LX1991
®
Six Output Programmable LED Current Sink
TM
P
RODUCTION DATA SHEET
KEY FEATURES
DESCRIPTION
LED Display Driver: This six channel
1000:1 Dimming Range: The DIG_DIM
Six precision independent
current sink channels
Simultaneous Analog and
Digital Dimming Modes
Precision programming of
current rise & fall times
1% band gap reference
40 volt rated output stages
3V / 5V logic input compatible
1.5 watt power dissipation
On-chip thermal shutdown
16 Pin 4 x 4 MLPQ Package
current sink driver is ideal for controlling input accepts a TTL or CMOS logic signal
brightness and hue of high quality that controls duty cycle of the output
dimmable LED displays. High accuracy, currents.
dual mode dimming, and controlled current
Independent Channels: The six channels
switching time provides consistent color feature independent regulation with respect
hue, at brightness ratios of up to 1000:1, to output voltage, so one does not affect the
and keeps electro magnetic emissions in others. Any one or more outputs can be left
check.
unloaded
without
affecting
current
Its wide compliance voltage range regulation of the other channels. Multiple
combined with 43 volt breakdown cap- channels can also be connected together to
ability make the LX1991 ideal for sink more current in a single load.
automotive in-dash displays.
EMI Control: Rise and fall time of sink
BENEFITS
Precision current control: Precision currents are precisely controlled by placing
current mirror circuitry sets all channels to a capacitor on the SLOPE_C pin. Special
the same current with a single programming control circuitry maintains symmetrical rise
input. Sinking current value can be pro- and fall times, preserving the LX1991’s
grammed up to 30 mA per channel with a ability to provide accurate output current
single resistor or potentiometer from ISET+ to response to very narrow input pulses on the
Consistent LED color hue
results from high current
accuracy
1000:1 dimming ratio with
digital dimming
Lowered emissions with
current slope programming
Reduced component count
for compact designs
Drive up to 108 colored
LED’s per IC (6 x 18 @ 2.1
volts)
Drive up to 60 white or blue
LED’s per IC (6 x 10 @ 3.8
volts)
ISET
. Channel to channel matching is ty- DIG_DIM pin.
-
pically within ±1 percent of channel mean
at the rated output current.
Dual Mode Dimming: Display dimming of 1.5 watts dissipation. Logic Enable: A
can be achieved by controlling either separate input puts the LX1991 to sleep at
current amplitude or duty cycle, and both less than 1 uA IDD
Power Handling: The LX1991 is
supplied in a 4x4 MLPQ package capable
.
methods can be employed at the same time.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
PRODUCT HIGHLIGHT
+36V
Bill of Materials
LX1991
54 White LED’s
5V
VF ~3.7V
1
1
1
@20mA
LX1991
SLEW CONTROL
Cap
Resistor
VDD
SINK1
SINK2
SINK3
CSLOPE
PWM
SIGNAL
54
57
White LEDs
Total Count
DIG_DIM
ENA
LX1991
ON
SINK4
SINK5
OFF
ISET+
ISET-
SINK6
GND
1.5K
PACKAGE ORDER INFO
Plastic 4x4 MLPQ
M
IN VDD
M
AX VDD
TJ (°C)
-40 to 85
LQ 16-PIN
RoHS Compliant / Pb-free Transition DC: 0436
4.5
5.5V
LX1991ILQ
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1991ILQ-TR)
Copyright © 2001
Rev. 1.0, 5/18/2005
Microsemi
Integrated Products
Page 1
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
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