RT9911
V
BAT
V
BAT
3.4V to 4.2V
C1 to C2
10uFx2
L1
4.7uH
C3 to C6
10uFx4
R2 150k
V
BAT
C8 to C9
10uFx2
2.5V
C13
0.1uF
R3
510k
C10 to C11
10uFx2
R5 226k
R4
470k
L2
4.7uH
C12
100pF
33
FB2
VREF 4
9
PGND1
PGND2 29
Bottom PAD
GND
EXT6
CS3
VFB6
CFB6
EN1
EN1
EN3
EN4
EN5
EN6
23
22
35
36
37
38
39
40
6
19
V
BAT
C30
10uF
31
R1
470k
C7
100pF
7
FB1
PVDD2
RT9911
PVDD5
EXT5
RT
15
14
3 R12
11
PVDD1
V
BAT
C22
1uF
34
SELECT
5
VDDM
EXT4
18
C23
10uF
L4
4.7uH
SS0520
D6
Q4
C24
10uF
C25
100pF
R10
2.2M
CCD
12V
20mA
I/O
3.3V
500mA
10 LX1
FB4 17
V
BAT
C26
10uF
Q5
SS0520
D7
FB5
13
C27
100pF
R13
1M
R14
125k
R24
20k
L5
3.3uH
R11 205k
30 LX2
C28
10uF
C29
4.7uF
CCD
-8V
40mA
Q1
DDR
2.5V
250mA
2 OK2
1
GND
20
PVDD3
V
BAT
L6
4.7uH
SS0520
D8
Q6
C31
4.7uF
R15
300k
D1
D2
D3
D4
EN1
EN2
EN3
EN4
EN5
EN6
R16
10
C15 to C16
10uFx2
D5
Motor
5V
500mA
L3
4.7uH
26
C17
10pF
R8
470k
C18
to C21
10uFx4
Q2
25 DRN3
Q3
24
DRP3
28
FB3
COMP1
COMP2
COMP3
COMP4
COMP5
COMP6
R9
90.9k
8
R17 to R23
C32 to C37
32 27 16 12 21
1M
Figure 2. Application Circuit for Li-ion Battery Supply
Note :
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.
Output voltage setting
CH1: 0.8Vx(1+R1/R2) ex: I/O 3.3V = 0.8x(1+470k/150k)
CH2: 0.8Vx(1+R4/R5) ex: DDR 2.5V = 0.8x(1+470k/226k)
CH3: 0.8Vx(1+R8/R9) ex: MOTOR 5V = 0.8x(1+470k/90.9k)
CH4: 1.0Vx(1+R10/R11) ex: CCD 12V = 1.0x(1+2.2M/205k)
CH5: -1.0Vx(R13/R14) ex: CCD -8V = -1.0x(1M/125k)
DS9911-04 August 2007
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3
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