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PDF LX1742 Data sheet ( Hoja de datos )
| Número de pieza | LX1742 | |
| Descripción | High Efficiency High Voltage Boost Controller | |
| Fabricantes | Microsemi Corporation | |
| Logotipo |  |
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INTEGRATED PRODUCTS
LX1742
High Efficiency High Voltage Boost Controller
PRODUCTION DATA SHEET
DESCRIPTION
The LX1742 is a compact high The input voltage ranges from 1.6V to
efficiency step-up boost controller. 6.0V, allowing for a wide selection of
Featuring a pseudo-hysteretic pulse system battery voltages. Start-up
frequency modulation topology, the operation is guaranteed at 1.6V input
LX1742 was designed for maximum The LX1742 is capable of achieving
efficiency, reduced board size, and output voltages as high as 25V and the
minimal cost.
output voltage is easily programmed
Utilizing an internal N-Channel using two external resistors in
MOSFET, the LX1742 offers conjunction with the feedback pin.
designers maximum flexibility with The LX1742 has an additional feature
respect to efficiency and cost. The for simple dynamic adjustment of the
LX1742 provides several design output voltage (i.e., up to ±15% of the
enhancements that improve overall nominal output voltage). Voltage
performance under very light load adjustment is achieved via an analog
currents by implementing control reference signal or a direct PWM input
circuitry that is optimized for portable signal applied to the ADJ pin. Any
systems - thus providing a quiescent PWM amplitude is easily
supply current of only 80µA (typ) and accommodated with a single external
a shutdown current of less than 1µA. resistor.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
L1
47µH
UPS530
SW
IN OUT
SHDN
LX1742
C2 *
1nF
ADJ FB
CS
GND
RCS
1kΩ
VBAT = (1.6V to 6.0V)
VOUT = 18V ± 15%
(For Contrast Adjustment)
1MR1Ω
C1
4.7µF
R2
72kΩ
KEY FEATURES
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
RPWM
625kΩ
100kHz
VPWM = 3.0V
Copyright © 2000
Rev. 1.0b, 2005-03-03
PACKAGE ORDER INFO
TA (°C)
Plastic MSOP
DU 8-Pin
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)
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
1 page  
INTEGRATED PRODUCTS
LX1742
High Efficiency High Voltage Boost Controller
PRODUCTION DATA SHEET
APPLICATION CIRCUITS (CONTINUED)
Typical LCD Bias Applications (Cont)
VBAT = (1.6V to 6.0V)
L1
47µH
VADJ = 0.9V to 1.5V
IN
SHDN
SW
OUT
LLXX1774422
FB
ADJ CS
+ GND
-
R1
RCS
4kΩ
R2
C2*
1nF
VOUT
=
VADJ ⎜⎜⎝⎛1+
R1
R2
⎟⎟⎠⎞
C1
10µF
* Optional Component
used to reduce output
voltage ripple.
Figure 3 – Circuit Showing Dynamic Output Voltage Operation Via Analog Voltage Input and Using the Internal Diode
Switch (Optional).
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
Page 5
5 Page 
INTEGRATED PRODUCTS
LX1742
High Efficiency High Voltage Boost Controller
PRODUCTION DATA SHEET
EVALUATION BOARD (CONTINUED)
Figure 7 – LXE1742 - Bottom Trace Layer
X4 X3
VIN
Vin
/SHDN
ADJ
GND
R1
GND
L1
SWITCH
CR1
U1
JU1 JU4
R7
R2 FDBK
Q1
JU5
VOUT
GND2
Microsemi
LX1742
EVALUATION BOARD SGE#3503
X1 REV X2
X2
Figure 8 – LXE1742 - Board Layout
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
Page 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet LX1742.PDF ] | |
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