SC619_08 Datasheet, PDF (4/13 Pages) Semtech Corporation – Charge Pump Flash LED Driver with Safety Timer

SC619
Electrical Characteristics (continued)
Parameter
Flash Mode Pulse Duration⁽²⁾
Flash Mode Start-Up Time⁽²⁾
Flash Mode Safety Timer⁽²⁾
Spotlight Mode
Start-Up Time^(2,3)
Oscillator Frequency
Oscillator Frequency Accuracy
Short-Circuit Output
Current Limit
Input Current Limit
Over-Temperature Protection⁽²⁾
Logic Input High Threshold
Logic Input Low Threshold
Logic Input High Current
Symbol
Conditions
Min Typ Max Units
t
FLASH
t
F-SU
t
SAFE
3.3V < V < 4.2V
IN
I = 500mA, V > 2.8V
OUT
OUT
t = 0 when FLASH goes high to
I = 90% of final value
OUT
FLASH high
0.90
500
ms
1
ms
1.25
s
V = 4.2V, V = 3.2V; t = 0 when CTRL goes high
t_S-SU
IN
OUT
to I = 90% of final value
OUT
1
ms
f
Device enabled
OSC
250
kHz
Δf_OSC
-15
15
%
I_SC
Steady State with VOUT shorted to GND
600 mA
I
LIMIT
T
OT
T
OT -HYS
V
IH
V
IL
I
IH
2x mode, 3.3V < V < 4.2V
IN
2x mode, V = 3.7V, V = 3.7V, T = 25°C
IN
OUT
A
Rising threshold
Hysteresis
FLASH, CTRL
FLASH, CTRL
FLASH
CTRL
2.1
A
1.38 1.53
150
°C
10
1.5
V
0.4
V
1
20
35
μA
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 = 100mA
OUT
FLASH mode — I_OUT = 500mA
25
mV
100
Notes:
1) V required by the typical LED at this current.
OUT
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.
4