AAT2113B Datasheet, PDF (20/22 Pages) Skyworks Solutions Inc. – 3.3MHz, Fast Transient 1.5A Step-Down Converter in an 2mm x 2mm Package

DATA SHEET
AAT2113B
3.3MHz, Fast Transient 1.5A Step-Down Converter in an 2mm x 2mm Package
Input Capacitor
For Input Ripple V_PP = 30mV
C_IN =
1
=
V_PP
I_O
- ESR
· 4 · F_S
1
= 5μF; use 4.7μF
30mV _{- 5mΩ · 4 · 3.3MHz}
1.5A
I_RMS =
I_OUT1
2
= 0.75A
P = ESR · (I_RMS)² = 5mΩ · (0.75A)² = 2.8mW
AAT2113B Losses
All values assume 85°C ambient temperature and thermal resistance of 70°C/W in the 8-pin 2x2mm DFN low profile
package.
P_TOTAL = I_OUT2 · R_DS(ON)H + (t_SW · F_SW · I_OUT + I_Q) · V_IN
= 1.5A² · 152mΩ + (5ns · 3.3MHz · 1.5A + 50μA) · 3.3V
= 423mW
T_J(MAX) = T_AMB + Θ_JA · P_LOSS = 85°C + (70°C/W) · 423mW = 115°C
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
20
202003A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 24, 2012