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Microsemi Corporation - High Efficiency High Voltage Boost Controller

Numéro de référence LX1741
Description High Efficiency High Voltage Boost Controller
Fabricant Microsemi Corporation 
Logo Microsemi Corporation 





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LX1741 fiche technique
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INTEGRATED PRODUCTS
LX1741
High Efficiency High Voltage Boost Controller
PRODUCTION DATA SHEET
DESCRIPTION
The LX1741 is a compact high operation is guaranteed at 1.6V input
efficiency step-up boost controller. The output voltage is programmed
Featuring a pseudo-hysteretic pulse easily using two external resistors in
frequency modulation topology, the conjunction with the feedback pin.
LX1741 was designed for maximum Depending on the MOSFET selected,
efficiency, reduced board size, and the LX1741 is capable of achieving
minimal cost.
output voltages much higher than 40V.
Utilizing an external N-Channel The LX1741 has an additional feature
MOSFET, the LX1741 offers for simple dynamic adjustment of the
designers maximum flexibility with output voltage (i.e., up to ±15% of the
respect to efficiency and cost. The nominal output voltage). Voltage
LX1741 provides several design adjustment is achieved via an analog
enhancements that improve overall reference signal or a direct PWM input
performance under very light load signal applied to the ADJ pin. Any
currents by implementing control PWM amplitude is easily accom-
circuitry that is optimized for portable modated with a single external resistor.
systems - thus providing a quiescent The LX1741 is available in both the 8-
supply current of only 80µA (typ) and Pin MSOP, and the miniature 8-Pin MLP
a shutdown current of less than 1µA. requiring minimal PCB area.
The input voltage ranges from 1.6V
to 6.0V, allowing for a wide selection
of system battery voltages. Start-up
KEY FEATURES
> 85% Maximum Efficiency
80µA Typical Quiescent Supply
Current
Externally Programmable Peak
Inductor Current Limit For
Maximum Efficiency
Logic Controlled Shutdown
< 0.5 µA 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’s website: http://www.microsemi.com
VBAT = 1.6V to 6.0V
ON OFF
PRODUCT HIGHLIGHT
L1
47µH
1206 Case Size
IN
SHDN
NDRV
SRC
LX1741
FB
ADJ CS
GND
RCS
1k
VLCD = 18V ± 15%
C1
4.7µF
TA (°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 “T” to the part number. (i.e. LX1741CDUT)
Copyright 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
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