AAT2856_08 Datasheet, PDF (15/18 Pages) Advanced Analogic Technologies – High Current Charge Pump with Dual LDO for Backlight Applications

PRODUCT DATASHEET
AAT2856
ChargePump^TM High Current Charge Pump with Dual LDO for Backlight Applications
Evaluation Board Schematics
DC+
123
J1
VIN
C12
100μF (optional)
100μF lab supply bypass
D1 D2 D3 D4 D5 D6
C3
2.2μF
VOUT
ENA
OUTB
J2
0
28 27 26 25 24 23 22
U1
AAT2856
C8
0.1μF
1 _BL3
2 _BL2
3 _BL1
4 _AGND
5 _AGND
6 _REF
7 _FBB
OUT ²¹
ENS ²⁰
PGND ¹⁹
IN ¹⁸
C2- ¹⁷
C2+ ¹⁶
ENB ¹⁵
C2
1.0μF
C4
4.7μF
8 9 10 11 12 13 14
Programmed for
2.8V output by default
R2
78.7k
C5
2.2μF
R1
59k
C6
2.2μF
VOUT A/B(V)
1.2
1.8
2.8
1.5
2.5
3.3
R4 (Ω), R3 = 59k
R2 (Ω), R1 = 59k
R4 short, R5 open (R2 short, R1 open)
29.4K
78.7K
14.7K
63.4K
105K
C1
1.0μF
R4
29.4k
R3
59k
C7
2.2μF
Programmed for
1.8V output by default
Figure 6: AAT2856 Section Schematic.
VOUT
ENS
ENB
OUTA
2856.2008.02.1.3
www.analogictech.com
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