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AS1359-BTTT-30 Datasheet(PDF) 11 Page - ams AG |
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AS1359-BTTT-30 Datasheet(HTML) 11 Page - ams AG |
11 / 17 page www.austriamicrosystems.com Revision 1.5 10 - 16 AS1358 / AS1359 Datasheet - Application In form atio n 9.3 Power Dissipation Maximum power dissipation (PD) of the LDO is the sum of the power dissipated by the internal series MOSFET and the quiescent current required to bias the internal voltage reference and the internal error amplifier, and is calculated as: Watts (EQ 3) Internal power dissipation as a result of the bias current for the internal voltage reference and the error amplifier is calculated as: Watts (EQ 4) Total LDO power dissipation is calculated as: Watts (EQ 5) 9.4 Junction Temperature Under all operating conditions, the maximum junction temperature should not be allowed to exceed 125ºC (unless the data sheet specifically allows). Limiting the maximum junction temperature requires knowledge of the heat path from junction to case ( JCºC/W fixed by the IC manufacturer), and adjustment of the case to ambient heat path ( CAºC/W) by manipulation of the PCB copper area adjacent to the IC position. Figure 20. Package Physical Arrangements Figure 21. Steady State Heat Flow Equivalent Circuit PD MAX Seriespass ILOAD MAX = VIN MAX VOUT MIN – PD MAX Bias VIN MAX IQ = PD MAX Total PD MAX Seriespass PD MAX + Bias = Bond Wire Chip PCB Package Lead Frame SOTxx Package Junction TJ°C Package TC°C PCB/Heatsink TS°C Ambient TA°C Chip Power R JC R CS R SA |
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