDEC 51-7, 51-12. See the 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.

The l denotes the specifications which apply over the full operating

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

ELECTRICAL CHARACTERISTICS

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Spread Spectrum Modulation Frequency

kHz

SS Source Current

1.3

2.0

2.7

µA

SS Pull-Down Resistance

Fault Condition, SS = 0.1V

200

VIN to Disable Forced Continuous Mode

VIN Rising

PHMODE Thresholds

Between 180° and 120°

Between 120° and 90°

0.7

2.2

1.5

2.9

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