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參數資料
| 型號： | CD43-4R7 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual Micropower DC/DC Converter with Positive and Negative Outputs |
| 中文描述： | 雙微功率DC / DC變換器的正，負輸出 |
| 文件頁數： | 1/8頁 |
| 文件大小： | 142K |
| 代理商： | CD43-4R7 |
1
LT1945
1945f
FEATURES
DESCRIPTIOU
The LT
1945 is a dual micropower DC/DC converter in a
10-pin MSOP package. Each converter is designed with a
350mA current limit and an input voltage range of 1.2V to
15V, making the LT1945 ideal for a wide variety of appli-
cations. Both converters feature a quiescent current of
only 20
μ
A at no load, which further reduces to 0.5
μ
A in
shutdown. A current limited, fixed off-time control scheme
conserves operating current, resulting in high efficiency
over a broad range of load current. The 36V switch allows
high voltage outputs up to
±
34V to be easily generated
without the use of costly transformers. The LT1945’s low
off-time of 400ns permits the use of tiny, low profile
inductors and capacitors to minimize footprint and cost in
space-conscious portable applications.
APPLICATIU
TYPICAL APPLICATIOU
Dual Micropower DC/DC
Converter with Positive and
Negative Outputs
I
Generates Well-Regulated Positive and
Negative Outputs
I
Low Quiescent Current:
20
μ
A in Active Mode (per Converter)
<1
μ
A in Shutdown Mode
I
Operates with V
IN
as Low as 1.2V
I
Low V
CESAT
Switch: 250mV at 300mA
I
Uses Small Surface Mount Components
I
High Output Voltage: Up to
±
34V
I
Tiny 10-Pin MSOP Package
I
Small TFT LCD Panels
I
Handheld Computers
I
Battery Backup
I
Digital Cameras
, LTC and LT are registered trademarks of Linear Technology Corporation.
LOAD CURRENT (mA)
0.1
E
1
10
100
1945 TA01a
90
85
80
75
70
65
60
55
50
+12V OUTPUT
–20V OUTPUT
Dual Output (+12V, –20V) Converter
C4
0.1
μ
F
Efficiency at V
IN
= 3.6V
V
IN
SW1
FB2
SW2
LT1945
4
3
L1
10
μ
H
D1
D2
SHDN2
GND
24.9k
365k
C2
1
μ
F
–20V
10mA
V
IN
2.7V
TO 5V
1945 TA01
7
PGND
9
PGND
6
8
10
4.7pF
C1
4.7
μ
F
NFB1
2
5
1
SHDN1
L2
10
μ
H
D3
1M
115k
C3
1
μ
F
100pF
C1: TAIYO YUDEN JMK212BJ475
C2, C3: TAIYO YUDEN TMK316BJ105
C4: TAIYO YUDEN EMK107BJ104
D1, D2, D3: ZETEX ZHCS400
L1, L2: MURATA LQH3C100
12V
20mA
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