AAT1145 Ver la hoja de datos (PDF) - Skyworks Solutions

Número de pieza

componentes Descripción

Fabricante

AAT1145

1.5A Step-Down Converter

Skyworks Solutions 

Input Capacitor

Input ripple VPP = 50mV

1

1

CIN(MIN) = ⎛ VPP

⎝ IO

- ESR⎞⎠ · 4 · fS

=

= 8.9µF; use 10µF

⎛

⎝

0.05

1.5

- 0.01⎞⎠

· 4 · 1.2 · 106

IRMS =

IO

2

= 1.5 = 750mArms

2

PCIN = ESR · IRMS2 = 0.01 · 0.752 = 5.6mW

DATA SHEET

AAT1145

1.5A Step-Down Converter

AAT1145 Losses

PTOTAL = IO2 · RDS(ON)P · D + IO2 · RDS(ON)N · (1 - D) + (tSW · fS · IO) · VIN

1.8

= 1.52 · 0.135 ·

4.2

+ 1.52 · 0.095 · ⎛⎝1 -

1.8⎞

4.2⎠

+

(5

·

10-9

·

1.2

·

106

·

1.5)

·

4.2

=

290mW

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

16

201984B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 18, 2013

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