LT1945 LINER [Linear Technology], LT1945 Datasheet - Page 8

• Manufacturer Part Number: LT1945
• Description: Dual Micropower DC/DC Converter with Positive and Negative Outputs
• Manufacturer: LINER [Linear Technology]

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