Datasheet

16
LT1932
1932f
 LINEAR TECHNOLOGY CORPORATION 2001
LT/TP 1201 2K • 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
LTC3201 Ultralow Noise, Charge Pump 100mA, Integrated LP Filter, MSOP8
LTC3202 High Efficiency, Fractional Charge Pump 125mA, Integrated 2-Bit DAC
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