rt9278 Richtek Technology Corporation, rt9278 Datasheet - Page 3

• Manufacturer Part Number: rt9278
• Description: High Efficiency Boost Converter High Power White Driver
• Manufacturer: Richtek Technology Corporation

1.6V to 3.0V
1.6V to 5V
DS9278-04 August 2007
V
IN
V
IN
20uF
C1
10uF
C1
C2
1.5nF
4.7uH
V
4.7uH
L1
IN
3.3nF
C2
L1
R1
R1
GPIO
3.9k
Figure 5. Synchronous Boost Converter Driver for Dual Output Voltage
GPIO
51k
10uF
C1
Figure 4. Boost-LDO Application for Constant Output Voltage
4
5
8
2
3
EN
LX
COMP
GND
PGND
4
5
8
2
3
L
EN
LX
COMP
GND
PGND
RT9278
Chip Shutdown
RT9278
C
VOUT
Figure 6. Synchronous Boost Converter
LDRI
COMP
VDD
LFB
VOUT
Chip Enable
FB
R
LDRI
VDD
LFB
COMP
FB
10
7
6
1
9
10
7
6
1
9
Preliminary
10
1uF
4
5
9
2
3
C3
10pF
C4
LX
EN
LDRI
LFB
COMP
GND
1uF
C3
10pF
C4
RT9278
150k
470k
R3
R2
PGND
226k
732k
R2
R3
VDD
PVD
V
FB
3.3V/300mA
OUT1
7
1
8
40uF
C5
20uF
C5
1uF
C
C3
510k
R4
FF
510k
AO3403
R4
Q1
AO3403
R1
R2
Q1
110k
887k
R6
40uF
R5
C
OUT
620k
R6
40.2k
R5
V
OUT
22pF
C6
RT9278
22pF
C6
www.richtek.com
30uF
C7
1uF
C7
V
1.8V/150mA
OUT2
3.3V
V
OUT
3