Datasheet

LTC3442
18
3442fa
SW1
V
IN
SHDN/SS
R
LIM
R
T
SGND
SW2
V
OUT
FB
V
C
BURST
PGND
LTC3442
V
IN
2.7V TO
4.2V
LHXL-PW03
10µF
6.3V
V
OUT
1nF
3442 TA05
3.3µH
1nF
10µF
6.3V
R5
7.87k
I
LED
= 500mA/1.5A
OPEN LED VOLTAGE LIMIT = (R4+R5) • 0.95/R4
R2 = R1/1.5
I
LED
= 24 • (R1+R2+R3)/(R1 • R3) AMPS
(OR: I
LED
= 40/R3 + .08)
95.3k
40.2k
2N7002
R2
200k
R1
301k
57.6k
R4
2k
R2
20k
*OFF ON
LOW HI
* NOTE: THE SHDN/SS VOLTAGE MUST BE NO MORE THAN 0.5V BELOW V
IN
WHEN ENABLED.
TYPICAL APPLICATIO S
U
TYPICAL APPLICATIO S
U
High Current LED Driver with Low/High Current Range for Pulsed
Applications; LED Current is 0.5A with 1.5A Pulse