![]() Though people call this type of driver a linear regulator, linear regulators regulate the voltage. Also, many LEDs are being overdriven by 4.2 volts of a fresh li-ion battery. If a constant brightness is desired, a driver that offers some kind of regulation is required. As voltage decreases the light will dim and draw less current. When the voltage is higher, the LED will be very bright and draw a great deal of current. As power is applied to the LED, it will draw a certain amount of current from the battery. However a fresh li-ion battery starts at 4.2 volts fully charged and will be 3.6 volts when it needs to be recharged. This is quite efficient since all of the power from the battery is delivered to the LED. Lithium-ion batteries conveniently provide a decent voltage without any further modification. If you apply the correct voltage, you don't need a driver at all. 17mm linear regulator driver wchips and microprocessor ![]()
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