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Part Name
Description
RT9278 View Datasheet(PDF) - Richtek Technology
Part Name
Description
Manufacturer
RT9278
High Efficiency Boost LDO Converter & High Power White LED Driver
Richtek Technology
RT9278 Datasheet PDF : 13 Pages
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Preliminary
RT9278
V
IN
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
V
OUT
3.3V
C7
1uF
Figure 4. Boost-LDO Application for Constant Output Voltage
V
IN
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
V
OUT1
3.3V/300mA
R2
470k
R3
150k
C5
40uF
Q1
AO3403
R4
510k
R5
887k
C6
22pF
R6
110k
V
OUT2
1.8V/150mA
C7
30uF
Figure 5. Synchronous Boost Converter Driver for Dual Output Voltage
Chip Enable
4
EN
VDD
7
V
IN
L
C1
10uF
Chip Shutdown
R
COMP
5
RT9278
LX
9
LDRI
PVD
10
LFB
2
COMP
FB
1
C3
1uF
V
OUT
C
FF
R2
C
OUT
40uF
C
COMP
3
GND PGND
8
R1
Figure 6. Synchronous Boost Converter
DS9278-04 August 2007
www.richtek.com
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