RT9278 데이터 시트보기 (PDF) - Richtek Technology
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RT9278 Datasheet PDF : 13 Pages
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Preliminary
RT9278
VIN
1.6V to 5V
L1 GPIO
4.7uH
C1
10uF
R1 51k
C2
3.3nF
4 EN
VDD 7
RT9278
5 LX
8
VOUT 6
PGND
2 COMP
3 GND
FB 1
LDRI 9
LFB 10
C3
1uF
C4
10pF
R2
732k
R3
226k
C5
20uF
Q1
AO3403
R4
510k
R5
620k
C6
22pF
R6
40.2k
VOUT
3.3V
C7
1uF
Figure 4. Boost-LDO Application for Constant Output Voltage
VIN
1.6V to 3.0V
L1 GPIO
4.7uH
C1
20uF
R1 3.9k
C2
1.5nF
4 EN
VDD 7
RT9278
5 LX
8
VOUT 6
PGND
2 COMP
3 GND
FB 1
LDRI 9
LFB 10
C3
1uF
C4
10pF
VOUT1
3.3V/300mA
R2
470k
R3
150k
C5
40uF
Q1
AO3403
R4
510k
R5
887k
C6
22pF
R6
110k
VOUT2
1.8V/150mA
C7
30uF
Figure 5. Synchronous Boost Converter Driver for Dual Output Voltage
Chip Enable
4 EN
VDD 7
VIN
L
C1
10uF
Chip Shutdown
RCOMP
5
RT9278
LX
9 LDRI
PVD
10 LFB
2 COMP
FB 1
C3
1uF
VOUT
CFF
R2
COUT
40uF
CCOMP
3 GND PGND 8
R1
Figure 6. Synchronous Boost Converter
DS9278-04 August 2007
www.richtek.com
3
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