SC4505 Semtech Corporation, SC4505 Datasheet - Page 14

• Manufacturer Part Number: SC4505
• Description: High Efficiency Boost Converter
• Manufacturer: Semtech Corporation

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POWER MANAGEMENT
Typical Application Circuits
2006 Semtech Corp.
P1
P2
Vin=2.6~4.6V
100
R1
R6
10k
Figure 7a Backlight and Flashlight LED driver for I
10k
R5
Figure 7b Efficiency Curve for Backlight LEDs Driver Application
6.98k
0.33uF
R3
C4
C2
2.2u
83
82
81
80
79
78
1.54k
0
R4
C1
2.2u
2.5
Boost Converter Efficiency vs Input Voltage
( Backlight Mode: 4 LEDs @ I
Analog Ground
16
15
14
13
12
11
10
3
9
IHLP-2525CZ-01-1R5-M-01
VIN
FTO
FL_TRB
EN_FL
EN_BL
IO1SET
IO2SET
AGND
Input Voltage (V)
L1
3.5
Power Ground
14
PGND
PGND
COMP
SC4505
SW
SW
IO2
IO1
VO
0
1
2
3
4
5
6
7
8
4
O1
0
=20m A)
1.47k
12n
R2
C8
O1
=20mA and I
4.5
2
open
C7
10BQ015
D5
1
(Optional)
0
12n
C5
0
C3
2.2uF
O2
5
=100mA
LED: SML-LX0603UWD
(Optional)
0
12n
C6
D1
D2
D3
D4
LED
LED
LED
LED
www.semtech.com
SC4505
D6
D7
D8
D9
LED
LED
LED
LED