SC1417B Datasheet, PDF (9/11 Pages) Semtech Corporation – MicroPower, 620kHz PWM, Step-up DC/DC Converter

SC1417B
POWER MANAGEMENT
Typical Application Circuits⁽¹⁾
VIN
GND
R2
R3
1M
1M
C1
22uF,6.3V
R6
130k
C6
10nF
L1
15uH
D1
SMB5819
U1
6 _IN
LX ⁵
7 _LBI
FB ²
3 _EN
LBO ⁸
1 _{COMP GND} 4
SC1417B
R5
33k
R4
C3
2.2nF
I_OUT
=
1.22V
R4
25 mA out (12V compliant)
VOUT
LED,3.5V
LED,3.5V
LBO OUT
LED,3.5V
C2
4.7uF,16V
Inductor:
Falco P/N SDIP0302-156 [phone]
or
GND _{Coilcraft P/N DT1608C-153 [phone]}
Figure 1 - Constant Brightness LED driver with 12V compliance from 2-cells (constant current output)
VIN = 2V to 5V
D1
VOUT = 12V, 75mA
L1
SMB5819
15uH
R2
1M
C1
10uF,6.3V
R6
130k
GND
C6
10nF
U1
6 _IN
LX ⁵
7 _LBI
FB ²
3 _EN
LBO ⁸
1 _{COMP GND} 4
SC1417B
R5
33k
C3
2.2nF
R1
1.00M
R4
115k
1uF,16V
C2
R3
1M
LBO OUT
ENABLE
GND
Figure 2 - Minimum Capacitance Boost Converter
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).
 2006 Semtech Corp.
9
www.semtech.com