LTC3859AL datasheet(6/38 Pages) LINER

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LTC3899

3899fa

For more information www.linear.com/LTC3899

ELECTRICAL CHARACTERISTICS

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Ratings for extended periods may affect device reliability and

lifetime.

Note 2: The LTC3899 is tested under pulsed load conditions such that

TJ ≈ TA. The LTC3899E is guaranteed to meet performance specifications

from 0°C to 85°C. Specifications over the –40°C to 125°C operating

junction temperature range are assured by design, characterization and

correlation with statistical process controls. The LTC3899I is guaranteed

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

LTC3899H is guaranteed over the –40°C to 150°C operating junction

temperature range, and the LTC3899MP is tested and guaranteed over

the –55°C to 150°C operating junction temperature range. High junction

temperatures degrade operating lifetimes; operating lifetime is derated

for junction temperatures greater than 125°C. 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 (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 = 34°C/W for the QFN package and where θJA = 25°C/W for the

TSSOP package.

Note 3: This IC includes overtemperature protection that is intended to

protect the device during momentary overload conditions. The maximum

rated junction temperature will be exceeded when this protection is active.

Continuous operation above the specified absolute maximum operating

junction temperature may impair device reliability or permanently damage

the device.

Note 4: The LTC3899 is tested in a feedback loop that servos VITH1,2,3 to a

specified voltage and measures the resultant VFB1,2,3. The specification at

85°C is not tested in production and is assured by design, characterization

and correlation to production testing at other temperatures (125°C for

the LTC3899E and LTC3899I, 150°C for the LTC3899H and LTC3899MP).

For the LTC3899I and LTC3899H, the specification at 0°C is not tested in

production and is assured by design, characterization and correlation to

production testing at –40°C. For the LTC3899MP, the specification at 0°C

is not tested in production and is assured by design, characterization and

correlation to production testing at –55°C.

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

delivered at the switching frequency. See Applications information.

Note 6: Rise and fall times are measured using 10% and 90% levels. Delay

times are measured using 50% levels

Note 7: 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 8: Do not apply a voltage or current source to these pins. They must be

connected to capacitive loads only, otherwise permanent damage may occur.

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