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LP78084 bảng dữ liệu(PDF) 19 Page - Lowpower Semiconductor inc

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Giải thích chi tiết về linh kiện  Total Power solution of Portable Applications 800mA Charge 800mA Buck DC/DC300mA LDO
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LP78084 bảng dữ liệu(HTML) 19 Page - Lowpower Semiconductor inc

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Preliminary Datasheet
LP78084
LP78084 – 02 Ver. 1.1 Datasheet
Nov.-2007
Page 19 of 22
drop in capacitance value as their temperature increase from
25°C, an important consideration. The X5R generally
maintain their capacitance value within ± 20%. The X7R
type are desirable for their tighter tolerance of 10% over
temperature.
Power Dissipation and Junction Temperature
Specified regulator operation is assured to a junction
temperature of 160°C; the maximum junction temperature
should be restricted to 160°C under normal operating
conditions. This restriction limits the power dissipation the
regulator can handle in any given application. To ensure the
junction temperature is within acceptable limits, calculate
the maximum allowable dissipation, PD(max), and the actual
dissipation, PD , which must be less than or equal to PD( m a x )
The maximum-power-dissipation limit is determined using
the following equation:
Where:
TJ M AX is the maximum allowable junction temperature. RJA is
the thermal resistance junction-to-ambient for the package
TA is the ambient temperature.
The regulator dissipation is calculated using:
Power dissipation resulting from quiescent current is negligible.
Excessive power dissipation triggers the thermal protection
circuit.



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