CAT3612 Datasheet, PDF (3/13 Pages) Catalyst Semiconductor – Programmable 300mA Camera Flash LED Driver

CAT3612
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
(over recommended operating conditions unless specified otherwise) VIN = 3.6 V, EN = High, ambient temperature of 25°C.
Symbol
Parameter
Conditions
Min
Typ
Max
I_Q
Quiescent Current
1x mode, no load
0.5
1.5x mode, no load
3
I_QSHDN
I_LED−ACC
I_LED−DEV
R_OUT
Shutdown Current
LED Current Accuracy
LED Channel Matching
Output Resistance (open loop)
F_OSC
I_{SC_MAX}
I_{IN_MAX}
I_EN/DIM
V_HI
V_LO
Charge Pump Frequency
Output short circuit Current Limit
Input Current Limit
EN/DIM Pin
− Input Leakage
− Logic High Level
− Logic Low Level
V_EN = 0 V
1
5 mA ≤ I_LED ≤ 150 mA
±3
(I_LED − I_LEDAVG) / I_LEDAVG
±3
1x mode, I_OUT = 100 mA
0.4
1.5x mode, I_OUT = 100 mA
2.6
0.8
1
1.3
V_OUT < 0.5 V
60
1x mode, V_OUT > 1 V
350
−1
1
1.3
0.4
T_SD
Thermal Shutdown
165
T_HYS
Thermal Hysteresis
20
V_UVLO
Undervoltage lock out (UVLO) Threshold
2
Table 4. RECOMMENDED EN/DIM TIMING
(For 3 V ≤ VIN ≤ 5.5 V, over full ambient temperature range −40°C to +85°C.)
Symbol
Parameter
Conditions
T_SETP
T_LO
T_HI
T_OFF
T_D
T_DEC
EN/DIM setup from shutdown
EN/DIM program low time
EN/DIM program high time
EN/DIM low time to shutdown
LED current enable
LED current decrement
Min
Typ
Max
10
0.3
200
0.3
1.5
40
0.1
Unit
mA
mA
%
%
W
MHz
mA
mA
mA
V
V
°C
°C
V
Unit
ms
ms
ms
ms
ms
ms
T_SETP
T_HI
T_OFF
EN/DIM
T_D
T_LO
LED
Current
T_DEC
150mA _{145 mA 140 mA}
Shutdown
150 mA
5 mA
0 mA
Figure 2. LED Dimming Timing Diagram
Shutdown
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