Flash LED Drivers from Diodes Incorporated Deliver High-Current Stability in Portable Devices for Dual- & Quad-Channel Applic...
September 19 2019 - 9:00AM
Business Wire
Diodes Incorporated (Nasdaq: DIOD) today announced the AL3644, a
high-speed, dual-channel flash LED driver designed to support
advanced camera flash and torch functionality, as offered by the
latest smartphones and other portable consumer devices. Key
features include independently controlled output currents
configured through an I2C-compatible interface and the ability to
combine two devices (with different device identification
addresses) to drive four LEDs up to 6A for quad-channel
applications. The AL3644 is offered in chip-scale packaging and
combines flexible switching-frequency capabilities with constant
output current.
The AL3644 employs a constant-frequency, synchronous-boost,
current-mode PWM converter to deliver up to 1.5A for each of the
two constant current sources across its 2.5V to 5V input voltage
range. The I2C-compatible interface, operating at up to 400kHz, is
used to configure the device to deliver a constant current at one
of 128 levels between 1.4mA and 1.5A. The ratio between the two
outputs is also adjustable through the I2C-compatible
interface.
With the increasing trend towards portable and wearable devices
that offer sophisticated camera functionality, including video,
along with the convenience of a torch, the demand for highly
flexible LED drivers is increasing. The AL3644 meets this need by
offering dual, parallel current sources at efficiencies over 85% in
both torch mode and flash mode.
Two switching-frequency options, 2MHz and 4MHz, are provided,
giving engineers greater flexibility while simplifying the overall
design. The higher switching frequency also allows smaller passive
components to be used, such as low-profile inductors and small 10μF
ceramic capacitors, reducing the overall bill of materials.
As well as being the first LED driver from Diodes Incorporated
to feature an I2C-compatible interface, the AL3644 also integrates
a comparator that can be used with an external NTC to detect
thermal variations. An input voltage monitor ensures the output
current remains stable if, for example, the input voltage level
drops as the device’s battery supply falls. Fault status bits,
interrogated over the I2C-compatible interface, provide a host
controller with operational data, such as flash current time-out,
LED overtemperature, LED open/short failure, thermal shutdown, and
input undervoltage.
The AL3644 and AL3644TT (signifying different device
identification addresses) are available in low torch current and
high torch current variants in a U-WLB1713-12 package measuring
1.75mm × 1.35mm.
Further information is available at www.diodes.com.
About Diodes Incorporated
Diodes Incorporated (Nasdaq: DIOD), a Standard and Poor’s
SmallCap 600 and Russell 3000 Index company, is a leading global
manufacturer and supplier of high-quality application specific
standard products within the broad discrete, logic, analog and
mixed-signal semiconductor markets. Diodes serves the consumer
electronics, computing, communications, industrial, and automotive
markets. Diodes’ products include diodes, rectifiers, transistors,
MOSFETs, protection devices, function-specific arrays, single gate
logic, amplifiers and comparators, Hall-effect and temperature
sensors, power management devices, including LED drivers, AC-DC
converters and controllers, DC-DC switching and linear voltage
regulators, and voltage references along with special function
devices, such as USB power switches, load switches, voltage
supervisors, and motor controllers. Diodes also has timing,
connectivity, switching, and signal integrity solutions for
high-speed signals. Diodes’ corporate headquarters and Americas’
sales office are located in Plano, Texas and Milpitas, California.
Design, marketing, and engineering centers are located in Plano;
Milpitas; Taipei, Taiwan; Taoyuan City, Taiwan; Zhubei City,
Taiwan; Manchester, England; and Neuhaus, Germany. Diodes’ wafer
fabrication facilities are located in Manchester and Greenock, UK,
and Shanghai, China. Diodes has assembly and test facilities
located in Shanghai, Jinan, Chengdu, and Yangzhou, China, as well
as in Hong Kong, Neuhaus and Taipei. Additional engineering, sales,
warehouse, and logistics offices are located in Taipei; Hong Kong;
Manchester; Shanghai; Shenzhen, China; Seongnam-si, South Korea;
and Munich, Germany, with support offices throughout the world.
Recent news releases, annual reports and SEC filings are
available at the Company’s website: http://www.diodes.com. Written
requests may be sent directly to the Company, or they may be
e-mailed to: diodes-fin@diodes.com.
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version on businesswire.com: https://www.businesswire.com/news/home/20190919005178/en/
Company Contact: Diodes Incorporated Emily Yang VP,
Worldwide Sales and Marketing P: 972-987-3900 E:
pressinquiries@diodes.com
Investor Relations Contact: Shelton Group Leanne K.
Sievers EVP, Investor Relations P: 949-224-3874 E:
lsievers@sheltongroup.com
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