Datasheet

LT1945
8
1945fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
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FAX: [phone]
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www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2001
LT 1208 REV A • PRINTED IN USA
RELATED PARTS
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
= 34V, I
Q
= 3mA, I
SD
= <1μA,
ThinSOT Package
LT1615/LT1615-1 300mA I
SW
, Constant Off-Time, High Effi ciency
Step-Up DC/DC Converter
V
IN
= 1.2V to 15V, V
OUT
= 34V, I
Q
= 20μA, I
SD
= <1μA,
ThinSOT Package
LT1940 Dual Output 1.4A (I
OUT
), Constant 1.1MHz, High Effi ciency
Step-Down DC/DC Converter
V
IN
= 3V to 25V, V
OUT
= 1.2V, I
Q
= 2.5mA, I
SD
= <1μA,
TSSOP-16E Package
LT1944 Dual Output 350mA I
SW
, Constant Off-Time, High Effi ciency
Step-Up DC/DC Converter
V
IN
= 1.2V to 15V, V
OUT
= 34V, I
Q
= 20μA, I
SD
= <1μA, MS Package
LT1944-1 Dual Output 150mA I
SW
, Constant Off-Time, High Effi ciency
Step-Up DC/DC Converter
V
IN
= 1.2V to 15V, V
OUT
= 34V, I
Q
= 20μA, I
SD
= <1μA, MS Package
LT1949/LT1949-1 550mA I
SW
, 600kHz/1.1MHz, High Effi ciency
Step-Up DC/DC Converter
V
IN
= 1.5V to 12V, V
OUT
= 28V, I
Q
= 4.5mA, I
SD
= <25μA,
S8, MS8 Packages
LTC3400/LTC3400B 600mA I
SW
, 1.2MHz, Synchronous Step-Up DC/DC Converter V
IN
= 0.85V to 5V, V
OUT
= 5V, I
Q
= 19μA/300μA, I
SD
= <1μA,
ThinSOT Package
LTC3401 1A I
SW
, 3MHz, Synchronous Step-Up DC/DC Converter V
IN
= 0.5V to 5V, V
OUT
= 6V, I
Q
= 38μA, I
SD
= <1μA, MS Package
LTC3402 2A I
SW
, 3MHz, Synchronous Step-Up DC/DC Converter V
IN
= 0.5V to 5V, V
OUT
= 6V, I
Q
= 38μA, I
SD
= <1μA, MS Package
LTC3423 1A I
SW
, 3MHz, Low V
OUT
, Synchronous Step-Up
DC/DC Converter
V
IN
= 0.5V to 5V, V
OUT
= 6V, I
Q
= 38μA, I
SD
= <1μA, MS Package
LTC3424 2A I
SW
, 3MHz, Low V
OUT
, Synchronous Step-Up
DC/DC Converter
V
IN
= 0.5V to 5V, V
OUT
= 6V, I
Q
= 38μA, I
SD
= <1μA, MS Package
TYPICAL APPLICATIONS
V
IN
SW1
FB2
LT1945
4
3
L1
10μH
D1
D2
SHDN2
24.9k
604k
C2
1μF
–32V
5mA
V
IN
2.7V
TO 5V
1945 TA02
GND
7
PGND
9
PGND
6
810
SW2
4.7pF
C1
4.7μF
NFB1
2
5
1
SHDN1
L2
10μH
D3
100pF
C1: TAIYO YUDEN JMK212BJ475
C2, C3: TAIYO YUDEN GMK316BJ105
C4: TAIYO YUDEN UMK212BJ104
D1, D2, D3: ZETEX ZHCS400
L1, L2: MURATA LQH3C100
32V
5mA
C4
0.1μF
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2M
80.6k
C3
1μF
Dual Output (±32V) Converter
LOAD CURRENT (mA)
0.1
50
EFFICIENCY (%)
55
60
65
70
80
110
1945 TA02a
75
+32V OUTPUT
–32V OUTPUT
Effi ciency at VIN = 3.6V