AAT2820 Datasheet, PDF (14/18 Pages) Advanced Analogic Technologies – Triple-Output Charge Pump Regulator

AAT2820
Triple-Output Charge Pump Regulator
PCB footprint, and is non-polarized. Low ESR
ceramic capacitors help maximize charge pump
transient response. Since ceramic capacitors are
non-polarized, they are not prone to incorrect con-
nection damage.
Rectifier Diodes
For the rectifiers, use Schottky diodes with a volt-
age rating of 1.5X the input voltage. The maximum
steady-state voltage seen by the rectifier diodes for
both the positive and negative charge pumps
(regardless of the number of stages) is:
V_RESERVE = V_IN - V_F
The BAT54SDW quad Schottky in an SOT363
(2x2mm) package is a good choice for multiple-
stage charge pump configuration (see evaluation
board schematic in Figure 3).
VIN
VOUT_5V
J5
Stage
2
12
J4
Stage
3
1
2
J3
Stage
4
1
2
VOUT_N
J2
Stage
5
1
2
J1
Stage
6
1
2
GND
GND
A3
2
SN
1
6 ^C11
C23
5
1μF
4
0.1μF
3 ^C10
C22
0.1μF
1μF
BAT54SDW
A2
2
1
6 ^C9
C21
1μF
5
4
0.1μF
3 ^C8
C20
0.1μF
1μF
BAT54SDW
A1
2
1
6 ^C7
C19
1μF
5
4
0.1μF
3 ^C6
C18
0.1μF
1μF
BAT54SDW
C4 C3 C1
1μF 4.7μF 1μF
Enable/PN
123
R1
U1
1 _{DRVP FBN} 16
2 _{DRVN REF} 15
3 _{GND EN/PN} 14
4 _{GND FBP} 13
R2
24.3K
C5
0.1μF
5 _{OUT GND} 12
6 _IN
7 _EN
C+
C-
11
10
C2
8 _{GND GND} 9 1μF
AAT2820
Enable
123
SP
A4
C12 ₃
4
0.1μF
5
C13 ₆
0.1μF
1 ^C24
1μF
2
C25
BAT54SDW 1μF
A5
C14 ₃
4
R4 0.1μF
5
C15 ₆
1
C26
1μF
0.1μF
R3
2
12.1K
C27
BAT54SDW
1μF
A6
C16 ₃
4
0.1μF
5
C17 ₆
C28
1 _1μF
0.1μF
2
C29
BAT54SDW
1μF
C1 Taiyo Yuden LMK212 BJ105KD 1μF 10V X7R 0805
C2 Taiyo Yuden LMK107 BJ105KA 1μF 10V X7R 0603
C3 Taiyo Yuden LMK212 BJ475KD 4.7μF 10V X5R 0805
C5, C9-C14 Taiyo Yuden EMK107 BJ104MA 0.1μF 16V X7R 0603
C6-C8, C15-C17 Taiyo Yuden TMK107 BJ104KA 0.1μF 25V X5R 0603
C20-C27 Taiyo Yuden EMK212 BJ105KG 1μF 16V X7R 0805
C18, C19, C28, C29 Taiyo Yuden TMK212 BJ105KG 1μF 25V X5R 0805
[Optional] C4 Taiyo Yuden LMK212 BJ105KD 1μF 10V X7R 0805
J6
12
Stage
2
J7
12
Stage
3
J8
12
Stage
4
J9
12
Stage
5
J10
12
Stage
6
VOUT_P
GND
Figure 3: AAT2820 Evaluation Board Schematic (Shown With Six Stages).
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2820.2006.04.1.4