AAT1162 Ver la hoja de datos (PDF) - Skyworks Solutions

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AAT1162

12V, 1.5A Step-Down DC/DC Converter

Skyworks Solutions 

DATA SHEET

AAT1162

12V, 1.5A Step-Down DC/DC Converter

AAT1162 Losses

Total losses can be estimated by calculating the dropout (VIN = VO) losses where the power MOSFET RDS(ON) will be at

the maximum value. All values assume an 85°C ambient temperature and a 140°C junction temperature with the TDFN

37°C/W package.

PLOSS = ILOAD2 · RDS(ON)H = 1.5A2 · 0.158Ω = 0.355W

TJ(MAX) = TAMB + ΘJA · PLOSS = 85°C + (37°C/W) · 355mW = 96.6°C

The total losses are also investigated at the nominal input voltage (12V). The simplified version of the RDS(ON) losses

assumes that the N-channel and P-channel RDS(ON) are equal.

PTOTAL = ILOAD2 · RDS(ON) + [(tsw · FOSC · ILOAD + IQ) · VIN]

= 1.5A2 · 100mΩ + [(5ns · 800kHz · 1.5A + 150µA) · 12V] = 299mW

TJ(MAX) = TAMB + ΘJA · PLOSS = 85°C + (37°C/W) · 299mW = 96°C

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

201998B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013

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