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7440530047 データシート(PDF) 9 Page - Skyworks Solutions Inc.

部品番号 7440530047
部品情報  12V, 1.5A Step-Down DC/DC Converter
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メーカー  SKYWORKS [Skyworks Solutions Inc.]
ホームページ  http://www.skyworksinc.com
Logo SKYWORKS - Skyworks Solutions Inc.

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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
AAT1162
12V, 1.5A Step-Down DC/DC Converter
DATA SHEET
Functional Description
The AAT1162 is a current-mode step-down DC/DC con-
verter that operates over a wide 4V to 13.2V input volt-
age range and is capable of supplying up to 1.5A to the
load with the output voltage regulated as low as 0.6V.
Both the P-channel power switch and N-channel syn-
chronous rectifier are internal, reducing the number of
external components required. The output voltage is
adjusted by an external resistor divider; fixed output
voltage versions are available upon request. The regula-
tion system is externally compensated, allowing the cir-
cuit to be optimized for each application. The AAT1162
includes cycle-by-cycle current limiting, frequency fold-
back for improved short-circuit performance, and ther-
mal overload protection to prevent damage in the event
of an external fault condition.
Control Loop
The AAT1162 regulates the output voltage using con-
stant frequency current mode control. The AAT1162
monitors current through the high-side P-channel
MOSFET and uses that signal to regulate the output volt-
age. This provides improved transient response and
eases compensation. Internal slope compensation is
included to ensure the current “inside loop” stability.
Functional Block Diagram
Control
Logic
+
-
LDO
+
-
Reference
Note 1
FB
EN
AGND
DGND
PGND
LX
IN
AIN
LDO
COMP
Note 1: For fixed output voltage versions, FB is connected to the
error amplifier through the resistive voltage divider shown.
.
+
-
Current
Sense Amp
Error
Amp
Current
Mode
Comparator


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