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LX1742CDU-TR

Description
Switching Regulator, Voltage-mode, PDSO8, PLASTIC, MSOP-8
CategoryPower/power management    The power supply circuit   
File Size456KB,13 Pages
ManufacturerMicrosemi
Websitehttps://www.microsemi.com
Environmental Compliance  
Download Datasheet Parametric View All

LX1742CDU-TR Overview

Switching Regulator, Voltage-mode, PDSO8, PLASTIC, MSOP-8

LX1742CDU-TR Parametric

Parameter NameAttribute value
Is it lead-free?Lead free
Is it Rohs certified?conform to
MakerMicrosemi
Parts packaging codeMSOP
package instructionTSSOP,
Contacts8
Reach Compliance Codecompliant
ECCN codeEAR99
Analog Integrated Circuits - Other TypesSWITCHING REGULATOR
control modeVOLTAGE-MODE
Control TechnologyPULSE FREQUENCY MODULATION
Maximum input voltage6 V
Minimum input voltage1.6 V
Nominal input voltage3 V
JESD-30 codeR-PDSO-G8
JESD-609 codee3
length2.95 mm
Humidity sensitivity level1
Number of functions1
Number of terminals8
Maximum operating temperature70 °C
Minimum operating temperature
Package body materialPLASTIC/EPOXY
encapsulated codeTSSOP
Package shapeRECTANGULAR
Package formSMALL OUTLINE, THIN PROFILE, SHRINK PITCH
Peak Reflow Temperature (Celsius)260
Certification statusNot Qualified
Maximum seat height1.1 mm
surface mountYES
Switch configurationBOOST
Temperature levelCOMMERCIAL
Terminal surfaceMATTE TIN
Terminal formGULL WING
Terminal pitch0.65 mm
Terminal locationDUAL
Maximum time at peak reflow temperature40
width3 mm
LX1742
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 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 80µA (typ) and
a shutdown current of less than 1µA.
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.
80% Typical Efficiency
80µA Typical Quiescent Supply
Current
Externally Programmable Peak
Inductor Current Limit For
Maximum Efficiency
Logic Controlled Shutdown
< 1.0 µA 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
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT
V
BAT
= (1.6V to 6.0V)
L
1
47µH
UPS530
SW
IN
SHDN
OUT
C
2
*
1nF
R
1
1MΩ
(For Contrast Adjustment)
V
OUT
= 18V ± 15%
LX1742
ADJ
FB
CS
GND
C
1
4.7µF
R
CS
1kΩ
R
2
72kΩ
R
PWM
625kΩ
100kHz
V
PWM
= 3.0V
PACKAGE ORDER INFO
Plastic MSOP
DU
8-Pin
T
A
(°C)
0 to 70
LX1742CDU
LX1742
LX1742
RoHS Compliant / Pb-free
Transition DC: 0432
Note: Available in Tape & Reel. Append the letters “TR” to the
part number. (i.e. LX1742CDU-TR)
Copyright
©
2000
Rev. 1.0b, 2005-03-03
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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