CAT3648 Datasheet, PDF (3/14 Pages) Catalyst Semiconductor – 4-Channel Ultra High Efficiency Quad-Mode™ LED Driver with 32 Dimming Levels

CAT3648
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
(over recommended operating conditions unless specified otherwise) V_IN = 3.6 V, EN = High, T_AMB = 25°C
Symbol
Name
Conditions
Min
Typ
Max
Units
I_Q
Quiescent Current
1x mode, excluding load
1.33x mode, excluding load
1.5x mode, excluding load
2x mode, excluding load
1.0
mA
1.7
2.2
2.4
I_QSHDN
I_LED−ACC
Shutdown Current
LED Current Setting
V_EN = 0 V
RSET = 3.74 kW
RSET = 7.50 kW
1
mA
20
mA
10
I_LED−ACC LED Current Accuracy
(I_LEDAVG – I_NOMINAL) / I_NOMINAL
±2
%
RSET = 4.99 kW
I_LED−DEV
V_RSET
R_OUT
LED Channel Matching
RSET Regulated Voltage
Output Resistance (open loop)
F_OSC
Charge Pump Frequency
(I_LED − I_LEDAVG) / I_LEDAVG
1x mode
1.33x mode, V_IN = 3 V
1.5x mode, V_IN = 2.7 V
2x mode, V_IN = 2.4 V
1.33x and 2x mode
1.5x mode
±1.5
%
0.58
0.6
0.62
V
0.8
W
5
5
10
0.8
1
1.3
MHz
1
1.3
1.6
I_{SC_MAX}
I_{IN_MAX}
LED_TH
Output short circuit Current Limit
Input Current Limit
1x to 1.33x or 1.33x to 1.5x or 1.5x to 2x
Transition Thresholds at any LED pin
V_OUT < 0.5 V
V_OUT > 1 V, 1x mode
50
mA
250
mA
130
mV
V_HYS
T_DF
R_EN/DIM
V_HI
V_LO
T_SD
T_HYS
V_UVLO
1x Mode Transition Hysteresis
Mode Transition Filter Delay
EN/DIM Pin
− Internal Pull−down Resistor
− Logic High Level
− Logic Low Level
Thermal Shutdown
Thermal Hysteresis
Undervoltage lockout (UVLO) threshold
400
mV
120
ms
100
kW
1.3
V
0.4
V
150
°C
20
°C
1.6
1.8
2.0
V
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