AAT1126 데이터 시트보기 (PDF) - Skyworks Solutions

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AAT1126

600mA, 1MHz Step-Down Converter

Skyworks Solutions 

for VIN = 2 · VO

I = RMS(MAX)

IO

2

The term

VO

VIN

·

⎛⎝1 -

VO ⎞

VIN ⎠

appears in both the input voltage

ripple and input capacitor RMS current equations and is

a maximum when VO is twice VIN. This is why the input

voltage ripple and the input capacitor RMS current ripple

are a maximum at 50% duty cycle.

DATA SHEET

AAT1126

600mA, 1MHz Step-Down Converter

The input capacitor provides a low impedance loop for

the edges of pulsed current drawn by the AAT1126. Low

ESR/ESL X7R and X5R ceramic capacitors are ideal for

this function. To minimize stray inductance, the capaci-

tor should be placed as closely as possible to the IC. This

keeps the high frequency content of the input current

localized, minimizing EMI and input voltage ripple.

The proper placement of the input capacitor (C2) can be

seen in the evaluation board layout in Figure 2.

Figure 2: AAT1126 Evaluation Board

Top Side.

Figure 3: Exploded View of Evaluation

Board Top Side Layout.

Figure 4: AAT1126 Evaluation Board

Bottom Side.

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

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

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