Datasheet LTC7802 (Analog Devices) - 5

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ELECTRICAL CHARACTERISTICS Note 1:
Stresses beyond those listed under Absolute Maximum Ratings lowest output voltage greater than 3.2V and connect EXTVCC to the lowest may cause permanent damage to the device. Exposure to any Absolute output voltage greater than 4.8V Maximum Rating condition for extended periods may affect device
Note 4:
The LTC7802 is tested in a feedback loop that servos VITH1,2 to a reliability and lifetime. specified voltage and measures the resultant VFB1,2. The specification at
Note 2:
The LTC7802 is tested under pulsed load conditions such that TJ ≈ 85°C is not tested in production and is assured by design, characterization TA. The LTC7802E is guaranteed to meet specifications from 0°C to 85°C and correlation to production testing at other temperatures (125°C for the junction temperature. Specifications over the –40°C to 125°C operating LTC7802E/LTC7802I, 150°C for the LTC7802J/LTC7802H). junction temperature range are assured by design, characterization and
Note 5:
Dynamic supply current is higher due to the gate charge being correlation with statistical process controls. The LTC7802I is guaranteed delivered at the switching frequency. See Applications Information. over the –40°C to 125°C operating junction temperature range, and the
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay LTC7802J/LTC7802H are guaranteed over the –40°C to 150°C operating times are measured using 50% levels. junction temperature range. High junction temperatures degrade operating lifetimes; operating lifetime is derated for junction temperatures greater
Note 7:
The minimum on-time condition is specified for an inductor than 125°C. Note that the maximum ambient temperature consistent peak-to-peak ripple current >40% of IL(MAX) (See Minimum On-Time with these specifications is determined by specific operating conditions Considerations in the Applications Information section). in conjunction with board layout, the rated package thermal impedance
Note 8:
This IC includes overtemperature protection that is intended to and other environmental factors. The junction temperature (T protect the device during momentary overload conditions. The maximum J, in °C) is calculated from the ambient temperature (T rated junction temperature will be exceeded when this protection is active. A, in °C) and power dissipation (P Continuous operation above the specified absolute maximum operating D, in Watts) according to the formula: TJ = TA + (PD • θJA), where θJA (in °C/W) is the package thermal impedance. junction temperature may impair device reliability or permanently damage
Note 3:
When SENSE1– ≥ 3.2V or EXTV the device. CC ≥ 4.8V, VIN supply current is transferred to these pins to reduce the total input supply quiescent
Note 9:
Do not apply a voltage or current source to these pins. They must current. SENSE1– bias current is reflected to the channel 1 input supply by be connected to capacitive loads only, otherwise permanent damage the formula I may occur. VIN1 = ISENSE1– • VOUT1/(VIN1 • η), where η is the efficiency. EXTVCC bias current is similarly reflected to the input supply when biased by an output. To minimize input supply current, select channel 1 to be the Rev. 0 For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts