CAT3643
ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Unit
V
VIN, LEDx, C1±, C2±, EN/DIM, RSET voltage
VOUT voltage
6
7
V
Storage Temperature Range
Junction Temperature Range
-65 to +160
-40 to +150
°C
°C
RECOMMENDED OPERATING CONDITIONS
Parameter
Rating
Unit
V
VIN
2.5 to 5.5
-40 to +85
up to 30
1.3 to 4.3
Ambient Temperature Range
ILED per LED pin
LED Forward Voltage Range
°C
mA
V
Typical application circuit with external components is shown on page 1.
ELECTRICAL OPERATING CHARACTERISTICS
(over recommended operating conditions unless specified otherwise) VIN = 3.6V, EN = High, TAMB = 25°C
Symbol Name
Conditions
Min
Typ
Max
Units
1x mode, no load
1.33 x mode, no load
1.5x mode, no load
2x mode, no load
1.0
1.7
2.2
2.4
mA
mA
mA
mA
IQ
Quiescent Current
IQSHDN
Shutdown Current
VEN = 0V
1
µA
(ILEDAVG – INOMINAL) / INOMINAL
RSET = 5kꢀ
ILED-ACC LED Current Accuracy
ILED-DEV LED Channel Matching
±2
%
(ILED - ILEDAVG) / ILEDAVG
±1.5
0.6
%
V
VRSET
RSET Regulated Voltage
0.58
0.62
1x mode
0.8
5
5
ꢀ
ꢀ
ꢀ
ꢀ
1.33x mode, VIN = 3V
1.5x mode, VIN = 2.7V
2x mode, VIN = 2.4V
ROUT
Output Resistance (open loop)
10
1.33x and 2x mode
1.5x mode
0.8
1
1
1.3
1.3
1.6
MHz
MHz
FOSC
Charge Pump Frequency
ISC_MAX
IIN_MAX
Output short circuit Current Limit
Input Current Limit
VOUT < 0.5V
VOUT > 1V
50
mA
mA
250
1x to 1.33x or 1.33x to 1.5x or 1.5x to 2x
Transition Thresholds at any LED pin
LEDTH
130
mV
VHYS
TDF
1x Mode Transition Hysteresis
Transition Filter Delay
400
500
mV
µs
EN/DIM Pin
• Internal Pull-down Resistor
• Logic High Level
• Logic Low Level
REN/DIM
VHI
VLO
100
kꢀ
V
V
1.3
1.6
0.4
2.0
TSD
THYS
VUVLO
Thermal Shutdown
150
20
°C
°C
V
Thermal Hysteresis
Undervoltage lockout (UVLO) threshold
1.8
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc. No. MD-5022 Rev. E
CATALYST [ CATALYST SEMICONDUCTOR ]
