LTC7802EUFDM-3.3 datasheet(5/34 Pages) AD

5 / 34 page

LTC7802-3.3

Rev. 0

For more information www.analog.com

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 LTC7802-3.3 is tested under pulsed load conditions such

that TJ ≈ TA. The LTC7802E-3.3 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

LTC7802I-3.3 is guaranteed over the –40°C to 125°C operating junction

temperature range, and the LTC7802J-3.30/LTC7802H-3.3 are guaranteed

over the –40°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 (in °C/W) is the package

thermal impedance.

Note 3: When SENSE1– ≥ 3.2V or EXTVCC ≥ 4.8V, VIN supply current

is transferred to these pins to reduce the total input supply quiescent

current. SENSE1– bias current is reflected to the channel 1 input supply by

the formula IVIN1 = ISENSE1– • VOUT1/(VIN1 • η), where η is the efficiency.

EXTVCC bias current is similarly reflected to the input supply when biased

by an output. Input supply current is minimized when EXTVCC is connected

to the lowest output-derived voltage greater than 4.8V.

Note 4: The LTC7802-3.3 is tested in a feedback loop that servos VITH1,2

to a specified voltage and measures the resultant VOUT1, VFB2.

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 IL(MAX) (See Minimum On-Time

Considerations in the Applications Information section).

Note 8: 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 9: 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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