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RT9902 Datasheet(PDF) 2 Page - Richtek Technology Corporation

Part # RT9902
Description  4 Channel DC/DC Converters IC with High-Efficiency Step-Up and Step-Down
PDF  21 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9902 Datasheet(HTML) 2 Page - Richtek Technology Corporation

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RT9902
Preliminary
2
DS9902-10 August 2007
www.richtek.com
Typical Application Circuit
1-cell Li+ Battery 3V to 4.2V
Figure 1. Typical Application Circuit from 1-cell Li+ Battery
VDD3
ENM
CX
FB3
CPFB
EN1
LX3
COMP1
SS
EN3
EN2
COMP2
COMP3
LX2
VDD2
LFB
LDO_O
FB1
VDD1
LX1
FB2
4.7
μH
IGBT Driver
5V/50mA
14
20k
30k
4.7nF
1nF
1nF
4.7
μH
2.5V/500mA
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
RT9902
VDDC
22nF
1nF
680k
130k
10
μF x 2
16 7, 31
Exposed Pad (33)
510k
470k
100pF
220k
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
150k
100pF
Chip Enable
51k
10
μF x 2
10
μF
470k
150k
SI2301
VIN
3.52V
VOUT
100pF
3.3V/500mA
C1 to C2
C3 to C6
C7
C8
C9 to C10
C11
C12
C13
C14
C15
C16
C17 C18
C19
C20
C21 to C24
C25
C26
C27 to C28
C29 to C30
C31
C32 to C35
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
L1
L2
L3
D1
D2
D3
Q1
VBAT
1
μF
C12



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