SC618
4
Parameter Symbol Conditions Min Typ Max Units
Flash Mode Pulse Duration
(2)
t
FLASH
3.3V < V
IN
< 4.2V
I
OUT
= 500mA, V
OUT
> 2.8V
500 ms
Flash Mode Start-Up Time
(2)
t
F-SU
t = 0 when FLASH goes high to
I
OUT
= 90% of nal value
1ms
Flash Mode Safety Timer
(2)
t
SAFE
FLASH high 0.90 1.25 s
Spotlight Mode
Start-Up Time
(2,3)
t
S-SU
V
IN
= 4.2V, V
OUT
= 3.2V; t = 0 when CTRL goes high
to I
OUT
= 90% of nal value
1ms
Oscillator Frequency f
OSC
Device enabled 250 kHz
Oscillator Frequency Accuracy
Δf
OSC
-15 15 %
Short-Circuit Output
Current Limit
I
SC
Steady State with VOUT shorted to GND 600 mA
Input Current Limit I
LIMIT
2x mode, 3.3V < V
IN
< 4.2V 2.1
A
2x mode, V
IN
= 3.7V, V
OUT
= 3.7V, T
A
= 25°C 1.38 1.53
Over-Temperature Protection
(2)
T
OT
Rising threshold 150
°C
T
OT -HYS
Hysteresis 10
Logic Input High Threshold V
IH
FLASH, CTRL 1.5 V
Logic Input Low Threshold V
IL
FLASH, CTRL 0.4 V
Logic Input High Current I
IH
FLASH 1 20 35
µA
CTRL 2 40 70
Logic Input Low Current I
IL
FLASH, CTRL 0.1 2.0 µA
ISET Ripple Voltage V
ISET(P-P)
Spotlight mode — I
OUT
= 200mA
25
mV
FLASH mode — I
OUT
= 500mA
100
Electrical Characteristics (continued)
Notes:
1) V
OUT
required by the typical LED at this current.
2) Guaranteed by design - not tested in production.
3) If conditions force 2x mode operation, this start-up time will increase by approximately 32ms due to the timer that is enabled to ensure 2x
mode is needed.
NOT RECOMMENDED FOR NEW DESIGN
NOT RECOMMENDED
FOR NEW DESIGN
