LM3570 is a parallel white LED driver capable of running directly off of a lithium-ion battery. The LM3570 has three parallel white-led drivers and a regulated VOUT pin (4.35V) capable of driving keypad or caller id display (CLI) diodes through the use of ballast resistors. The LM3570 evaluation board has a chip enable pin (active high logic) as well as a PWM (active high logic) pin which allows current sources to be turned on and off without completely disabling the part..The LM3570 is capable of supplying up to 80mA of current split between the regulated current sources and VOUT. The LM3570 comes in National’s LLP-14 package.
