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
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 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 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
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
accommodated with a single external
resistor.
80% Typical Efficiency
80碌A(chǔ) Typical Quiescent Supply
Current
Externally Programmable Peak
Inductor Current Limit For
Maximum Efficiency
Logic Controlled Shutdown
< 1.0 碌A(chǔ) 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鈥檚
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT
V
BAT
= (1.6V to 6.0V)
L
1
47碌H
UPS530
SW
IN
SHDN
OUT
C
2
*
1nF
R
1
1M鈩?/div>
(For Contrast Adjustment)
V
OUT
= 18V 鹵 15%
LX1742
ADJ
FB
CS
GND
C
1
4.7碌F
R
CS
1k鈩?/div>
R
2
72k鈩?/div>
R
PWM
625k鈩?/div>
100kHz
V
PWM
= 3.0V
PACKAGE ORDER INFO
Plastic MSOP
T
A
(擄C)
DU
8-Pin
0 to 70
LX1742CDU
LX1742
LX1742
Note: Available in Tape & Reel.
Append the letter 鈥淭鈥?to the part number. (i.e. LX1742CDUT)
Copyright
錚?/div>
2000
Rev. 1.0, 2002-08-23
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
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