LT8705 datasheet(5/30 Pages) LINER

5 / 30 page

LTC3780

3780ff

For more information www.linear.com/LTC3780

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: TJ for the QFN package is calculated from the temperature TA and

power dissipation PD according to the following formula:

TJ = TA + (PD • 34°C/W)

Note 3: The IC is tested in a feedback loop that servos VITH to a specified

voltage and measures the resultant VOSENSE.

Note 4: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency.

Note 5: Rise and fall times are measured using 10% and 90% levels. Delay

times are measured using 50% levels.

Note 6: The minimum on-time condition is specified for an inductor

peak-to-peak ripple current ≥ 40% of IMAX (see minimum on-time

considerations in the Applications Information section).

Note 7: The LTC3780 is tested under pulsed load conditions such that TJ ≈

TA. The LTC3780E is guaranteed to meet specifications from 0°C to 85°C

junction temperature. Specifications over the –40°C to 85°C operating

junction temperature range are assured by design, characterization and

correlation with statistical process controls. The LTC3780I is guaranteed

over the –40°C to 125°C operating junction temperature range, and

the LTC3780MP is tested and guaranteed over the full –55°C to 125°C

operating junction temperature range.

Note 8: This parameter is guaranteed by design.

Note 9: fOSC is the running frequency for the application.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

PGOOD Output

∆VFBH

PGOOD Upper Threshold

VOSENSE Rising

5.5

7.5

∆VFBL

PGOOD Lower Threshold

VOSENSE Falling

–5.5

–7.5

–10

∆VFB(HYST)

PGOOD Hysteresis

VOSENSE Returning

2.5

VPGL

PGOOD Low Voltage

IPGOOD = 2mA

0.1

0.3

IPGOOD

PGOOD Leakage Current

VPGOOD = 5V

±1

µA

elecTrical characTerisTics The

denotes the specifications which apply over the full operating

junction temperature range, otherwise specifications are at TA = 25°C. (Note 7) VIN = 15V unless otherwise noted.

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