Product category:
Power Supply ICs and Controllers
News Release from: Vishay Siliconix | Subject: SiP12401 and SiP12501
Edited by the Electronicstalk Editorial
Team on 23 June 2005
White LED drivers boost efficiency
Two new white LED drivers deliver high efficiency up to 80% during operation in compact handheld and battery-operated electronics.
Vishay Intertechnology has released two new white LED drivers that deliver high efficiency up to 80% during operation in compact handheld and battery-operated electronics The new SiP12401 boost controller and SiP12501 boost convertor are optimised to provide efficient, controlled brightness in applications including white LED backlighting for LCD displays in portable electronics such as cellphones and digital cameras
This article was originally published on Electronicstalk on 17 Jun 2003 at 8.00am (UK)
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The SiP12401 boost controller IC uses double-cell NiMH or alkaline and Li-ion batteries to drive white LEDs connected in series for uniformly bright backlighting without the need for ballast resistors.
It supports an input voltage range of 1.8 to 5.0V.
Designed to drive white LEDs connected in parallel, the SiP12501 is a boost convertor IC for single- or double-cell NiMH or alkaline battery packs.
An internal low-threshold power MOSFET allows the device to start up with a low battery voltage of 0.65V.
The SiP12501 accepts input voltages from 0.65 to 3.3V and regulates an output current up to 60mA from a 0.9-V input.
The performance of the convertor is enhanced through thermal shutdown protection and antiringing control that minimises EMI.
Both devices feature a voltage-mode PWM design with internal frequency compensation to help reduce overall component count and enable design of smaller, lighter end products.
For prolonged battery life, operation in PWM mode with 600kHz switching yields high typical efficiency of 80 and 75%, respectively, for the SiP12401 and SiP12501.
The LED current may be adjusted externally for analogue control over intensity.
Logic-controlled shutdown is provided with just 1uA of standby current.
The two new LED drivers are available in a lead (Pb)-free, 6-pin PowerPAK MLP33 package and are rated for operation over the industrial temperature range of -40 to +85C.
Samples and production quantities of the new SiP12401 and SiP12501 are available now, with lead times of six to eight weeks for larger orders.
Pricing for US delivery in 1000-piece quantities is $0.60 for the SiP12401 and $0.65 for the SiP12501.
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