Datasheet

10
LT1937
1937f
TYPICAL APPLICATIO S
U
Li-Ion to Five White LEDs Five LED Efficiency
V
IN
SW
LT1937
L
22µH
C
OUT
0.22µF
C
IN
1µF
C
IN
: TAIYO YUDEN JMK107BJ105
C
OUT
: TAIYO YUDEN GMK212BJ224
D: CENTRAL CMDSH-3
L: MURATA LQH3C220
1937 TA03a
V
IN
3V TO 5V
SHDN
R1
4Ω
5k
90k
FB
D
V
DC
DIMMING
GND
LOAD CURRENT (mA)
0
65
EFFICIENCY (%)
70
75
80
85
2468
1937 TA03b
10 12
V
IN
= 3.6V
V
IN
= 3V
TYPICAL APPLICATIO S
U
5V to Seven White LEDs
Seven LED Efficiency
V
IN
SW
LT1937
L
22µH
C
OUT
0.22µF
C
IN
1µF
C
IN
: TAIYO YUDEN JMK107BJ105
C
OUT
: TAIYO YUDEN GMK212BJ224
D: CENTRAL CMDSH-3
L: MURATA LQH3C220
1937 TA04a
V
IN
5V
SHDN
R1
4Ω
5k
90k
FB
D
V
DC
DIMMING
GND
LOAD CURRENT (mA)
0
65
EFFICIENCY (%)
70
75
80
85
510
1937 TA04b
15