LT1932 Linear Technology, LT1932 Datasheet - Page 12

• Manufacturer Part Number: LT1932
• Description: Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter
• Manufacturer: Linear Technology

2V TO 3V
LT1932
12
TYPICAL APPLICATIO S
1.8V TO 3V
V
IN
V
IN
C1: TAIYO YUDEN JMK212BJ475
C2: TAIYO YUDEN TMK316BJ105
D1: ZETEX ZHCS400
L1: MURATA LQH3C4R7M24
CONTROL
C1: TAIYO YUDEN JMK212BJ475
C2: TAIYO YUDEN EMK212BJ105
D1: ZETEX ZHCS400
L1: MURATA LQH3C4R7M24
DIMMING
C1
4.7 F
CONTROL
DIMMING
2-Cell Driver for Four White LEDs
2-Cell Driver for Five White LEDs
C1
4.7 F
PWM
PWM
5
5
SHDN
R
V
SET
IN
SHDN
R
6
4
V
R
1.50k
SET
IN
LT1932
4.7 H
SET
6
4
R
1.50k
L1
LT1932
4.7 H
SET
L1
GND
SW
LED
GND
SW
1
2
LED
U
1
2
[phone]
[phone]
[phone]
[phone]
D1
3
[phone]
[phone]
[phone]
[phone]
D1
3
15mA
15mA
1932 TA05a
C2
1 F
1932 TA07a
C2
1 F
85
80
75
70
65
60
55
85
80
75
70
65
60
55
0
0
5
5
LED CURRENT (mA)
LED CURRENT (mA)
Efficiency
Efficiency
V
IN
= 3V
10
10
V
IN
= 2V
V
V
IN
IN
= 1.8V
15
15
= 3V
1932 TA07b
1932 TA05b
20
20