SC615A_08 Datasheet, PDF (3/12 Pages) Semtech Corporation – Charge Pump Flash LED Driver

SC615A
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Parameter
Symbol
Conditions
Quiescent Current
I_Q
FLASH high
FLASH low, CTRL high
Flash Mode Pulse
Duration⁽²⁾
Flash Mode
Start-Up Time⁽²⁾
Spotlight Mode
Start-Up Time⁽²⁾
Oscillator Frequency
Oscillator
Frequency Accuracy
Short-Circuit Output
Current Limit
t_FLASH
t_F-ST
t_S-ST
f_OSC
Δf_OSC
I_SC
FLASH low, CTRL low
3.3V < V_IN < 4.2V
I_OUT = 500mA, V_OUT > 2.8V
t = 0 when FLASH goes high to
I_OUT = 90% of final value
t = 0 when CTRL goes high to
I_OUT = 90% of final value
Device Enabled
V_OUT = 0V
Input Current Limit
I_LIMIT
3.3V < V_IN < 4.2V
V_IN = 3.7V, V_OUT = 3.7V, T_A = 25°C
Over-Temperature
T_OT
Protection⁽²⁾
Hysteresis
Logic Input
High Threshold
V_IH
FLASH, CTRL
Logic Input
Low Threshold
V_IL
FLASH, CTRL
Logic Input
High Current
I_IH
FLASH
CTRL
Logic Input
Low Current
I_IL
FLASH, CTRL
ISET Ripple Voltage⁽²⁾
V_PP
Spotlight mode - I_OUT = 200mA
FLASH mode - I_OUT = 500mA
Notes:
(1) V required by the typical LED at this current.
OUT
(2) Guaranteed by design - not tested in production.
Min
Typ
Max Units
3.4
5
mA
2.0
4.5
mA
0.1
2
μA
500
ms
1
ms
1
ms
250
kHz
-15
15
%
465
mA
2.1
A
1.38 1.53
150
°C
10
°C
1.5
V
0.4
V
1
20
35
μA
2
40
70
μA
0.1
2
μA
25
mV
100
© 2008 Semtech Corp.
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