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RT9901 Datasheet(PDF) 2 Page - Richtek Technology Corporation

Part # RT9901
Description  4 Channel DC/DC Converters IC with High-Efficiency Step-Up and Step-Down
PDF  19 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9901 Datasheet(HTML) 2 Page - Richtek Technology Corporation

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RT9901
Preliminary
2
DS9901-12 August 2007
www.richtek.com
Typical Application Circuit
Figure 1. Typical Application Circuit from 1-cell Li+ Battery
1-cell Li+ Battery 3.4V to 4.2V
VDD3
ENM
CX
FB3
CPFB
EN1
LX3
COMP1
SS
EN3
EN2
COMP2
COMP3
LX2
VDD2
LBI
LBO
FB1
VDD1
LX1
FB2
4.7
μH
IGBT Driver
5V/50mA
14
20k
30k
4.7nF
1nF
1nF
4.7
μH
3.3V/500mA
Low Battery
Warning Output
(Open Drain)
2
3
32
1
30
15
13
5
64
23
24
21
22
28
27
29
25
26
8
10
20
12
11
17
18
19
9
RT9901
VDDC
22nF
1nF
680k
130k
10
μF x 2
16 7, 31,
Exposed Pad (33)
680k
470k
100pF
150k
10
μF x 4
10
μF
30k
1nF
100pF
200k
220k
4.7μH
1.5V/500mA
VBAT
VBAT
10
μF x 4
10
μF x 4
10
μF
0.1
μF
VBAT
10
μF x 2
10
μF x 2
SS0520
SS0520
SS0520
10
μF
130k
100pF
Chip Enable
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
C1 to C2
C3
C4
C5
C6
C7 to C8
C9
C10
C11
C12
C13 C14
C15
C16
C17 to C20
C21 to C24
C23
C25 to C26
D1
D2
D3
L1
L2
L3
C27 to C30
VBAT
RT9701CB
VIN
EN
VOUT
VOUT
GND
5V/500mA
10uF
Chip Enable
1
2
3
4
5
1
μF



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