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LX1741CLM Datasheet

  • LX1741CLM

  • DC:DC Converter

  • 15頁(yè)

  • ETC

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LX1741
I N T E G R A T E D
P R O D U C T S
High Efficiency High Voltage Boost Controller
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
WWW .
Microsemi
.C
OM
The LX1741 is a compact high
efficiency step-up boost controller.
Featuring a pseudo-hysteretic pulse
frequency modulation topology, the
LX1741 was designed for maximum
efficiency, reduced board size, and
minimal cost.
Utilizing an external N-Channel
MOSFET, the LX1741 offers
designers maximum flexibility with
respect to efficiency and cost. The
LX1741 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 80碌A(chǔ) (typ) and
a shutdown current of less than 1碌A(chǔ).
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 output voltage is programmed
easily using two external resistors in
conjunction with the feedback pin.
Depending on the MOSFET selected,
the LX1741 is capable of achieving
output voltages much higher than 40V.
The LX1741 has an additional feature
for simple dynamic adjustment of the
output voltage (i.e., up to
鹵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 accom-
modated with a single external resistor.
The LX1741 is available in both the 8-
Pin MSOP, and the miniature 8-Pin MLP
requiring minimal PCB area.
> 85% Maximum Efficiency
80碌A(chǔ) Typical Quiescent Supply
Current
Externally Programmable Peak
Inductor Current Limit For
Maximum Efficiency
Logic Controlled Shutdown
< 0.5 碌A(chǔ) Shutdown Current (typ)
Dynamic Output Voltage
Adjustment Via Analog Reference
Or Direct PWM Input
8-Pin MSOP Package or 8-Pin
MLP
APPLICATIONS/BENEFITS
Pagers
Wireless Phones
PDAs
Handheld Computers
General LCD Bias Applications
LED Driver
IMPORTANT:
For the most current data, consult
MICROSEMI鈥檚
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT
L
1
V
LCD
= 18V 鹵 15%
C
1
4.7碌F
V
BAT
= 1.6V to 6.0V
47碌H
1206 Case Size
NDRV
IN
SRC
SHDN
ON OFF
LX1741
FB
ADJ
GND
CS
R
CS
1k鈩?/div>
LX1741
LX1741
T
A
(擄C)
0 to 70
PACKAGE ORDER INFO
Plastic MLP
Plastic MSOP
LM
8-Pin
DU
8-Pin
LX1741CLM
LX1741CDU
Note: Available in Tape & Reel.
Append the letter 鈥淭鈥?to the part number. (i.e. LX1741CDUT)
Copyright
錚?/div>
2000
Rev. 1.1, 2002-11-21
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1

LX1741CLM 產(chǎn)品屬性

  • 3,000

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電壓模式

  • 1

  • -

  • 90%

  • 1.6 V ~ 6 V

  • 無(wú)

  • 是

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 0°C ~ 70°C

  • 8-MLP

  • 管件

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