SC4505 Ver la hoja de datos (PDF) - Semtech Corporation
Número de pieza
componentes Descripción
Fabricante
SC4505 Datasheet PDF : 15 Pages
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SC4505
POWER MANAGEMENT
Typical Application Circuits
P1 Vin=2.6~4.6V
P2
R1
10 0
C2
2.2 u
C1
2.2 u
0
0.33uF
C4
R6
R5
10k 10k
R3
6.98k
R4
1.54k
L1
IHLP-252 5CZ-01- 1R5 -M-01
10BQ01 5
D5
2
1
C3
2.2uF
1 6 V IN
15 FTO
1 4 FL_TRB
1 3 EN_FL
1 2 EN_ BL
1 1 IO1SET
1 0 IO2SET
9 AGND
SC4505
PGND 1
PGND 2
SW 3
SW 4
VO 5
IO2 6
IO1 7
COMP 8
0
Analog Ground Power Ground
0
R2
3.01k
C8
12 n
C7
ope n
0
C5
12 n
(Op tiona l)
LED: SML-LX0603UWD
D1
LED
D6
LED
D2
LED
D3
LED
D4
LED
D7
LED
D8
LED
D9
LED
C6
12 n
(Op tiona l)
0
0
Figure 7a Backlight and Flashlight LED driver for IO1=20mA and IO2=100mA
Boost Converter Efficiency vs Input Voltage
( Backlight Mode: 4 LEDs @ IO1=20m A)
83
82
81
80
79
78
2.5
3
3.5
4
4.5
5
Input Voltage (V)
2007 Semtech Corp.
Figure 7b Efficiency Curve for Backlight LEDs Driver Application
14
www.semtech.com
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