Datasheet

LM2731"Y"
L1 / 1.5 PH
R3
51K
C1
4.7PF
C2
4.7PF
R2
120
D1
MBR0520
WHITE
LED's
V
IN
SW
FB
GND
SHDN
B1
LI-ION
3.3 - 4.2V
FLASH
ENABLE
0
-+
LM2731 ³;´
SW
FB
GND
V
IN
SHDN
U1
R3
51K
SHDN
GND
3.3 V
IN
C1
2.2PF
R2
13.3K
CF
330pF
D1
MBR0520
R1/84K
L1/10PH
C2
4.7PF
D2
D3
D4
D5
R4
R5
9V OUT
240mA (typ)
Efficiency vs Load Current
EFFICIENCY (%)
LOAD (mA)
0
50
100
150
200
250
0
10
20
30
40
50
60
70
80
90
100
300
3.3 -9V
^y_sŒ•]}v
Efficiency vs Load Current
EFFICIENCY (%)
LOAD (mA)
0
10
20
30
40
50
60
70
80
90
100
0
50
100
150
200
250
3.3 -12V Boost
^z_sŒ•]}v
LM2731 ³<´
SW
FB
GND
V
IN
SHDN
U1
R3
51K
SHDN
GND
3.3 V
IN
C1
2.2PF
R2
13.3K
CF
270pF
D1
MBR0520
R1/117K
L1/6.8PH
C2
10PF
12V
OUT
230mA
(TYP)
TI Confidential - NDA Restrictions
LM2731
SNVS217F –MAY 2004–REVISED NOVEMBER 2012 www.ti.com
Figure 1. White LED Flash Application
Connection Diagram
Top View
Figure 2. 5-Lead SOT-23 Package
See Package Number DBV0005A
2 Submit Documentation Feedback Copyright © 2004–2012, Texas Instruments Incorporated
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