參數(shù)資料
型號： LX1742CDU-TR
廠商： MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, PDSO8
封裝： PLASTIC, MSOP-8
文件頁數(shù)： 1/13頁
文件大?。?/td> 456K
代理商： LX1742CDU-TR
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
Copyright
2000
Rev. 1.0b, 2005-03-03
WWW
.Microse
m
i
.CO
M
LX1742
High Efficiency High Voltage Boost Controller
PRODUCTION DATA SHEET
I N T E GRA T ED
PR ODUC T S
DESCRI PTI O N
The LX1742 is a compact high
efficiency step-up boost controller.
Featuring a pseudo-hysteretic pulse
frequency modulation topology, the
LX1742 was designed for maximum
efficiency, reduced board size, and
minimal cost.
Utilizing an internal N-Channel
MOSFET,
the
LX1742
offers
designers maximum flexibility with
respect to efficiency and cost. The
LX1742
provides
several
design
enhancements that improve overall
performance under very light load
currents by implementing control
circuitry that is optimized for portable
systems - thus providing a quiescent
supply current of only 80A (typ) and
a shutdown current of less than 1A.
The input voltage ranges from 1.6V to
6.0V, allowing for a wide selection of
system
battery
voltages.
Start-up
operation is guaranteed at 1.6V input
The LX1742 is capable of achieving
output voltages as high as 25V and the
output voltage is easily programmed
using
two
external
resistors
in
conjunction with the feedback pin.
The LX1742 has an additional feature
for simple dynamic adjustment of the
output voltage (i.e., up to ±15% of the
nominal output voltage).
Voltage
adjustment is achieved via an analog
reference signal or a direct PWM input
signal applied to the ADJ pin. Any
PWM
amplitude
is
easily
accommodated with a single external
resistor.
IMPORTANT:
For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATUR ES
80% Typical Efficiency
80A Typical Quiescent Supply
Current
Externally Programmable Peak
Inductor Current Limit For
Maximum Efficiency
Logic Controlled Shutdown
< 1.0 A Shutdown Current (typ)
Dynamic Output Voltage
Adjustment Via Analog
Reference Or Direct PWM Input
8-Pin MSOP Package
APPLICATIONS/BENEFITS
Pagers
Wireless Phones
PDAs
Handheld Computers
General LCD Bias Applications
LED Driver
PRODUCT H I GHLIGHT
V
BAT = (1.6V to 6.0V)
C
1
4.7F
R
1
1M
R
2
72k
R
CS
1k
L
1
47H
100kHz
V
PWM = 3.0V
V
OUT = 18V ± 15%
(For Contrast Adjustment)
LX1742
C
2 *
1nF
R
PWM
625k
UPS530
SW
SHDN
IN
OUT
GND
FB
CS
ADJ
PACKAGE ORDER INFO
DU
Plastic MSOP
8-Pin
TA (
°C)
RoHS Compliant / Pb-free
Transition DC: 0432
0 to 70
LX1742CDU
Note: Available in Tape & Reel. Append the letters “TR” to the
part number. (i.e. LX1742CDU-TR)
LL
XX
11
77
44
22
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LX1744CPW 功能描述:IC LED DRVR WT/CLR BCKLT 14TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅動器 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 恒定電流:- 恒定電壓:- 拓撲:升壓（升壓），切換式電容器（充電泵） 輸出數(shù):1 內部驅動器:是 類型 - 主要:背光 類型 - 次要:白色 LED 頻率:625kHz ~ 875kHz 電源電壓:2.7 V ~ 5.3 V 輸出電壓:5V 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:10-µMAX 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C
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