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LX1745-CPW Datasheet

  • LX1745-CPW

  • Triple Output Boost ? LED Driver / LCD Bias

  • 16頁(yè)

  • MICROSEMI

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LX1745
I N T E G R A T E D
P R O D U C T S
Triple Output Boost 鈥?LED Driver / LCD Bias
P
RODUCTION
D
ATASHEET
DESCRIPTION
The LX1745 is a compact high
efficiency step-up boost regulator for
driving white or color LEDs in LCD
lighting applications while supplying the
necessary LCD bias voltages with an
additional two integrated boost converters.
Designed for maximum efficiency and
featuring a psuedo-hysteretic PFM
topology (that decreases output voltage
ripple), the LX1745 minimizes system cost
and condenses layout area making it ideal
for PDA, smart-phone, and digital camera
applications.
While the LCD Bias generation is
implemented using an internal N-Channel
MOSFET for LCD Bias generation, the
LED driver utilizes an external N-Channel
MOSFET in order to maintain maximum
efficiency along with flexible power
requirements..
The LX1745鈥檚 control circuitry is
optimized for portable systems with a
shutdown current of less than 1碌A(chǔ). The
input voltage range of 1.6V to 6.0 allows
for a wide selection of system battery
voltages
and
start-up
is
guaranteed at a V
IN
equal to 1.6V with
sustained operation as low as 1.1V.
The maximum LED drive current is
easily programmed using one external
current sense resistor in series with the
LEDs. In this configuration, LED current
provides a feedback signal to the FB pin,
maintaining constant current regardless of
varying LED forward voltage (V
F
).
Depending on the MOSFET selected, the
LX1745 is capable of achieving an LED
drive in excess of 1.0W.
The LX1745 provides simple dynamic
adjustment of the LED drive current (0% to
100% full range dimming) and the LCD
Bias output voltages (up to
鹵15%
typ)
through separate IC interfaces.
Each
interface has an internal RC filter allowing
designers to make these adjustments via a
direct PWM input signal or an analog
reference signal.
Further, any PWM
amplitude is easily accommodated using a
single external resistor.
The LX1745 is available in the low-
profile 20-Pin TSSOP.
KEY FEATURES
> 90% Maximum Efficiency
Low Quiescent Supply Current
Externally Programmable Peak
Inductor Current Limit For
Maximum Efficiency
Logic Controlled Shutdown
< 1碌A(chǔ) Shutdown Current
Dynamic Output LED Current
and Two LCD Bias Voltage
Adjustments Via Analog
Reference Or Direct PWM
Input
20-Pin TSSOP Package
APPLICATIONS
WWW .
Microsemi
.C
OM
Pagers
Smart 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
L
1
I
LED
= 20mA to 0mA
C
1
4.7碌F
V
BAT
= 1.6V to 6.0V
- V
LCD
47碌H
1206 Case Size
DRV
IN
SRC
V
LCD1
= V
IN
to 25V
SW1
OVP
LFB
FB1
CS
LX1745
LSHDN
SW2
REF
FB2
GND
SHDN1
ADJ1
ADJ2
BRT
ON OFF
R
SET
15鈩?/div>
ON OFF
V
LCD2
= V
IN
to 25V
SHDN2
ON OFF
LX1745 Evaluation Board
LX1745
LX1745
PACKAGE ORDER INFO
T
A
(擄C)
-40 to 85
PW
20-Pin
Plastic TSSOP
LX1745-CPW
Note: Available in Tape & Reel.
Append the letter 鈥淭鈥?to the part number.
(i.e. LX1745-CPWT)
Copyright
錚?/div>
2000
Rev. 1.1a, 2004-02-06
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1

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