LX1734 Datasheet, PDF (1/8 Pages) Microsemi Corporation – 1.0MHz Inverting DC/DC Converter

LX1734
TM
®
1.0MHz Inverting DC/DC Converter
DESCRIPTION
The LX1734 is an inverting Fixed frequency operation ensures a
DC/DC current-mode controller. With clean output free from low frequency
a 750mA integrated switch, the noise typically present with charge pump
LX1734 can generate large output solutions. The low impedance output
currents in a small footprint. The remains within 1% of nominal during
LX1734 minimizes external com- large load steps. The 18V switch allows
ponent size and cost by implementing high voltage outputs to be generated.
a high switching frequency of The LX1734 is available in the space
1.0MHz, while generating -5V at saving 6-lead 3x3 Jedec MO-229
250mA.
package, which has the same footprint
When configured in the dual and lead spacing as the SOT-23A. A
inductor inverting topology very low complete inverter function utilizes less
output voltage ripple approaching than 0.3² inches of PCB space.
1mV_P-P can be achieved when used in
conjunction with ceramic output
capacitors. The dual inductor can be
implemented as a coupled or separate
cores.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
V_IN = 5V
C1
10µF
PRODUCT HIGHLIGHT
L1A
22µH
C2
1µF
L1B
22µH
V_IN
SW
LX1734
SD
NFB
GND
R1
29.4k
R2
10k
C4
1000pF
KEY FEATURES
ƒ Fixed Frequency 1.0MHz
Operation
ƒ Very Low Noise: 1mV_P-P Output
Ripple Possible With Cuk
Topology
ƒ Stable Operation With Ceramic or
Tantalum Capacitors
ƒ -5V at 250mA from 5V Input
ƒ Uses Small Surface Mount L/C
Components
ƒ Wide Input Range: 4.2V to 8V
ƒ Low VCESAT Switch: 600mV at
600mA
ƒ 6-Lead 3x3mm JEDEC MLPM
Package
ƒ Functionally Compatible with
LT1611 or LT1931
APPLICATIONS/BENEFITS
ƒ Disk Drive MR Head Bias
ƒ Digital Camera CCD Bias
ƒ LCD Bias
ƒ GaAs FET Bias
ƒ Local -5V or -12V Supplies
V_OUT = -5V
@ 150mA
C3
22µF
Note: L1A and L1B are shown as coupled. Individual inductors can also be used.
C1, C2, C3 are ceramic capacitors
Figure 1
Copyright © 2002
Rev. 3.0a, 2005-03-14
PACKAGE ORDER INFO
T_A (°C)
Plastic MLPL
LM _6-Pin
RoHS Compliant / Pb-free
Transition DC: 0452
0 to 85
LX1734CLM
Note: Available in Tape & Reel. Append the letters “TR” to the
part number. (i.e. LX1734CLM-TR)
Microsemi
Microsemi Integrated Products
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
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