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APS1056 Datasheet(PDF) 9 Page - Advanced Analogic Technologies

Part # APS1056
Description  Fast Transient 600mA Step-Down Converter
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Manufacturer  ANALOGICTECH [Advanced Analogic Technologies]
Direct Link  http://www.analogictech.com
Logo ANALOGICTECH - Advanced Analogic Technologies

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APS1056
Fast Transient 600mA Step-Down Converter
APS1056.2007.04.0.9 (PRELIMINARY INFORMATION)
9
Functional Block Diagram
EN
LX
Err
.
Amp
Logic
DH
DL
GND
VIN
OUT
Voltage
Reference
INPUT
See note
Note: For adjustable version, the internal feedback divider is omitted and the OUT pin is tied directly
to the internal error amplifier.
Functional Description
The APS1056 is a high performance 600mA
1.4MHz monolithic step-down converter. It has
been designed with the goal of minimizing external
component size and optimizing efficiency over the
complete load range. Apart from the small bypass
input capacitor, only a small L-C filter is required at
the output. Typically, a 4.7µH inductor and a 4.7µF
ceramic capacitor are recommended (see table of
values).
The fixed output version requires only three external
power components (C
IN,
C
OUT,
and L). The
adjustable version can be programmed with external
feedback to any voltage, ranging from 0.6V to the
input voltage. An additional feed-forward capacitor
can also be added to the external feedback to pro-
vide improved transient response (see Figure 1).
At dropout, the converter duty cycle increases to
100% and the output voltage tracks the input volt-
age minus the R
DSON drop of the P-channel high-
side MOSFET.
The input voltage range is 2.7V to 5.5V. The con-
verter efficiency has been optimized for all load
conditions, ranging from no load to 600mA.
The internal error amplifier and compensation pro-
vides excellent transient response, load, and line
regulation. Soft start eliminates any output voltage
overshoot when the enable or the input voltage is
applied.


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