R1218K021A RICOH [RICOH electronics devices division], R1218K021A Datasheet - Page 10

• Manufacturer Part Number: R1218K021A
• Description: Step-up DC/DC converter for White LED Backlight
• Manufacturer: RICOH [RICOH electronics devices division]

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