AAT1217
600mA, 1.2MHz, Micropower
Synchronous Step-Up Converter
are ideal for high power applications. Large areas of
copper have lower resistance and help to dissipate
heat. The converter's ground should join the system
ground to which it supplies power at one point only.
Figure 1 is the schematic for a highly efficient load
disconnect application circuit for the AAT1217. An
example PCB layout for the AAT1217 is shown in
Figures 2 and 3.
L1
4.7µH
D1
MBR0520
1
SW
Q1
VOUT
VIN 0.85V
Si2305DS
3.3V,100mA
6
5
VIN
VOUT
FB
R4
510kΩ
AAT1217
R1
1.02MΩ
COUT
C
IN
4.7µF
4.7µF
4
3
SHDN
R2
604kΩ
GND
2
R3
510kΩ
Q2
2N3904
ON/OFF Control
Figure 1. AAT1217 High Efficiency Load Disconnect Application Circuit
Figure 2. AAT1217 Evaluation Board Layout
Example Top Layer
Figure 3. AAT1217 Evaluation Board Layout
Example Bottom Layer
1217.2007.07.1.0
11
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