LDO cuts the size of handset lighting supplies

A Texas Instruments (April 2006-) product story

Edited by the Electronicstalk editorial team Nov 28, 2006

Small two-bank low-dropout regulator supports LED lighting in portable applications, such as mobile phones, navigation systems, MP3 and media players.

Texas Instruments has introduced the smallest two-bank, low dropout (LDO) regulator to support light emitting diode (LED) lighting in portable applications, such as mobile phones, navigation systems, MP3 and media players.

The device enables quality colour backlighting from a tiny 1.2 x 1.2mm package, allowing end-users to experience blinking and dimming of colour keypads and navigation pad lights.

TI's TPS75105 linear, quad-LDO with matching LED constant current source drives up to four LEDs in two banks with each LED at 25mA (maximum).

Each bank features independent pulsewidth modulation (PWM) brightness control that controls the dimming level from "full brightness" to "off".

The TPS75105 LED driver, as well as a TPS75103 version that supports 3mA, are available today in volume production from TI and its worldwide network of distributors.

Both LED drivers come in an ultrasmall 9-ball 0.4mm-ball-pitch wafer chip-scale package (WCSP).

Suggested resale price starts at US $0.65 in 1000-unit quantities.