LX1991ILQ

LX1991ILQ Datasheet

LX1991

Part	Datasheet
LX1991ILQ	LX1991ILQ (pdf)

PDF Datasheet Preview
.COM LX1991 Six Output Programmable LED Current Sink PRODUCTION DATA SHEET LED Display Driver This six channel current sink driver is ideal for controlling brightness and hue of high quality dimmable LED displays. High accuracy, dual mode dimming, and controlled current switching time provides consistent color hue, at brightness ratios of up to 1000:1, and keeps electro magnetic emissions in check. Its wide compliance voltage range combined with 43 volt breakdown capability make the LX1991 ideal for automotive in-dash displays. Precision current control Precision current mirror circuitry sets all channels to the same current with a single programming input. Sinking current value can be programmed up to 30 mA per channel with a single resistor or potentiometer from ISET+ to ISET-. Channel to channel matching is typically within ±1 percent of channel mean at the rated output current. Dual Mode Dimming Display dimming can be achieved by controlling either current amplitude or duty cycle, and both methods can be employed at the same time. 1000:1 Dimming Range The DIG_DIM input accepts a TTL or CMOS logic signal that controls duty cycle of the output currents. Independent Channels The six channels feature independent regulation with respect to output voltage, so one does not affect the others. Any one or more outputs can be left unloaded without affecting current regulation of the other channels. Multiple channels can also be connected together to sink more current in a single load. EMI Control Rise and fall time of sink currents are precisely controlled by placing a capacitor on the SLOPE_C pin. Special control circuitry maintains symmetrical rise and fall times, preserving the LX1991’s ability to provide accurate output current response to very narrow input pulses on the DIG_DIM pin. Power Handling The LX1991 is supplied in a 4x4 MLPQ package capable of watts dissipation. Logic Enable A separate input puts the LX1991 to sleep at less than 1 uA IDD. IMPORTANT For the most current data, consult MICROSEMI’s website: KEY FEATURES 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 watt power dissipation On-chip thermal shutdown 16 Pin 4 x 4 MLPQ Package 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 volts Drive up to 60 white or blue LED’s per IC 6 x 10 volts PRODUCT HIGHLIGHT PWM SIGNAL SLEW CONTROL ON OFF 1.5K LX1991 VDD SINK1 CSLOPE SINK2 DIG_DIM SINK3 LX1991 SINK4 ISET+ ISET- SINK5 SINK6 GND +36V 54 White LED’s VF ~3.7V Bill of Materials

PDF Datasheet Preview

.COM

LX1991

Six Output Programmable LED Current Sink

PRODUCTION DATA SHEET

LED Display Driver This six channel current sink driver is ideal for controlling brightness and hue of high quality dimmable LED displays. High accuracy, dual mode dimming, and controlled current switching time provides consistent color hue, at brightness ratios of up to 1000:1, and keeps electro magnetic emissions in check.

Its wide compliance voltage range combined with 43 volt breakdown capability make the LX1991 ideal for automotive in-dash displays.

Precision current control Precision current mirror circuitry sets all channels to the same current with a single programming input. Sinking current value can be programmed up to 30 mA per channel with a single resistor or potentiometer from ISET+ to ISET-. Channel to channel matching is typically within ±1 percent of channel mean at the rated output current.

Dual Mode Dimming Display dimming can be achieved by controlling either current amplitude or duty cycle, and both methods can be employed at the same time.
1000:1 Dimming Range The DIG_DIM input accepts a TTL or CMOS logic signal that controls duty cycle of the output currents.

Independent Channels The six channels feature independent regulation with respect to output voltage, so one does not affect the others. Any one or more outputs can be left unloaded without affecting current regulation of the other channels. Multiple channels can also be connected together to sink more current in a single load.

EMI Control Rise and fall time of sink currents are precisely controlled by placing a capacitor on the SLOPE_C pin. Special control circuitry maintains symmetrical rise and fall times, preserving the LX1991’s ability to provide accurate output current response to very narrow input pulses on the DIG_DIM pin.

Power Handling The LX1991 is supplied in a 4x4 MLPQ package capable of watts dissipation. Logic Enable A separate input puts the LX1991 to sleep at less than 1 uA IDD.

IMPORTANT For the most current data, consult MICROSEMI’s website:

KEY FEATURES

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 watt power dissipation On-chip thermal shutdown 16 Pin 4 x 4 MLPQ Package

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 volts

Drive up to 60 white or blue LED’s per IC 6 x 10 volts

PRODUCT HIGHLIGHT

PWM SIGNAL

SLEW CONTROL

ON OFF
1.5K

LX1991

VDD SINK1

CSLOPE SINK2

DIG_DIM SINK3

LX1991

SINK4

ISET+ ISET-

SINK5

SINK6 GND
+36V
54 White LED’s VF ~3.7V

Bill of Materials

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived LX1991ILQ Datasheet file may be downloaded here without warranties.

Datasheet ID: LX1991ILQ 649017