Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3230
Edited by the Electronicstalk Editorial
Team on 23 January 2008
Driver handles two displays with power
to spare
White LED driver incorporates dual LDO regulators for driving main and subsidiary LED displays and supplying low-voltage system rails.
The LTC3230 from Linear Technology is an integrated white LED driver with dual LDO regulators for driving main and subsidiary LED displays and supplying low-voltage system rails in portable electronic devices, all in a compact 3 x 3mm QFN package The LTC3230 drives up to five 25mA LED current sources, providing 125mA of total output current, and integrates two 200mA LDOs with separate enables and pin-selectable output voltages as low as 1.2 and 1.8V, respectively
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The LTC3230's 2.7 to 5.5V input voltage range has been optimised for single cell Li-ion/polymer applications.
Efficiencies when driven from a Li-ion battery (3.6V nominal) reach 91% with quiescent current of only 400uA, maximising battery runtime.
The LTC3230 requires only six small capacitors and one resistor to create a tiny-footprint low-profile (less then 9mm2 package area, 0.75mm high) power system.
The LTC3230's 900kHz high-efficiency multimode 1x/1.5x/2x charge pump features low-noise constant-frequency operation and automatically optimises efficiency based on input-voltage and LED forward voltage conditions.
The device powers up in 1x mode and automatically switches to boost mode (1.5x) when any enabled LED current source approaches dropout.
A subsequent dropout switches the part into 2x mode.
Maximum currents for the main and subsidiary displays are set with a single resistor.
LED currents are controlled with precision internal current sources and brightness, dimming and on/off control for all displays are achieved via a simple single-wire interface.
The LTC3230 provides 32 brightness levels for both the main and subsidiary displays.
Internal circuitry prevents inrush current and excessive input noise during startup and mode switching.
In addition, the device has thermal limit and open/short LED protection.
The LTC3230 is available from stock in a 20-lead QFN (3 x 3mm) package.
Pricing starts at US $1.55 each for 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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