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| AAT2120_08 Datasheet, PDF (16/19 Pages) Advanced Analogic Technologies – 500mA Low Noise Step-Down Converter | |||
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SwitchRegTM
AAT2120 Losses
PTOTAL
=
IO2
·
(RDS(ON)H
·
VO
+ RDS(ON)L
VIN
·
[VIN
-VO])
+ (tsw · FS · IO + IQ) · VIN
PRODUCT DATASHEET
AAT2120
500mA Low Noise Step-Down Converter
0.22 · (0.59Ω · 1.8V + 0.42Ω · [4.2V - 1.8V])
=
4.2V
+ (5ns · 1.8MHz · 0.2A + 45µA) · 4.2V = 19.71mW
TJ(MAX) = TAMB + ÎJA · PLOSS = 85°C + (50°C/W) · 26.14mW = 86°C
16
www.analogictech.com
2120.2008.02.1.2
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