CAT3647 Datasheet, PDF (2/14 Pages) Catalyst Semiconductor – 3-Channel Ultra High Efficiency Quad-Mode™ LED Driver with 32 Dimming Levels

CAT3647
ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
Unit
VIN, LEDx, C1±, C2±, EN/DIM, RSET voltage
6
V
VOUT voltage
7
V
Storage Temperature Range
-65 to +160
°C
Junction Temperature Range
-40 to +150
°C
RECOMMENDED OPERATING CONDITIONS
Parameter
Rating
Unit
VIN
2.5 to 5.5
V
Ambient Temperature Range
I_LED per LED pin
LED Forward Voltage Range
-40 to +85
°C
up to 30
mA
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, excluding load
1.0
1.33 x mode, excluding load
1.7
1.5x mode, excluding load
2.2
2x mode, excluding load
2.4
I_QSHDN
I_LED-ACC
Shutdown Current
LED Current Setting
V_EN = 0V
RSET = 3.74kΩ
RSET = 7.50kΩ
1
20
10
I_LED-ACC LED Current Accuracy
(I_LEDAVG – I_NOMINAL) / I_NOMINAL
RSET = 4.99kΩ
±2
Units
mA
mA
mA
mA
µA
mA
%
I_LED-DEV
V_RSET
LED Channel Matching
RSET Regulated Voltage
R_OUT Output Resistance (open loop)
F_OSC Charge Pump Frequency
(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
1.33x and 2x mode
1.5x mode
±1.5
0.58 0.6 0.62
0.8
5
5
10
0.8
1
1.3
1
1.3
1.6
%
V
Ω
Ω
Ω
Ω
MHz
MHz
I_{SC_MAX}
I_{IN_MAX}
Output short circuit Current Limit
Input Current Limit
V_OUT < 0.5V
V_OUT > 1V, 1x mode
50
mA
250
mA
LED_TH
1x to 1.33x or 1.33x to 1.5x or 1.5x to 2x
Transition Thresholds at any LED pin
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
µs
100
kΩ
1.3
V
0.4
V
150
°C
20
°C
1.6
1.8
2.0
V
Doc. No. MD-5030 Rev. A
2
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice