TI Creates Smallest Two-Bank, Low Dropout Regulator for LEDs

Texas Instruments Incorporated (TI) (NYSE: TXN) 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 color backlighting from a tiny 1.2 mm x 1.2 mm package, allowing end-users to experience blinking and dimming of color 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 25 mA (max). Each bank features independent pulse width modulation (PWM) brightness control that controls the dimming level from “full brightness” to “off.”

Key Features:

  • Regulated output current with two percent LED-to-LED matching
  • 28-mV typical dropout voltage extends usable supply range in Li-Ion battery applications
  • No internal switching signals, eliminating electromagnetic interface (EMI)
  • Over-current and over-temperature protection
  • Default LED current eliminates external components

Pricing and Availability
The TPS75105 LED driver, as well as a TPS75103 version that supports 3-mA, are available today in volume production from TI and its worldwide network of distributors. Both LED drivers come in an ultra-small, 9-ball, 0.4 mm ball-pitch wafer chip-scale package (WCSP). Suggested resale price starts at $0.65 in 1,000-unit quantities. Evaluation modules, reference designs and application notes are available for download.

Lighting and Display Solutions
TI provides the broadest portfolio of high-performance products for today’s LED design requirements, including power management, such as AC/DC, power factor correction, DC/DC and linear power conversion; RF transceivers; digital signal processors (DSPs); and ultra-low-power MCUs. TI’s products support applications ranging from ultra-small portable displays to the largest lighting and display panels in the industry. And, TI’s local support and applications expertise help designers get to market faster.