參數(shù)資料
型號： LX1732CDU-TR
廠商： MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP
元件分類： 穩(wěn)壓器
英文描述： 1 A SWITCHING REGULATOR, 135 kHz SWITCHING FREQ-MAX, PDSO8
封裝： LEAD FREE, PLASTIC, MSOP-8
文件頁數(shù)： 1/12頁
文件大小： 322K
代理商： LX1732CDU-TR
Microsemi
Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright
2000
Rev. 1.1c, 2005-03-03
WWW
.Microse
m
i
.CO
M
LX1732
High Current PFM Boost Converter
PRODUCTION DATA SHEET
I N T E GRA T ED
PR ODUC T S
DESCRI PTI O N
The LX1732 is a compact, high
efficiency, step-up DC-DC boost
regulator
implemented
in
a
BiCMOS process technology. This
device features variable frequency
operation and a built in N-channel
MOSFET
power
switch
for
optimal functioning in low voltage
portable systems.
Start-up operation is guaranteed
from 1.1V inputs (at light load)
and the input voltage can be as low
as 0.7V after start-up.
This
attribute allows the LX1732 to
operate in an extended power-
savings mode, supplying (data)
critical system components, even
after battery capacity no longer
supports normal operation.
The output voltage programming
range of 2.2V to 5V, requires only
two external resistors via the
feedback pin (see Figure 1.0).
Output load currents of up to
200mA are achievable and the
internal MOSFET is capable of
switching up to a 1A current limit.
Quiescent current during operation
is 200A (max) and in shutdown-
mode drops to a mere 1A thus
maximizing overall battery life-
time.
The LX1732 features a low
battery-detect circuitry that alerts
system power management of low
input
voltages
thus
allowing
portable systems to enter a power-
savings mode (e.g., to protect data)
IMPORTANT:
For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATUR ES
88% Efficiency
200A Quiescent Current
0.1A Logic Shutdown
Low-Battery Detector
8-Pin MSOP Package
APPLICATIONS/BENEFITS
Pagers
Wireless Phones
Hand-Held Computers
PDAs
RF Tags
Two-cell Alkaline Battery
Applications
Single-cell Lithium Ion 5V
Boost
PRODUCT H I GHLIGHT
V
BAT
V
OUT
LX1732
GND
VC
FB
SW
SHDN
IN
LBI
LBO
L
D
C
OUT
R
1
R
2
R
3
R
4
C
IN
50%
60%
70%
80%
90%
100%
0
25
50
75
100
125
150
175
200
Output Current
E
ffi
cien
cy
(%
)
Figure 1 – LX1732 General Circuit Topology and Typical Efficiency Performance
PACKAGE ORDER INFO
DU
Plastic MSOP
8-Pin
TA (
°C)
RoHS Compliant / Pb-free
Transition DC: 0432
0 to 70
LX1732CDU
Note: Available in Tape & Reel. Append the letters “TR” to the part
number. (i.e. LX1732CDU-TR)
LL
XX
11
77
33
22
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