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参数资料
| 型号： | LX1734-CSET |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 1400 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封装： | PLASTIC, SOT-23, 5 PIN |
| 文件页数： | 1/4页 |
| 文件大小： | 66K |
| 代理商： | LX1734-CSET |
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright
2000
Rev. 0.2, 2001-02-15
WWW.
Microsemi
.COM
LX1734
1.2MHz Inverting DC/DC Converter
PRELIMINARY
A
M I CROS E M I
COM P A N Y
The
LX1734
is
an
inverting
DC/DC current-mode controller. With
a 1A integrated switch, the LX1734
can generate large output currents in a
small
footprint.
The
LX1734
minimizes external component size
and cost by implementing a high
switching frequency of 1.2MHz, while
generating -5V at 250mA or -12V at
100mA.
The LX1734 operates in a dual
inductor inverting topology that filters
both the input side and output side
current.
Very low output voltage
ripple
approaching
1mVP-P
can
be
achieved when used in conjunction with
ceramic output capacitors.
Fixed frequency operation ensures a
clean output free from low frequency
noise typically present with charge pump
solutions. The low impedance output
remains within 1% of nominal during
large load steps. The 20V switch allows
high voltage outputs to be generated.
The LX1734 is available in the space
saving 5-lead SOT-23 package, enabling
a complete inverter function that utilizes
only 0.3 inches square of PCB space.
IMPORTANT: For the most current data, consult
MICROSEMI’s website: http://www.microsemi.com
Fixed Frequency 1.2MHz
Operation
Very Low Noise: 1mVP-P Output
Ripple
Stable Operation With Ceramic or
Tantalum Capacitors
-5V at 250mA from 5V Input
-12V at 100mA from 5V Input
Uses Small Surface Mount L/C
Components
Wide Input Range: 4V to 10V
Low VCESAT Switch: 600mV at
1A
5-Lead SOT-23 Package
Disk Drive MR Head Bias
Digital Camera CCD Bias
LCD Bias
GaAs FET Bias
Local -5V or -12V Supplies
C1
10
F
V
IN
= 5 V
LX 1734
V
IN
SW
L1A
22
H
GN D
NF B
C2
1
F
R2
10k
R1
29.4k
L1B
22
H
C3
22
F
V
OU T = -5 V
@ 150m A
C4
1000pF
N o te : L1 A a n d L 1 B are shown as co u p le d . If indiv idu al indu ctors a re used th e n : L1= L2=4 7
H
C 1 , C 2 , C 3 a re ce ra m ic ca p a c ito rs
TA (
°C)
SE
Plastic SOT-23
5-Pin
0 to 85
LX1734-CSE
Note: Available in Tape & Reel.
Append the letter “T” to the part number. (i.e. LX1734-CSET)
LL
XX
11
77
33
44
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| LX432ISCTR | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.24 V, PDSO3 |
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