Datasheet

16
LT1932
 LINEAR TECHNOLOGY CORPORATION 2001
1932i LT/TP 0701 1.5K • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com
RELATED PARTS
PART NUMBER DESCRIPTION COMMENTS
LT1615 Micropower DC/DC Converter in 5-Lead ThinSOT 20V at 12mA from 2.5V Input, ThinSOT Package
LT1617 Micropower Inverting DC/DC Converter in 5-Lead ThinSOT –15V at 12mA from 2.5V Input, ThinSOT Package
LT1618 Constant-Current/Constant-Voltage DC/DC Converter Drives 20 White LEDs from Li-Ion, MS10 Package
LTC1682 Doubler Charge Pump with Low Noise Linear Regulator 3.3V and 5V Outputs with 60µV
RMS
Noise, Up to 80mA Output
LT1930 1.4MHz Switching Regulator in 5-Lead ThinSOT 5V at 480mA from 3.3V Input, ThinSOT Package
LT1931 Inverting 1.2MHz Switching Regulator in 5-Lead ThinSOT –5V at 350mA from 5V Input, ThinSOT Package
LTC3200 Low Noise Regulated Charge Pump 5V Output with Up to 100mA Output
U
TYPICAL APPLICATIO
Li-Ion Driver for Ten White LEDs Efficiency
V
IN
SW
D1
30mA
1932 TA16a
L1
10µH
V
IN
2.7V TO 4.2V
LT1932
SHDN
C1: TAIYO YUDEN JMK212BJ475 [phone]
C2: TAIYO YUDEN TMK325BJ475 [phone]
D1: ZETEX ZHCS400 [phone]
L1: MURATA LQH3C100M24 [phone]
61
4
R
SET
750Ω
C1
4.7µF
C2
4.7µF
2
3
100Ω
5
LED
R
SET
GND
100Ω
TOTAL LED CURRENT (mA)
0
50
EFFICIENCY (%)
55
60
65
70
75
80
10 20 3051525
1932 TA16b
V
IN
= 4.2V
V
IN
= 2.7V
EfficiencyLi-Ion Driver for Six White LEDs
V
IN
SW
D1
15mA
1932 TA12a
L1
4.7µH
V
IN
2.7V TO 4.2V
LT1932
SHDN
61
4
R
SET
1.50k
3.3V DC
DIMMING
CONTROL
C1
4.7µF
C2
1µF
80.6k
2
35
LED
R
SET
GND
C1: TAIYO YUDEN JMK212BJ475 [phone]
C2: TAIYO YUDEN TMK316BJ105 [phone]
D1: ZETEX ZHCS400 [phone]
L1: MURATA LQH3C4R7M24 [phone]
LED CURRENT (mA)
0
55
EFFICIENCY (%)
60
65
70
75
80
85
5101520
1932 TA12b
V
IN
= 4.2V
V
IN
= 2.7V