Datasheet
LT3494/LT3494A
12
3494fb
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2006
LT 0507 REV B • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LT1613 550mA (I
SW
), 1.4MHz, High Effi ciency Step-Up DC/DC Converter V
IN
: 0.9V to 10V, V
OUT(MAX)
= 34V, I
Q
= 3mA, I
SD
< 1μA,
ThinSOT Package
LT1615/LT1615-1 300mA/80mA (I
SW
), High Effi ciency Step-Up DC/DC Converters V
IN
: 1V to 15V, V
OUT(MAX)
= 34V, I
Q
= 20μA, I
SD
< 1μA,
ThinSOT Package
LT1930/LT1930A 1A (I
SW
), 1.2MHz/2.2MHz, High Effi ciency Step-Up DC/DC
Converters
V
IN
: 2.6V to 16V, V
OUT(MAX)
= 34V, I
Q
= 4.2A/5.5mA, I
SD
< 1μA,
ThinSOT Package
LT1945 (Dual) Dual Output, Boost/Inverter, 350mA (I
SW
), Constant Off-Time, High
Effi ciency Step-Up DC/DC Converter
V
IN
: 1.2V to 15V, V
OUT(MAX)
= ±34V, I
Q
= 40μA, I
SD
< 1μA,
10-Lead MS Package
LT1946/LT1946A 1.5A (I
SW
), 1.2MHz/2.7MHz, High Effi ciency Step-Up DC/DC
Converters
V
IN
: 2.45V to 16V, V
OUT(MAX)
= 34V, I
Q
= 3.2mA, I
SD
< 1μA,
8-Lead MS Package
LT3467/LT3467A 1.1A (I
SW
), 1.3MHz/2.1MHz, High Effi ciency Step-Up DC/DC
Converters with Soft-Start
V
IN
: 2.4V to 16V, V
OUT(MAX)
= 40V, I
Q
= 1.2mA, I
SD
< 1μA,
ThinSOT Package
LT3463/LT3463A Dual Output, Boost/Inverter, 250mA (ISW), Constant Off-Time, High
Effi ciency Step-Up DC/DC Converters with Integrated Schottkys
V
IN
: 2.3V to 15V, V
OUT(MAX)
= ±40V, I
Q
= 40μA, I
SD
< 1μA,
DFN Package
LT3471 Dual Output, Boost/Inverter, 1.3A (I
SW
), High Effi ciency
Boost-Inverting DC/DC Converter
V
IN
: 2.4V to 16V, V
OUT(MAX)
= ±40V, I
Q
= 2.5mA, I
SD
< 1μA,
DFN Package
Figure 6. One Li-Ion Cell Input Boost Converter with the LT3494A
SW CAP
D1
V
CC
SHDN
CTRL
7
6
2
3
5
4
V
OUT
FB
GND
R1
3494 F06
LT3494A
C2
4.7μF
C1, C2: X5R OR X7R WITH SUFFICIENT VOLTAGE RATING
C3: TAIYO YUDEN TMK316BJ106ML
D1: CENTRAL SEMICONDUCTOR CMDSH-3
L1: MURATA LQH32CN100K53
L1
10μH
C1
0.47μF
C3
10μF
81
V
IN
3V TO 4.2V
V
OUT
LOAD CURRENT (mA)
0.1
60
EFFICIENCY (%)
POWER LOSS (mW)
70
80
1 10 100
3494 F06b
50
55
65
75
45
40
100
200
300
50
150
250
0
V
IN
= 3.6V
V
OUT
= 16V
LOAD FROM CAPACITOR
LOAD FROM V
OUT
LOAD CURRENT (mA)
0.1
0
V
OUT
PEAK-TO-PEAK RIPPLE (mV)
10
15
1 10 100
3494 F06c
5
100MHz MEASUREMENT BW
Effi ciency and Power Loss vs Load Current
Output Voltage Ripple vs Load Current
V
OUT
R1 VALUE REQUIRED
(MΩ)
MAXIMUM OUTPUT CURRENT AT
3V INPUT (mA)
25 3.57 13.0
24 3.40 14.0
23 3.24 15.0
22 3.09 16.5
21 2.94 17.5
20 2.80 19.0
19 2.67 20.0
18 2.49 21.5
17 2.37 23.0
16 2.21 25.0
15 2.05 27.0