LED Charge Pump delivers up to 500 mA output current.
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Press Release Summary:
Manufactured in 3 x 3 mm, 10-lead DFN package with profile of less than 1 mm, inductorless LTC3214 features soft-start circuitry and operating efficiencies up to 94%. Fractional charge pump utilizes multi-mode architecture that automatically switches between 1x, 1.5x, or 2x boost modes, monitoring voltage across LED current source and switching modes only when ILED dropout is detected. White LED driver features 900 kHz switching frequency.
Original Press Release:
Inductorless Multi-Mode LED Charge Pump Delivers 500mA Output Current With Up to 94% Efficiency
MILPITAS, CA - August 18, 2005 - Linear Technology Corporation announces the LTC3214, a fractional charge pump, high current white LED driver that delivers up to 500mA of LED current. Its high efficiency multi-mode architecture automatically switches between 1x, 1.5x or 2x boost modes monitoring the voltage across the LED current source and switching modes only when ILED dropout is detected. This enables the LTC3214 to maximize efficiency (up to 94%) throughout the entire Li-Ion operating range. A 900kHz switching frequency and a low external parts count (two flying capacitors, two programming resistors and two bypass capacitors at VIN and CPO) provide a very tiny footprint and cost-effective solution, ideally suited for video and flash applications in camera phones and other portable lighting applications.
The LTC3214 employs built-in soft-start circuitry which prevents excessive inrush current during start-up. An ultralow dropout current source maintains accurate LED current as the input voltage approaches the LED forward voltage. The LTC3214 is available in a low profile (0.75mm), 3mm x 3mm 10-lead DFN package.
The LTC3214EDD is available from stock in a DFN-10 package. Pricing starts at $1.65 each for 1,000-piece quantities.
Summary of Features: LTC3214
High Efficiency Operation: 1x, 1.5x or 2x Boost Modes with Automatic Mode Switching
Ultralow Dropout ILED Current Control
Output Current up to 500mA
Low Noise Constant Frequency Operation
Tiny Application Circuit (All Components <1mm Profile)
3mm x 3mm 10-Lead DFN Package
Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.
LT and LTC are registered trademarks of Linear Technology Corp.
Worldwide Contacts
North America and General Information
John Hamburger
Tel: (408) 432-1900 ext. 2419
jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233
ddickinson@linear.com
China (PRC)
Fanny Lau
Tel: 852-2428-0303
flau@linear.com
Angela Ao
Tel: (8610)6522 8081
angela@eba.com.cn
Germany
Ralf Stegmann
Tel: +49 (0) 7131/9234-0
ralf@ezwire.com
Japan
Kazuto Takahashi
Tel: 81-3-5226-7291
takahashi@linear-tech.co.jp
UK & Scandinavia
Alan Timmins
Tel: +44-1-252-629937
a.timmins@ntlworld.com
Korea
Desiree Park
Tel: +82 (0) 2812 1144
desiree@ezwire.com
Taiwan
Alice Wang
Tel: + 886-2-28974705
alicesh.wang@msa.hinet.net
