ap1521wa Diodes, Inc., ap1521wa Datasheet - Page 7

• Manufacturer Part Number: ap1521wa
• Description: White Led Step-up Converter
• Manufacturer: Diodes, Inc.

White LED Step-Up Converter
Anachip Corp.
www.anachip.com.tw
3.3V To 5V
3.6V To 5V
2.5V~3.3V
Typical Performance Characteristics (Continued)
V
V
V
IN
IN
IN
1uF
1uF
C
C
D: CENTRAL CMDSH-3
L: MURATA LQH3C220
C
C
D: CENTRAL CMDSH-3
L: MURATA LQH3C220
C
C
1uF
C
Not Recommended for New Design
IN
OUT
IN
OUT
C
C
D: CENTRAL CMDSH-3
L: MURATA LQH3C220
IN
IN
: TAIYO YUDEN JMK107BJ105
: TAIYO YUDEN JMK107BJ105
IN
IN
OUT
: AVX 0603YD224
: AVX 0603YD224
: TAIYO YUDEN JMK107BJ105
: AVX 0603YD224
Li-lon to Five White LEDs
Step up DC-DC Regulator
SHDN
SHDN
Li-lon to Six White LEDs
SHDN
V
V
V
IN
IN
IN
AP1521
AP1521
22uH
22uH
AP1521
GND
GND
22uH
GND
L
L
L
SW
SW
SW
FB
FB
FB
Dimming
Dimming
D
D
V
V
D
DC
DC
90k
90k
5k
5k
15K
1K
6.8Ω
6.8Ω
R1
R1
7/8
0.22uF
0.22uF
C
C
V
4.8V
0.22uF
C
OUT
OUT
OUT
OUT
90
85
80
75
70
65
60
84
81
78
75
72
69
66
63
60
57
84
81
78
75
72
69
66
63
60
57
AP1521 Efficiency(%) v.s. LED
AP1521 Efficiency(%) v.s. LED
AP1521 Efficiency(%) v.s. Load
0
0
0
Current (mA)@Vout=4.8V
10
10
10
Current (mA)
Load Current (mA)
LED Current (mA)
Current (mA)
LED Current (mA)
Vin=3.6V
Vin=3.6V
Vin=2.5V
20
20
20
Rev. 0.1 Apr. 27, 2004
AP1521
30
30
30
Vin=4.2V
Vin=4.2V
Vin=5V
Vin=5V
Vin=3.3V
40
40
40
50
50
50