The MIC2297 is a 600kHz PWM boost-switching regulator that is optimized for driving 6-10 series white LEDs. With its internal 40V switch and a guaranteed switch current of 1.2A, the MIC2297 easily drives a string of 10 white LEDs in series at 20mA, ensuring a high level of brightness and eliminating several ballast resistors.

The MIC2297 implements constant frequency 600kHz PWM control. The high frequency PWM operation saves board space by reducing external component sizes. The added benefit of the constant frequency PWM operation is much lower noise and input ripple injected back to the battery source than with variable frequency topologies.

To optimize efficiency, the feedback voltage is set to 200mV. This reduced voltage reduces the power dissipation in the current set resistor, and allows the lowest total output voltage, hence minimal current draw from the battery.

The MIC2297 is available with output over voltage protection that protects the IC and external components in case of open LED conditions.

The MIC2297 is available in low profile small size 2.5mm x 2.5mm MLF®-10L package. The MIC2297 has a junction temperature range of -40°C to +125°C.

  2.5V to 10V input voltage range

  Output voltage up to 40V

  1.2A switch current

  600kHz PWM operation

  Trimmed 200mV feedback voltage

  Output over voltage protection (fixed or adjustable)

  PWM brightness control

  DAC brightness control

  <1% line regulation

  1µA shutdown current

  Over temperature protection

  UVLO

  10-pin 2.5mm x 2.5mm MLF®package

  -40 °C to +125 °C junction temperature range