R1218X Datasheet, PDF (8/14 Pages) RICOH electronics devices division – Step-up DC/DC converter for Whilte LED Backlight

R1218X
TYPICAL CHARACTERISTICS
1) Efficiency vs. ILED( 2LED) L:LQH32CN220 Topt=25°C
100
90
80
70
60
50
40
30
20
10
0
0
R1218X021A
VIN=1.8V
4
8
12
16
20
LED Current ILED (mA)
100
90
80
70
60
50
40
30
20
10
0
0
100
90
80
70
60
50
40
30
20
10
0
0
R1218X021A
VIN=4.2V
4
8
12
16
20
LED Current ILED (mA)
2. Efficiency vs. ILED (3LED) L: LQH32CN220, Topt=25°C
100
R1218X031A
VIN=2.7V
100
90
90
80
80
70
70
60
60
50
50
40
40
30
30
20
20
10
10
0
0
0
4
8
12
16
20
0
LED Current ILED (mA)
R1218X021A
VIN=3.6V
4
8
12
16
20
LED Current ILED (mA)
R1218X031A
VIN=3.6V
4
8
12
16
20
LED Current ILED (mA)
8