CAT32 Datasheet, PDF (3/14 Pages) Catalyst Semiconductor – CMOS White LED Driver

CAT32
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for
prolonged time periods may affect device reliability. All voltages are with respect to ground.
V_IN , LED, SHDN Voltage ....................................... 8V
SW Voltage ........................................................... 20V
RSET Voltage ......................................................... 1V
Junction Temperature ....................................... 125°C
Lead Soldering Temperature (10 secs) ............ 300°C
Storage Temperature .......................... -65°C to 150°C
ESD Rating - Human Body Model .................... 2000V
RECOMMENDED OPERATING CONDITIONS
Parameter
Range
Unit
V_IN
2 to 7
V
Ambient Temperature Range
-40 to +85
°C
Inductor L1
6.8 ±20% typical
µH
Input Capacitor C1
4.7 ±20% typical
µF
Output Capacitor C2
1.0 ±20% typical
µF
I with 1 to 4 LEDs in series
0 to 20
mA
LED
ELECTRICAL SPECIFICATIONS
Over recommended operating conditions unless otherwise specified. TA = 25°C, VIN = 2V and VSHDN = 1.2V.
Symbol
I_Q
I_GND
V_LED
I_LED
Parameter
Quiescent Current
Ground Current in Shutdown
LED Pin Voltage
LED Current Adjust Range
I
Programmed LED Current
LED
I_LED
V_RSET
LED Pin Current Temperature Coefficient
R_SET Pin Voltage
Shutdown Pin Logic High Level
Conditions
V_RSET = 0.2V
V_SHDN = 0V
V_IN < V_OUT, I_LED =15mA
R_SET = 562Ω
R_SET = 750Ω
R_SET = 1.5kΩ
R_SET = 4.53kΩ
I_LED = 15mA
R_SET = 1.5kΩ
Min
5
33
25
12.5
0.85
Typ
0.5
0.05
120
38
30
15
5
-0.01
100
Max
0.7
1
180
40
45
36
17.5
Units
mA
µA
mV
mA
mA
mA/° C
mV
V
Shutdown Pin Logic Low Level
0.25
V
f_SW
Boost Converter Frequency
0.8
1.2
1.6 MHz
I_SWL
Switch Current Limit
400 550 780 mA
V_IN = 2V, I_SW = 100mA
0.7
1.2
Ω
R_SW
Switch Resistance
V_IN = 3V, I_SW = 100mA
0.5
0.9
Ω
Switch Leakage Current
Switch Off, V_SW = 5V
0.01
5
µA
Efficiency
Components shown
on Figure 1
83
%
3
Doc No. 5001, Rev. AC