RT9903BGQV RICHTEK [Richtek Technology Corporation], RT9903BGQV Datasheet - Page 3

• Manufacturer Part Number: RT9903BGQV
• Description: 4 Channel DC/DC Converters IC with High-Efficiency Step-Up
• Manufacturer: RICHTEK [Richtek Technology Corporation]

Function Block Diagram
DS9903B-07 August 2007
3.3V_Motor
C5 to C8
WLED
10uFx4
(12V)
4.7nF
1.2k
R5
C10
R15
V
10
BATT
500pF
AGND
C11
130k
300k
R2
R3
VDD
10uF
C3
C12
6.8nF
2.2k
R6
SS0520
Chip Enable
10uF
COMP3
1uF
C2
SS0520
COMP1
1nF
C4
D2
C9
C13
56nF
10uF
D1
1.2k
C1
R7
V
BATT
Step-Up
Step-Up
V-Mode
C-Mode
Si2302
4.7uH
L2
PWM
PWM
CH1
CH3
EN3
EN1
C14
4.7nF
Q1
R1
R8
2.7k
10k
R4
4.7uH
L1
LX3
LX1
11
21
16
13
14
12
15
19
23
10
4
9
6
5
7
8
LX3
RT
AGND
PGND
FB3
CS4
EXT4
FB4
EN1
EN2
EN3
EN4
COMP2
COMP3
COMP4
COMP1
V_3.3V
FB3
VDD
17
RT9903B
-
+
V
0.2V
V
REF
FB1
Preliminary
1V
REF
COMP4
C15
4.7uF
COMP2
PGND
FB1
FB2
LX1
LX2
NC
EN4
Step-Up
C-Mode
Step-Up
PWM
V-Mode
CH4
EN2
PWM
CH2
18
20
24
22
1
2, 3
EXT4
10uF
C16
LX2
10uF
C19
CS4
NC
V
BATT
10uA
4.7uH
L3
4.7uH
L4
SS0520
SS0520
2.2uF
C24
5.1M
360k
2.2M
D4
R12
-
+
+
-
D3
R11
R9
FB2
FB4
If -CCD = -6V, D6 = 5.6V_ZD
If -CCD = -8V, D6 = 3.6V_ZD
BAT54WSPT
ZENER
Diode
200k
R10
D6
D5
Protection
1nF
C17
1nF
C20
PGND (Exposed Pad)
Thermal
Oscillator
C21 to C23
Start
10uFx3
Soft
10uF
C18
C25
1uF
8.2k
+12V (+LCD)
R13
RT
RT9903B
+15V (+CCD)
www.richtek.com
10uF
C26
-6V (+CCD)
3