Datasheet

12
LT1932
2-Cell Driver for Five White LEDs
V
IN
SW
D1
15mA
1932 TA05a
L1
4.7µH
V
IN
2V TO 3V
LT1932
SHDN
C1: TAIYO YUDEN JMK212BJ475 [phone]
C2: TAIYO YUDEN TMK316BJ105 [phone]
D1: ZETEX ZHCS400 [phone]
L1: MURATA LQH3C4R7M24 [phone]
61
4
R
SET
1.50k
PWM
DIMMING
CONTROL
C1
4.7µF
C2
1µF
2
35
LED
R
SET
GND
Efficiency
V
IN
SW
D1
15mA
1932 TA07a
L1
4.7µH
V
IN
1.8V TO 3V
LT1932
SHDN
61
4
R
SET
1.50k
PWM
DIMMING
CONTROL
C1
4.7µF
C2
1µF
2
35
LED
R
SET
GND
C1: TAIYO YUDEN JMK212BJ475 [phone]
C2: TAIYO YUDEN EMK212BJ105 [phone]
D1: ZETEX ZHCS400 [phone]
L1: MURATA LQH3C4R7M24 [phone]
2-Cell Driver for Four White LEDs Efficiency
LED CURRENT (mA)
0
55
EFFICIENCY (%)
60
65
70
75
80
85
5101520
1932 TA05b
V
IN
= 3V
V
IN
= 2V
LED CURRENT (mA)
0
55
EFFICIENCY (%)
60
65
70
75
80
85
5101520
1932 TA07b
V
IN
= 3V
V
IN
= 1.8V
TYPICAL APPLICATIO S
U