CAT37TDI-GT3 CATALYST SEMICONDUCTOR, CAT37TDI-GT3 Datasheet - Page 9

• Manufacturer Part Number: CAT37TDI-GT3
• Description: LED DR, BOOST, 4 LED, SER
• Manufacturer: CATALYST SEMICONDUCTOR

Specifications of CAT37TDI-GT3

• Led Driver Application: Color LCD And Keypad Backlighting, Digital Cameras
• Topology: Boost
• No. Of Outputs: 1
• Input Voltage: 2.5V To 7V
• Dimming Control Type: PWM
• Operating Temperature Range: -40°C To +85°C

3 V to 4.2 V
VIN
3 V to 4.2 V
VIN
3 V to 4.2 V
VIN
Figure 19. Three LEDs with DC Level Dimming Control
Figure 17. Two LEDs with DC Level Dimming Control
Figure 21. Four LEDs with PWM Dimming Control
1 mF
1 mF
1 mF
C1
C1
C1
4
4
4
5
VIN
SHDN
SHDN
5
VIN
SHDN
5
VIN
CAT37
6.8 mH
GND
CAT37
6.8 mH
6.8 mH
CAT37
L1
GND
GND
L1
2
L1
2
2
SW
SW
FB
SW
1
FB
FB
1
1
PWM
Dimming
3
Dimming
V
3
D1
3
D1
V
DC
0.1 mF
10 kW
180 kW
DC
D1
180 kW
10 kW
180 kW
10 kW
10 kW
TYPICAL APPLICATION CIRCUITS
6.34 W
R1
6.34 W
R1
6.34 W
R1
15 mA
15 mA
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15 mA
1 mF
1 mF
C2
1 mF
C2
C2
9
90
85
80
75
70
65
60
90
85
80
75
70
65
60
90
85
80
75
70
65
60
0
0
0
Figure 20. Efficiency − Three LEDs
Figure 22. Efficiency − Four LEDs
5
Figure 18. Efficiency − Two LEDs
5
5
LED CURRENT (mA)
LED CURRENT (mA)
LED CURRENT (mA)
10
10
10
VIN = 3.6 V
VIN = 3.0 V
VIN = 3.6 V
VIN = 3.0 V
15
15
15
VIN = 3.6 V
VIN = 3.0 V
20
20
20
25
25
25
30
30
30