sc1417bimstr Semtech Corporation, sc1417bimstr Datasheet - Page 9

• Manufacturer Part Number: sc1417bimstr
• Description: Sc1417b Micropower, 620 Khz Pwm, Step-up Dc/dc Converter
• Manufacturer: Semtech Corporation

Note:
(1) Value of C1 depends on proximity of input source voltage and source impedance (use C1 > 47µF if the input
supply is greater than two inches from the SC1417B).
POWER MANAGEMENT
Typical Application Circuits
2006 Semtech Corp.
Figure 1 - Constant Brightness LED driver with 12V compliance from 2-cells (constant current output)
VIN = 2V to 5V
VIN
GND
GND
C1
10uF,6.3V
22uF,6.3V
C1
R6
130k
R2
1M
R6
130k
10nF
Figure 2 - Minimum Capacitance Boost Converter
R2
1M
C6
(1)
R3
1M
I
OUT
6
7
3
1
. 1
R5
33k
R
C6
10nF
C3
2.2nF
22
U1
IN
LBI
EN
COMP
4
V
L1
15uH
SC1417B
GND
LBO
FB
LX
6
7
3
1
R5
33k
5
2
8
4
C3
2.2nF
U1
IN
LBI
EN
COMP
D1
SMB5819
L1
15uH
SC1417B
9
GND
LBO
FB
LX
R4
2
8
4
5
D1
SMB5819
4.7uF,16V
1.00M
VOUT
LBO OUT
C2
GND
115k
R1
R4
25 mA out (12V compliant)
Inductor:
Falco P/N SDIP0302-156 [phone]
or
Coilcraft P/N DT1608C-153 [phone]
1uF,16V
R3
1M
VOUT = 12V, 75mA
C2
ENABLE
LBO OUT
GND
LED,3.5V
LED,3.5V
LED,3.5V
SC1417B
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