Semtech Debuts Software Controllable Octal LED Driver for Portable Devices
03 Abril 2007 - 7:00AM
Business Wire
Semtech Corp. (Nasdaq: SMTC), a leading supplier of analog and
mixed-signal semiconductors for communications, portable devices,
computers, and industrial equipment, today announced the SC620, an
octal, I2C-controlled LED driver. The SC620 is designed to provide
regulated currents for powering a wide range of LEDs, including
white, red, blue, green or yellow, with different forward voltages.
The SC620 is designed to drive the LED backlights for small to
medium size LCDs in portable systems that use rechargeable lithium
ion/polymer batteries, but may also be applied in systems with a
fixed 5V or 3.3V bus. Its low 150mV current sink dropout voltage
makes it especially suited for use with LEDs that have forward
voltages that are less than the system supply voltage. All LEDs are
connected in parallel, with power coming from the system battery or
available power rail and each cathode connected to an independent
current sink. Up to eight parallel LEDs, or strings of LEDs, can be
driven at one time, and each string can be enabled/disabled or
dimmed independently using the I2C control bus. Multiple SC620
devices can be connected to the same I2C bus to provide
synchronized control of large banks of LEDs. Each current sink may
also be used as an addressable general-purpose output, to enable
multiple devices or functions remotely using only the two lines for
the I2C interface. The current sinks are very accurate and exhibit
close matching when programmed for the same current, making them
ideal for LCD backlighting applications. The current setting range
allows dimming ratios up to 800:1, excellent for LCD panels that
are exposed to varying ambient light conditions. The flexibility to
select the power source for driving the loads allows for a lower
cost solution, or lets the designer select an available source that
maximizes efficiency for a particular application. An enable pin
allows the system designer to set the part into an ultra-low power
shutdown state where the LEDs are disconnected, preventing residual
glow due to leakage. The SC620 input voltage range is 2.7V to 5.5V.
The maximum total output current capability is 200mA. In a typical
application (VBATT=3.6V typ.), eight white LEDs (Vf = 3.4V) can be
driven at 25mA each (full brightness) with 92 percent efficiency.
�The versatility of this device allows full brightness control to
be easily obtained using a reliable two-wire serial interface, only
one external component, and an industry proven LED current control
topology,� said Karl Volk, Director of Marketing for Semtech�s
Portable Power Management Products Group. �Additional space savings
can be accomplished for those who use any remaining SC620 outputs
as general purpose controls to power additional devices within the
same space-limited system.� The ultra-small SC620 features a 3mm x
3mm MLPQ-UT-16 package with a low profile of just 0.6 mm maximum -
perfect for small form factor designs. It is RoHS and WEEE
compliant. To assure safe operation across all load conditions, the
SC620 contains protection features such as short circuit current
limit, thermal protection and under-voltage lockout. Key Features
of the SC620 Eight independently controlled current sinks 150mV
maximum dropout voltage Current sinks can also be used as general
purpose outputs Very wide output current range: 31.25�A to 25mA
800:1 current dimming range Integrated I2C serial bus communication
Drives full array of LEDs, any color combination per string Low
noise solution using only one external ceramic capacitor Pricing
and Availability The SC620 is available immediately in production
quantities and is priced at $0.68 each in 1,000-piece lots.
Ordering code for the SC620 is SC620ULTRT. Semtech offers
comprehensive design assistance, including field- and factory-based
support. Data sheets, volume pricing, delivery quotes, as well as
evaluation kits and samples, are available by contacting
salesinfo@semtech.com. About Semtech Semtech Corporation is a
leading supplier of high-quality analog and mixed-signal
semiconductor products. The company is dedicated to providing
customers with proprietary solutions and breakthrough technology in
power management, protection, advanced communications, human
interface, test & measurement, and wireless connectivity
products. Publicly traded since 1967, Semtech is listed on the
NASDAQ National Market under the symbol SMTC. For more information,
contact Semtech Corp. at 200 Flynn Road, Camarillo, CA 93012-8790;
phone (805) 498-2111; email to info@semtech.com; or visit its web
site at www.semtech.com. Semtech and the Semtech logo are marks of
Semtech Corporation.
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