Battery-friendly LED driver saves space as well

Edited by the Electronicstalk editorial team Oct 30, 2003

Otimised for constant current control, the MIC2287 is a boost-switching regulator with a feedback voltage of only 95mV which allows minimal output voltage in constant-current control applications.

Otimised for constant current control, the MIC2287 from Solid State Supplies is a boost-switching regulator with a feedback voltage of only 95mV which allows minimal output voltage in constant-current control applications, hence minimal current draw from the battery.

An example of this is the component's ability to drive a string of up to eight white/blue LEDs in series.

The MIC2287 implements a constant frequency 1.2MHz PWM control scheme and the high frequency PWM operation saves board space by reducing external component sizes.

The 1.2MHz PWM scheme also reduces spurious switching noise and ripple to the input power source.

"The 2.5 to 10V input voltage range of MIC2287 allows direct operation from one- and two-cell Li-ion as well as three- to four-cell NiCad, NiMH and alkaline batteries", says Ray Baker at Solid State.

"The battery life is aided by sub-1uA shutdown current and the device also benefits from overtemperature and overvoltage protection at 15, 24V or 34V".

Available in a low profile, thin SOT23 5-lead package and a 2 x 2mm MLF-8 leadless package, the MIC2287 has a junction temperature range of -40 to +125C.