rt9911 Richtek Technology Corporation, rt9911 Datasheet - Page 2

• Manufacturer Part Number: rt9911
• Description: 6 Channel Dc/dc Converters
• Manufacturer: Richtek Technology Corporation

RT9911
Note :
www.richtek.com
2
Typical Application Circuit
Bottom pad is GND pad, can be short to pin 6 (GND).
Please remove Q2 when use Async Boost and remove D5 when use Sync Boost.
500mA
3.3V
I/O
500mA
Motor
5V
V
3.3V
300mA
Q1
CORE
1.8V
VS
3.3V
VS
100pF
C14
R7
90.9k
R1
510k
10uFx4
C3 to C6
10uF
C9
470k
R6
R5
10uFx2
C12 to C13
0.1uF
C8
240k
C11
10uF
10uFx4
470k
C15 to
C18
R2
R4
300k
D5
C1 to C2
10uFx2
Figure 1. Application Circuit for 2-Cells Battery Supply
Q2
150k
R3
100pF
C7
1.8V to 3.2V
4.7uH
100pF
C10
V
4.7uH
L2
L3
BAT
C31 to C36
Q3
R15 to R21
4.7uH
L1
D9
V
BAT
11
10
29 PGND2
30
33
31
20
26
25
24
28
1
7
9
2
DRP3
PVDD1
LX1
FB1
OK2
LX2
FB2
PVDD2
PVDD3
CS3
DRN3
FB3
PGND1
GND
8
32 27 16 12 21
RT9911
34
3.3V
VS
Bottom PAD
5
PVDD5
C19
1uF
VREF
EXT4
EXT5
EXT6
VFB6
CFB6
GND
EN1
EN1
EN3
EN4
EN5
EN6
FB4
FB5
RT
1M
23
18
17
15
14
13
6
19
22
35
36
37
38
39
40
3
4
3.3V
R10
1uF
C23
V
V
EN1
EN2
EN3
EN4
EN5
EN6
V
BAT
BAT
BAT
Q4
Q5
Q6
4.7uH
SS0520
4.7uH
L4
L6
10uF
10uF
C20
C24
SS0520
D6
D8
SS0520
D7
10uF
C29
10uF
100pF
C21
4.7uF
C30
C25
3.3uH
L5
DS9911-04 August 2007
R13
300k
1M
R11
R22
R12
125k
20k
100pF
C22
10
R14
4.7uF
C28
C26 to C27
10uFx2
R8
2.2M
D1
D2
D3
D4
205k
R9
-8V/40mA
CCD
CCD
12V
20mA