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LTM8042/LTM8042-1
TYPICAL APPLICATIONS
Buck-Boost Mode, Driving 5 White LEDs at 500mA with PWM Dimming
V IN
7V TO 17.5V
V CC
LTM8042
LED +
Si2319DS
UP TO 16.3V
RUN
PWM
TGEN
TG
BSTOUT/BKIN
SYNC
SS
BSTIN/BKLED –
1μF
500mA
1μF
RT
GND CTL
19.6k
7.32k
f SW = 850kHz
2.2μF
80421 TA03
Buck Mode, Driving 4 White LEDs at 1A
V IN
19V TO 30V
V CC
LTM8042
LED +
UP TO 13.9V
RUN
PWM
SYNC
TG
BSTOUT/BKIN
BSTIN/BKLED –
TGEN
SS
2.2μF
1A
1μF
RT
GND CTL
4.7μF
15.8k
f SW = 1MHz
80421 TA04
Boost Operation, Driving 9 White LEDs at 100mA
Si2319DS
UP TO 29V
V IN
6V TO 22V
V CC LTM8042-1 LED +
RUN
BSTIN/BKLED –
TG
PWM
TGEN
SYNC
BSTOUT/BKIN
100mA
2.2μF
SS
RT
GND CTL
24.9k
3.4k
f SW = 700kHz
2.2μF
80421 TA05
80421fa
28
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