LT1937
U
TYPICAL APPLICATIO S
Li-Ion to Five White LEDs
Five LED Efficiency
85
80
75
70
L
D
22µH
V
IN
3V TO 5V
C
C
OUT
0.22µF
IN
1µF
V
DC
DIMMING
V
= 3V
IN
V
SW
FB
IN
90k
LT1937
V
IN
= 3.6V
5k
SHDN
GND
R1
4Ω
65
C
C
: TAIYO YUDEN JMK107BJ105
OUT
IN
1937 TA03a
0
2
4
6
8
10
12
: TAIYO YUDEN GMK212BJ224
LOAD CURRENT (mA)
D: CENTRAL CMDSH-3
L: MURATA LQH3C220
1937 TA03b
Seven LED Efficiency
5V to Seven White LEDs
85
80
75
70
L
D
22µH
V
IN
5V
C
C
IN
OUT
1µF
0.22µF
V
DC
DIMMING
V
IN
SW
FB
90k
LT1937
5k
SHDN
GND
R1
4Ω
65
C
C
: TAIYO YUDEN JMK107BJ105
OUT
IN
1937 TA04a
0
5
10
15
: TAIYO YUDEN GMK212BJ224
LOAD CURRENT (mA)
D: CENTRAL CMDSH-3
L: MURATA LQH3C220
1937 TA04b
1937f
10