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AAT2556 Datasheet(PDF) 21 Page - Advanced Analog Technology, Inc.

Part # AAT2556
Description  Battery Charger and Step-Down Converter for Portable Applications
PDF  29 Pages
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Manufacturer  AAT [Advanced Analog Technology, Inc.]
Direct Link  http://www.aatech.com.tw
Logo AAT - Advanced Analog Technology, Inc.

AAT2556 Datasheet(HTML) 21 Page - Advanced Analog Technology, Inc.

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Adjustable Output Resistor Selection
Resistors R3 and R4 of Figure 5 program the out-
put to regulate at a voltage higher than 0.6V. To
limit the bias current required for the external feed-
back resistor string while maintaining good noise
immunity, the suggested value for R4 is 59k
Ω.
Decreased resistor values are necessary to main-
tain noise immunity on the FB pin, resulting in
increased quiescent current. Table 4 summarizes
the resistor values for various output voltages.
With enhanced transient response for extreme
pulsed load application, an external feed-forward
capacitor (C5 in Figure 5) can be added.
Table 4: Adjustable Resistor Values For
Step-Down Converter.
R4 = 59k
Ω
Ω
R4 = 221k
Ω
Ω
VOUT (V)
R3 (k
Ω
Ω)
R3 (k
Ω
Ω)
0.8
19.6
75
0.9
29.4
113
1.0
39.2
150
1.1
49.9
187
1.2
59.0
221
1.3
68.1
261
1.4
78.7
301
1.5
88.7
332
1.8
118
442
1.85
124
464
2.0
137
523
2.5
187
715
3.3
267
1000
⎛⎞
⎝⎠
R3 =
-1 · R4 =
- 1 · 59kΩ = 267kΩ
VOUT
VREF
⎛⎞
⎝⎠
3.3V
0.6V
AAT2556
Battery Charger and Step-Down
Converter for Portable Applications
2556.2006.09.1.2
21
Figure 5: AAT2556 Evaluation Board Schematic.
RED LED
D1
1K
R1
C1
10µF
C2
2.2µF
ADP
R2
8.06K
JP1
0
Ω
BAT
1 2 3
Enable_Buck
JP3
3µH
L1
100pF
C5
C4
4.7µF
VOUT
118k
R3
59k
R4
1 2 3
Buck Input
JP4
1 2
Enable_Bat
JP2
4.7uF
C3
VIN
ISET
5
FB
1
BAT
6
GND
8
GND
2
EN_BUCK
3
STAT
7
EN_BAT
4
ADP
9
GND
10
LX
11
VIN
12
AAT2556
U1
VOUT



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