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| LTC3442 Datasheet, PDF (18/20 Pages) Linear Integrated Systems – Micropower Synchronous Buck-Boost DC/DC Converter with Automatic Burst Mode Operation | |||
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LTC3442
TYPICAL APPLICATIO S
High Current LED Driver with Low/High Current Range for Pulsed
Applications; LED Current is 0.5A with 1.5A Pulse
VIN
2.7V TO
4.2V
10µF
6.3V
R5
7.87k
*OFF ON
3.3µH
SW1
SW2
VIN
VOUT
LTC3442
SHDN/SS
FB
RLIM
VC
RT
BURST
R4
2k
SGND
57.6k
PGND
VOUT
ILED = 500mA/1.5A
1nF
R2
20k
R2
200k
10µF
6.3V
LHXL-PW03
95.3k
1nF
R1
301k
OPEN LED VOLTAGE LIMIT = (R4+R5) ⢠0.95/R4
LOW HI
40.2k
2N7002
R2 = R1/1.5
ILED = 24 ⢠(R1+R2+R3)/(R1 ⢠R3) AMPS
(OR: ILED = 40/R3 + .08)
3442 TA05
* NOTE: THE SHDN/SS VOLTAGE MUST BE NO MORE THAN 0.5V BELOW VIN WHEN ENABLED.
3442fa
18
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