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CAT3644
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
(over recommended operating conditions unless specified otherwise) V IN = 3.6 V, EN = High, T AMB = 25 ° C.
Symbol
I Q
Name
Quiescent Current
Conditions
1x mode, no load
Min
Typ
1.0
Max
Units
mA
1.33x mode, no load
1.5x mode, no load
2x mode, no load
1.7
2.2
2.4
I QSHDN
I LED ? ACC
Shutdown Current
LED Current Accuracy
V EN = 0 V
(I LEDAVG – I NOMINAL ) / I NOMINAL
± 2
1
m A
%
RSET = 5 k W
I LED ? DEV
LED Channel Matching
(I LED ? I LEDAVG ) / I LEDAVG
± 1.5
%
V RSET
R OUT
RSET Regulated Voltage
Output Resistance (open loop)
1x mode
0.58
0.6
0.8
0.62
V
W
1.33x mode, V IN = 3 V
1.5x mode, V IN = 2.7 V
2x mode, V IN = 2.4 V
5
5
10
F OSC
Charge Pump Frequency
1.33x and 2x mode
0.8
1
1.3
MHz
1.5x mode
1
1.3
1.6
I SC_MAX
I IN_MAX
LED TH
V HYS
T DF
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
1x Mode Transition Hysteresis
Transition Filter Delay
V OUT < 0.5 V
V OUT > 1 V
50
250
130
400
500
mA
mA
mV
mV
m s
EN/DIM Pin
R EN/DIM
V HI
V LO
T SD
T HYS
? Internal Pull ? down Resistor
? Logic High Level
? Logic Low Level
Thermal Shutdown
Thermal Hysteresis
1.3
100
150
20
0.4
k W
V
V
° C
° C
V UVLO
Undervoltage lockout (UVLO) threshold
1.6
1.8
2.0
V
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