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| AAT2146 Datasheet, PDF (17/19 Pages) Advanced Analogic Technologies – Low Noise, Fast Transient 600mA Step-Down Converter | |||
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SwitchRegTM
PRODUCT DATASHEET
AAT2146
Low Noise, Fast Transient 600mA Step-Down Converter
AAT2146 Losses
PTOTAL
=
IO2
·
(RDSON(HS)
·
VO
+ RDSON(LS)
VIN
·
[VIN
-VO])
+ (tsw · F · IO + IQ) · VIN
0.42 · (0.725Ω · 1.8V + 0.7Ω · [4.2V - 1.8V])
=
4.2V
+ (5ns · 2.0MHz · 0.4A + 70µA) · 4.2V = 131mW
TJ(MAX) = TAMB + ÎJA · PLOSS = 85°C + (160°C/W) · 131mW = 105.9°C
2146.2008.04.1.1
www.analogictech.com
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