cat37tdi-t3 Catalyst Semiconductor, cat37tdi-t3 Datasheet - Page 9

• Manufacturer Part Number: cat37tdi-t3
• Description: Cmos White Led Driver Boost Converter
• Manufacturer: Catalyst Semiconductor

3V to 4.2V
3V to 4.2V
TYPICAL APPLICATION CIRCUITS
©
Characteristics subject to change without notice
Catalyst Semiconductor, Inc.
3V to 4.2V
VIN
VIN
VIN
Three LEDs with DC Level Dimming Control
Two LEDs with DC Level Dimming Control
Four LEDs with PWM Dimming Control
C1
1µF
C1
1µF
C1
1µF
4
4
SHDN
5
VIN
SHDN
5
VIN
4
SHDN
5
VIN
CAT37
6.8µH
CAT37
GND
6.8µH
GND
L1
L1
2
CAT37
2
6.8µH
GND
L1
SW
2
SW
1
FB
1
FB
SW
Dimming
PWM
3
3
FB
1
V
D1
DC
Dimming
10k
18k
3
18k
V
D1
D1
1k
DC
1k
18k
1k
0.1µF
R1
6.34kΩ
15mA
R1
6.34kΩ
15mA
R1
6.34kΩ
15mA
9
C2
1µF
C2
1µF
C2
1µF
90
85
80
75
70
65
60
90
85
80
75
70
65
60
90
85
80
75
70
65
60
0
0
0
Efficiency –- Three LEDs
Efficiency – Four LEDs
Efficiency – Two LEDs
5
5
5
LED CURRENT [mA]
LED CURRENT [mA]
LED CURRENT [mA]
10
10
10
VIN = 3.6V
VIN=3.6V
VIN = 3.0V
VIN=3.0V
VIN = 3.0V
VIN = 3.6V
VIN = 3.6V
VIN = 3.0V
VIN=3.6V
VIN = 3.6V
VIN = 3.0V
15
15
15
Doc. No. MD-5005 Rev. T
VIN=3.0V
20
20
20
CAT37
25
25
25
30
30
30