Editor's Note: Texas Instruments (TI) announces the industry's smallest dual-group low-dropout (LDO) regulator to support light-emitting diode (LED) illumination in a variety of portable applications, including mobile phones, navigation systems, MP3 and media playback And so on. The device's high-quality color background illumination is available in a tiny 1.2 mm x 1.2 mm package that allows end users to experience the brightness and brightness of the color keypad and navigation pad backlights. ![]()
The TPS75105 linear 4-channel LDO features a constant current source that matches the LEDs and can drive up to four LEDs (two LEDs in a group), each with a constant current of 25mA (max). Each group features Pulse Width Modulation (PWM) brightness control to adjust the brightness from off to full brightness. Key features: 2% LED to LED matched regulated output current; in lithium-ion battery applications, 28mV typical voltage drop voltage extends the available supply range; no internal switching signal is required - EMI is eliminated; overcurrent and overtemperature protection; The default LED current saves external components. Both the TPS75105 and TPS75103 LED drivers support 3mA power, both of which are in volume production and can be ordered through TI and its worldwide network of distributors. Both LED drivers are available in an ultra-small 9-bump 0.4 mm solder ball pitch chip scale package (WCSP). The recommended retail price is only $0.65 in quantities of 1,000.
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