Datasheet

13
LT1932
TYPICAL APPLICATIO S
U
Li-Ion Driver for Two White LEDs Efficiency
Li-Ion Driver for Three White LEDs Efficiency
V
IN
SW
D1
15mA
1932 TA08a
L1
6.8µH
V
IN
2.7V TO 4.2V
LT1932
SHDN
C1: TAIYO YUDEN JMK212BJ475 [phone]
C2: TAIYO YUDEN LMK212BJ225 [phone]
D1: ZETEX ZHCS400 [phone]
L1: PANASONIC ELJEA6R8 [phone]
61
4
R
SET
1.50k
3.3V PWM
DIMMING
CONTROL
C1
4.7µF
C2
2.2µF
31.6k
2
35
LED
R
SET
GND
V
IN
SW
D1
15mA
1932 TA09a
L1
6.8µH
V
IN
2.7V TO 4.2V
LT1932
SHDN
C1: TAIYO YUDEN JMK212BJ475 [phone]
C2: TAIYO YUDEN EMK316BJ225 [phone]
D1: ZETEX ZHCS400 [phone]
L1: PANASONIC ELJEA6R8 [phone]
61
4
R
SET
1.50k
3.3V PWM
DIMMING
CONTROL
C1
4.7µF
C2
2.2µF
31.6k
2
35
LED
R
SET
GND
LED CURRENT (mA)
0
55
EFFICIENCY (%)
60
65
70
75
80
85
5101520
1932 TA08b
V
IN
= 4.2V
V
IN
= 2.7V
LED CURRENT (mA)
0
55
EFFICIENCY (%)
60
65
70
75
80
85
5101520
1932 TA09b
V
IN
= 4.2V
V
IN
= 2.7V