sc604a Semtech Corporation, sc604a Datasheet - Page 12

• Manufacturer Part Number: sc604a
• Description: Sc604a Low-noise, High-efficiency Regulated White Led Driver
• Manufacturer: Semtech Corporation

POWER MANAGEMENT
Typical Characteristics
2005 Semtech Corp.
3.9
3.8
3.7
3.6
3.5
3.4
3.3
3.2
100
90
80
70
60
50
0
0
Efficiency vs. Load at High Battery
Startup with 4 LEDs at 20 mA
Mode Transition Voltage vs. LED Voltage
5
20
10
Total Load Current [mA]
1X to 1.5X Mode for 4 LEDs
LED Current [mA]
40
15
Vf = 3.6V
Vf = 3.4V
Vf = 3.2V
60
20
VIN = 3.8V
VIN = 4.0V
VIN = 4.2V
80
25
100
30
120
35
12
5
4
3
2
1
0
100
90
80
70
60
50
0
0
OVP Event with LED Open Circuit
Efficiency vs. Load at Low Battery
20
20
Quiescent Current Trend
VIN = 3.4V
VIN = 2.8V
Total Output Current [mA]
Total Load Current [mA]
40
40
Trend for 4 LEDs
60
60
VIN = 3.6V
80
80
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SC604A
100
100
120
120