LX1990ILM

LX1990ILM Datasheet

LX1990

Part	Datasheet
LX1990ILM	LX1990ILM (pdf)

PDF Datasheet Preview
W.Microsemi .C O M INTEGRATED PRODUCTS LX1990 Dual Programmable LED Current Sink The LX1990 is a dual output current Light output from LED’s is proportional sink optimized for driving light emitting to average current through them they can diodes. This low cost bipolar IC enables easily produce a brightness range of precise current regulation in LED However, color of emitted light is shifted display lighting applications, yet by current amplitude. Color shift at low requires far fewer parts than discrete light levels can be reduced by driving the solutions. The LX1990 is supplied in a LED’s with a constant peak current while micro-miniature 6 lead MLP package dimming with duty cycle control. featuring a 3 x 3 mm footprint, a profile This is achieved by driving the ISET of less than 1mm, and much improved resistor with a PWM signal. A 500:1 thermal performance. Its two output sink brightness range can be achieved by currents are accurately matched and choosing 270 Hz as the PWM frequency to require only one resistor to program. avoid optical beating with 50/60 Hz room Program current is only 1% of the lights and pulse width from output currents, and quiescent current is milliseconds to microseconds. low, providing a very high efficiency The LX1990 features a shutdown mode driver for battery-powered displays. via the Enable pin. In this mode the The LX1990 is based on a current- LX1990 consumes less than 1µA and holds mirror architecture that transfers a the two open collector output stages off. reference current produced at the ISET This pin may also be used to pulse width pin to each of two open-collector current modulate output current. See applications sinking outputs. The output stages section for dimming details. multiply this reference current by 100 to sink independently regulated currents up to 30 mA. IMPORTANT For the most current data, consult MICROSEMI’s website: PRODUCT HIGHLIGHT KEY FEATURES • Programmable Sink Current to 30mA x 2 Channels • Replaces Discrete Transistor Circuitry With A Single Package • 300mV Maximum Current Sink Dropout Voltage at 20mA • to 5.5V Power Supply Input • IOUT Compliance Voltage from to 10VDC • Enable Input With <1µA Sleep Current • Amplitude and PWM Dimming • Current rise and fall time may be controlled to reduce EMI • Cell Phone Display Illumination • PDA White LED Display

PDF Datasheet Preview

W.Microsemi .C O M

INTEGRATED PRODUCTS

LX1990

Dual Programmable LED Current Sink

The LX1990 is a dual output current Light output from LED’s is proportional
sink optimized for driving light emitting to average current through them they can
diodes. This low cost bipolar IC enables easily produce a brightness range of
precise current regulation in LED However, color of emitted light is shifted
display lighting applications, yet by current amplitude. Color shift at low
requires far fewer parts than discrete light levels can be reduced by driving the
solutions. The LX1990 is supplied in a LED’s with a constant peak current while
micro-miniature 6 lead MLP package dimming with duty cycle control.
featuring a 3 x 3 mm footprint, a profile This is achieved by driving the ISET
of less than 1mm, and much improved resistor with a PWM signal. A 500:1
thermal performance. Its two output sink brightness range can be achieved by
currents are accurately matched and choosing 270 Hz as the PWM frequency to
require only one resistor to program. avoid optical beating with 50/60 Hz room

Program current is only 1% of the lights and pulse width from
output currents, and quiescent current is milliseconds to microseconds.
low, providing a very high efficiency The LX1990 features a shutdown mode
driver for battery-powered displays.
via the Enable pin. In this mode the

The LX1990 is based on a current- LX1990 consumes less than 1µA and holds
mirror architecture that transfers a the two open collector output stages off.
reference current produced at the ISET This pin may also be used to pulse width
pin to each of two open-collector current modulate output current. See applications
sinking outputs. The output stages section for dimming details.
multiply this reference current by 100 to
sink independently regulated currents up
to 30 mA.

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

PRODUCT HIGHLIGHT

KEY FEATURES
• Programmable Sink Current to 30mA x 2 Channels
• Replaces Discrete Transistor Circuitry With A Single Package
• 300mV Maximum Current Sink Dropout Voltage at 20mA
• to 5.5V Power Supply Input
• IOUT Compliance Voltage from
to 10VDC
• Enable Input With <1µA Sleep

Current
• Amplitude and PWM Dimming
• Current rise and fall time may
be controlled to reduce EMI
• Cell Phone Display Illumination
• PDA White LED Display

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Datasheet ID: LX1990ILM 649016