AAT1143IJS-0.6-T1 AnalogicTech, AAT1143IJS-0.6-T1 Datasheet - Page 8

• Manufacturer Part Number: AAT1143IJS-0.6-T1
• Description: 1MHz 400mA Step-Down Converter
• Manufacturer: AnalogicTech

Functional Block Diagram
Functional Description
The AAT1143 is a high performance 400mA 1MHz mono-
lithic step-down converter. It has been designed with the
goal of minimizing external component size and optimiz-
ing 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
sion can be programmed with external feedback to any
voltage, ranging from 0.6V to the input voltage. An addi-
8
SwitchReg
TM
EN
Note: For adjustable version, the internal feedback divider is omitted and the FB pin is tied directly
to the internal error amplifier.
IN
, C
OUT
Reference
, and L). The adjustable ver-
Voltage
INPUT
Amp
See note
Err
.
w w w . a n a l o g i c t e c h . c o m
OUT
tional feed-forward capacitor can also be added to the
external feedback to provide improved transient response
(see Figure 1).
At dropout, the converter duty cycle increases to 100%
and the output voltage tracks the input voltage minus
the R
The input voltage range is 2.7V to 5.5V. The converter
efficiency has been optimized for all load conditions,
ranging from no load to 400mA.
The internal error amplifier and compensation provides
excellent transient response, load, and line regulation.
Soft start eliminates any output voltage overshoot when
the enable or the input voltage is applied.
DSON
Logic
1MHz 400mA Step-Down Converter
drop of the P-channel high-side MOSFET.
DH
DL
PRODUCT DATASHEET
VIN
AAT1143
LX
PGND
AGND
1143.2009.02.1.11