sc1417bimstr Semtech Corporation, sc1417bimstr Datasheet - Page 8

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

POWER MANAGEMENT
Typical Characteristices (Cont.)
Scope plot of Boost Converter waveforms in Constant Brightness LED driver
Vin = 3V, Vout = 11.9V, Iout = 40mA, L = 15uH
Cin = 10uF, 6.3V tant. Cout = 1uF, ceramic, (see above schematic for other components used)
Ch1: Switching Node, Ch2: Vout ripple, Ch4: Current in inductor, (100mA/div)
Inductor current ripple = 170mA pk-pk
2006 Semtech Corp.
90
80
70
60
50
40
1
10
2-Cell to 5V Converter
Load current (mA)
Efficiency
8
100
Vin 3.0V
Vin 2.2V
Vin 1.65V
1000
SC1417B
www.semtech.com