RT9903GQV RICHTEK [Richtek Technology Corporation], RT9903GQV Datasheet - Page 3

• Manufacturer Part Number: RT9903GQV
• Description: 5 Channel DC/DC Converters IC with High-Efficiency Step-Up
• Manufacturer: RICHTEK [Richtek Technology Corporation]

Function Block Diagram
DS9903-07 August 2007
3.3V_Motor
AGND
C5 to C8
WLED
10uFx4
(12V)
VDD
4.7nF
1.2k
R5
C10
VBATT
R15
10
COMP3
COMP1
500pF
C11
130k
R2
300k
R3
10uF
Step-Up
Step-Up
V-Mode
C-Mode
C3
PWM
PWM
6.8nF
C12
EN1
CH1
CH3
EN3
2.2k
R6
SS0520
Chip Enable
10uF
1uF
C2
SS0520
1nF
C4
D2
C9
LX3
LX1
C13
56nF
10uF
D1
1.2k
C1
R7
VBATT
Si2302
4.7uH
L2
C14
4.7nF
Q1
R1
R8
2.7k
10k
R4
FB3
4.7uH
L1
11
21
16
13
14
12
15
19
23
10
-
+
4
9
6
5
7
8
V
0.2V
V
REF
FB1
LX3
RT
AGND
PGND
FB3
CS4
EXT4
FB4
EN1
EN2
EN3
EN4
COMP2
COMP3
COMP4
1V
COMP1
REF
COMP4
V_3.3V
VDD
COMP2
Preliminary
17
RT9903
EN4
Step-Up
C-Mode
Step-Up
PWM
V-Mode
CH4
EN2
PWM
CH2
C15
4.7uF
EXT4
FB-CP
LX2
INCD
FB1
FB2
LX1
LX2
CX
CS4
10uA
18
20
24
22
2
1
3
10uF
C16
68nF
C24
10uF
-
+
+
-
C19
FB2
FB4
VBATT
VCC
3.3V
4.7uH
L3
SS0520
4.7uH
D6
L4
SS0520
SS0520
SS0520
Charge Pump
2.2M
5.1M
360k
D4
R12
D3
D5
R11
Protection
PGND (Exposed Pad)
R9
Thermal
INCD CX
200k
R10
750k
R14
330k
R13
1uF
C27
1nF
C17
1nF
C20
C21 to C23
10uFx3
Oscillator
Start
Soft
10uFx2
+12V (+LCD)
C28
C25 to C26
10uF
C18
+
-
-7.5V (-CCD)
FBCP
+15V (+CCD)
RT9903
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RT
3