LTC3602 datasheet(4/28 Pages) LINER

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LTC3633A/LTC3633A-1

3633a1f

The

l denotes the speciﬁcations which apply over the full operating

junction temperature range, otherwise speciﬁcations are at TJ = 25°C (Note 2). VIN1 = VIN2 = 12V, unless otherwise noted.

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 LTC3633A is tested under pulsed load conditions such

that TJ ≈ TA. The LTC3633AE is guaranteed to meet speciﬁcations from

0°C to 85°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

LTC3633AI is guaranteed over the full –40°C to 125°C operating junction

temperature range. Note that 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. The junction temperature

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VPHMODE

PHMODE Threshold Voltage

PHMODE VIH

PHMODE VIL

0.3

VMODE/SYNC

MODE/SYNC Threshold Voltage

MODE VIH

MODE VIL

0.4

SYNC Threshold Voltage

SYNC VIH

0.95

IMODE

MODE/SYNC Input Current

MODE = 0V

MODE = INTVCC

1.5

–1.5

μA

(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.

Note 3: This IC includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the speciﬁed maximum operating junction

temperature may impair device reliability.

Note 4: Output voltages outside the speciﬁed range are not optimized for

controlled on-time operation. Refer to the Applications Information section

for further discussions related to the output voltage range.

Note 5: Dynamic supply current is higher due to the internal gate charge

being delivered at the switching frequency.

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