R1218N021A Datasheet, PDF (9/21 Pages) RICOH electronics devices division – Step-up DC/DC converter for White LED Backlight

R1218x
TYPICAL CHARACTERISTICS
1) Efficiency vs. LED Current (2LED) L:LQH32CN220 (Topt=25°C)
R1218x021A
R1218x021A
VIN=1.8V
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
R1218x021A
VIN=4.2V
4
8
12 16 20
LED Current lLED (mA)
2). Efficiency vs. LED Current (3LED) L: LQH32CN220 (Topt=25°C)
R1218x031A
R1218x031A
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)
9