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LX1993 Datasheet

  • LX1993

  • Microsemi Corporation [High Efficiency LED Driver]

  • MICROSEMI

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LX1993
I N T E G R A T E D
P R O D U C T S
High Efficiency LED Driver
P
RODUCTION
DESCRIPTION
KEY FEATURES
WWW .
Microsemi
.C
OM
The LX1993 is a high efficiency
step-up boost converter that features a
psuedo-hysteretic pulse frequency
modulation topology for driving
white or color LEDs in backlight or
frontlight systems.
Designed for
maximum efficiency, reduced board
size, and minimal cost, the LX1993 is
ideal for PDA and digital camera
applications. The LX1993 features an
internal N-Channel MOSFET and
control circuitry that is optimized for
portable system design applications.
The LX1993 promotes improved
performance in battery-operated
systems by operating with a quiescent
supply current 70碌A(chǔ) (typical) and a
shutdown current of less than 1碌A(chǔ).
The input voltage range is from 1.6V
to 6.0V thus allowing for a broad
selection
of
battery
voltage
applications
and
start-up
is
guaranteed at 1.6V input.
The LX1993 is capable of switching
currents in excess of 300mA and the
output current is readily programmed
using one external current sense
resistor in series with the LEDs. This
configuration provides a feedback
signal to the FB pin thus maintaining
constant output current regardless of
varying LED forward voltage (V
F
).
The LX1993 provides an additional
feature for simple dynamic adjustment
of the output current (i.e., up to 100%
of the maximum programmed current).
Designers can make this adjustment by
generating an analog reference signal
or a PWM signal applied directly to
the ADJ pin and any PWM amplitude
is readily accommodated via a single
external resistor. The LX1993 is
available in the 8-Pin MSOP and thus
requires a very small PCB area.
> 80% Maximum Efficiency
70碌A(chǔ) Typical Quiescent Supply
Current
Externally Programmable Peak
Inductor Current Limit For
Maximum Efficiency
Logic Controlled Shutdown
< 1碌A(chǔ) Shutdown Current
Dynamic Output Current
Adjustment Via Analog
Reference Or Direct PWM Input
8-Pin MSOP Package
APPLICATIONS
Pagers
Wireless Phones
PDAs
Handheld Computers
LED Driver
Digital Camera Displays
IMPORTANT:
For the most current data, consult
MICROSEMI鈥檚
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT
SW
IN
OUT
SHDN
Li-Ion
ON OFF
LX1993
FB
ADJ
GND
CS
LX1993
LX1993
PACKAGE ORDER INFO
Plastic MSOP
DU
8-Pin
T
A
(擄C)
0 to 70
LX1993CDU
RoHS Compliant / Pb-free
Transition DC: 0432
Note: Available in Tape & Reel. Append the letters 鈥淭R鈥?to the part
number. (i.e. LX1993CDU-TR)
Copyright
漏
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 1

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