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| AAT1230_07 Datasheet, PDF (18/21 Pages) Advanced Analogic Technologies – 18V 100mA Step-Up Converter | |||
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AAT1230/1230-1 Losses
IRMS(ON) = IPEAK ·
DMAX
3
= 1.270
0.834
3
= 0.527A
= 527mA
AAT1230/1230-1
18V 100mA Step-Up Converter
IRMS(OFF) = IPEAK ·
(1 - DMAX)
3
= 1.270
0.166
3
= 0.298A
= 298mA
From datasheet curves, VIN = 3.6V, TCASE = 100°C, TSOPJW-12:
RDS(ON)L = 75mΩ, RDS(ON)IN = 220mΩ, θJA = 160°C/W.
PLOSS(RDSON)
=
I2
RMS(ON)
·
(RDS(ON)L
+
RDS(ON)IN)
+
I2
RMS(OFF)
·
RDS(ON)IN
= 0.5272 (0.220 + 0.075) + 0.2982 · 0.075
= 0.082 + 0.007
= 89mW
TJ(MAX) = TAMB + θJA · PLOSS(RDSON)
= 50 + 160 (0.089)
= 50 + 14.2
= 64.2°C
18
1230.2007.06.1.6
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