R1218XXX1A RICOH [RICOH electronics devices division], R1218XXX1A Datasheet - Page 9

• Manufacturer Part Number: R1218XXX1A
• Description: Step-up DC/DC converter for Whilte LED Backlight
• Manufacturer: RICOH [RICOH electronics devices division]

3. Efficiency vs. ILED (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
R1218X031A
4
4
4
LED Current I
LED Current I
R1218X041A
LED 電流 I
R1218X041A
8
8
8
LED
LED
LED
12
12
(mA)
12
(mA)
(mA)
16
16
16
V
V
V
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 I
R1218X041A
8
LED
12
(mA)
16
V
IN
=3.6V
R1218X
20
9