CAT3643 Datasheet, PDF (3/17 Pages) Catalyst Semiconductor – 3-Channel Ultra High Efficiency Quad-Mode TM LED Driver

CAT3643
ABSOLUTE MAXIMUM RATINGS
Parameter
V_IN, LEDx, C1±, C2± voltage
V_OUT voltage
EN/DIM voltage
Storage Temperature Range
Junction Temperature Range
Lead Temperature
Rating
Unit
6
V
7
V
6
V
-65 to +160
°C
-40 to +125
°C
300
°C
RECOMMENDED OPERATING CONDITIONS
Parameter
Rating
Unit
V_IN
Ambient Temperature Range
I_LED per LED pin
Total Output Current
2.5 to 5.5
V
-40 to +85
°C
0 to 25
mA
0 to 100
mA
LED Forward Voltage Range
1.3 to 4.3
V
Typical application circuit with external components is shown on page 1.
ELECTRICAL OPERATING CHARACTERISTICS
(over recommended operating conditions unless specified otherwise) V_IN = 3.6V, EN = High, T_AMB = 25°C
Symbol Name
Conditions
Min Typ Max
I_Q
Quiescent Current
1x mode, no load
1.0
1.33 x mode, no load
1.7
1.5x mode, no load
2.2
2x mode, no load
2.4
I_QSHDN
I_LED-ACC
I_LED-DEV
V_RSET
Shutdown Current
LED Current Accuracy
LED Channel Matching
RSET Regulated Voltage
R_OUT Output Resistance (open loop)
V_EN = 0V
I_LEDAVG / I_{LEDAVG-NOMINAL}
(I_LED - I_LEDAVG) / I_LEDAVG
1x mode
1.33x mode, V_IN = 3V
1.5x mode, V_IN = 2.7V
2x mode, V_IN = 2.4V
1
±2
±1.5
0.58 0.6 0.62
0.8
5
5
10
F_OSC Charge Pump Frequency
1.33x and 2x mode
1.5x mode
0.8
1
1.3
1
1.3 1.6
I_{SC_MAX} Output short circuit Current Limit
V_OUT < 0.5V
50
I_{IN_MAX} Input Current Limit
V_OUT > 1V
250
LED_TH 1x to 1.33x or 1.33x to 1.5x or 1.5x to 2x
Transition Thresholds at any LED pin
130
V_HYS
T_DF
R_EN/DIM
V_HI
V_LO
1x Mode Transition Hysteresis
Transition Filter Delay
EN/DIM Pin
• Internal Pull-down Resistor
• Logic High Level
• Logic Low Level
400
500
100
1.3
0.4
T_SD
T_HYS
V_UVLO
Thermal Shutdown
Thermal Hysteresis
Undervoltage lockout (UVLO) threshold
150
20
1.6 1.8 2.0
Units
mA
mA
mA
mA
µA
%
%
V
Ω
Ω
Ω
Ω
MHz
MHz
mA
mA
mV
mV
µs
kΩ
V
V
°C
°C
V
© 2007 Catalyst Semiconductor, Inc.
3
Characteristics subject to change without notice
Doc. No. 5022, Rev. B