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CDRH4D18-100 fiches techniques PDF

Linear Technology - Dual Micropower DC/DC Converter with Positive and Negative Outputs

Numéro de référence CDRH4D18-100
Description Dual Micropower DC/DC Converter with Positive and Negative Outputs
Fabricant Linear Technology 
Logo Linear Technology 





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CDRH4D18-100 fiche technique
FEATURES
s Generates Well-Regulated Positive and
Negative Outputs
s Low Quiescent Current:
20µA in Active Mode (per Converter)
<1µA 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
U
APPLICATIO S
s Small TFT LCD Panels
s Handheld Computers
s Battery Backup
s Digital Cameras
LT1945
Dual Micropower DC/DC
Converter with Positive and
Negative Outputs
DESCRIPTIO
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 20µA 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
VIN
2.7V
TO 5V
C1
4.7µF
Dual Output (+12V, –20V) Converter
L1
10µH
C4
0.1µF
D1
8 10
VIN
2
SHDN1
SW1
1
NFB1
LT1945
4
SHDN2
5
FB2
GND PGND PGND SW2
37 96
D2
100pF 365k
24.9k
–20V
10mA
C2
1µF
115k
L2
10µH
C1: TAIYO YUDEN JMK212BJ475
C2, C3: TAIYO YUDEN TMK316BJ105
C4: TAIYO YUDEN EMK107BJ104
D1, D2, D3: ZETEX ZHCS400
L1, L2: MURATA LQH3C100
4.7pF
D3
C3
1M 1µF
12V
20mA
1945 TA01
Efficiency at VIN = 3.6V
90
85
+12V OUTPUT
80
–20V OUTPUT
75
70
65
60
55
50
0.1
1 10
LOAD CURRENT (mA)
100
1945 TA01a
1945f
1

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