LTC3805 electrical characteristics Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 3: TJ is calculated from the ambient temperature TA and power may cause permanent damage to the device. Exposure to any Absolute dissipation PD according to the following formula: Maximum Rating condition for extended periods may affect device TJ = TA + (PD • 45°C/W) reliability and lifetime. Note 4: Dynamic supply current is higher due to the gate charge being Note 2: The LTC3805 is tested under pulsed conditions such that TJ ≈ TA. delivered at the switching frequency. The LTC3805E is guaranteed to meet specifications from 0°C to 85°C. Note 5: The LTC3805 is tested in a feedback loop that servos V Specifications over the –40°C to 85°C operating junction temperature FB to the output of the error amplifier while maintaining I range are assured by design, characterization and correlation with TH at the midpoint of the current limit range. statistical process controls. The LTC3805I is guaranteed over the –40°C to 125°C operating junction temperature range, the LTC3805H is guaranteed Note 6: Peak current sense voltage is reduced dependent on duty cycle over the full –40°C to 150°C operating junction temperature range, and and an optional external resistor in series with the SENSE pin. For the LTC3805MP is tested and guaranteed over the full –55°C to 150°C details, refer to Programmable Slope Compensation in the Applications operating temperature range. High junction temperatures degrade Information section. operating lifetimes. Operating lifetime is derated at junction temperatures Note 7: Guaranteed by design. greater than 125°C. Note that the maximum ambient temperature Note 8: Overcurrent threshold voltage is reduced dependent on an consistant with these specifications is determined by specific operating optional external resistor in series with the OC pin. For details, refer to conditions in conjunction with board layout, the rated package thermal Programmable Overcurrent in the Applications Information section. resistance and other environmental factors. 3805fg 4 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration 0rder Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Package Description Revision History Typical Application Related Parts
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