SC604A
POWER MANAGEMENT
Battery Current Comparison for 4 LEDs at 15mA Each with LED = 3.5V
110
100
90
Competition 1.5x mode
Semtech 1.5x mode
80
70
Semtech 1x mode
60
90% of Li-Ion battery life
3.8 3.7
50
4.2
4.1
4.0
3.9
3.6
3.5
3.4
3.3
3.2
VIN [V]
Efficiency Comparison for 4 LEDs with 15mA Each and LED = 3.5V
100
90
80
70
60
50
40
Semtech 1x mode
Semtech 1.5x mode
Competition 1.5x mode
90% of Li-Ion battery life
4.2
4.1
4.0
3.9
3.6
3.5
3.4
3.3
3.2
3.8VIN [V] 3.7
2005 Semtech Corp.
www.semtech.com
8