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| AAT1275_08 Datasheet, PDF (17/19 Pages) Advanced Analogic Technologies – Boost Converter with USB Power Switch | |||
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SwitchRegTM
PRODUCT DATASHEET
AAT1275
Boost Converter with USB Power Switch
AAT1275 Losses
IRMS(ON) =
(IPK2 + IPK · IV + IV2) · DMAX =
3
(0.9A2 + 0.9A · 0.2A + 0.2A2) · 0.46 = 0.4A
3
IRMS(OFF) =
(IPK2 + IPK · IV + IV2) · (1 - DMAX) =
3
(0.9A2 + 0.9A · 0.2A + 0.2A2) · (1 - 0.46) = 0.43A
3
PTOTAL = IRMS(ON)2 · (RDS(ON)IN + RDS(ON)N) + IRMS(OFF)2 · (RDS(ON)IN + RDS(ON)P + RDS(ON))
= 0.4A2 · (0.25⦠+ 0.3â¦) + 0.422 · (0.25⦠+ 0.3⦠+ 0.2â¦) = 0.22W
TJ(MAX)
=
PTOTAL
·
θJA
+
TAMB
=
0.22W
·
110°C
W
+
85°C
=
109°C
1275.2008.04.1.7
www.analogictech.com
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