AAT2510 Datasheet, PDF (15/19 Pages) Advanced Analogic Technologies – Dual 400mA, 1MHz Step-Down DC-DC Converter

DATA SHEET
AAT2510
Dual 400mA, 1MHz Step-Down DC/DC Converter
AAT2510 Losses
The maximum dissipation occurs at dropout where V_IN = 2.7V. All values assume an ambient temperature of 85°C and
a junction temperature of 120°C.
P_TOTAL
=
I_O12
·
(R_DSON(HS)
·
V_O1
+
R_DSON(LS)
·
(V_IN
-V_O1)) + I_O22
V_IN
·
(R_DSON(HS)
·
V_O2
+
R_DSON(LS)
·
(V_IN
-V_O2))
+ (t_sw · F · I_O2 + 2 · I_Q) · V_IN
0.4² · (0.725Ω · 2.5V + 0.7Ω · (2.7V - 2.5V)) + 0.4² · (0.725Ω · 1.8V + 0.7Ω · (2.7V - 1.8V))
=
2.7V
+ 5ns · 1MHz · 0.4A + 60μA) · 2.7V = 240mW
T_J(MAX) = T_AMB + Θ_JA • P_LOSS = 85°C + (50°C/W) • 240mW = 97°C
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