AAT2789 Datasheet, PDF (17/22 Pages) Advanced Analogic Technologies – Low Noise, High Frequency Dual Step-Down Converter

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PRODUCT DATASHEET
AAT2789
Low Noise, High Frequency Dual Step-Down Converter
Printed Circuit Board Layout Recommendations
Figure 1: AAT2789 Evaluation Board
Component Side Layout.
Figure 2: AAT2789 Evaluation Board
Solder Side Layout.
U1
1
9
L1
OUT1
NC
LX1
VIN
1.5μH
R1
C5
C2
C3
7
11
59K
opt 10μF 10μF
VP1
FB1
R2
8
12
59K
VP1 AGND1
C1
10μF
5
VCC1
3
LX2
AAT2789
6 _EN1
FB2 ¹⁵
L2
3.3μH
R3
267K
OUT2
C6
opt
4 _{VP2 AGND2} 16
R4
C4
59K
10μF
13 _{VCC2 PGND1 10}
14
2
EN2 PGND2
TDFN34-16
Figure 3: AAT2789 Evaluation Board Schematic.
Symbol
U1
C1, C2, C3, C4
C5
C6
L1
L2
R1-R4
Part Number
AAT2789
GRM188R60J106ME47D
Generic
Generic
LQM2HPN1R5MG0
TFC252008MBT
Generic
Description
AnalogicTech 2-Output Buck TDFN34-16
Cap, MLC, 10uF/6.3V, 0603 ( H_MAX=0.9mm), Murata
Cap,10nF/6.3V,0402
Cap,100pF/6.3V,0402
1.5uH, I_SAT=3A, 2x2.5x0.9mm (H_MAX=0.95mm), shielded chip inductor, Murata
3.3uH, I_SAT=0.52A, 2x2.5x1mm (H_MAX=1.0mm), non-shielded chip inductor, TDK
Carbon Film resistor, 0402
Table 1: AAT2789 Bill of Materials.
Qty
1
4
1
1
1
1
1
2789.2008.03.1.0
www.analogictech.com
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