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CD43-4R7 Scheda tecnica(PDF) 1 Page - Linear Technology

Il numero della parte CD43-4R7
Spiegazioni elettronici  Dual Micropower DC/DC Converter with Positive and Negative Outputs
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Produttore elettronici  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

CD43-4R7 Scheda tecnica(HTML) 1 Page - Linear Technology

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1
LT1945
1945f
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO
Dual Micropower DC/DC
Converter with Positive and
Negative Outputs
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
µA at no load, which further reduces to 0.5µA 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.
s
Generates Well-Regulated Positive and
Negative Outputs
s
Low Quiescent Current:
20
µA in Active Mode (per Converter)
<1
µA in Shutdown Mode
s
Operates with VIN as Low as 1.2V
s
Low VCESAT Switch: 250mV at 300mA
s
Uses Small Surface Mount Components
s
High Output Voltage: Up to
±34V
s
Tiny 10-Pin MSOP Package
s
Small TFT LCD Panels
s
Handheld Computers
s
Battery Backup
s
Digital Cameras
, LTC and LT are registered trademarks of Linear Technology Corporation.
LOAD CURRENT (mA)
0.1
1
10
100
1945 TA01a
90
85
80
75
70
65
60
55
50
+12V OUTPUT
–20V OUTPUT
Dual Output (+12V, –20V) Converter
Efficiency at VIN = 3.6V
VIN
SW1
FB2
LT1945
4
3
L1
10
µH
D1
D2
SHDN2
24.9k
365k
C2
1
µF
–20V
10mA
VIN
2.7V
TO 5V
1945 TA01
GND
7
PGND
9
PGND
6
810
SW2
4.7pF
C1
4.7
µF
C4
0.1
µF
NFB1
2
5
1
SHDN1
L2
10
µH
D3
1M
115k
C3
1
µF
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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