AAT1162 Ver la hoja de datos (PDF) - Skyworks Solutions
Número de pieza
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Fabricante
AAT1162 Datasheet PDF : 19 Pages
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Functional Block Diagram
DATA SHEET
AAT1162
12V, 1.5A Step-Down DC/DC Converter
LDO
AIN
Note 1
FB
Current
Sense Amp +
LDO
-
+
Error
Amp -
+
-
Current
Mode
Comparator
Control
Logic
Reference
EN
IN
LX
PGND
AGND
DGND
COMP
Note 1: For fixed output voltage versions, FB is connecte. d to the
error amplifier through the resistive voltage divider shown.
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.
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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