R1218N021A Datasheet, PDF (10/21 Pages) RICOH electronics devices division – Step-up DC/DC converter for White LED Backlight

R1218x
100
90
80
70
60
50
40
30
20
10
0
0
R1218x031A
VIN=4.2V
4
8
12 16 20
LED Current lLED (mA)
3) Efficiency vs. LED Current (4 LED ) L: LQH32CN220 (Topt=25°C)
R1218x041A
R1218x041A
VIN=2.7V
VIN=3.6V
100
100
90
90
80
80
70
70
60
60
50
50
40
40
30
30
20
20
10
10
0
0
4
8
12 16 20
LED Current lLED (mA)
0
0
4
8
12 16 20
LED Current lLED (mA)
100
90
80
70
60
50
40
30
20
10
0
0
R1218x041A
VIN=4.2V
4
8
12 16 20
LED Current lLED (mA)
10