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RT9271 Datasheet(PDF) 12 Page - Richtek Technology Corporation

Part # RT9271
Description  White LED Step-Up Converter in Tiny Package
PDF  15 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9271 Datasheet(HTML) 12 Page - Richtek Technology Corporation

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RT9271
12
DS9271-13 March 2007
www.richtek.com
DS(ON)
DS
OUT
DS
OUT
R
Ib
V
Ik
3VFk
V
R6
R5
R4
Ib
V
3VFb
V
R3
×
=
−
=
=
=
−
−
=
(4)
(5)
Figure 10. Constant output voltage for backlight and keypad
Figure 11. Constant output current for backlight and keypad
VCC
EN
GND
LX
FB
RT9271
PWM >22kHz
C1
2.2uF
C3
1uF
D1
SS0520
LX
10uH
R2
5.1k
OVP
V
IN
R1
239k
PWM
+
VFb
-
Ib
R3
R4
+
VFk
-
Ik
R5
Ik
R6
Ik
V
OUT =12V
backlight
keypad
VCC
EN
GND
LX
FB
RT9271
C1
1uF
C3
1uF
LX
10uH
R2
12
OVP
D2
D4
D3
R4
23.7k
R3
10k
D1
SS0520
V
IN
Rdc
100k
Cdc
0.1uF
PWM signal
0V
2.8V
V
FB
V
LED
R5
+
VFk
-
Ik
R6
Ik
R7
Ik
V
OUT
keypad
(6)



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