LT1945
TYPICAL APPLICATIO
L1
10µH
8
V
IN
2
C1
4.7µF
4
SHDN2
3
7
9
SHDN1
LT1945
FB2
6
80.6k
C3
1µF
32V
5mA
(408)573-4150
(408)573-4150
(408)573-4150
(631)543-7100
(814)237-1431
1945 TA02
Dual Output (±32V) Converter
V
IN
2.7V
TO 5V
C4
0.1µF
D1
–32V
5mA
10
SW1
NFB1
1
100pF
604k
D2
5
24.9k
GND PGND PGND SW2
EFFICIENCY (%)
4.7pF
L2
10µH
C1: TAIYO YUDEN JMK212BJ475
C2, C3: TAIYO YUDEN GMK316BJ105
C4: TAIYO YUDEN UMK212BJ104
D1, D2, D3: ZETEX ZHCS400
L1, L2: MURATA LQH3C100
D3
RELATED PARTS
PART NUMBER
LT1613
LT1615/LT1615-1
LT1940
LT1944
LT1944-1
LT1949/LT1949-1
DESCRIPTION
COMMENTS
550mA I
SW
, 1.4MHz, High Efficiency Step-Up DC/DC Converter V
IN
= 0.9V to 10V, V
OUT
= 34V, I
Q
= 3mA, I
SD
= <1µA,
ThinSOT Package
300mA I
SW
, Constant Off-Time, High Efficiency
Step-Up DC/DC Converter
Dual Output 1.4A (I
OUT
), Constant 1.1MHz, High Efficiency
Step-Down DC/DC Converter
Dual Output 350mA I
SW
, Constant Off-Time, High Efficiency
Step-Up DC/DC Converter
Dual Output 150mA I
SW
, Constant Off-Time, High Efficiency
Step-Up DC/DC Converter
550mA I
SW
, 600kHz/1.1MHz, High Efficiency
Step-Up DC/DC Converter
V
IN
= 1.2V to 15V, V
OUT
= 34V, I
Q
= 20µA, I
SD
= <1µA,
ThinSOT Package
V
IN
= 3V to 25V, V
OUT
= 1.2V, I
Q
= 2.5mA, I
SD
= <1µA,
TSSOP-16E Package
V
IN
= 1.2V to 15V, V
OUT
= 34V, I
Q
= 20µA, I
SD
= <1µA, MS Package
V
IN
= 1.2V to 15V, V
OUT
= 34V, I
Q
= 20µA, I
SD
= <1µA, MS Package
V
IN
= 1.5V to 12V, V
OUT
= 28V, I
Q
= 4.5mA, I
SD
= <25µA,
S8, MS8 Packages
V
IN
= 0.85V to 5V, V
OUT
= 5V, I
Q
= 19µA/300µA, I
SD
= <1µA,
ThinSOT Package
V
IN
= 0.5V to 5V, V
OUT
= 6V, I
Q
= 38µA, I
SD
= <1µA, MS Package
V
IN
= 0.5V to 5V, V
OUT
= 6V, I
Q
= 38µA, I
SD
= <1µA, MS Package
V
IN
= 0.5V to 5V, V
OUT
= 6V, I
Q
= 38µA, I
SD
= <1µA, MS Package
V
IN
= 0.5V to 5V, V
OUT
= 6V, I
Q
= 38µA, I
SD
= <1µA, MS Package
1945f
LTC3400/LTC3400B 600mA I
SW
, 1.2MHz, Synchronous Step-Up DC/DC Converter
LTC3401
LTC3402
LTC3423
LTC3424
1A I
SW
, 3MHz, Synchronous Step-Up DC/DC Converter
2A I
SW
, 3MHz, Synchronous Step-Up DC/DC Converter
1A I
SW
, 3MHz, Low V
OUT
, Synchronous Step-Up
DC/DC Converter
2A I
SW
, 3MHz, Low V
OUT
, Synchronous Step-Up
DC/DC Converter
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
q
FAX: (408) 434-0507
q
U
Efficiency at V
IN
= 3.6V
80
75
C2
1µF
+32V OUTPUT
70
65
60
55
50
0.1
–32V OUTPUT
2M
1
LOAD CURRENT (mA)
10
1945 TA02a
LT/TP 0802 2K • PRINTED IN USA
www.linear.com
©
LINEAR TECHNOLOGY CORPORATION 2001
LINER [ LINEAR TECHNOLOGY ]
