AAT1126 Ver la hoja de datos (PDF) - Skyworks Solutions

Número de pieza

componentes Descripción

Fabricante

AAT1126

600mA, 1MHz Step-Down Converter

Skyworks Solutions 

DATA SHEET

AAT1126

600mA, 1MHz Step-Down Converter

Input Capacitor

Input Ripple VPP = 25mV

1

1

CIN = ⎛ VPP

⎝ IO

- ESR⎞⎠ · 4 · FS

=

⎛ 25mV

⎝ 0.4A

- 5mΩ⎞⎠ · 4 · 1MHz

= 4.75μF

IRMS =

IO

2

= 0.2Arms

P = esr · IRMS2 = 5mΩ · (0.2A)2 = 0.2mW

AAT1126 Losses

PTOTAL

=

IO2

·

(RDSON(HS)

·

VO

+ RDSON(LS)

VIN

·

[VIN

-VO])

+ (tsw · F · IO + IQ) · VIN

0.42 · (0.45Ω · 1.8V + 0.4Ω · [4.2V - 1.8V])

=

4.2V

+ (5ns · 1.0MHz · 0.4A + 50μA) · 4.2V = 76mW

TJ(MAX) = TAMB + ΘJA · PLOSS = 85°C + (150°C/W) · 76mW = 96.4°C

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

16

201976B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 15, 2013

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