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AAT1150 Datasheet(PDF) 9 Page - Advanced Analogic Technologies

Part # AAT1150
Description  1MHz 1A Step-Down DC/DC Converter
Download  17 Pages
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Manufacturer  ANALOGICTECH [Advanced Analogic Technologies]
Direct Link  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

AAT1150 Datasheet(HTML) 9 Page - Advanced Analogic Technologies

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AAT1150
1MHz 1A Step-Down DC/DC Converter
1150.2006.09.1.5
9
Functional Block Diagram
VP = 2.7V- 5.5V
VCC
EN
SGND
PGND
LOGIC
1.0V REF
Temp.
Sensing
OSC
OP. AMP
LX
FB
DH
DL
CMP
1M
Ω
Applications Information
Control Loop
The AAT1150 is a peak current mode buck con-
verter. The inner wide bandwidth loop controls the
peak current of the output inductor. The output
inductor current is sensed through the P-channel
MOSFET (high side) and is also used for short-cir-
cuit and overload protection. A fixed slope com-
pensation signal is added to the sensed current to
maintain stability. The loop appears as a voltage-
programmed current source in parallel with the out-
put capacitor.
The voltage error amplifier output programs the
current loop for the necessary inductor current to
force a constant output voltage for all load and line
conditions. The feedback resistive divider is inter-
nal, dividing the output voltage to the error amplifi-
er reference voltage of 1.0V. The error amplifier
does not have a large DC gain typical of most error
amplifiers. This eliminates the need for external
compensation components while still providing suf-
ficient DC loop gain for load regulation. The
crossover frequency and phase margin are set by
the output capacitor value only.
Soft Start/Enable
Soft start increases the inductor current limit point in
discrete steps when the input voltage or enable
input is applied. It limits the current surge seen at the
input and eliminates output voltage overshoot. The
enable input, when pulled low, forces the AAT1150
into a low power, non-switching state. The total input
current during shutdown is less than 1μA.


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