AAT2120 Datasheet, PDF (16/19 Pages) Advanced Analogic Technologies – 500mA Low Noise Step-Down Converter

AAT2120 Losses
P_TOTAL
=
I_O2
·
(R_DS(ON)H
·
V_O
+ R_DS(ON)L
V_IN
·
[V_IN
-V_O])
+ (t_sw · F_S · I_O + I_Q) · V_IN
DATA SHEET
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
T_J(MAX) = T_AMB + Θ_JA · P_LOSS = 85°C + (50°C/W) · 26.14mW = 86°C
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
16
202005A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 24, 2012