AAT2146W Datasheet, PDF (16/18 Pages) Skyworks Solutions Inc. – Low-Noise, Fast Transient 600mA Step-Down Converter

DATA SHEET
AAT2146W
Low-Noise, Fast Transient 600mA Step-Down Converter
AAT2146W Losses
P_TOTAL
=
I_O2
·
(R_DS(ON)HS
·
V_O
+ R_DS(ON)LS
V_IN
·
[V_IN
-V_O])
+ (t_sw · f_sw · I_O + I_Q) · V_IN
0.4² · (0.38Ω · 1.8V + 0.30Ω · [4.2V - 1.8V])
=
+ (5ns · 2.0MHz · 0.4A + 150µA) · 4.2V = 70.9mW
4.2V
T_J(MAX) = T_A + Θ_JA · P_LOSS = 85°C + (160°C/W) · 70.9mW = 96.4°C
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
16
202008A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 28, 2012