LTC7149 datasheet(4/26 Pages) LINER

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LTC7149

7149fa

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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: Transient absolute maximum voltages should not be applied for

more than 4% of the switching duty cycle.

Note 3: Minimum On-time considerations need to be taken into account

when regulating to an output voltage close to zero. Refer to minimum on-

time section in Operations for more details.

Note 4: The LTC7149 is tested under pulsed load conditions such

that TJ ≈TA. The LTC7149E 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

LTC7149I 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.

Note 5: The quiescent current in FC mode does not include switching loss

of the power FETs.

Note 6: 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.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

tPGOOD

PGOOD Delay

PGOOD Low to High

PGOOD High to Low

Switch

Cycles

Switch

Cycles

VVINREG

Input Voltage Regulation Voltage (VINREG + |VOUT–|)

1.85

2.15

IVINREG

VINREG Leakage Current

100

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